CN114409206A - Low-energy-consumption high-concentration organic food wastewater treatment device and method - Google Patents

Abstract

The invention discloses a low-energy-consumption high-concentration organic food wastewater treatment device and method. It is mainly used for treating organic food waste water with high suspended matter, animal and vegetable oil and salinity. The process flow is 'Dissolved Air Flotation (DAF) + fluidized bed biofilm reactor (MBBR) + DAF) + Ultrafiltration (UF) + Reverse Osmosis (RO)' the process breaks through the treatment mode of the anaerobic process as the pretreatment process section of the aerobic treatment in the traditional process, greatly reduces the possibility of unstable operation and the unsafe operation factors caused by the biogas production in the operation process, and the process completely adopts the aerobic treatment technology, has small integral occupied area, large microbial content in the treatment process, high operation load and high organic matter removal efficiency.

Description

A low-energy consumption and high-concentration organic food waste water treatment device and method

technical field

The invention belongs to the technical field of aerobic sewage treatment with low energy consumption. It relates to a device and method for treating high-concentration organic food waste water.

Background technique

my country's water pollution mainly comes from two aspects, one is industrial wastewater exceeding the standard, and the other is a large amount of domestic sewage generated during the continuous development of urbanization. The shortage of water resources in my country is not local, but universal, and some areas such as North China and Northwest China lack water resources. Obviously, with the rapid growth of coastal areas, the amount of water intake and sewage discharge has increased rapidly, the shortage of water resources and poor water quality have become increasingly prominent, and the contradiction between industrial and agricultural production and domestic water consumption is prominent. In order to ensure residential water use, some areas limit the supply of industrial water. , or take economic measures to collect taxes and fees on the part of industrial water that exceeds the limit, so as to force enterprises to tap their potential, use water rationally, save water, improve water reuse rate, and reuse sewage to reduce water intake for production. It can be seen that the treatment and reuse of industrial sewage is feasible, and it can greatly improve the efficiency of water utilization, thereby reducing the amount of industrial water intake, and the reuse of industrial sewage in my country is universal.

In actual production, there is such a food waste water. The waste water produced in the production process is characterized by high suspended solids, animal and vegetable oils, high salinity, high organic content, and difficult sewage treatment. It is more difficult to realize the recycling of this kind of wastewater. According to the characteristics of this wastewater, the traditional process adopts the wastewater treatment process of "anaerobic + hydrolytic acidification + aerobic". This treatment process has many disadvantages, such as large area and high construction investment; long debugging period, easy acidification of anaerobic sludge, unstable operation, and difficulty in realizing automatic control during operation.

Another process is the MBR membrane bioreactor process. The front end still needs to use an anaerobic process, and the aerobic process at the back end uses MBR. Most of the pollutants are removed by the activated sludge in the mixed liquid, and then the water is filtered out by the membrane under the action of external pressure. This type of membrane bioreactor relies on pumping out water, and has relatively low energy consumption; it occupies a more compact area than the split type, and has received special attention in the field of water treatment in recent years. However, generally the membrane flux is relatively low, membrane fouling is prone to occur, and it is not easy to clean and replace the membrane after fouling. Especially for high-concentration organic food wastewater, the content of animal and vegetable oils is high, and the operating efficiency of the membrane bioreactor is more difficult to guarantee.

The many drawbacks of the current process make it difficult for technicians engaged in sewage treatment to choose, and it is difficult to improve the water treatment effect and water utilization efficiency.

Aiming at the disadvantages of the prior art, the present invention provides a low-energy consumption and high-concentration organic food waste water treatment device and a technological process. The technological process is "dissolved air flotation (DAF) + fluidized bed biofilm reactor (MBBR) + DAF + Ultrafiltration (UF) + reverse osmosis (RO)" This process breaks the traditional process of using anaerobic process section as the pre-treatment process section of aerobic treatment, greatly reducing the possibility of unstable operation, and Due to the unsafe operation caused by the biogas produced in the process, the process completely adopts aerobic treatment technology, the overall footprint is small, the microbial content in the treatment process is large, the operation load is high, and the organic matter removal efficiency is high.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention discloses a low-energy consumption and high-concentration organic food waste water treatment device, which is characterized in that it comprises a water inlet 1, a regulating tank 6, a first-level DAF10, an MBBR tank 13, a sedimentation tank 17, and an intermediate water tank 24. , secondary DAF28, precision filter 30, UF+RO system 31; the water inlet 1 is connected to the adjustment tank 6 and the accident storage tank 2 respectively, and the adjustment tank 6 is located outdoors and is connected to the accident storage tank 2, MBBR tank 13, and sedimentation tank 17 , the intermediate pool 24 and the sludge pool 32 together form a combined pool body;

The rear of the described conditioning tank 6 is connected with the first-level DAF10, the MBBR tank 13, the sedimentation tank 17, the intermediate water tank 24, the second-level DAF28, the precision filter 30, and the UF+RO system 31 in turn, and the first-level DAF10 and the second-level DAF28 are located in the integrated Workshop 2nd floor;

A perforated aeration pipe is arranged at the inner bottom of the adjustment tank 6, and the perforated aeration pipe is connected with the first blowing system 12. A second lifting pump 7 is arranged inside the tank body of the adjustment tank, and the outlet pipeline of the second lifting pump 7 is connected to the first electromagnetic flow rate. The meter 9 is then connected to the first-level DAF10. In the adjustment tank, the second liquid level control system 8 is set. The liquid level control is divided into low level, high level and high level. The accident storage tank 2 is adjacent to the adjustment tank 6, and the front end is connected to the water inlet 1. , the rear end is connected in two directions, namely the adjustment tank and the accident discharge port 4. The accident storage tank 2 is provided with a first lifting water pump 3 and a first liquid level control system 5, and the first lifting water pump 3 is connected to the adjustment tank 6. And the accident discharge port 4, the accident discharge port 4 is connected to the transport water tanker; in order to reduce the number of lifts, save energy and reduce consumption.

The front end of the first-level DAF system 10 is connected with the first dosing system 11, and the rear end is provided with a first pH control system 34 and is connected to the MBBR tank 13 and the sludge storage tank 18;

The MBBR tank 13 is located in the combined tank body and is a three-level aerobic tank, each level of aerobic tank is filled with MBBR fillers, each level of water outlet is provided with a water outlet intercepting net 16, and the rear end is connected to the sedimentation tank 17, The bottom of the MBBR tank is provided with a double aeration system of perforated aeration pipes and aeration pans. The aeration system is connected to the second blast system 14, and the dissolved oxygen meter control system 15 is installed in the tank. The second blast system is located on the first floor of the comprehensive workshop. It forms a frequency conversion control system with the dissolved oxygen meter control system 15;

The settling tank 17 is located in the combined tank body, the front end is connected with the MBBR tank 13, and the rear end is connected with the sludge storage tank 18 and the intermediate water tank 24. air lift device;

The intermediate tank 24 is located in the combined tank body, the front end is connected to the sedimentation tank 17, the rear end is connected to the secondary DAF 28, a third lift water pump 25 is arranged in the pool, and a second electromagnetic flow meter 27 is installed on the outlet pipeline of the third lift water pump. , and connected to the front end of the secondary DAF28, in the intermediate pool 24, a third liquid level control system 26 is set, which is consistent with the automatic control system of the second lifting pump 7;

The front end of the secondary DAF28 is connected to the third dosing system 29, and the rear end is provided with a second pH control system 35, which is connected to the precision filter 30 and the sludge storage tank 18;

The precision filter 30 is located on the first floor of the comprehensive workshop and is connected to the UF+RO system 31 located on the first floor of the comprehensive workshop. The precision filter 30 and the UF+RO system 31 are connected to the filtrate pool 36 located outdoors, and the filtrate pool 36 It is completely underground, located next to the combined tank, and the rear end is connected to the adjustment tank 6. The tank is provided with a filtrate lift pump 37 and a fourth liquid level control system 38. The liquid level control is divided into low level, high level and high level. The sludge tank 32 is located at In the combined tank, the rear end is connected to the sludge storage tank 18, and there is a sludge lift pump 33 in the tank. With the snail dehydrator 21, the front end of the snail dehydrator is connected to the third dosing system 20, and the rear end is connected to the sludge tank 22. The sludge tank 22 is installed on the second floor of the comprehensive workshop, and there is space for a transport vehicle 23 on the first floor.

The present invention further discloses a method for using a low-energy-consumption high-concentration organic food waste water treatment device for treatment, which is characterized in that the process is carried out according to the following steps:

(1) The waste water in the production workshop is pretreated by the front-end grille and oil separator, and then lifted into the water inlet 1 and discharged into the adjustment tank 6. When an accident occurs in the front-end production and the water quality changes greatly, the waste water is discharged into the accident through valve adjustment. Storage tank 2, the first lifting water pump 3 is set in the accident storage tank, which is pumped into the regulating tank 6 quantitatively to dilute the accident water. Accident discharge port 4 outbound vehicles, transported to the relevant sewage treatment plant for treatment.

(2) The adjustment tank 6 is provided with a second lift water pump 7, which is controlled by the second liquid level control system 8 to automatically start and stop. A first electromagnetic flowmeter 9 is installed on the pipeline of the second lift water pump 7, and the flow rate is designed Raised to Level 1 DAF10.

(3) In order to facilitate the direct self-flow of the effluent after treatment to the next-level treatment system, the number of lifting stages is reduced, and the running power is reduced. The first-class DAF10 is installed on the second floor of the comprehensive workshop, and the water level is higher than the outdoor pool. The front end of the first-level DAF10 is dosed by the first dosing system 11. The chemicals are alkali, flocculant and coagulant. The types of chemicals can be selected and adjusted through the experiment during the commissioning period. The alkali refers to NaOH, and the dosage is 50g/m3 ^3. The flocculant refers to PAM anion, namely polyacrylamide, and the dosage is 0.5 g/m ³ . The coagulant refers to PAC, that is, polyaluminum chloride, and the dosage is 50 g/m ^3. The first-level DAF10 is set The main purpose is to remove the high content of suspended solids in the water and do pretreatment for the subsequent oxidation system. The wastewater is discharged into the MBBR tank 13 after the first-level DAF10 pretreatment. The MBBR tank 13 is divided into three levels, and the effluent end of each level is The effluent water is filtered by the effluent intercepting net 16 to prevent the MBBR filler from being discharged into the next-stage tank body with the water, thereby causing the loss of the filler. MBBR fillers have a high specific surface area and are enriched with a large number of microorganisms, which can remove a large amount of organic matter and resist high load impact. The effluent from the MBBR tank 13 is automatically discharged into the sedimentation tank 17, and the density of the packing moving bed biological fluidized bed suspension packing (commercially available) should be 0.97-1.03; it has a large specific surface area, good hydrophilicity, high biological activity, It has the advantages of fast film hanging, good treatment effect and long service life.

(4) In the sedimentation tank 17 , the fallen biofilm is precipitated, and is regularly discharged into the sludge storage tank 18 , and the supernatant is drained into the intermediate water tank 24 by its own flow.

(5) There is a third lifting pump 25 in the intermediate pool 24, as a secondary lifting system in the water treatment process, a third liquid level control system 26 is installed in the pool, and the control requirements are consistent with the automatic control system of the second lifting pump 7, A second electromagnetic flowmeter 27 is installed on the water outlet pipeline of the third lift pump 25 to control the water flow rate and quantitatively lift it into the second-level DAF28 located on the second floor of the comprehensive workshop.

(6) The front end of the secondary DAF28 is dosed by the third dosing system 29. The chemicals are alkali, flocculant and coagulant. The types of chemicals can be selected and adjusted through the experiment during the commissioning period. The main purpose of the secondary DAF28 is to remove aquatic organisms Membrane and other suspended solids, reduce turbidity, and the treated wastewater flows into the precision filter 30 by itself. The alkali refers to NaOH, the dosage is 5g/m ³ , the flocculant is PAM anion, the dosage is 0.05 g/m ³ , and the coagulant is PAC, and the dosage is 5 g/m ³ .

(7) The precision filter 30 uses the siphon principle to realize automatic backwashing, and its purpose is to remove the remaining suspended solids that have not been treated by the secondary DAF28 as a pretreatment system for later advanced treatment. The clean water flows into the UF+RO system 31 behind, the backwash water is discharged into the underground pipe network, and flows into the filtrate tank 36; in the filtrate tank 36, a fourth lifting water pump 37 and a fourth liquid level control system 38 are arranged, and the liquid level Automatically control the start and stop, and lift the waste water to the regulating tank 6 for reprocessing.

(8) The system sludge dewatering adopts the screw dewatering machine 21. The sludge in the sludge storage tank 18 comes from the sludge tank 32, the first-level DAF10 and the second-level DAF28 respectively. The sludge in the sludge tank 32 passes through the sludge lift pump. 33 Lifted to the sludge storage tank 18, the physical and chemical sludge of the first-level DAF10 and the second-level DAF28 can flow into the sludge storage tank 18, and the physical and chemical sludge and biochemical sludge are fully stirred in the sludge storage tank 18, and pass through the sewage sludge. The mud pump 19 is lifted to the screw dehydrator 21; the front end of the screw dehydrator is a coagulation tank, and the flocculant is added in the coagulation pipe through the third dosing system 20. After dehydration, the sludge falls into the sludge tank 22, which is To reduce the labor force and improve the sanitary environment, the sludge tank 22 is installed on the second floor of the comprehensive workshop, and the space for the transport vehicle 23 is left on the first floor, which reduces the sludge occupied workshop area and the sludge transfer link. The dewatered sludge is transported out of the factory by a sludge truck for disposal. The flocculant refers to: PAM cation, and the dosage is 8.3 g/m ³ .

The invention also discloses the application of the treatment method in the treatment of suspended solids, animal and vegetable oils, and organic food wastewater with high salinity. The experimental results show that the effluent after the treatment process can meet the water quality requirements for toilet flushing in the standard of "Urban Wastewater Reuse Water Quality for Urban Miscellaneous Water" (GB/T18920-2002), and realize the reuse of reclaimed water.

Compared with the traditional technology, a low-energy consumption and high-concentration organic food waste water treatment device and method disclosed by the present invention has the following advantages:

1. There is no anaerobic treatment technology in this process, and the biogas generated during the anaerobic treatment process and the potential safety hazards brought by the biogas treatment system do not need to be considered in this technology. Therefore, the security of the system is greatly improved. Acidification is easy to occur during anaerobic operation, which will bring devastating damage to anaerobic bacteria in the system, thereby affecting the stability of the system. Therefore, the present invention does not use anaerobic technology, which greatly improves the stability of the system.

2. The present invention uses MBBR as the filler of the aerobic tank. The filler itself has a large specific surface area, a large amount of biofilm, a variety of microorganisms, a high operating load, a high impact load, and a high removal of organic matter, so the use of this technology can Greatly reduce the volume and floor area of the aerobic pool.

3. The blasting system of the present invention adopts the frequency conversion + dissolved oxygen meter control system, which can adjust the air volume at any time, reduce the power consumption, and greatly save the operation cost. Due to the special process combination, the safety and stability of the sewage treatment system are greatly improved, and the volume and floor space of the tank body are reduced. Due to the extensive use of the automatic control system, the labor force is reduced, the management effect is improved, and the operation cost is saved.

4. In the present invention, the dewatered sludge is placed on the second floor, and a pneumatic valve opening system is set up, leaving a space for the transport vehicle to enter and exit on the first floor, so as to ensure that the sludge can be automatically dropped into the transport vehicle through the control valve when it is full. The traditional operation method greatly reduces the labor force and labor intensity.

5. The present invention adopts a precision filter as the pretreatment process for advanced treatment. Compared with the traditional sand filter, the sand filter has disadvantages such as easy blockage of packing, easy hardening, large amount of backwashing water, and low filtration precision. The present invention selects a precision filter whose medium is anthracite, quartz sand and other multi-layer composite fine filter materials. The filter uses the siphon principle to automatically adjust the backwash cycle according to the dirt content of the filter layer to realize automatic backwash. The filter does not need valves for inlet and outlet, flushing and drainage, and it operates automatically by hydraulic action. While making up for the shortcomings of the sand filter, it reduces energy consumption and saves operating costs.

6. The present invention utilizes two sets of blast aeration systems to supply the MBBR tank, the adjustment tank, the accident storage tank, the sludge storage tank and other air-demanding places respectively, which ensures the oxygen supply stability of the MBBR aerobic tank.

7. The process of the present invention can treat high-concentration organic food waste water, and the effluent index meets the water quality requirements for toilet flushing in the standard of "Urban Wastewater Reuse Water Quality for Urban Miscellaneous Water" (GB/T18920-2002), realizes comprehensive utilization of reclaimed water, and creates Good economic and environmental benefits.

Description of drawings

Fig. 1 is a kind of low-energy consumption high-concentration organic food waste water treatment device structure schematic diagram; Wherein:

1-Water inlet, 2-Accident storage tank, 3-First lift water pump, 4-Accident discharge port, 5-First liquid level control system,

6-Regulation tank, 7-Second lifting water pump, 8-Second liquid level control system, 9-First electromagnetic flowmeter,

10-first-level DAF, 11-first dosing system, 12-first blowing system, 13-MBBR pool,

14- The second blowing system, 15- Dissolved oxygen meter control system, 16- Outlet interception net, 17- Sedimentation tank,

18-Sludge storage tank, 19-Sludge pump, 20-Second dosing system, 21-Screw dehydrator, 22-Sludge tank,

23-Transporter, 24-Intermediate pool, 25-Third lift water pump, 26-Third liquid level control system,

27-Second electromagnetic flowmeter, 28-Secondary DAF, 29-Third dosing system, 30-Precision filter,

31-UF+RO system, 32-sludge tank, 33-sludge lift pump, 34-first pH control system,

35- The second pH control system, 36- The filtrate tank, 37- The filtrate lift pump, 38- The fourth liquid level control system.

Detailed ways

The present invention is described below through specific embodiments. Unless otherwise specified, the technical means used in the present invention are methods known to those skilled in the art. In addition, the embodiments should be construed as illustrative rather than limiting the scope of the present invention, and the present invention will be further described in detail below in conjunction with specific embodiments.

Example 1

A low-energy-consumption and high-concentration organic food waste water treatment device, which includes a water inlet 1, a regulating tank 6, a first-level DAF10, an MBBR tank 13, a sedimentation tank 17, an intermediate tank 24, a second-level DAF28, a precision filter 30, UF+RO System 31; wherein the water inlet 1 is connected to the adjustment tank 6 and the accident storage tank 2 respectively, and the adjustment tank 6 is located outdoors, and the accident storage tank 2, the MBBR tank 13, the sedimentation tank 17, the intermediate tank 24, and the sludge tank 32 form a combined tank together body;

The rear side of the regulating tank is connected with the first-level DAF10, the MBBR tank 13, the sedimentation tank 17, the intermediate water tank 24, the second-level DAF28, the precision filter 30, and the UF+RO system 31 in turn; the first-level DAF10 and the second-level DAF28 are located in the comprehensive workshop. 2nd Floor;

A perforated aeration pipe is arranged at the bottom of the adjustment tank, and the perforated aeration pipe is connected to the first blowing system 12. A second lifting water pump 7 is arranged inside the tank body of the adjustment tank, and a first electromagnetic flowmeter 9 is connected to the water outlet pipeline of the second lifting water pump. Then it is connected to the first-level DAF10. In the adjustment tank, a second liquid level control system 8 is set up. The liquid level control is divided into low level, high level and high level. The accident storage tank 2 is adjacent to the adjustment tank 6. The connection has two directions, namely the adjustment tank and the accident discharge port 4. The accident storage tank is provided with a first lift pump 3 and a first liquid level control system 5. The first lift water pump is connected to the adjustment tank and the accident discharge port. The port is connected to the transport water tanker.

The front end of the first-level DAF10 is connected with the first dosing system 11, and the rear end is provided with a first pH control system 34 and is connected to the MBBR tank 13 and the sludge storage tank 18; , pretreatment for the subsequent oxidation system.

The MBBR tank 13 is located in the combined tank body and is a three-level aerobic tank, each level of aerobic tank is filled with MBBR fillers, each level of water outlet is provided with a water outlet intercepting net 16, and the rear end is connected to the sedimentation tank 17, The bottom of the MBBR tank is provided with a double aeration system of perforated aeration pipes and aeration pans. The aeration system is connected to the second blast system 14, and the dissolved oxygen meter control system 15 is installed in the tank. The second blast system is located on the first floor of the comprehensive workshop. It forms a frequency conversion control system with the dissolved oxygen meter control system;

The settling tank 17 is located in the combined tank body, the front end is connected with the MBBR tank, and the rear end is connected with the sludge storage tank 18 and the intermediate water tank 24. lifting device;

The intermediate tank 24 is located in the combined tank body, the front end is connected to the sedimentation tank 17, and the rear end is connected to the secondary DAF system 28. A third lift pump 25 is provided in the pool, and a second electromagnetic flow rate is installed on the outlet pipe of the third lift pump. The meter 27 is connected to the front end of the secondary DAF system 28, and in the intermediate tank 24, the third liquid level control system 26 is set to be consistent with the automatic control system of the second lift water pump 7;

The front end of the secondary DAF28 is connected to the third dosing system 29, and the back end is provided with a second pH control system 35, which is connected to the precision filter 30 and the sludge storage tank 18; the purpose of the secondary DAF system 28 is to remove the MBBR The biofilm that falls off in the water after the pool reduces the turbidity of the water and prepares the pretreatment for the subsequent advanced treatment system.

The precision filter is located on the first floor of the comprehensive workshop and is connected to the UF+RO system 31 which is also located on the first floor of the comprehensive workshop. The precision filter and the UF+RO system are connected to the filtrate pool 36 located outdoors, and the filtrate pool is completely underground. , located next to the combined tank, and the rear end is connected to the adjustment tank. The tank is provided with a filtrate lift pump 36 and a fourth liquid level control system 37. The liquid level control is divided into low level, high level and high high level. The sludge tank 32 is located in the combined tank. It is connected to the sludge storage tank 18, and there is a sludge lift pump 33 in the tank. The front end of the sludge storage tank is respectively connected with the sludge tank, the first-level DAF and the second-level DAF, and the rear end is connected with the sludge pump 19 and the screw dehydrator 21 in turn. The front end of the screw dehydrator is connected to the third dosing system 20, and the back end is connected to the sludge tank 22. The sludge tank 22 is installed on the second floor of the comprehensive workshop, and there is space for a transport vehicle 23 on the first floor.

Example 2

The method of using low energy consumption and high concentration organic food waste water treatment device for treatment, taking the treated water volume of 250m ³ /d as an example:

(1) The waste water of the production workshop is automatically discharged into the water collecting well outside the workshop through the workshop trench. The front end of the water collecting well is equipped with an automatic fine grille to remove large-sized suspended solids, and then flows into the three-grid grease trap to clean up the animal and vegetable oils in the water. The rear end is provided with a lift pump, which is lifted into the water inlet 1 and discharged into the rear end sewage treatment system. In general, the waste water is directly discharged into the adjustment tank 6, and normally enters the subsequent process for treatment; if there is an accident in the production at the front end, if there is a large amount of production When the raw materials are discharged, the water quality and quantity change greatly. At this time, the waste water can be manually adjusted through the valve to discharge the waste water into the accident storage tank 2. The first lifting water pump 3 is set in the accident storage tank, and the pump is lifted and quantitatively driven into the adjustment tank 6, so as to adjust the The accident water is diluted. If the processing capacity cannot meet the accident drainage requirements, the first lifting pump 3 is used to lift it to the accident discharge port 4 to transport vehicles and transport it to the relevant sewage treatment plant for treatment. The design of the adjustment tank and the accident storage tank The capacity is 125m ³ and the hydraulic retention time is 12 hours.

(2) The adjustment tank 6 is provided with a second lifting water pump 7, and the liquid level is controlled by the second liquid level control system 8. The liquid level controller is an ultrasonic liquid level gauge, which starts and stops automatically. The pipeline of the second lifting water pump 7 is installed The first electromagnetic flowmeter 9, the control flow rate of the electromagnetic flowmeter is 10.5m ³ /h, operates according to the design flow rate, and is upgraded to the first-level DAF10.

(3) In order to facilitate the direct self-flow of the effluent after treatment to the next-level treatment system, the number of lifting stages is reduced, and the running power is reduced. The first-class DAF10 is installed on the second floor of the comprehensive workshop, and the water level is higher than the outdoor pool. The main purpose of the first-stage DAF10 setting is to remove the higher content of suspended solids in the water, and to do a good job of pretreatment for the subsequent oxidation system. The front end is dosed by the first dosing system 11. The drugs are NaOH, PAM anion and PAC (the dosage is 525g/h, 5.25g/h and 525g/h respectively). In order to ensure the stable operation of the system, the first-level DAF is selected. The method is high-efficiency air flotation, and the design flow rate is 15m ³ /h, which is greater than the design water inflow. After passing through the first-level DAF, the COD index of the wastewater is reduced from 3440mg/L to 1370mg/L, and the removal rate can reach 60%. The wastewater is discharged into the MBBR tank 13 after being pretreated by the first-level DAF10.

(4) The MBBR pool 13 is divided into three levels, and the water outlet end of each level uses the water outlet intercepting net 16 to filter the effluent, so as to prevent the MBBR filler from being discharged into the next-level pool body with the water, thereby causing the loss of the filler. MBBR packing has a high specific surface area. The moving bed biological fluidized bed suspension packing (commercially available) with a specific surface area of 625m ² /m ³ is selected. The filling degree is 30% and the usage amount is 255m ³ . During operation, it is adjusted according to the concentration of the influent water. , which is enriched with a large number of microorganisms, capable of removing a large amount of organic matter, and resistant to high load impact. From the front to the back of the three pools, the organic pollution concentration gradually decreases, and the gas demand also gradually decreases. The intake volume is controlled according to the dissolved oxygen meter control system 15 and the valve. After this process section, the COD index of the wastewater drops from 1370mg/L to 80mg/L, the pollutant removal rate is close to 95%, and the effluent from the MBBR tank 13 flows into the sedimentation tank 17.

(5) In the sedimentation tank 17, the fallen biofilm is precipitated. A sludge hopper is arranged at the bottom of the sedimentation tank, the slope of the sludge hopper is not less than 55°, and an air stripping device is arranged in the sludge hopper. The outflow of sludge is controlled and discharged into the sludge storage tank 18 on a regular basis. The supernatant liquid of the sedimentation tank flows into the intermediate tank 24 through the four-sided outlet weirs to collect water.

(6) There is a third lifting pump 25 in the intermediate pool 24, which is used as a secondary lifting system in the water treatment process. A third liquid level control system 26 is installed in the pool. The liquid level controller is an ultrasonic level gauge, which automatically starts and stops. , the control requirements are consistent with the automatic control system of the second lift pump 7, the second electromagnetic flowmeter 27 is installed on the water outlet pipeline of the third lift pump 25 to control the flow of water, and the flow rate of the electromagnetic flowmeter is still controlled at 10.5m ³ /h, Elevate into Level 2 DAF28 located on the second floor of the integrated workshop.

(7) The front end of the secondary DAF28 is dosed by the third dosing system 29. The agents are NaOH, PAM anion, PAC and (the dosage are 52.5g/h, 0.525g/h and 52.5g/h respectively), and the agents are The type can be selected and adjusted through the test during the commissioning period. The main purpose of the secondary ^DAF28 is to remove suspended solids such as biofilms in water and reduce turbidity. The selection method of the secondary DAF is high-definition air flotation. h, after this process section, the COD index of the wastewater is reduced from 80mg/L to 35mg/L, the pollutant removal rate is 58%, and the treated wastewater flows into the precision filter 30 by itself.

(8) The precision filter 30 is located on the first floor of the comprehensive workshop. The installation height meets the needs of the self-flow of wastewater from the secondary DAF to the precision filter. The precision filter uses the siphon principle to realize automatic backwashing. Treat the clean remaining suspended solids as a pretreatment system for post-processing. After this process section, the COD index of the waste water drops from 35mg/L to 30mg/L, the pollutant removal rate reaches 15%, the clean water flows into the UF+RO system 31 behind, and the backwash of the precision filter and UF+RO system The water and the drainage of other facilities in the comprehensive workshop are all discharged into the underground pipe network, and flow into the filtrate tank 36; in the filtrate tank 36, a fourth lifting pump 37 and a fourth liquid level control system 38 are installed, and the start and stop are automatically controlled by the liquid level. , the wastewater is lifted to the adjustment tank for secondary treatment.

(9) Sludge dewatering adopts screw dehydrator 21, and sludge storage tank 18 is located on the first floor of the comprehensive workshop. In order to ensure the sanitation of the labor environment, a stench gas collecting hood is installed on the tank body, and the air is discharged to the outside for treatment. The sludge in the tank comes from the sludge tank 32, the first-level DAF10 and the second-level DAF28 respectively. The sludge in the sludge tank 32 is lifted to the sludge storage tank 18 by the sludge lift pump 33, and the physical and chemical pollutants of the first-level DAF10 and the second-level DAF28 are The sludge can flow into the sludge storage tank 18 by itself, and the physicochemical sludge and biochemical sludge are fully stirred in the sludge storage tank 18 using an air stirring device, and are lifted to the screw dehydrator 21 by the sludge pump 19; The type is screw pump, the front end of the screw dehydrator is a coagulation tank, and PAM cation (the dosage is 8.3g/m ³ ) is added to the coagulation pipe through the third dosing system 20. After dehydration, the sludge falls to the sludge tank In 22, the moisture content of the sludge after dewatering can reach 80%, which meets the requirements of outbound transportation; in order to reduce labor and improve the sanitary environment, the sludge tank 22 is welded with stainless steel and installed on the second floor of the comprehensive workshop, and the first floor is reserved for transportation 23 space in the truck, which reduces the workshop area occupied by the sludge and the sludge transfer link. The dewatered sludge is transported out of the plant through the sludge truck for disposal.

Example 3

As shown in the attached drawings, a low-energy consumption and high-concentration organic food wastewater treatment device includes 1, a water inlet 6, a regulating tank 10, a first-level DAF13, an MBBR tank 17, a sedimentation tank 24, an intermediate tank 28, a second-level DAF30, a precision Filter 31, UF+RO system. The regulating tank 6 is connected to the first-level DAF10, the MBBR tank 13, the sedimentation tank 17, the intermediate water tank 24, the second-level DAF28, the precision filter 30, and the UF+RO system 31 in sequence.

The workshop wastewater is lifted to the sewage treatment system through the pipeline inlet 1. Under the normal production of the workshop, the water quality of the drainage is relatively stable. At this time, the wastewater can be discharged into the adjustment tank 6. When the water quality of the workshop wastewater is unstable, it can be controlled by the terminal valve. , and discharge the drainage to accident storage tank 2. A first lift pump 3 is arranged in the accident storage tank 2, and a perforated aeration pipe is arranged at the bottom to homogenize water quality. The accident water can be lifted to the adjustment tank 6 by the first lifting pump 3 and the homogenized waste water can be homogenized in a certain proportion. It is transported to the designated sewage treatment plant for treatment, and the first liquid level control system 5 is set in the pool, which can automatically control the start and stop of the water pump.

The inner bottom of the adjustment tank 6 is provided with a perforated aeration pipe, which supplies air through the first air blast system 12, and is also provided with a second lift water pump 7. A first electromagnetic flowmeter 9 is installed to lift the water to the front end of the first-level DAF10. In order to realize the automatic management of sewage operation, a second liquid level control system 8 is installed in the regulating tank 6. The liquid level control is divided into low level, high level and high level. , the water pump automatically stops when the low position is low, the water pump is turned on when the high position is high, and the two water pumps are turned on at the same time when the high and high position is high and an alarm is performed. The setting of the automatic control system realizes unattended automatic management. Reduced labor force.

The purpose of the first-level DAF10 is to remove the high content of suspended solids in the water, and to do a good job of pretreatment for the subsequent aerobic system. The first pH control system 34 is set at the end, which can realize the pH control display and adjust the dosage in time. After air flotation, the clean water is discharged into the MBBR tank 13 , and the upper materialized sludge is discharged into the sludge storage tank 18 .

MBBR pool 13 is a three-stage aerobic pool, each stage of aerobic pool is filled with MBBR filler, the filling rate of the filler is 30%-50%, and the water outlet intercepting net 16 is set at each level of water outlet to prevent the filler from overflowing with water The bottom of the pool is provided with a double aeration system of perforated aeration pipes and aeration discs to ensure uniform aeration. The blower system 14 is controlled by frequency conversion, and the air supply volume is adjusted by the dissolved oxygen data, so as to avoid excessive air supply by the blower to the greatest extent, resulting in waste, thereby saving running power. The MBBR pool 13 is the core system with the largest pollution load removal in the patent of the present invention, so the operation effect of the system directly affects the effluent quality.

The effluent from the MBBR tank 13 flows into the sedimentation tank 17 , the tank body is filled with inclined pipe fillers, and a sludge hopper is arranged at the lower part.

The intermediate water tank 24 is provided with a third lift pump 25. In order to ensure the stability of the water inlet flow of the subsequent system, an electromagnetic flowmeter 27 is installed on the outlet pipeline of the third lift pump 25 to lift the water to the front end of the secondary DAF28, in order to realize sewage operation. Automatic management. In the middle pool 24, a liquid level control system 26 is set. The liquid level control is divided into low level, high level and high and high level. The water pump automatically stops when the low level is low, and the water pump is turned on when the high level is high. When the high and high levels are two pumps are turned on at the same time and alarm . It is consistent with the automatic control system of the former second lift water pump 7.

The purpose of the secondary DAF system 28 is to remove the biofilm that falls off the water after passing through the MBBR tank, reduce the turbidity of the water, and prepare the pretreatment for the subsequent advanced treatment system. It is coagulated with PAM anions and other pharmaceuticals, and the second pH control system 35 is set at the back end, which can realize the central control display of pH and adjust the dosage in time. After passing through air flotation, clean water is discharged into the precision filter 30 , and the upper materialized sludge is discharged into the sludge storage tank 18 .

The precision filter 30 is a valveless filter, and a precision filter with a multi-layer composite fine filter material such as anthracite and quartz sand is selected as the medium. Automatic backwash. The effluent enters the subsequent advanced treatment system UF+RO system 31, and the backwash water is discharged into the filtrate tank 36 through the underground pipe network.

The filtrate tank 36 receives the backwash water of the precision filter 30, the supernatant liquid drainage of the sludge tank 17 and the drainage of other equipment in the comprehensive workshop. There is a filtrate lift pump 37 and a fourth liquid level control system 38. The liquid level control is divided into low level, high level and high and high level. The water pump automatically stops when the low level is low, and the water pump is turned on when the high level is high. When the high and high levels are two pumps are turned on at the same time and alarm.

The sludge storage tank 18 accommodates the biochemical sludge from the sludge tank 24 and the physical and chemical sludge from the two-stage DAF, and the sludge is discharged into the screw dewatering machine 21 through the sludge pump 19 .

The front end of the screw dewatering machine 21 is a sludge dosing and mixing system. PAM cations are added through the dosing system 20. After dehydration, the dry sludge automatically falls into the sludge tank 22. The sludge tank 22 is installed on the second floor, and the first floor stays. There is space for 23 transport vehicles, and the process design greatly improves the mud discharge effect and reduces labor intensity.

Example 4

Compared with the traditional "anaerobic + aerobic" method, the low-energy consumption and high-concentration organic food wastewater treatment device and method disclosed in the present invention has the following benefits:

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. , without departing from the spirit and scope of the present invention, many modifications can be made, which all belong to the protection of the present invention.

Claims (3)

1. A low-energy-consumption high-concentration organic food waste water treatment device, characterized in that it comprises a water inlet (1), a regulating tank (6), a first-level DAF (10), a MBBR tank (13), a sedimentation tank (17), The intermediate pool (24), the secondary DAF (28), the precision filter (30), and the UF+RO system (31); wherein the workshop wastewater is connected to the two pools through the pipeline water inlet (1), which are respectively connected with the regulating pool ( 6) and the accident storage tank (2); the adjustment tank (6) is located outdoors, together with the accident storage tank (2), the MBBR tank (13), the sedimentation tank (17), the intermediate water tank (24), and the sludge tank (32). form a combined pool; The regulating tank (6) is followed by a first-level DAF (10), an MBBR tank (13), a sedimentation tank (17), an intermediate water tank (24), a second-level DAF (28), a precision filter (30), The UF+RO system (31) is connected; the first-level DAF (10) and the second-level DAF (28) are located on the second floor of the comprehensive workshop; A perforated aeration pipe is arranged at the inner bottom of the adjustment tank (6), and the perforated aeration pipe is connected to the first blowing system (12). The first electromagnetic flowmeter (9) is connected to the water outlet pipeline, and then connected to the first-level DAF system (10). In the regulating tank, a second liquid level control system (8) is set up. The liquid level control is divided into low level, high level and high level. , the accident storage tank (2) is adjacent to the adjustment tank (6), the front end is connected with the water inlet (1), and the rear end is connected in two directions, namely the adjustment tank (6) and the accident outlet (4), the accident storage tank ( 2) A first lift water pump (3) and a first liquid level control system (5) are arranged inside, and the first lift water pump (3) is connected to the adjustment tank (6) and the accident discharge port (4), and the accident discharge port (4) ) connected to the transport water tanker; The front end of the first-level DAF (10) is connected with the first dosing system (11), and the rear end is provided with a first pH control system (34) and is connected to the MBBR tank (13) and the sludge storage tank (18). The purpose of the DAF system is to remove the high content of suspended solids in the water, and to do a good job of pretreatment for the subsequent oxidation system; The MBBR tank (13) is located in the combined tank body and is a three-level aerobic tank, each level of aerobic tank is filled with MBBR fillers, and each level of water outlet is provided with a water outlet intercepting net (16), and the rear end is connected to The sedimentation tank (17), the bottom of the MBBR tank is provided with a double aeration system of perforated aeration pipes and aeration discs, the aeration system is connected with the second blast system (14), and a dissolved oxygen meter control system (15) is installed in the tank body, The second blowing system (14) is located on the first floor of the comprehensive workshop, and forms a frequency conversion control system with the dissolved oxygen meter control system (15); The sedimentation tank (17) is located in the combined tank body, the front end is connected with the MBBR tank (13), and the rear end is connected with the sludge storage tank (18) and the intermediate water tank (24). sludge hopper, and install sludge air lift device; The intermediate water tank (24) is located in the combined tank body, the front end is connected to the sedimentation tank (17), and the rear end is connected to the secondary DAF (28). A second electromagnetic flowmeter (27) is installed on the water outlet pipeline of the 7) The automatic control system is consistent; The front end of the secondary DAF (28) is connected to the third dosing system (29), the back end is provided with a second pH control system (35), and is connected to the precision filter (30) and the sludge storage tank (18), The purpose of the secondary DAF system is to remove the biofilms that fall off the water after passing through the MBBR tank, reduce the turbidity of the water, and do a good job of pretreatment for the subsequent advanced treatment system; The precision filter (30) is located on the first floor of the comprehensive workshop and is connected to the UF+RO system (31) located on the first floor of the comprehensive workshop. The precision filter (30) and the UF+RO system (31) are connected to the outdoor filter. The filtrate pool (36) is connected, the filtrate pool (36) is completely underground, located next to the combined pool, and the rear end is connected to the adjustment pool (6), and the pool is provided with a filtrate lift pump (37) and a fourth liquid level control system (38) , the liquid level control is divided into low level, high level and high level; the sludge tank (32) is located in the combined tank, the back end is connected to the sludge storage tank (18), and there is a sludge lift pump (33) in the tank; the sludge storage tank (18) ) The front end is connected to the sludge tank (32), the first-level DAF (10), and the second-level DAF (28) respectively, and the rear end is connected to the sludge pump (19) and the screw dehydrator (21) in turn; It is connected to the third dosing system (20), and the back end is connected to the sludge tank (22). The sludge tank (22) is installed on the second floor of the comprehensive workshop, and there is space for the transport vehicle (23) on the first floor. 2. adopt the described low-energy-consumption high-concentration organic food waste water treatment device of claim 1 to process the method, it is characterized in that carrying out according to the following steps: 1) The waste water in the production workshop is pretreated by the front-end grille and oil separator, and then lifted into the water inlet (1) and discharged into the adjustment tank (6). Into the accident storage tank (2), the first lifting water pump (3) is set in the accident storage tank, and is gradually pumped into the adjustment tank (6) by the pump to dilute the accident water. If the processing capacity cannot meet the accident drainage requirements, then Use the first lift pump (3) to lift it to the accident discharge outlet (4) to transport the vehicle to the relevant sewage treatment plant for treatment; 2) The regulating tank (6) is provided with a second lifting water pump (7), the liquid level is controlled by the second liquid level control system (8), and automatically starts and stops, and a first solenoid is installed on the pipeline of the second lifting water pump (7). The flow meter (9), according to the design flow, is upgraded to the first-level DAF (10); 3) In order to facilitate the direct self-flow of the effluent after treatment to the next-level treatment system, reduce the number of lifting stages, and reduce the operating power, the first-level DAF (10) is installed on the second floor of the comprehensive workshop, and the water level is higher than the outdoor pool body, and the first-level DAF ( 10) The main purpose of the setting is to remove the high content of suspended solids in the water and do pretreatment for the subsequent oxidation system. The front end of the first-level DAF (10) is added by the first dosing system (11), and the agents are alkali, flocculation, respectively. The type of agent can be selected and adjusted through the experiment during the commissioning period. The alkali refers to NaOH, and the dosage is 50g/m ³ . The flocculant refers to PAM anion, and the dosage is 0.5 g/m ³ . The coagulant refers to PAC, and the dosage is 50g/m ³ . The wastewater is pretreated by the first-level DAF (10) and then drained into the MBBR tank (13). The MBBR tank (13) is divided into three levels, and each level is effluent The effluent intercepting net (16) is used at both ends to filter the effluent to prevent the MBBR filler from being discharged into the next-stage tank body with water, thereby causing the loss of the filler. The MBBR filler has a high specific surface area and is enriched with a large number of microorganisms, which can remove a large amount of organic matter. And resistant to high load impact, the MBBR tank (13) effluent is automatically discharged into the sedimentation tank (17), the filler refers to: moving bed biological fluidized bed suspension filler, the density of the filler is 0.97-1.03; 4) In the sedimentation tank (17), the fallen biofilm is sedimented, and is regularly discharged into the sludge storage tank (18), and the supernatant is drained into the intermediate water tank (24); 5) There is a third lift pump (25) in the intermediate pool (24), as a secondary lift system in the water treatment process, a third liquid level control system (26) is installed in the pool, and the control requirements are the same as the second lift pump ( 7) The automatic control system is consistent, and a second electromagnetic flowmeter (27) is installed on the water outlet pipeline of the third lifting pump (25) to control the water flow and quantitatively lift it into the second-level DAF (28) located on the second floor of the comprehensive workshop; 6) The front end of the secondary DAF (28) is dosed by the third dosing system (29). The chemicals are alkali, flocculant and coagulant. The types of chemicals can be selected and adjusted through the debugging period experiment. The secondary DAF (28) The main purpose is to remove suspended solids such as biofilms in the water, reduce turbidity, and the treated wastewater flows into the precision filter (30); the alkali refers to NaOH, the dosage is 5g/m ³ , and the flocculant refers to PAM anion , the dosage is 0.05 g/m ³ , the coagulant refers to PAC, and the dosage is 5 g/m ³ ; 7) The precision filter (30) uses the siphon principle to realize automatic backwashing, and its purpose is to remove the remaining suspended solids that have not been cleaned by the secondary DAF (28) as a pretreatment system for later advanced treatment. In the UF+RO system (31), the backwash water is discharged into the underground pipe network and flows into the filtrate tank (36); the filtrate tank (36) is provided with a fourth lift pump (37) and a fourth liquid level control system (38) ), automatically control the start and stop of the liquid level, and lift the waste water to the regulating tank (6) for reprocessing; 8) The system sludge dewatering adopts the screw dehydrator (21). The sludge in the sludge storage tank (18) comes from the sludge tank (32), the first-level DAF (10), and the second-level DAF (28). The sludge in the sludge tank (32) is lifted to the sludge storage tank (18) by the sludge lift pump (33), and the physicochemical sludge of the first-level DAF (10) and the second-level DAF (28) can flow into the sludge storage tank by itself (18), the physicochemical sludge and biochemical sludge are fully stirred in the sludge storage tank (18), and are lifted to the screw dehydrator (21) by the sludge pump (19); the front end of the screw dehydrator is coagulation The flocculant is added to the coagulation pipe through the third dosing system (20), and the sludge falls into the sludge tank (22) after dehydration. In order to reduce labor and improve the sanitary environment, the sludge tank (22) is installed in The second floor of the comprehensive workshop and the first floor have space for transport vehicles (23). The dewatered sludge is transported out of the plant for disposal by the sludge truck; the flocculant refers to: PAM cation, and the dosage is 8.3g/m ³ . 3. The application of the treatment method according to claim 2 in the treatment of suspended solids, animal and vegetable oils, and organic food waste water with higher salinity.

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