Xiaoyu Environmental Protection Co., Ltd. devotes itself to the supply of buried integrated wastewater treatment equipment for many years of production and processing. We have always taken quality as our priority, reputation as the most important, service as our sincere, streamlined production, and the price is closer to the people. Our installation team has spread all over the country and we have no worries. Xiao Yu Environmental protection is trustworthy, because there is Xiaoyu so everything will be even better! ! ! More information welcome to inquire 24-hour customer service hotline.
Xiaoyu Environmental Services:
â—‡ Stand in the position of the customer (or consumer) rather than stand in the company's position to research, design, and improve services.
â—‡ Improve the service system, strengthen pre-sales, sales, and after-sales services, and promptly help solve various problems in the use of products by customers, so that customers feel great convenience.
â—‡ highly value customer opinions, allow customers to participate in decision-making, and treat customers' opinions as an important part of customer satisfaction.
Energy-saving approaches for various treatment structures 1. Wastewater lifting pump room Sewage lifting pump room should save energy consumption. The main consideration is to consider how the sewage lifting pump can save electric energy. The correct and scientific selection of the pump is the effective means for the pump to work in the efficient section. Buried integrated wastewater treatment equipment rationally uses the terrain. It is also an effective method to reduce the lifting height of the sewage to reduce the shaft power of the pump. Regular maintenance of the pump can reduce the power consumption.
2. The grit chamber adopts advection grit. It avoids the use of grit chambers that require power equipment. Buried integrated wastewater treatment equipment such as advective grit chambers. Gravity sand expulsion. Avoid mechanical sand removal. These measures can be greatly Save energy.
3. Initial sedimentation tank The initial sedimentation tank has a low energy consumption. The main energy consumption is on the mud discharge equipment. Using hydrostatic pressure method will undoubtedly reduce the energy consumption.
4. The energy consumption of biological treatment aeration systems is quite large. Research on energy efficiency of aeration systems always involves the transformation and innovation of aeration equipment. Although new types of aeration equipment are emerging in an endless stream, they can still be divided into 2 categories. : The first is the use of submerged porous diffuser heads or air nozzles to produce air bubbles that transfer oxygen into the aqueous solution. The second is a method of mechanically agitating the wastewater to promote the dissolution of oxygen in the atmosphere. Sewage treatment equipment micropore aeration. Aeration diffuser layout and adjustment of the aeration system These are effective measures to save energy. In the traditional activated sludge treatment plant aeration tank to create front-end anaerobic zone. With submerged Blender energy-saving and biological phosphorus removal program. This simple modification can save nearly 20% of the aeration energy consumption. If you count the energy mix, the integrated underground sewage treatment equipment can save energy by 12%. Automatic control The system's application in wastewater treatment is energy-saving. The aeration system performs stage aeration. There is a concentration gradient of dissolved oxygen, which reduces energy consumption. It can also improve the treatment effect and reduce the amount of sludge. The biofilm treatment process can be obviously treated with anaerobic treatment. Reduce energy consumption.
5. The study of mud discharge equipment in the secondary sedimentation tank and the improvement of sludge discharge method are effective methods to reduce energy consumption.
6. Sludge treatment Underground integrated sewage treatment equipment Sludge treatment system Energy-saving research mainly focuses on the energy recovery of sludge treatment. Energy recovery from organic pollutants in sewage sludge is used in the treatment process as early as the beginning of the last century. Put into practice. But before the energy crisis has been ignored. There are two ways to recover: First, sludge anaerobic digestion gas utilization. First, the use of sludge incineration heat.
Digestive gas is stable in nature and easy to store. It can be converted into mechanical energy or electric energy through internal combustion engines or fuel cells. Waste heat can also be recovered in digested sludge for heating. Therefore, the use of digested gas can solve different levels of energy self-sufficiency in sewage treatment plants. Compare biogas generators The two types of utilization of fuel cells are considered. The fuel cells have a high energy utilization rate. They have a good future for development. The maximum utilization of digestive gas is the main way to improve energy efficiency. The research and application of biogas generators in grid-connected power generation has been applied in China. There are application examples. It is a feasible way for the comprehensive utilization of biogas in large-scale sewage treatment plants. Another way of energy recovery is to build the municipal solid waste incineration plant beside the sewage treatment plant. Burn solid waste together with sewage sludge. For the operation of the plant.
Electrical control description and working principle The electrical control system of the equipment adopts PLC programmable logic controller to achieve automatic control to realize modern equipment management, and set manual and automatic conversion control. There are multiple groups of automatic alarm and interlock functions.
(A) The liquid level control function sets three float level controllers in the adjusting tank respectively: it shows the status of the three liquid levels in the adjusting tank.
1. Low level control float:
When adjusting the liquid level in the tank to the minimum liquid level, the floating ball control contact is disconnected, and the buried integrated sewage treatment equipment automatically stops the sewage pump to avoid damaging the submersible sewage pump due to the evacuation of the sewage in the regulating tank, and when adjusting the inside of the tank When the liquid level is higher than the minimum level, the float control contact is turned on, and the sewage pump can start. (The original design minimum level was -3.45m)
2. Normal level control float:
Only when the normal liquid level control ball float control contact is turned on, the automatic control can be enabled for the first time and then run according to the programmed procedure. When the normal liquid level control float ball control contact is disconnected, the PLC programmable controller can be used. Can not start, buried integrated sewage treatment equipment in the first start-up operation, the normal liquid level control float ball control contact must be in the ON state, PLC can automatically run.
3. High level control float:
When the water level in the adjustment tank exceeds the maximum level, the control point for the high-level control float ball is turned on to provide an alarm, prompting to intensify the treatment of the sewage.
(B) Programmable Controller Operation Procedure 1. Turn on the power and enter the automatic operation state.
2. At this time, one pump and one fan start running. After 8 hours of continuous operation of the fan, the pump is alternately running for 4 hours. If the level in the adjustment tank reaches the low level, it will automatically stop and start automatically. Another pump and fan are running. If the liquid level in the adjustment tank is still higher than the low level, it will automatically switch to the previous set of pumps and fans. In order to alternate operation.
3. If the adjustment tank liquid level is lower than the minimum level, the low level control float ball contact action is disconnected, a group of pumps and fans automatically stop, when the stop time exceeds 2 hours, that is, the water level is still at the lowest level At the time, the buried integrated sewage treatment equipment fan will automatically start running for 0.5 hours. After 0.5 hours, the fan will automatically stop. If the low level control float ball control contact is still turned on, the fan will run for 0.5 hours after 2 hours.
4. If the low level control float control contact is turned on and the liquid level is higher than the minimum water level, go to step 2 and the buried level integrated wastewater treatment equipment low level control float ball control contact is disconnected, ie the liquid level Below the minimum level, go to step 3 for work.
Note: The PLC programmable logic controller has been prepared by the electrical engineer of our company. The user cannot modify it by themselves. The manual operation control refers to the automatic operation.
Pipeline pressure test and flushing air pipes are tested for strength and tightness according to design requirements, and other pipelines are pressure tested.
1) Pipeline pressure test (1) Steel pipe pressure test 1 According to the different media (air, sludge, and water) transported by the pipeline, the test pressure of the various pipelines is different, and the test medium used is different.
2 All kinds of pipeline test operation method refers to "Code for construction and acceptance of industrial metal pipeline engineering" GB50235-97. The water pressure test uses the temporary water supply in the plant; the air pressure test uses the air compressor to supply air.
(2) UPVC pipe test pressure 1 Preparation A. UPVC pipe joints Consolidation protection: When the pipe section pressure test, the elbow and joints are consolidated to prevent them from moving after pressure test.
B. Carefully inspect the appearance of pipelines, nodes, interfaces, support piers and other ancillary structures, and check whether the pipeline can be properly vented and drained according to the design of the water level meter.
C. Inspect equipment such as pressure test equipment, pressure gauges, bleed air pipes, and water intake pipes, and check the tightness and function of the pressure test system of the buried integrated sewage treatment equipment. At the same time, the firmness of the support at the end of the pipe, elbows and tees is carefully checked.
2 Test A. Slowly inject water into the pressure test tube while draining the air inside the tube. After the pipe is filled with water, keep it for at least 12 hours without pressure.
B. Conduct pipe tightness test, pressurize the water in the pipe to 0.35MPa, and keep it for 2h. Buried integrated wastewater treatment equipment checks for leaks or other abnormalities at various locations. In order to maintain the pressure inside the tube, water can be supplied to the tube.
C. After the rigorous test passes the strength test, press the test pressure in the tube to maintain the test pressure for 2 hours or meet the special requirements of the design. Whenever the pressure drops 0.02 MPa, the tube is filled with water. Buried integrated wastewater treatment equipment calculates the value of water leakage by adding water to maintain the pressure in the pipe. The strength test results were judged based on the presence or absence of abnormalities and water leakage. The allowable seepage volume is shown in Table 5.1.5 of "CECS18:90".
D. After the test, release the water in the pipeline.
E. Hydraulic pressure test meets the following requirements:
a. Tightness test. In the tightness test, if there is no leakage in 2h, it is qualified.
b. Strength test. In the strength test, if the amount of water leakage does not exceed the specified allowable value, the test tube section is subjected to the strength test.
Leakage per tube segment (L/min): 0.2 to 0.24
F. Observe the following rules when pressure testing:
a. The pressure test can only be carried out for 48 hours after the installation of the bonded pipe.
b. The support of the three-way and elbows on the pressure test section, especially the end of the tube, must have sufficient stability. For a thrust block with a concrete structure, sufficient solidification time is required before the test to achieve a rated compressive strength.
c. During the pressure test, water is injected into the pipe and the air in the pipe is drained. The water slowly enters the pipe to prevent the occurrence of a hammer or water hammer.
2) Pipeline flushing (1) After the pipeline pressure test of the water flushing pipeline is completed, the pipeline flushing is performed before the completion acceptance. When rinsing, continuously rinse with flushing water with a flow rate of not less than 1.0m/s until the turbidity and chroma at the outlet are the same as the turbidity and chroma of the flushing water at the inlet.
(2) After the tightness and strength test of the gas flushing pipeline is qualified, the pipeline is flushed. Purge wind speed and standards are in accordance with the installation technical documents. When blowing, please ask Party A to do covert inspection. After passing inspection, protect it and prevent debris from entering the pipe.
Sewage treatment process description The buried integrated wastewater treatment facility adopts the AO integrated wastewater treatment facility, which is based on Party A's procurement. This project is only used as a basis for investment control.
Grid machine: Remove grease and other solids from the water to ensure the quality of integrated raw water.
Acidification conditioning tank: converts macromolecules into small molecules, converts the cyclic structure into a chain structure, reduces the chromaticity of the wastewater, and further increases the BOD/COD ratio of the wastewater to increase the biodegradability of the wastewater, creating a follow-up process good environment.
Contact tank and oxidation tank: Oxygenation is characterized by the setting of packing material in the aeration tank to cut small molecules. The bottom aeration oxygenates the sewage and makes the sewage in the tank flow to ensure the sewage and sewage. The fillers are in full contact with the microorganisms and algae on the filler. The pollutants in the sewage are quickly and effectively degraded and the deoxidation pool is formed by setting a highly efficient ecological base and aeration system in the pool.
In the contact oxidation tank, the aeration of the bottom of the tank aerates the sewage and oxygenizes the sewage in the tank to ensure that the sewage is in full contact with the high-efficiency ecological base. This avoids the defects in the contact between the sewage and the ecological base in the biological contact oxidation tank. .
The oxygen required by the microorganisms in the contact oxidation tank is supplied by the aerator. When the biofilm grows to a certain thickness on the ecological base, the ecological-based microorganisms undergo anaerobic metabolism due to lack of oxygen, and the generated gas and aeration form a scour. The effect will cause the biofilm to fall off and promote the growth of new biofilms. At this point, the shedding biofilm will flow out of the pool with the effluent.
Contact Oxidation Tanks In the early stages of operation, a small amount of bacteria adhered to the surface of the ecological substrate, and a thin biofilm gradually formed due to bacterial growth. Under the conditions of sufficient dissolved oxygen and food, the microorganisms multiply rapidly and the biofilm gradually thickens. Dissolved oxygen and organic matter in the sewage are used by microorganisms due to diffusion. However, when the biofilm reaches a certain thickness, oxygen is no longer able to diffuse into the inner layer of the biofilm, and aerobic bacteria die. The facultative bacteria and anaerobic bacteria begin to reverse on the inner layer, forming an anaerobic layer and using the dead aerobic bacteria as Matrix, and on this basis continue to develop anaerobic bacteria. Due to this special A/O environment on the surface of the ecological base, the oxidation tank can more effectively remove the ammonia nitrogen in the sewage.
After a period of time, the number began to decline, coupled with the escape of metabolic products, causing a large amount of inner biofilm to fall off.
On the surface of the ecological substrate where the biofilm has fallen off, new biofilms have re-emerged. In the contact oxidation cell, due to the large surface area of ​​the high-efficiency ecological substrate, each stage of the biofilm development exists at the same time, so that the ability to remove organic substances is stabilized at a certain level.
The repeated operation modes of "aerobic-anoxic" and "aerobic-anaerobic" enhanced the absorption of phosphorus and nitrification-denitrification, resulting in a removal rate of nitrogen and phosphorus of more than 80%, which ensured that the effluent index was qualified.
Adding medicine disinfecting pool: In order to eliminate the virus, chlorine dioxide is used for disinfection, and the water can be discharged after being disinfected by a disinfection tank.
Column membrane filtration: After the effluent is sterilized, it is pressurized to the column filter system. The column membrane is designed as two groups of two branches. It is used one by one and is automatically switched to operate. After the effluent reaches the standard discharge.
Debugging of the device 1. Preparations before operation 1.1 Check the condition of the device No abnormality.
1.2 Whether the motors and fans of each department are flexible or not, and whether the electrical control components are reliable or not.
1.3 Check the lubricating oil filling of the fan.
1.4 The groundwater integrated sewage treatment equipment shall be flushed with clean water. Check whether the pipeline joints are leaking. Open the fan and open the ventilation valve to check if the air duct is leaky and the electrical control and other facilities components are operating normally. The operation is reliable and there is no abnormality. noise.
2. Commissioning work 2.1 Fill the contact tank with sewage.
2.2 start the fan, open the inlet valve for aeration and adjust the amount of gas (the gas-water ratio of 15:1), once adjusted, generally does not change.
2.3 Underground integrated wastewater treatment equipment The sewage that comes into contact with the oxidation tank flows into the sedimentation tank. The sludge in the sedimentation tank is returned to the air and the return flow rate varies depending on the activated sludge content of the aeration tank and is determined according to the amount of settled sludge. Excess sludge is raised to the sludge pool.
2.4 According to the amount of water, the dosing device in the disinfection chamber is loaded into a solid chlorine tablet and periodically added. Users are required to purchase accessories when commissioning equipment.
3. Normal operation and operation of the equipment Because sewage treatment is the use of the synthesis, decomposition, and reaction of microorganisms, microbial culture directly affects the effect of the entire treatment system. Domestic sewage is biodegradable and relatively easy to cultivate. The specific steps are as follows:
3.1 Fill the contact cell according to the normal procedure.
3.2 start the fan, aeration and oxygenation of the pool of sewage run for 6-8 hours, stop 3-5 hours, drain off 1/3 of the supernatant.
3.3 The buried integrated wastewater treatment equipment re-introduces water, continues to aerate and oxygenate for 6-8 hours, and stops for 3-5 hours.
3.4 In this way, the daily intake time is relatively prolonged. After 7-15 days, the clear flocculent or supernatant is apparent in the pool, indicating that the basic culture of the organism has been successfully cultured.
3.5 At the same time, it is also possible to observe the filling conditions in the contact pool. For example, if a yellow or orange black film grows on the packing, the biofilm has been cultivated. At this time, the water is clear and the sense is good. At this time, the microorganism acclimation is basically completed and the equipment can be transferred. Into normal operation.
3.6 The domestication of microorganisms takes a long time. If ready-to-use activated sludge is used, ready-made activated sludge should be used as much as possible to speed up the formation of biofilm.
Xiaoyu Environmental Services:
â—‡ Stand in the position of the customer (or consumer) rather than stand in the company's position to research, design, and improve services.
â—‡ Improve the service system, strengthen pre-sales, sales, and after-sales services, and promptly help solve various problems in the use of products by customers, so that customers feel great convenience.
â—‡ highly value customer opinions, allow customers to participate in decision-making, and treat customers' opinions as an important part of customer satisfaction.
Energy-saving approaches for various treatment structures 1. Wastewater lifting pump room Sewage lifting pump room should save energy consumption. The main consideration is to consider how the sewage lifting pump can save electric energy. The correct and scientific selection of the pump is the effective means for the pump to work in the efficient section. Buried integrated wastewater treatment equipment rationally uses the terrain. It is also an effective method to reduce the lifting height of the sewage to reduce the shaft power of the pump. Regular maintenance of the pump can reduce the power consumption.
2. The grit chamber adopts advection grit. It avoids the use of grit chambers that require power equipment. Buried integrated wastewater treatment equipment such as advective grit chambers. Gravity sand expulsion. Avoid mechanical sand removal. These measures can be greatly Save energy.
3. Initial sedimentation tank The initial sedimentation tank has a low energy consumption. The main energy consumption is on the mud discharge equipment. Using hydrostatic pressure method will undoubtedly reduce the energy consumption.
4. The energy consumption of biological treatment aeration systems is quite large. Research on energy efficiency of aeration systems always involves the transformation and innovation of aeration equipment. Although new types of aeration equipment are emerging in an endless stream, they can still be divided into 2 categories. : The first is the use of submerged porous diffuser heads or air nozzles to produce air bubbles that transfer oxygen into the aqueous solution. The second is a method of mechanically agitating the wastewater to promote the dissolution of oxygen in the atmosphere. Sewage treatment equipment micropore aeration. Aeration diffuser layout and adjustment of the aeration system These are effective measures to save energy. In the traditional activated sludge treatment plant aeration tank to create front-end anaerobic zone. With submerged Blender energy-saving and biological phosphorus removal program. This simple modification can save nearly 20% of the aeration energy consumption. If you count the energy mix, the integrated underground sewage treatment equipment can save energy by 12%. Automatic control The system's application in wastewater treatment is energy-saving. The aeration system performs stage aeration. There is a concentration gradient of dissolved oxygen, which reduces energy consumption. It can also improve the treatment effect and reduce the amount of sludge. The biofilm treatment process can be obviously treated with anaerobic treatment. Reduce energy consumption.
5. The study of mud discharge equipment in the secondary sedimentation tank and the improvement of sludge discharge method are effective methods to reduce energy consumption.
6. Sludge treatment Underground integrated sewage treatment equipment Sludge treatment system Energy-saving research mainly focuses on the energy recovery of sludge treatment. Energy recovery from organic pollutants in sewage sludge is used in the treatment process as early as the beginning of the last century. Put into practice. But before the energy crisis has been ignored. There are two ways to recover: First, sludge anaerobic digestion gas utilization. First, the use of sludge incineration heat.
Digestive gas is stable in nature and easy to store. It can be converted into mechanical energy or electric energy through internal combustion engines or fuel cells. Waste heat can also be recovered in digested sludge for heating. Therefore, the use of digested gas can solve different levels of energy self-sufficiency in sewage treatment plants. Compare biogas generators The two types of utilization of fuel cells are considered. The fuel cells have a high energy utilization rate. They have a good future for development. The maximum utilization of digestive gas is the main way to improve energy efficiency. The research and application of biogas generators in grid-connected power generation has been applied in China. There are application examples. It is a feasible way for the comprehensive utilization of biogas in large-scale sewage treatment plants. Another way of energy recovery is to build the municipal solid waste incineration plant beside the sewage treatment plant. Burn solid waste together with sewage sludge. For the operation of the plant.
Electrical control description and working principle The electrical control system of the equipment adopts PLC programmable logic controller to achieve automatic control to realize modern equipment management, and set manual and automatic conversion control. There are multiple groups of automatic alarm and interlock functions.
(A) The liquid level control function sets three float level controllers in the adjusting tank respectively: it shows the status of the three liquid levels in the adjusting tank.
1. Low level control float:
When adjusting the liquid level in the tank to the minimum liquid level, the floating ball control contact is disconnected, and the buried integrated sewage treatment equipment automatically stops the sewage pump to avoid damaging the submersible sewage pump due to the evacuation of the sewage in the regulating tank, and when adjusting the inside of the tank When the liquid level is higher than the minimum level, the float control contact is turned on, and the sewage pump can start. (The original design minimum level was -3.45m)
2. Normal level control float:
Only when the normal liquid level control ball float control contact is turned on, the automatic control can be enabled for the first time and then run according to the programmed procedure. When the normal liquid level control float ball control contact is disconnected, the PLC programmable controller can be used. Can not start, buried integrated sewage treatment equipment in the first start-up operation, the normal liquid level control float ball control contact must be in the ON state, PLC can automatically run.
3. High level control float:
When the water level in the adjustment tank exceeds the maximum level, the control point for the high-level control float ball is turned on to provide an alarm, prompting to intensify the treatment of the sewage.
(B) Programmable Controller Operation Procedure 1. Turn on the power and enter the automatic operation state.
2. At this time, one pump and one fan start running. After 8 hours of continuous operation of the fan, the pump is alternately running for 4 hours. If the level in the adjustment tank reaches the low level, it will automatically stop and start automatically. Another pump and fan are running. If the liquid level in the adjustment tank is still higher than the low level, it will automatically switch to the previous set of pumps and fans. In order to alternate operation.
3. If the adjustment tank liquid level is lower than the minimum level, the low level control float ball contact action is disconnected, a group of pumps and fans automatically stop, when the stop time exceeds 2 hours, that is, the water level is still at the lowest level At the time, the buried integrated sewage treatment equipment fan will automatically start running for 0.5 hours. After 0.5 hours, the fan will automatically stop. If the low level control float ball control contact is still turned on, the fan will run for 0.5 hours after 2 hours.
4. If the low level control float control contact is turned on and the liquid level is higher than the minimum water level, go to step 2 and the buried level integrated wastewater treatment equipment low level control float ball control contact is disconnected, ie the liquid level Below the minimum level, go to step 3 for work.
Note: The PLC programmable logic controller has been prepared by the electrical engineer of our company. The user cannot modify it by themselves. The manual operation control refers to the automatic operation.
Pipeline pressure test and flushing air pipes are tested for strength and tightness according to design requirements, and other pipelines are pressure tested.
1) Pipeline pressure test (1) Steel pipe pressure test 1 According to the different media (air, sludge, and water) transported by the pipeline, the test pressure of the various pipelines is different, and the test medium used is different.
2 All kinds of pipeline test operation method refers to "Code for construction and acceptance of industrial metal pipeline engineering" GB50235-97. The water pressure test uses the temporary water supply in the plant; the air pressure test uses the air compressor to supply air.
(2) UPVC pipe test pressure 1 Preparation A. UPVC pipe joints Consolidation protection: When the pipe section pressure test, the elbow and joints are consolidated to prevent them from moving after pressure test.
B. Carefully inspect the appearance of pipelines, nodes, interfaces, support piers and other ancillary structures, and check whether the pipeline can be properly vented and drained according to the design of the water level meter.
C. Inspect equipment such as pressure test equipment, pressure gauges, bleed air pipes, and water intake pipes, and check the tightness and function of the pressure test system of the buried integrated sewage treatment equipment. At the same time, the firmness of the support at the end of the pipe, elbows and tees is carefully checked.
2 Test A. Slowly inject water into the pressure test tube while draining the air inside the tube. After the pipe is filled with water, keep it for at least 12 hours without pressure.
B. Conduct pipe tightness test, pressurize the water in the pipe to 0.35MPa, and keep it for 2h. Buried integrated wastewater treatment equipment checks for leaks or other abnormalities at various locations. In order to maintain the pressure inside the tube, water can be supplied to the tube.
C. After the rigorous test passes the strength test, press the test pressure in the tube to maintain the test pressure for 2 hours or meet the special requirements of the design. Whenever the pressure drops 0.02 MPa, the tube is filled with water. Buried integrated wastewater treatment equipment calculates the value of water leakage by adding water to maintain the pressure in the pipe. The strength test results were judged based on the presence or absence of abnormalities and water leakage. The allowable seepage volume is shown in Table 5.1.5 of "CECS18:90".
D. After the test, release the water in the pipeline.
E. Hydraulic pressure test meets the following requirements:
a. Tightness test. In the tightness test, if there is no leakage in 2h, it is qualified.
b. Strength test. In the strength test, if the amount of water leakage does not exceed the specified allowable value, the test tube section is subjected to the strength test.
Leakage per tube segment (L/min): 0.2 to 0.24
F. Observe the following rules when pressure testing:
a. The pressure test can only be carried out for 48 hours after the installation of the bonded pipe.
b. The support of the three-way and elbows on the pressure test section, especially the end of the tube, must have sufficient stability. For a thrust block with a concrete structure, sufficient solidification time is required before the test to achieve a rated compressive strength.
c. During the pressure test, water is injected into the pipe and the air in the pipe is drained. The water slowly enters the pipe to prevent the occurrence of a hammer or water hammer.
2) Pipeline flushing (1) After the pipeline pressure test of the water flushing pipeline is completed, the pipeline flushing is performed before the completion acceptance. When rinsing, continuously rinse with flushing water with a flow rate of not less than 1.0m/s until the turbidity and chroma at the outlet are the same as the turbidity and chroma of the flushing water at the inlet.
(2) After the tightness and strength test of the gas flushing pipeline is qualified, the pipeline is flushed. Purge wind speed and standards are in accordance with the installation technical documents. When blowing, please ask Party A to do covert inspection. After passing inspection, protect it and prevent debris from entering the pipe.
Sewage treatment process description The buried integrated wastewater treatment facility adopts the AO integrated wastewater treatment facility, which is based on Party A's procurement. This project is only used as a basis for investment control.
Grid machine: Remove grease and other solids from the water to ensure the quality of integrated raw water.
Acidification conditioning tank: converts macromolecules into small molecules, converts the cyclic structure into a chain structure, reduces the chromaticity of the wastewater, and further increases the BOD/COD ratio of the wastewater to increase the biodegradability of the wastewater, creating a follow-up process good environment.
Contact tank and oxidation tank: Oxygenation is characterized by the setting of packing material in the aeration tank to cut small molecules. The bottom aeration oxygenates the sewage and makes the sewage in the tank flow to ensure the sewage and sewage. The fillers are in full contact with the microorganisms and algae on the filler. The pollutants in the sewage are quickly and effectively degraded and the deoxidation pool is formed by setting a highly efficient ecological base and aeration system in the pool.
In the contact oxidation tank, the aeration of the bottom of the tank aerates the sewage and oxygenizes the sewage in the tank to ensure that the sewage is in full contact with the high-efficiency ecological base. This avoids the defects in the contact between the sewage and the ecological base in the biological contact oxidation tank. .
The oxygen required by the microorganisms in the contact oxidation tank is supplied by the aerator. When the biofilm grows to a certain thickness on the ecological base, the ecological-based microorganisms undergo anaerobic metabolism due to lack of oxygen, and the generated gas and aeration form a scour. The effect will cause the biofilm to fall off and promote the growth of new biofilms. At this point, the shedding biofilm will flow out of the pool with the effluent.
Contact Oxidation Tanks In the early stages of operation, a small amount of bacteria adhered to the surface of the ecological substrate, and a thin biofilm gradually formed due to bacterial growth. Under the conditions of sufficient dissolved oxygen and food, the microorganisms multiply rapidly and the biofilm gradually thickens. Dissolved oxygen and organic matter in the sewage are used by microorganisms due to diffusion. However, when the biofilm reaches a certain thickness, oxygen is no longer able to diffuse into the inner layer of the biofilm, and aerobic bacteria die. The facultative bacteria and anaerobic bacteria begin to reverse on the inner layer, forming an anaerobic layer and using the dead aerobic bacteria as Matrix, and on this basis continue to develop anaerobic bacteria. Due to this special A/O environment on the surface of the ecological base, the oxidation tank can more effectively remove the ammonia nitrogen in the sewage.
After a period of time, the number began to decline, coupled with the escape of metabolic products, causing a large amount of inner biofilm to fall off.
On the surface of the ecological substrate where the biofilm has fallen off, new biofilms have re-emerged. In the contact oxidation cell, due to the large surface area of ​​the high-efficiency ecological substrate, each stage of the biofilm development exists at the same time, so that the ability to remove organic substances is stabilized at a certain level.
The repeated operation modes of "aerobic-anoxic" and "aerobic-anaerobic" enhanced the absorption of phosphorus and nitrification-denitrification, resulting in a removal rate of nitrogen and phosphorus of more than 80%, which ensured that the effluent index was qualified.
Adding medicine disinfecting pool: In order to eliminate the virus, chlorine dioxide is used for disinfection, and the water can be discharged after being disinfected by a disinfection tank.
Column membrane filtration: After the effluent is sterilized, it is pressurized to the column filter system. The column membrane is designed as two groups of two branches. It is used one by one and is automatically switched to operate. After the effluent reaches the standard discharge.
Debugging of the device 1. Preparations before operation 1.1 Check the condition of the device No abnormality.
1.2 Whether the motors and fans of each department are flexible or not, and whether the electrical control components are reliable or not.
1.3 Check the lubricating oil filling of the fan.
1.4 The groundwater integrated sewage treatment equipment shall be flushed with clean water. Check whether the pipeline joints are leaking. Open the fan and open the ventilation valve to check if the air duct is leaky and the electrical control and other facilities components are operating normally. The operation is reliable and there is no abnormality. noise.
2. Commissioning work 2.1 Fill the contact tank with sewage.
2.2 start the fan, open the inlet valve for aeration and adjust the amount of gas (the gas-water ratio of 15:1), once adjusted, generally does not change.
2.3 Underground integrated wastewater treatment equipment The sewage that comes into contact with the oxidation tank flows into the sedimentation tank. The sludge in the sedimentation tank is returned to the air and the return flow rate varies depending on the activated sludge content of the aeration tank and is determined according to the amount of settled sludge. Excess sludge is raised to the sludge pool.
2.4 According to the amount of water, the dosing device in the disinfection chamber is loaded into a solid chlorine tablet and periodically added. Users are required to purchase accessories when commissioning equipment.
3. Normal operation and operation of the equipment Because sewage treatment is the use of the synthesis, decomposition, and reaction of microorganisms, microbial culture directly affects the effect of the entire treatment system. Domestic sewage is biodegradable and relatively easy to cultivate. The specific steps are as follows:
3.1 Fill the contact cell according to the normal procedure.
3.2 start the fan, aeration and oxygenation of the pool of sewage run for 6-8 hours, stop 3-5 hours, drain off 1/3 of the supernatant.
3.3 The buried integrated wastewater treatment equipment re-introduces water, continues to aerate and oxygenate for 6-8 hours, and stops for 3-5 hours.
3.4 In this way, the daily intake time is relatively prolonged. After 7-15 days, the clear flocculent or supernatant is apparent in the pool, indicating that the basic culture of the organism has been successfully cultured.
3.5 At the same time, it is also possible to observe the filling conditions in the contact pool. For example, if a yellow or orange black film grows on the packing, the biofilm has been cultivated. At this time, the water is clear and the sense is good. At this time, the microorganism acclimation is basically completed and the equipment can be transferred. Into normal operation.
3.6 The domestication of microorganisms takes a long time. If ready-to-use activated sludge is used, ready-made activated sludge should be used as much as possible to speed up the formation of biofilm.
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