CN112142197B - Autotrophic denitrification filter sewage treatment system - Google Patents
Autotrophic denitrification filter sewage treatment system Download PDFInfo
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- CN112142197B CN112142197B CN202010981026.4A CN202010981026A CN112142197B CN 112142197 B CN112142197 B CN 112142197B CN 202010981026 A CN202010981026 A CN 202010981026A CN 112142197 B CN112142197 B CN 112142197B
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- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 55
- 239000010865 sewage Substances 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 132
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000000463 material Substances 0.000 claims abstract description 57
- 238000011001 backwashing Methods 0.000 claims abstract description 55
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004927 clay Substances 0.000 claims abstract description 9
- 239000010881 fly ash Substances 0.000 claims abstract description 9
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011028 pyrite Substances 0.000 claims abstract description 9
- 229910052683 pyrite Inorganic materials 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 15
- 239000002351 wastewater Substances 0.000 claims description 15
- 229910002651 NO3 Inorganic materials 0.000 claims description 14
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 14
- 241000894006 Bacteria Species 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 101100520231 Caenorhabditis elegans plc-3 gene Proteins 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012767 functional filler Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to the field of sewage treatment process, in particular to a method for treating sewageAn autotrophic denitrification filter sewage treatment system for sewage with low C/N ratio. The system comprises a filter chamber denitrification control unit, a filter material replacement alarm unit, a constant water level operation control unit, a nitrogen displacement control unit and a backwashing control unit; wherein the height of the autotrophic filter material zone of the denitrification control unit of the filter tank is 1.5 to 1.6m, and the autotrophic filter material zone is filled with the filter material with the bulk density of 0.85 to 0.90g/cm 3 The high-efficiency filter material is formed by baking pyrite, iron powder, fly ash and clay in an environment of 400-500 ℃ under an anaerobic condition, the particle size of the high-efficiency filter material is 5-8mm, the sphericity is 0.75-0.80, and the denitrification load of the filter material is 2.0kgNO 3 ‑N/(m 3 D). The autotrophic denitrification filter tank sewage treatment system is used for treating sewage with low C/N ratio, does not need any additional organic carbon source, and has the characteristics of long backwash cycle, long filter material running period, low running cost, small occupied area, low civil construction investment, high automation degree, simple running operation, stable water outlet and the like.
Description
Technical Field
The invention relates to the field of sewage treatment processes, in particular to an autotrophic denitrification filter sewage treatment system for treating sewage with a low C/N ratio.
Background
In order to improve the water environment quality of key watershed, tail water of sewage treatment plants in various places is subjected to the first-level A standard in the discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002) and is even improved to the IV and III water quality standards, and the total nitrogen of effluent is one of key factors influencing the effluent to reach the standard. The sewage treatment plants mostly adopt an activated sludge process for biological denitrification treatment, the total nitrogen of secondary effluent is 12-20 mg/L, and the fluctuation range of some sewage treatment plants is larger. Due to the problems of limited residence time, backflow, carbon source and the like of an anoxic tank of a biochemical system and poor pre-denitrification capability, a deep denitrification process needs to be established at the rear end for further denitrification. At present, the denitrification deep bed filter tank is adopted in the traditional deep denitrification process in China, the nitrate nitrogen in the effluent can reach below 5mg/L through an external carbon source, and the denitrification deep bed filter tank integrates the biological denitrification and filtering functions and can simultaneously remove the total nitrogen and suspended matters.
In a sewage treatment project with a low C/N ratio, after secondary biochemical treatment, a carbon source in effluent is seriously insufficient, but the total nitrogen does not meet the discharge requirement at the moment, a large amount of carbon sources need to be added into a denitrification filter to meet the requirement of denitrification by heterotrophic denitrifying bacteria, the denitrification filter commonly used at present is a rear-mounted filter, and the additional supplement of carbon sources such as sodium acetate and the like is needed to ensure the denitrification, so that the running cost of the whole sewage treatment plant is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an autotrophic denitrification filter sewage treatment system for treating sewage with low C/N ratio.
In order to solve the technical problem, the technical scheme is that the autotrophic denitrification filter tank sewage treatment system comprises a filter tank denitrification control unit, and is characterized in that the filter tank denitrification control unit comprises a water distribution channel, a filter tank for treating sewage and a clean water tank, the filter tank is divided into a clean water area, an autotrophic filter material area and a water and air distribution area from top to bottom, a water inlet is formed in the position, close to the top, of the clean water area of the filter tank, a water outlet is formed in the position, close to the bottom, of the water distribution area of the filter tank, a water inlet is formed in the position, close to the bottom, of the water distribution area of the filter tank, the water inlet is communicated with the water distribution channel through a channel, the water outlet is communicated with the clean water tank through a pipeline, the autotrophic filter material area is 1.5-1.6 m in height, a high-efficiency filter material formed by drying pyrite, iron powder, fly ash and clay is filled in the filter material, the high-efficiency filter material is 5-8mm in particle size, 0.75-0.80 in sphericity, and the denitrification load is 2.0 kNO 3 -N/(m 3 .d)。
As a further technical scheme of the autotrophic denitrification filter sewage treatment system:
preferably, the bulk density of the high-efficiency filter material in an autotrophic filter material area is 0.85 to 0.90g/cm 3 。
Preferably, the high-efficiency filter material is formed by baking pyrite, iron powder, fly ash and clay in an environment of 400-500 ℃ under an oxygen-free condition, wherein the mass ratio of the pyrite to the iron powder to the fly ash to the clay is (60-70): (15-20): 5-10): 20-30).
Preferably, this autotrophic denitrification filtering pond sewage treatment system is provided with the filter material and changes alarm unit, alarm unit is changed including setting up the first nitrate nitrogen analysis appearance in joining in marriage the ditch, the second nitrate nitrogen analysis appearance of setting in the clean water basin to and the fourth PLC controller of first nitrate nitrogen analysis appearance of signal connection and second nitrate nitrogen analysis appearance, when the difference in data of first nitrate nitrogen analysis appearance and second nitrate nitrogen analysis appearance measurement is less than the value 10mg/L that the fourth PLC controller set for, the fourth PLC controller sends alarm signal, reminds to change the filter material.
Preferably, a pneumatic gate is arranged on a channel for communicating the water inlet of the filter tank with the water distribution channel, and a third pneumatic gate is arranged on a pipeline for communicating the water outlet of the filter tank with the clean water tank.
Preferably, this autotrophic denitrification filter sewage treatment system is provided with constant water level operation control unit, constant water level operation control unit is including setting up ultrasonic wave level gauge, the third pneumatic valve in the clear water district in the filtering pond to and the first PLC controller of signal connection ultrasonic wave level gauge and third pneumatic valve, the ultrasonic wave level gauge is with the automatic transmission of the liquid level signal in the filtering pond of survey to first PLC controller, by the degree of opening of first PLC controller control third pneumatic valve.
Preferably, the autotrophic denitrification filter sewage treatment system is provided with a nitrogen driving control unit, the nitrogen driving control unit comprises a first pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a pneumatic gate, a backwashing water pump and a second PLC controller, the first pneumatic valve is arranged on a pipeline which is communicated with a clean water area and a wastewater tank of the filter and controls water flow to flow from the filter to the wastewater tank, the fourth pneumatic valve is arranged on a pipeline which is communicated between a water distribution and gas distribution area of the filter and the clean water area, the backwashing water pump provides power for water flow in the pipeline and controls water flow to the filter from the clean water tank, and the second PLC controller is in signal connection with the third pneumatic valve, the fourth pneumatic valve, the pneumatic gate and the backwashing water pump.
Preferably, the autotrophic denitrification filter sewage treatment system is provided with a backwashing control unit, the backwashing control unit comprises a backwashing machine, a backwashing water pump, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a pneumatic gate, an ultrasonic liquid level meter, a third PLC controller and a wastewater pool, the second pneumatic valve is arranged on a pipeline communicated between the backwashing machine and a water and gas distribution area of the filter pool and controls gas to flow from the backwashing machine to the filter pool, the third PLC controller is respectively in signal connection with the backwashing machine, the backwashing water pump, the first pneumatic valve, the second pneumatic valve, the third pneumatic valve, the fourth pneumatic valve, the pneumatic gate and the ultrasonic liquid level meter, and the ultrasonic liquid level meter transmits collected liquid level information to the third PLC controller.
Preferably, the gas washing strength of the back washing control unit is 60m 3 /(m 2 H) washing strength of 10m 3 /(m 2 .h)。
Compared with the prior art, the invention has the beneficial effects that:
1. after the sewage enters the autotrophic denitrification filter tank, autotrophic microorganisms in the filter tank utilize inorganic matters (such as S) in the filter material 2- 、Fe、Fe 2+ Etc.) as an electron donor for nitrate reduction, the nitrate is subjected to denitrification treatment. According to the technical scheme, the high-efficiency filter material is added into the denitrification filter tank to replace the traditional quartz sand filter material, autotrophic denitrifying bacteria are cultured, the autotrophic denitrification functional filler is used for providing an electron donor, the denitrification function is realized, and the filtering function is realized. The whole denitrification process does not need to add any organic carbon source, which is essentially different from the traditional denitrification process. Compared with the traditional denitrification filter tank, the autotrophic denitrification filter tank has the characteristics of long backwashing period, long filter material running period, low running cost, small occupied area, low civil engineering investment, high automation degree, simple running operation, stable water outlet and the like.
2. The filter material can meet the denitrification requirement of autotrophic denitrifying bacteria under the condition that the denitrification control unit of the filter tank does not add any organic carbon source, therebyThe cost for adding the carbon source is saved. The denitrification load of the high-efficiency filter material is 3 times of that of the traditional sea sand filter material, and the retention time of the autotrophic denitrification filter is 15min under the condition of removing the same total nitrogen; compared with the traditional denitrification filter, the occupied area is reduced by 20 percent, and the civil engineering investment is reduced by 16 percent; the constant water level operation mode of the constant water level operation control unit can ensure the normal growth environment and the concentration of denitrifying bacteria in the filter tank, and ensure the treatment effect; compared with the traditional denitrification filter, the backwashing control unit can save energy by about 30 percent through single backwashing, and the normal backwashing period is 2 months. The air washing strength of the traditional denitrification filter is 90m 3 /(m 2 H) washing strength of 15m 3 /(m 2 H) and the air washing strength of the autotrophic denitrification filter is 60m 3 /(m 2 H) washing strength of 10m 3 /(m 2 H); the nitrogen-driving control unit can periodically drive out nitrogen generated in the filter material layer during denitrification; the filter material replenishing alarm unit can automatically alarm to remind the user of replenishing filter materials in time.
Drawings
FIG. 1 is a schematic view of an autotrophic denitrification filter sewage treatment system according to the invention;
the designations in the drawings have the following meanings:
1. a first PLC controller; 2. a second PLC controller; 3. a third PLC controller; 4. a fourth PLC controller; 5. a water distribution channel; 6. a filter chamber; 61. a clear water zone; 62. an autotrophic filtering material area; 63. a water and gas distribution area; 7. a wastewater tank; 8. a clean water tank; 9. a first nitrate nitrogen analyzer; 10. a second nitrate nitrogen analyzer; 11. backwashing the water pump; 12. a back washing machine; 13. an ultrasonic liquid level meter;
a. a first pneumatic valve; b. a second pneumatic valve; c. a third pneumatic valve; d. a fourth pneumatic valve; e. a pneumatic gate;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
Example 1
As shown in figure 1, an autotrophic denitrification filter sewage treatment system, including filter chamber denitrogenation the control unit, its characterized in that, filter chamber denitrogenation the control unit includes distribution canal 5, the filtering chamber 6 and the clean water basin 8 of handling sewage, filtering chamber 6 from the top down is regional to divide into clean water district 61, autotrophic filter material district 62, water distribution gas distribution district 63, filtering chamber 6 is provided with the water inlet in the position that clean water district 61 is close to the top, 6 be provided with the delivery port in the position that water distribution gas distribution district 63 is close to the bottom, the water inlet pass through the channel with distribution canal 5 intercommunication, the delivery port passes through pipeline and clean water basin 8 intercommunication filtering chamber 6's water inlet with be provided with pneumatic gate e in the channel of distribution canal 5 intercommunication be provided with third pneumatic gate c on the delivery port of filtering chamber 6 and the pipeline of clean water basin 8 intercommunication. The height of the autotrophic filter material area 62 is about 1.5 to 1.6m, and the autotrophic filter material area is filled with filler with the packing density of 0.85 to 0.90g/cm 3 The high-efficiency filter material is prepared by baking pyrite, iron powder, fly ash and clay in an environment of 400-500 ℃ under an anaerobic condition, and comprises, by weight, 60-70 parts of pyrite, 15-20 parts of iron powder, 5-10 parts of fly ash and 20-30 parts of clay, wherein the particle size of the high-efficiency filter material is 5-8mm, the sphericity is 0.75-0.80, and the denitrification load of the filter material is 2.0kgNO 3 -N/(m 3 .d)。
This autotrophic denitrification filtering pond sewage treatment system sets up the filter material and changes alarm unit, alarm unit is changed to the filter material is including setting up the first nitrate state nitrogen analysis appearance 9 in joining in marriage ditch 5, the second nitrate state nitrogen analysis appearance 10 of setting in clear water basin 8 and the fourth PLC controller 4 of the first nitrate state nitrogen analysis appearance 9 of signal connection and second nitrate state nitrogen analysis appearance 10, when the data difference of first nitrate state nitrogen analysis appearance 9 and second nitrate state nitrogen analysis appearance 10 measurement is less than the value 10mg/L that fourth PLC controller 4 set for, fourth PLC controller 4 sends alarm signal, reminds to change the filter material.
This autotrophic denitrification filtering pond sewage treatment system is provided with constant water level operation the control unit, constant water level operation the control unit including setting up ultrasonic wave level gauge 13, the third pneumatic valve c of clear water district 61 in filtering pond 6 and signal connection ultrasonic wave level gauge 13 and the first PLC controller 1 of third pneumatic valve c, ultrasonic wave level gauge 13 is with the liquid level signal automatic transmission to first PLC controller 1 in the filtering pond 6 of survey, by the opening degree of first PLC controller 1 control third pneumatic valve c, maintains the interior liquid level constancy of filtering pond 6.
The autotrophic denitrification filter sewage treatment system is provided with a nitrogen driving control unit, the nitrogen driving control unit comprises a first pneumatic valve a, a third pneumatic valve c, a fourth pneumatic valve d, a pneumatic valve e, a backwash water pump 11 and a second PLC controller 2, the first pneumatic valve a is arranged on a pipeline communicating a clear water area 61 of the filter 6 with a wastewater tank 7 and controlling water flow to flow from the filter 6 to the wastewater tank 7, the fourth pneumatic valve d is arranged on a pipeline communicating a water distribution and gas distribution area 63 of the filter 6 with the clear water tank 8, the backwash water pump 11 provides power for water flow in the pipeline and controls water flow to flow from the clear water tank 8 to the filter 6, the second PLC controller 2 is in signal connection with the third pneumatic valve c, the fourth pneumatic valve d, the pneumatic valve e and the backwash water pump 11,
the autotrophic denitrification filter sewage treatment system is provided with a back-washing control unit, the back-washing control unit comprises a back-washing machine 12, a back-washing water pump 11, a first pneumatic valve a, a second pneumatic valve b, a third pneumatic valve c, a fourth pneumatic valve d, a pneumatic valve e, an ultrasonic liquid level meter 13, a third PLC (programmable logic controller) 3 and a wastewater tank 7, the second pneumatic valve b is arranged on a pipeline communicated between the back-washing machine 12 and a water and gas distribution area 63 of a filter 6 and controls gas to flow from the back-washing machine 12 to the filter 6, the third PLC 3 is respectively in signal connection with the back-washing machine 12, the back-washing water pump 11, the first pneumatic valve a, the second pneumatic valve b, the third pneumatic valve c, the fourth pneumatic valve d, the pneumatic valve e and the ultrasonic liquid level meter 13, the ultrasonic liquid level meter 13 transmits collected liquid level information to the third PLC 3, and the back-washing strength of the back-washing control unit is 60m 3 /(m 2 H) washing strength of 10m 3 /(m 2 .h)。
Example 2
The following description will be made on the working process of the autotrophic denitrification filter sewage treatment system of the present invention with reference to the structure of the system in embodiment 1:
sewage flows through the water distribution channel 5, when the filter 6 is in normal filtration operation, the water inlet pneumatic gate e and the water outlet third pneumatic valve c are opened, the first pneumatic valve a, the second pneumatic valve b and the fourth pneumatic valve d are closed, the sewage directly enters the filter 6 from the water distribution channel 5 through the water distribution channel, sequentially passes through the clear water layer 61, the autotrophic filter material layer 62 and the water and gas distribution layer 63 in the filter 6, is treated and then is discharged to the clear water tank 8 from the third pneumatic valve c, and the outlet water is discharged after reaching the standard;
the system is provided with a constant water level operation control unit, by setting up the ultrasonic wave level gauge 13 in clear water district 61 in filtering pond 6, third pneumatic valve c and first PLC controller 1 are constituteed, first PLC controller 1 and ultrasonic wave level gauge 13 and third pneumatic valve c signal connection, liquid level signal transmission to first PLC controller 1 in the filtering pond 6 that ultrasonic wave level gauge 13 will survey, the degree of opening of third pneumatic valve c is controlled by first PLC controller 1, maintain the interior liquid level of filtering pond 6 invariable.
When the filtering material working time of the autotrophic filtering material zone 62 in the filtering pool 6 is too long, which causes the reduction of the filtering capacity, the filtering material needs to be backwashed. The backwashing control unit arranged in the system consists of a backwashing machine 12, a backwashing water pump 11, a first pneumatic valve a, a second pneumatic valve b, a third pneumatic valve c, a fourth pneumatic valve d, a pneumatic valve e, an ultrasonic liquid level meter 13, a third PLC (programmable logic controller) 3 and a wastewater tank 7. The air washing strength of the traditional denitrification filter is 90m 3 /(m 2 H) washing strength of 15m 3 /(m 2 H), the air washing strength of the autotrophic denitrification filter is 60m 3 /(m 2 H) washing strength of 10m 3 /(m 2 H). The back washing control unit automatically controls the opening of related valves by the third PLC 3 according to the set operating level difference requirement, automatically operates the matched back washing machine 12 and the back washing water pump 11 to meet the back washing requirement, does not carry out normal filtering operation when the filter 6 carries out back washing, and directly discharges the waste water generated by back washing into the waste water tank 7 and finally into a factory sewage well. The backwashing control flow of the autotrophic denitrification filter is as follows: when the ultrasonic wave is in the filter 6When the liquid level value collected by the liquid level meter 13 is higher than the set range, the third pneumatic valve c and the pneumatic valve e are closed, the first pneumatic valve a and the second pneumatic valve b are opened, the backwashing machine 12 is simultaneously opened for 2 minutes of air washing, then the fourth pneumatic valve d is opened, the backwashing water pump 11 is opened for 8 minutes of air-water combined washing, the backwashing machine 12 and the second pneumatic valve b are sequentially closed, the backwashing water pump 11 is continuously opened for 2 minutes and then stops, the fourth pneumatic valve d and the first pneumatic valve a are sequentially closed, the third pneumatic valve c and the pneumatic valve e are opened, and water inflow is started.
The nitrogen driving control unit arranged in the system consists of a backwashing water pump 11, a first pneumatic valve a, a third pneumatic valve c, a fourth pneumatic valve d, a pneumatic valve e and a second PLC (programmable logic controller) 2, the nitrogen generated in an autotrophic filter material area 62 of the filter 6 during denitrification is periodically expelled by controlling the operation of the backwashing water pump 11 and the opening of the valves, when the filter 6 is used for driving nitrogen, normal filtering operation is not carried out, and the wastewater generated by driving nitrogen is directly discharged into a wastewater pool 7 and is finally discharged into a factory sewage well. The control flow of the nitrogen removal control unit is as follows: and the second PLC 2 sets that nitrogen is driven once every 4-6 h, the third pneumatic valve c and the pneumatic valve e are closed in sequence when nitrogen is driven, the first pneumatic valve a and the fourth pneumatic valve d are opened, and then the backwashing water pump is opened for 11-5 min. After the nitrogen is driven, the backwashing water pump 11, the first pneumatic valve a and the fourth pneumatic valve d are closed, the third pneumatic valve c and the pneumatic valve e are opened in sequence, and the filter 6 returns to normal operation.
The alarm unit is added to the filter material that this system set up by the first nitrate nitrogen analyzer 9 of intaking, the second nitrate nitrogen analyzer 10 of play water, fourth PLC controller 4 constitutes, the high-efficient filter material in filtering pond 6 contains can provide the sulphur and the iron of denitrification electron donor, along with the going on of biological autotrophic denitrification, sulphur and iron can constantly consume, when sulphur and iron content in the filter material reduce gradually, denitrification efficiency also can reduce thereupon, play water nitrate nitrogen concentration can have the trend that becomes high, when the first nitrate nitrogen analyzer 9 of intaking and the second nitrate nitrogen analyzer 10 data difference of play water are less than the value 10mg/L that fourth PLC controller 4 set for, fourth PLC controller 4 automatic alarm, remind in time to add the filter material.
It should be understood by those skilled in the art that the foregoing is only illustrative of several embodiments of the invention, and not of all embodiments. It should be noted that many variations and modifications are possible to those skilled in the art, and all variations and modifications that do not depart from the gist of the invention are intended to be within the scope of the invention as defined in the appended claims.
Claims (6)
1. The autotrophic denitrification filter tank sewage treatment system comprises a filter tank denitrification control unit and is characterized in that the filter tank denitrification control unit comprises a water distribution channel (5), a filter tank (6) for treating sewage and a clean water tank (8), the filter tank (6) is divided into a clean water area (61), an autotrophic filter material area (62) and a water and gas distribution area (63) from top to bottom, a water inlet is formed in the position, close to the top, of the clean water area (61) of the filter tank (6), a water outlet is formed in the position, close to the bottom, of the water and gas distribution area (63) of the filter tank (6), the water inlet is communicated with the water distribution channel (5) through a channel, the water outlet is communicated with the clean water tank (8) through a pipeline, the height of the autotrophic filter material area (62) is 1.5-1.6 m, a high-efficiency filter material made of pyrite, iron powder, fly ash and clay is filled inside, the high-efficiency filter material is 5-8mm, the spherical degree is 0.75-0.80, and the denitrification load is 2.0 kNO 3 -N/(m 3 .d)；
The high-efficiency filter material is formed by baking pyrite, iron powder, fly ash and clay in an environment with the temperature of 400-500 ℃ under an anaerobic condition, the mass ratio of the pyrite, the iron powder, the fly ash and the clay is (60-70): 15-20): 5-10): 20-30, and the stacking density of the high-efficiency filter material in an autotrophic filter material area (62) is 0.85-0.90g/cm 3 ；
This autotrophic denitrification filtering pond sewage treatment system is provided with filter material and changes alarm unit, alarm unit is changed to the filter material is including setting up first nitrate state nitrogen analysis appearance (9) in joining in marriage ditch (5), second nitrate state nitrogen analysis appearance (10) of setting in clean water basin (8) to and fourth PLC controller (4) of first nitrate state nitrogen analysis appearance (9) of signal connection and second nitrate state nitrogen analysis appearance (10), when the data difference of first nitrate state nitrogen analysis appearance (9) and second nitrate state nitrogen analysis appearance (10) measurement is less than the value 10mg/L that fourth PLC controller (4) set for, fourth PLC controller (4) send alarm signal, remind to change the filter material.
2. The autotrophic denitrification filter sewage treatment system according to claim 1, wherein a pneumatic gate (e) is provided on a channel where the water inlet of the filter (6) communicates with the distribution channel (5), and a third pneumatic gate (c) is provided on a pipe where the water outlet of the filter (6) communicates with the clean water tank (8).
3. The autotrophic denitrification filter sewage treatment system according to claim 2, wherein the autotrophic denitrification filter sewage treatment system is provided with a constant water level operation control unit, wherein the constant water level operation control unit comprises an ultrasonic level meter (13) disposed in a clean water zone (61) of the filter (6), a third pneumatic valve (c), and a first PLC controller (1) in signal connection with the ultrasonic level meter (13) and the third pneumatic valve (c), wherein the ultrasonic level meter (13) automatically transmits a measured liquid level signal of the filter (6) to the first PLC controller (1), and the first PLC controller (1) controls the opening degree of the third pneumatic valve (c).
4. The autotrophic denitrification filter sewage treatment system according to claim 3, wherein the autotrophic denitrification filter sewage treatment system is provided with a nitrogen driving control unit comprising a first pneumatic valve (a), a third pneumatic valve (c), a fourth pneumatic valve (d), a pneumatic gate (e), a backwash water pump (11), and a second PLC controller (2), wherein the first pneumatic valve (a) is disposed on a pipe communicating a clean water area (61) of the filter (6) and the wastewater tank (7) and controls water flow from the filter (6) to the wastewater tank (7), the fourth pneumatic valve (d) is disposed on a pipe communicating a distribution area (63) of the filter (6) and the clean water tank (8), the backwash water pump (11) provides power for water flow in the pipe and controls water flow from the clean water tank (8) to the filter (6), and the second PLC controller (2) is connected with the pneumatic valves (c), the fourth pneumatic valve (d), the backwash water pump (e) and the backwash water pump (11) and backwash water pump (11).
5. The autotrophic denitrification filter sewage treatment system according to claim 4, wherein the autotrophic denitrification filter sewage treatment system is provided with a backwashing control unit, the backwashing control unit comprises a backwashing machine (12), a backwashing water pump (11), a first pneumatic valve (a), a second pneumatic valve (b), a third pneumatic valve (c), a fourth pneumatic valve (d), a pneumatic gate (e), an ultrasonic level meter (13), a third PLC (3) and a wastewater tank (7), the second pneumatic valve (b) is arranged on a pipeline communicated between the backwashing machine (12) and a water and gas distribution area (63) of the filter tank (6) and controls gas to flow from the backwashing machine (12) to the filter tank (6), the third PLC (3) is respectively in signal connection with the backwashing machine (12), the backwashing water pump (11), the first pneumatic valve (a), the second pneumatic valve (b), the third pneumatic valve (c), the fourth pneumatic valve (d), the pneumatic gate (e) and the ultrasonic level meter (13), and transmits information collected by the ultrasonic level meter to the PLC (3) to control the third pneumatic gate (c).
6. The autotrophic denitrification filter sewage treatment system according to claim 5, wherein the backwash control unit has a gas-wash intensity of 60m 3 /(m 2 H) washing strength of 10m 3 /(m 2 .h)。
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