Buried sewage treatment integrated equipment

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Detailed introduction of sewage treatment integrated equipment

First, the equipment introduction

Buried sewage treatment equipment is generally buried, and the upper part of the equipment can be used as a green belt, parking lot, road, etc. The buried sewage treatment equipment can be placed in a semi-buried manner, and the buried depth can be determined according to the needs of the user. The buried sewage treatment equipment can be placed above the outdoor surface. In-situ sewage treatment, such as in cold areas, can raise the inspection holes and allow the equipment to be buried below the frozen soil. Buried sewage treatment equipment may not be arranged in a standard arrangement and arranged according to the terrain.

Hospitals, ports, commercial centers, residential areas, schools, etc. can be called a community. It is a relatively independent area. The drainage system is usually not covered by the city's municipal pipe network. According to local environmental standards, independent Sewage treatment facilities, this is what we refer to as sewage treatment in the community. The sewage in the community is different from the urban sewage. It belongs to the category of domestic sewage. The water quality and quantity of water can be summarized as follows: the water quality and quantity change greatly, the pollutant concentration is lower than the urban sewage, the biodegradability is good, and the treatment is difficult. Due to the small amount of sewage treatment in the community, the treatment process without sludge or less sludge should be used as much as possible in the process design to prevent secondary pollution caused by poor treatment. At present, biological contact oxidation is a widely used method of applying Zui. The main advantage is that the residence time is short and the film is easy to hang, especially suitable for equipment and buried construction. This method is small in scale and is suitable for communities that discharge less than one thousand tons of sewage per day. For the treatment of thousands of tons of residential sewage, it is recommended to use the ground construction method. The biological treatment part can be contact oxidation, or SBR or its improved CASS process.

Second, the equipment process composition

The WSZ-A type buried domestic sewage treatment equipment is mainly designed for the treatment of domestic sewage and similar industrial organic sewage. The main means of treatment is the use of more mature biochemical treatment technology - contact oxidation, water quality parameters according to the general water quality of life, influent BOD 20Omg / l, the effluent BOD 20mg / l index design, a total of six parts: ( 1) primary sedimentation tank; (2) contact oxidation pond; (3) secondary sedimentation tank; (4) disinfection tank, disinfection device; (5) sludge tank; (6) fan house, fan;
The underground sewage treatment equipment is now discussed as follows:
(1) Primary sedimentation tank: The primary sedimentation tank of the buried domestic sewage treatment equipment is a vertical flow sedimentation tank. The rising flow rate of sewage in the sedimentation tank is 0.6-0.7 mm / sec, and the settled sludge is lifted with air. Mud pool. (Note: WSZ-A O.5-5m3/h does not have a primary sink)
(2) Contact oxidation pond: After the initial sedimentation, the water flows from the water to the contact pool for biochemical treatment. The contact pool is divided into three stages, and the total residence time is more than one hour. The reinforced time of the reinforced equipment is up to 6 hours, and the filler is a novel trapezoidal packing. Conjunctival, not blocked. The specific surface area of ​​the filler is 160m2/m3 , and the gas-water ratio of the contact pool is about 12:1 . (Note WSZ-A 0.5-5T/h , contact pool is level 2)
(3) Secondary sedimentation tank: After biochemical treatment, the sewage flows to the secondary sedimentation tank, and the secondary sedimentation tank is two vertical flow sedimentation tanks, which are operated in parallel. The rising flow rate is 0.03-0.4 mm / sec. The mud is lifted to the sludge tank by air. (Note WSZ-A0.5-5mT/h , sludge flows into the sludge tank)
(4) Disinfection tank and disinfection device: The disinfection tank is in accordance with the specification: “TJI4—74” is 30 minutes. If it is hospital sewage, the disinfection tank can increase the residence time to 1-1.5 hours, using solid chlorine tablets in contact with dissolved disinfection method. The disinfection device can continuously change the dosage according to the amount of water, and achieve the purpose of adding more water and adding less medicine. Other disinfection devices can be prepared separately. (Note : If it is used in industrial sewage disinfection tanks and disinfection devices, please do not )
(5) Sludge tank: All sludges in the primary sedimentation tank and the secondary sedimentation tank are extracted into the sludge tank of WSZ-A by air for aerobic digestion. The supernatant of the sludge tank is returned to the contact oxidation pond for reprocessing. There is very little residual sludge after digestion, and it is usually cleaned once every 1-2 years. The cleaning method can be carried out from the inspection hole of the sludge tank to the bottom of the sludge by suction truck for suction and transportation. ( WSZ-A 0.5-5T/h , sludge is anaerobic)
(6) Fan room and fan: The fan room of WSZ-A buried sewage treatment equipment is located above the disinfection tank. The entrance adopts double-layer sound insulation. The air inlet has noise elimination equipment and fan filter, so there is no noise during operation. . The fan uses two L -type Roots blowers, which can automatically run alternately. The operating life of a single fan is about 30,000 hours.

Third, the equipment features

1. The equipment can handle domestic system integrated wastewater and its similar organic sewage.

2. The secondary biological contact oxidation treatment process of the equipment adopts the contact oxidation process, and is smaller than the activated sludge, has good adaptability to water quality, and the effluent water quality is stable, and sludge growth does not occur.

3 , the equipment can be buried below the surface, the surface can be used for greening or square land, so the equipment does not occupy the surface area, no need to build a house, and no need for heating and insulation.

4 , the complete set of equipment is simple to construct, easy to operate, all mechanical equipment is automatically controlled, all equipment is below the surface.

5 , the entire processing equipment generally does not require special personnel management, only need to timely maintain and maintain the equipment.

6 , do not need to compress the container. Equipment such as air compressors and circulation pumps greatly reduce investment costs.

7 , low power required, less maintenance and manual operations.

8. If the equipment is used in a cold zone, the inspection hole may be raised to make the equipment buried below the frozen soil.

9. The integrated buried domestic sewage treatment equipment consists of two-stage pools. The first stage is a reinforced concrete structure with a large buried depth, and the other group is a steel structure with a shallow depth. The steel structure pool adopts the domestic first interpenetrating network anticorrosive coating for anticorrosion. It is a rubber network and a plastic network interpenetrating to form an interpenetrating network polymer, which can withstand acid, alkali, salt, gasoline, kerosene, aging, and abrasion resistance, and can bring rust and rust. After the equipment is generally painted, the anti-corrosion life can reach more than 15 years.

Fourth, the equipment model

Remarks:

â—†The first-stage lifting pump is determined according to the comprehensive factors of the water level and the flow rate. Two units (one for one) and one for the 100 tons/day or three pumps (two for one) are used. To ensure the smooth operation of the system.

â—† If the recycling requirement is met, the recycling part is selected according to user requirements. The part that can be used can be set in the equipment room or buried.

â—† The amount of treated water not listed in the table can be freely combined to meet the processing requirements.

â—† For sewage treatment stations with a capacity of more than 200 tons/day, it is recommended to use integrated grounding equipment with steel-concrete structure.

â—† Biochemical retention time is determined based on water quality. The comprehensive sewage of life can adopt two-stage biochemistry, and the high-quality miscellaneous drainage can adopt the first-grade biochemical. The high-efficiency organic wastewater can appropriately lengthen the biochemical residence time.

As the product is updated, the parameters will change, subject to the actual order contract product parameters.

V. Introduction to the process

1. The sewage from the drainage pipe network intercepts the larger particles and floating objects through the grille, and is lifted to the primary sedimentation tank by the septic tank to precipitate larger particles.

2. The biological contact oxidation method is to place a filler in the reactor, and the biological filler is used as a carrier to contact the filler filled with the biofilm through the oxygenated wastewater, and the wastewater is purified under the action of the biofilm. Its working principle and advantages are as follows:

(1) Principle:

In the early stage of the operation, a small amount of bacteria adhered to the surface of the filler, and a very thin biofilm was formed due to the growth of bacteria. Under conditions of sufficient dissolved oxygen and food, the microbes multiply rapidly and the biofilm gradually thickens. Microorganisms convert pollutants in sewage into microbial cells and various substances such as CO2, H2O, H2S, N2, CH4, etc. The organic substances in dissolved oxygen and sewage are utilized by microorganisms by diffusion. When the biofilm reaches a certain thickness, oxygen has not been able to diffuse into the inner layer of the biofilm. Aerobic bacteria die and fall off, while facultative bacteria and anaerobic bacteria begin to multiply in the inner layer to form an anaerobic layer, using dead aerobic bacteria as a substrate, and on this basis, anaerobic bacteria are continuously developed. After a period of time, the amount begins to decrease, and the escape of the metabolic gas product causes the inner biofilm to fall off. On the surface of the filler where the biofilm has fallen off, the new biofilm has re-developed. In the contact oxidation pond, due to the large surface area of ​​the filler, each stage of biofilm development is present at the same time, so that the ability to remove organic matter is stabilized at a certain level. The biofilm has a three-dimensional structure in the pool, which is advantageous for maintaining stable processing ability.

(2) Advantages:

The volume load is high, the processing time is short, and the floor space is saved. The volumetric load of the biological contact oxidation method is as high as 3-6 kg BOD (m3.d), and the volume load can be 5 times higher than that of the activated sludge method.

The biological activity is high, and the aeration tube is set under the filler, which is not only sufficient for oxygen. Moreover, the biofilm is stirred to accelerate the renewal of the biofilm and increase the biofilm activity. Its aerobic rate is 1.8 times higher than that of the activated sludge process.

There is a high microbial concentration. The concentration of activated sludge is generally 2?3g/l. Most of the microorganisms in the contact oxidation pool are attached to the filler. The concentration of microorganisms in water and filler per unit volume can reach 10?20g/l. Due to the high concentration of microorganisms, it is beneficial to increase the volumetric load.

The sludge production is low and sludge backflow is not required. Compared with the activated sludge process, the volumetric load of the contact oxidation process is high, but the sludge production is not only low, but is reduced. Since the microorganisms adhere to the filler to form a biofilm, the biofilm can be automatically balanced by the shedding and growth, so that no sludge needs to be returned, which brings convenience to management.

The effluent water quality is good and stable. When the influent water changes suddenly in the short term, the effluent water quality is affected little. The appearance of the effluent is clear and transparent, such as adding sand filtration. Can be used for reuse of water.

The power consumption is low, and the biological contact oxidation process is used to treat sewage, which generally saves 30% of power.

It is convenient to hang the membrane. For the wastewater containing less bacteria, the bacteria are connected when the membrane is attached. The biofilm can be matured after more than ten days of operation. When the power is cut off or the accident cannot be supplied, the water in the oxidation tank can be discharged. The microorganisms attached to the fixed bed can maintain oxygen from the air and survive. After the test, the membrane can be returned to normal within a few days. There is no sludge expansion problem, and bacteria which are prone to swelling in activated sludge, such as filamentous bacteria, not only do not swell in the contact oxidation pool, but also can fully exert the advantages of high decomposition and oxidation ability. The filler in the contact oxidation tank is fixed in water, and the filamentous bacteria attached to the filler have strong ability to decompose organic matter, have a three-dimensional structure, but have poor sedimentation performance, and easily flow out with the water in the aeration tank, so that sludge expansion is not easily generated. problem.

3. The second settling tank adopts inclined tube sedimentation tank. There are two obvious disadvantages in common sedimentation tank: First, the removal rate of suspended solids is not high, generally only 40?60%; second, it is bulky and covers an area to overcome the above. Disadvantages, according to the principle of shallow settlement, a inclined tube sedimentation tank was designed. Under the condition that the volume V and the depth H of the pool are constant, if the flow rate Q is increased, the sedimentation speed u is obtained. This increases, thereby reducing the sedimentation efficiency; conversely, to increase the removal rate (reducing u0), the flow rate Q must be reduced. That is to say, there is a contradiction between improving the sedimentation efficiency and increasing the processing capacity.

However, if the sedimentation zone height H of the sedimentation tank is divided into n horizontal shallow pools of high h, then the total surface area of ​​the sedimentation tank is increased from A to nA, and the sedimentation velocity is also changed from u0Q/A to =Q/nA. That is, u0=u0/n, so that the sedimentation efficiency can be greatly improved under the condition that the amount of treated water is constant. That is to say, when the original removal rate is kept constant, the amount of treated water in the shallow pool of the same volume is n times larger than the original.

Not only that, the shallow pool settlement can greatly improve the hydraulic conditions of the sedimentation process. When the Reynolds number Re of the water flow between the pipe and the parallel plate is less than 2000 and 1000 respectively, the water flow is in a laminar flow state. In fact, in the sedimentation tank formed by the inclined pipe, the hydraulic radius is small due to the large wet circumference, so Re The value can be reduced to below 100, the water flow is still in a stable laminar flow state, and the sedimentation of suspended solids is not affected by the pulse velocity generated by the turbulent flow, which is extremely advantageous for sedimentation.

6. Start and stop of the sewage treatment system

1. Preparation before sewage treatment and commissioning

1) Chemicals, instruments and meters are complete, and each test instrument is in standby state.

2) Carry out a comprehensive inspection of the system, and the valves in the system are tight, flexible and easy to use.

3) Check whether the fastening bolts and screws of each pump are loose; the pump and production site should be clean and free of debris, dust and oil.

4) Check if the amount of lubricant in the pump and fan is appropriate, and whether the cooling water of the rotating machine is unblocked.

5) Whether the rotation coupling of each pump rotates evenly and there is no card position.

6) Whether the direction of rotation of the motor is consistent with the direction of rotation of the pump.

2. Start and stop the operation of the sewage treatment system:

(starting of the whole set of equipment)

1) Before putting the whole system into trial operation, it is necessary to carry out step-by-step debugging according to the requirements of the various equipments in the system, and only after the step-by-step debugging is passed, the whole system can be put into operation.

2) Check whether all equipment installations are completed according to the requirements before starting. Whether the on-site lighting is sufficient, whether the medicines are prepared well, and the dosing system is in standby state.

3) Start the sewage pump and municipal sewage pump in the plant area, open the exit door and inlet door of the sewage lift pump, and close the mud drain valve of the regulating tank so that the water in the regulating tank is full.

4) When adjusting the liquid level of the tank 2/3, start the integrated sewage lifting pump, open the integrated sewage pump outlet door, the entrance door, the hydrolysis aerobic tank inlet door, and close the contact oxidation tank mud discharge valve to make the water enter the contact oxidation pool. .

5) Start the fan. After the fan is running normally, open the fan outlet door and blow the helium into the aerobic tank.

6) When the water level of the aerobic pool is to be hydrolyzed by 2/3, the outlet valve of the hydrolyzed aerobic tank is opened, and the water is sent to the mechanical reactor. When the water level rises to 1/2, the dosing device is started to add the medicine to the mechanical reactor. .

7) When the water level of the reaction sedimentation tank reaches the overflow state, close the drain valve of the collecting tank and drain the water into the collecting tank.

8) When the water level of the sump reaches 2/3, open the exit door of the sump A and B side, open the lift pump outlet and inlet valve, start the lift pump, and put the water into the high efficiency fiber filter. The chlorination system is activated to add a disinfectant to the sewage treatment system before the water enters the high efficiency fiber filter.

7. Xiaoyu Environmental Protection Water Treatment Co., Ltd.

Xiaoyu Environmental Water Treatment Equipment Co., Ltd. has been adhering to the business philosophy of “all-round service, making users more satisfied” for many years, and strives to provide users with quality products and excellent services. The company attaches great importance to every project and has a specialist responsible for the after-sales service of the users. Here, we solemnly promise:
1. The warranty period of this project is one year (that is, the time within one year after the project is put into operation is the project warranty period). During the warranty period, the user is provided with free warranty service. After the warranty period, according to the user's needs, we can provide long-term paid warranty service. And technical guidance work.
2. During the warranty period, no matter whether it is normal or holidays, after receiving the user's fault notification, our company's processing specialist will immediately organize the personnel to arrive at the scene to deal with the fault.
3. After the commissioning of the sewage treatment station has been transferred to Party A for 3 months, the technicians will be sent back to understand the operation status and listen to the opinions of the users, and further improve them.
4, the user needs to provide operational management services.

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