CN216550012U - Advanced denitrification treatment system for kitchen waste wastewater - Google Patents
Advanced denitrification treatment system for kitchen waste wastewater Download PDFInfo
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- CN216550012U CN216550012U CN202120634906.4U CN202120634906U CN216550012U CN 216550012 U CN216550012 U CN 216550012U CN 202120634906 U CN202120634906 U CN 202120634906U CN 216550012 U CN216550012 U CN 216550012U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The utility model discloses a kitchen waste wastewater deep denitrification treatment system which comprises a regulating tank, a primary A/O system, an intermediate sedimentation tank, a secondary A/O system, an MBR and a total nitrogen deep treatment device, wherein the regulating tank is sequentially connected and is used for carrying out water quality and water quantity equalization on wastewater generated by centrifugal dehydration after anaerobic fermentation of kitchen waste and other production wastewater, the primary A/O system is used for carrying out COD (chemical oxygen demand), ammonia nitrogen and total nitrogen degradation on the wastewater equalized by the regulating tank, the intermediate sedimentation tank is used for carrying out mud-water separation and dissolved oxygen removal on primary degradation mixed liquid obtained by the primary A/O system, the secondary A/O system is used for carrying out secondary total nitrogen removal on clear liquid obtained by separation of the intermediate sedimentation tank, the MBR is used for carrying out mud-water separation on mixed liquid subjected to secondary total nitrogen removal by the secondary A/O system, and the total nitrogen deep treatment device is used for carrying out deep total nitrogen removal on the clear liquid obtained by the MBR. The utility model overcomes the defects of high total nitrogen of the kitchen waste wastewater, difficult stable standard reaching of the total nitrogen of the effluent and the like, and realizes the purpose of stable standard reaching of the total nitrogen and COD of the effluent.
Description
Technical Field
The utility model belongs to the technical field of environmental protection, and particularly relates to a deep denitrification treatment system for kitchen waste and wastewater.
Background
Kitchen waste, commonly known as swill, also known as swill and hogwash, is a domestic waste formed in the process of domestic consumption by residents, is extremely easy to rot and deteriorate, emits foul smell, and spreads bacteria and viruses. The main components of the kitchen waste comprise rice and flour food residues, vegetables, animal and vegetable oil, meat and bones and the like, and the kitchen waste comprises starch, cellulose, protein, lipid and inorganic salt in terms of chemical composition. The kitchen waste is mainly characterized by rich organic matter content, high water content and easy decay, the properties and smell of the kitchen waste can cause bad influence on environmental sanitation, and harmful substances such as pathogenic microorganisms, mycotoxin and the like can be easily grown.
Due to the diet culture and the dinner gathering habit, the kitchen waste becomes a unique phenomenon in China. The Chinese dining table is extremely wasteful, and generates a huge amount of kitchen waste every day. From the number of developing reform Commission in Beijing, which produces 1200 tons of kitchen waste per day. Statistical data of the pollution control and resource research institute of the environment system solid waste of Qinghua university show that the quantity of kitchen waste generated in China per year is not less than 6000 million tons. The data show that the kitchen waste is not less than 6000 million tons per year in China cities. The wastewater generated by anaerobic fermentation and dehydration of the kitchen waste slurry and wastewater generated by other processes of kitchen waste treatment are complex in components, and belong to high-concentration organic wastewater with high treatment difficulty. The wastewater has high pollutant concentration, chemical oxygen demand (COD, 8000-20000 mg/l), biochemical oxygen demand (BOD5, 4000-8000 mg/l), total nitrogen (TN, 2000-3500 mg/l), ammonia nitrogen (NH3-N, 1500-3000 mg/l), total phosphorus (TP, 50-150 mg/l), suspended matters (SS, >8000mg/l), salt content (15000-30000 mg/l), animal and vegetable oil (800-1500 mg/l) and chromaticity (300-1000 times). The proportion of cellulose, protein, lipid and other organic substances which are difficult to biodegrade in the wastewater is large, the carbon-nitrogen ratio (BOD5: TN) is low and is only 2: 1-3: 1, and the low carbon-nitrogen ratio of the wastewater is not beneficial to effectively removing total nitrogen.
At present, the kitchen wastewater treatment mainly adopts a process route combining several or more process units such as anaerobic biological treatment, aerobic biological treatment, membrane technology treatment and the like. The kitchen waste water after treatment should reach the standard of Water quality Standard for Sewage discharge into urban sewers (GB/T31962-2015). At present, the effluent of biogas slurry treatment in a kitchen project is discharged into a municipal pipe network and has total nitrogen index requirement (70mg/L), the effluent execution standard of leachate of a domestic garbage landfill also has total nitrogen requirement, and the standard reaching of the total nitrogen is the key for the standard reaching discharge of the biogas slurry in the kitchen.
SUMMERY OF THE UTILITY MODEL
Aiming at various defects in the prior art and solving the problems, the advanced denitrification treatment system for the kitchen waste wastewater is provided so as to optimize the heterotrophic denitrification process, improve the denitrification efficiency of the heterotrophic denitrification process and reduce the running cost of the heterotrophic denitrification process, and the autotrophic denitrification advanced denitrification process is arranged after the MBR produces water so as to ensure that the treated biogas slurry can reach the standard and be discharged.
In order to achieve the purpose, the utility model provides the following technical scheme:
the deep denitrification treatment system for the kitchen waste wastewater comprises a regulating tank, a primary A/O system, an intermediate sedimentation tank, a secondary A/O system, an MBR membrane system and a total nitrogen deep treatment device, wherein the regulating tank is used for balancing the quality and the quantity of water in wastewater and other production wastewater generated by centrifugal dehydration after anaerobic fermentation of the kitchen waste, the primary A/O system is used for degrading COD, ammonia nitrogen and total nitrogen in the wastewater balanced by the regulating tank, the intermediate sedimentation tank is used for carrying out mud-water separation and dissolved oxygen removal on primary degraded mixed liquid obtained by the primary A/O system, the secondary A/O system is used for carrying out secondary total nitrogen removal on clear liquid obtained by separation in the intermediate sedimentation tank, the MBR membrane system is used for carrying out mud-water separation on the mixed liquid obtained by secondary total nitrogen removal in the secondary A/O system, and the total nitrogen deep treatment device is used for carrying out deep removal on the clear liquid obtained by MBR.
Furthermore, a total nitrogen online monitoring device for monitoring total nitrogen data in clear liquid at the water outlet of the intermediate sedimentation tank in real time and an additional carbon source adding device for adding a carbon source to the tank A in the secondary A/O system according to the total nitrogen data detected by the total nitrogen online monitoring device are arranged at the water outlet of the intermediate sedimentation tank.
Furthermore, an alkalinity on-line monitoring instrument is arranged at the water inlet end of the total nitrogen advanced treatment device, and the alkalinity required to be consumed by the total nitrogen advanced treatment device is automatically controlled and supplemented through the alkalinity on-line monitoring instrument and the alkalinity dosing device.
Further, the device also comprises an intermediate water tank positioned between the MBR membrane system and the total nitrogen advanced treatment device.
Furthermore, the total nitrogen advanced treatment device comprises an autotrophic denitrification filter tank, and a filter material of the autotrophic denitrification filter tank is an autotrophic nitrogen removal filter material.
Furthermore, the total nitrogen advanced treatment device also comprises a water and gas distribution device which is matched with the autotrophic denitrification filter tank for use, and the water and gas distribution device is a filter brick.
Further, a filter used for ensuring the accuracy of online detection data of the total nitrogen online monitoring equipment is arranged between the intermediate sedimentation tank and the total nitrogen online monitoring equipment.
Furthermore, a lifting water pump for lifting the wastewater balanced in the regulating tank into the primary A/O system is arranged between the regulating tank and the primary A/O system.
Advantageous effects
The advanced denitrification treatment system for the kitchen waste wastewater provided by the utility model solves the problems of difficulty in reaching the total nitrogen of the kitchen waste wastewater to the standard, high operation cost and the like, and has the following beneficial effects compared with the prior art:
(1) after the intermediate sedimentation tank is arranged between the first-stage A/O system and the second-stage A/O system, the working conditions of the first-stage A/O system and the second-stage A/O system can be independently controlled, and the adjustment of the total nitrogen removal capacity and efficiency of each stage is facilitated.
(2) And a total nitrogen online monitoring device is arranged at the water inlet end of the secondary A/O system, and the accurate addition and the efficient utilization of an external carbon source are realized through a PLC (programmable logic controller).
(3) The rear end of MBR water production is provided with a total nitrogen advanced treatment device, and the preferred autotrophic upflow denitrification filter does not need an additional carbon source, so that the impact resistance is strong, and the quality of effluent water is stable.
(4) The autotrophic denitrification filter does not need an additional carbon source, has low operation cost and does not have the risk of COD exceeding standard caused by adding the carbon source.
(5) The alkalinity on-line monitoring instrument is arranged at the water inlet end of the total nitrogen advanced treatment device, and the alkalinity dosing device is controlled by the PLC to realize accurate dosing of the medicament, so that the automation and the intelligence are high, the manual consumption in operation is low, and the operation efficiency is high.
Drawings
FIG. 1 is a schematic structural view of a system for deep denitrification of kitchen waste water in accordance with an embodiment of the present invention;
in the drawings: 1. a regulating tank; 2. a primary A/O system; 3. an intermediate sedimentation tank; 4. total nitrogen on-line monitoring equipment; 5. an additional carbon source adding device; 6. a secondary A/O system; 7. MBR membrane system; 8. a middle water tank; 9. an alkalinity on-line monitoring instrument; 10. an alkalinity dosing device; 11. total nitrogen advanced treatment unit.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description is given for clear and complete description of the technical solution of the present invention with reference to the embodiments of the present invention, and other similar embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
Detailed description of the preferred embodiment 1
A kitchen waste wastewater deep denitrification treatment system, as shown in figure 1, the device comprises a regulating tank 1 for balancing the water quality and the water quantity of wastewater generated by centrifugal dehydration after anaerobic fermentation of kitchen waste and other production wastewater, a primary A/O system 2 for degrading COD, ammonia nitrogen and total nitrogen of the wastewater balanced by the regulating tank 1, an intermediate sedimentation tank 3 for separating mud from water and removing dissolved oxygen of primary degraded mixed liquor obtained by the primary A/O system 2, a secondary A/O system 6 for secondarily removing total nitrogen of clear liquor obtained by separation of the intermediate sedimentation tank 3, an MBR membrane system 7 for carrying out mud from water of the mixed liquor secondarily removed by the secondary A/O system 6, and a total nitrogen deep treatment device 11 for deeply removing total nitrogen of the clear liquor obtained by the MBR 7, which are connected in sequence. According to the utility model, waste water generated by centrifugal dehydration after anaerobic fermentation of kitchen waste and other production waste water are collected in the regulating tank 1 and lifted to the two-stage A/O system, pollutants such as COD (chemical oxygen demand), ammonia nitrogen and the like in the waste water are degraded through activated sludge, and the operating conditions of the A/O system of each stage are optimized through arranging the intermediate sedimentation tank 3. The microorganism in the intermediate sedimentation tank 3 breathes and consumes dissolved oxygen, and the clear liquid obtained by the MBR membrane system 7 is subjected to a deep denitrification process by utilizing the total nitrogen deep treatment device 11.
Further, a total nitrogen online monitoring device 4 for monitoring total nitrogen data in clear liquid at the water outlet of the intermediate sedimentation tank 3 in real time and an external carbon source adding device 5 for adding a carbon source to the tank A in the secondary A/O system 6 according to the total nitrogen data detected by the total nitrogen online monitoring device 4 are arranged at the water outlet of the intermediate sedimentation tank 3. The external PLC is used for receiving the total nitrogen data signals transmitted by the total nitrogen on-line monitoring equipment 4 and sending carbon source adding amount control signals to the external carbon source adding device 5 according to the total nitrogen data signals, so that the purpose of timely adjusting the carbon source adding amount of the secondary A/O system 6 according to the total nitrogen data is achieved, accurate adding and efficient utilization of the carbon source are achieved, and the total nitrogen removal rate of the A pool in the secondary A/O system 6 and the utilization rate of the carbon source are improved.
Specifically, in this embodiment, the intermediate settling tank 3 is a vertical settling tank. The intermediate sedimentation tank 3 is additionally arranged between the primary nitrification and the secondary nitrification and denitrification to realize the independent control of the working conditions of the primary denitrification system and the secondary denitrification system; and utilize the middle sedimentation tank 3 to eliminate oxygen, reduce the dissolved oxygen amount of A pond inflow in the second grade A/O system 6, in addition, through the total nitrogen on-line monitoring equipment 4 that sets up between the water outlet department of the middle sedimentation tank 3 and the second grade A pond intake end, and through the theoretical computer actual project experiment of the denitrification carbon-nitrogen ratio, control the adding device 5 of the additional carbon source through the PLC controller in order to realize the automatic adding of carbon source, improve adding accuracy and utilization ratio of supplementing the carbon source.
Furthermore, an alkalinity on-line monitoring instrument 9 is arranged at the water inlet end of the total nitrogen advanced treatment device 11, and the alkalinity required to be consumed by the total nitrogen advanced treatment device 11 is automatically controlled and supplemented through the alkalinity on-line monitoring instrument 9 and the alkalinity medicine adding device 10. Specifically, the alkalinity signal in the clear liquid at the water inlet end of the total nitrogen advanced treatment device 11 is received through an external PLC, and the dosage control signal is sent to the alkalinity dosing device 10 in real time according to the alkalinity signal, so that the alkalinity of the clear liquid at the water inlet end of the total nitrogen advanced treatment device 11 is controlled in real time.
Specifically, the MBR membrane system realizes the sludge-water separation of heterotrophic nitrification and denitrification and creates conditions for back-end deep denitrification. The MBR membrane system can adopt a commonly used external MBR membrane system and an internal MBR membrane system.
Further, the total nitrogen advanced treatment device 11 comprises an autotrophic denitrification filter, a water and gas distribution device, an air flushing system and a water backwashing system, wherein the water and gas distribution device, the air flushing system and the water backwashing system are used for being matched with the autotrophic denitrification filter, the autotrophic denitrification filter adopts an upflow denitrification filter, and a filter material in the autotrophic denitrification filter adopts an autotrophic nitrogen removal filter material, is a high-efficiency microorganism carrier and a high-efficiency electron donor, ensures the stable operation of autotrophic denitrification, and can play a certain physical filtering role at the same time. The water and gas distributing device is made of filter bricks, and the water and gas distributing device in the form of the filter bricks has the characteristics of effectively reducing the construction difficulty and being free of maintenance. Specifically, an alkalinity on-line monitoring instrument 9 and an alkalinity dosing device 10 are both arranged at the water inlet end of the autotrophic denitrification filter. The total nitrogen advanced treatment device 11 is used for removing total nitrogen substances in the water produced by the intermediate water tank 8. The produced water in the middle water tank 8 is lifted by a water pump to enter a water distribution system of a total nitrogen advanced treatment device 11, then flows upwards and carries out denitrification reaction by autotrophic denitrifying bacteria attached to the filler to convert nitrate into nitrogen to complete denitrification. When microorganisms on the filler fall to block the water flow ascending channel, a backwashing fan or a water pump can be adopted for washing.
Further, a filter used for ensuring the accuracy of online detection data is arranged between the intermediate sedimentation tank 3 and the total nitrogen online monitoring equipment 4, and the maintenance frequency of the total nitrogen online monitoring equipment 4 is reduced.
Further, a lifting water pump for lifting the wastewater balanced by the adjusting tank 1 into the primary A/O system 2 is arranged between the adjusting tank 1 and the primary A/O system 2.
Further, the advanced denitrification treatment system for kitchen waste and wastewater also comprises an intermediate water tank 8 positioned between the MBR membrane system and the total nitrogen advanced treatment device 11. And (4) performing sludge-water separation on the mixed liquor in the step S1 by using an MBR membrane device, and temporarily storing the obtained produced water in the intermediate water tank 8.
When the anaerobic fermentation type kitchen waste treatment device is used, waste water (biogas slurry) generated by centrifugal dehydration after anaerobic fermentation of kitchen waste and other production waste water are collected and guided to the adjusting tank 1, and water quality and water quantity are balanced in the adjusting tank 1. And then the wastewater which is balanced by the regulating tank 1 is lifted to a first-level A/O system 2 through a first lifting water pump to degrade COD, ammonia nitrogen and total nitrogen. And (3) connecting the mixed liquid subjected to the primary degradation of the primary A/O system 2 to the intermediate sedimentation tank 3, performing sludge-water separation and dissolved oxygen removal to obtain clear liquid, connecting the clear liquid to the secondary A/O system 6, detecting the total nitrogen through the total nitrogen online monitoring equipment 4, automatically controlling the carbon source supplement to the secondary A tank, and performing secondary removal on the total nitrogen. And (3) carrying out sludge-water separation on the mixed liquid after the total nitrogen removal by using an MBR (membrane bioreactor) system 7, collecting and caching the separated clear liquid, then feeding the clear liquid into a total nitrogen advanced treatment device 11 for the total nitrogen advanced removal, and automatically controlling and supplementing the alkalinity required to be consumed by the total nitrogen advanced treatment device 11 by using an alkalinity on-line monitoring instrument 9 and an alkalinity dosing device 10. The effluent treated by the total nitrogen advanced treatment device 11 can stably meet the emission limit requirement of the pollutant control standard of the household garbage landfill.
The utility model adopts a three-stage denitrification process with independently controlled working conditions at each stage, and realizes the standard discharge of total nitrogen through two-stage heterotrophic nitrification and denitrification and one-stage autotrophic denitrification. An intermediate sedimentation tank 3 is added between the first-stage A/O system 2 and the second-stage A/O system 6 to realize the purposes of O tank effluent oxygen elimination and independent control of the first-stage nitrification and denitrification activated sludge and the second-stage nitrification and denitrification activated sludge in the first-stage A/O system 2.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.
Claims (8)
1. The advanced denitrification treatment system for the kitchen waste wastewater is characterized by comprising a regulating tank, a primary A/O system, an intermediate sedimentation tank, a secondary A/O system, an MBR membrane system and a total nitrogen advanced treatment device, wherein the regulating tank is used for balancing the water quality and the water quantity of wastewater generated by centrifugal dehydration after anaerobic fermentation of the kitchen waste and other production wastewater, the primary A/O system is used for degrading COD, ammonia nitrogen and total nitrogen of the wastewater balanced by the regulating tank, the intermediate sedimentation tank is used for carrying out sludge-water separation and dissolved oxygen removal on primary degraded mixed liquid obtained by the primary A/O system, the secondary A/O system is used for carrying out secondary total nitrogen removal on clear liquid obtained by separation of the intermediate sedimentation tank, the membrane system is used for carrying out sludge-water separation on mixed liquid obtained by secondary total nitrogen removal of the secondary A/O system, and the total nitrogen advanced treatment device is used for carrying out deep total nitrogen removal on the clear liquid obtained by the MBR.
2. The advanced denitrification treatment system for kitchen waste and wastewater as claimed in claim 1, wherein a total nitrogen online monitoring device for monitoring total nitrogen data in clear liquid at the water outlet of the intermediate sedimentation tank in real time and an external carbon source adding device for adding a carbon source to the tank A in the secondary A/O system according to the total nitrogen data detected by the total nitrogen online monitoring device are arranged at the water outlet of the intermediate sedimentation tank.
3. The advanced denitrification treatment system for kitchen waste and wastewater according to claim 1, wherein an alkalinity on-line monitoring instrument is arranged at the water inlet end of the total nitrogen advanced treatment device, and the alkalinity required to be consumed by the total nitrogen advanced treatment device is automatically controlled and supplemented by the alkalinity on-line monitoring instrument and the alkalinity dosing device.
4. The advanced denitrification treatment system for kitchen waste wastewater as claimed in claim 1, further comprising an intermediate water tank between the MBR membrane system and the total nitrogen advanced treatment device.
5. The advanced kitchen waste and wastewater denitrification treatment system according to claim 1, wherein the advanced total nitrogen treatment device comprises an autotrophic denitrification filter, and a filter material of the autotrophic denitrification filter is an autotrophic nitrogen removal filter material.
6. The advanced kitchen waste and wastewater denitrification treatment system according to claim 5, wherein the advanced total nitrogen treatment device further comprises a water and gas distribution device matched with the autotrophic denitrification filter tank, and the water and gas distribution device is a filter brick.
7. The advanced denitrification treatment system for kitchen waste and wastewater as claimed in claim 1, wherein a filter for ensuring the accuracy of online detection data of the online total nitrogen monitoring device is arranged between the intermediate sedimentation tank and the online total nitrogen monitoring device.
8. The advanced denitrification treatment system for kitchen waste and wastewater as claimed in claim 1, wherein a lift pump for lifting wastewater balanced by the adjusting tank into the primary A/O system is arranged between the adjusting tank and the primary A/O system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120634906.4U CN216550012U (en) | 2021-03-29 | 2021-03-29 | Advanced denitrification treatment system for kitchen waste wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120634906.4U CN216550012U (en) | 2021-03-29 | 2021-03-29 | Advanced denitrification treatment system for kitchen waste wastewater |
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| CN216550012U true CN216550012U (en) | 2022-05-17 |
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| CN202120634906.4U Active CN216550012U (en) | 2021-03-29 | 2021-03-29 | Advanced denitrification treatment system for kitchen waste wastewater |
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- 2021-03-29 CN CN202120634906.4U patent/CN216550012U/en active Active
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