CN113526783A - Device and method for improving nitrite accumulation rate of short-cut denitrification biofilm system - Google Patents
Device and method for improving nitrite accumulation rate of short-cut denitrification biofilm system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 51
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 title claims abstract description 36
- 238000009825 accumulation Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 230000008569 process Effects 0.000 claims abstract description 36
- 239000010865 sewage Substances 0.000 claims abstract description 34
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 30
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003513 alkali Substances 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000010802 sludge Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 9
- 239000004814 polyurethane Substances 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 241000894006 Bacteria Species 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000029219 regulation of pH Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 9
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000001272 nitrous oxide Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 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 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000005112 continuous flow technique Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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Classifications
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F2101/105—Phosphorus compounds
-
- 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
Abstract
The invention belongs to the technical field of biological sewage treatment, and relates to a device and a method for improving the nitrite accumulation rate of a short-cut denitrification biomembrane system, wherein urban sewage is continuously fed into a continuous flow short-cut denitrification SBBR from an urban sewage raw water tank through a first water inlet pump, and nitrate water distribution is continuously fed into the continuous flow short-cut denitrification SBBR from a nitrate water distribution tank through a second water inlet pump; continuously feeding alkali liquor into the continuous flow short-cut denitrification SBBR from the nitrate water distribution tank through a third water inlet pump; after the sewage reaction of the continuous flow short-cut denitrification SBBR reactor is finished, the sewage enters a right overflow weir for draining, and the effluent is drained into an effluent water tank through an electric drain valve; the operation of the short-range denitrification biofilm system is optimized by adjusting the pH and the HRT, the short-range denitrification biofilm system with high nitrite accumulation rate is obtained economically and efficiently, and the method has the advantages of simple process flow, easiness in operation, low energy consumption, economy, practicability and the like.
Description
The technical field is as follows:
the invention belongs to the technical field of biological sewage treatment, and relates to a device and a method for improving the nitrite accumulation rate of a short-cut denitrification biofilm system.
Background art:
with the progress and development of science and technology, the economy and society of China are rapidly developed; meanwhile, the environmental pollution problem in China is increasingly serious, and the pollution of the water environment becomes an urgent problem to be solved. The water pollution mainly takes the pollution of nitrogen, phosphorus and other nutrient elements as main parts, and the nitrogen pollution form of the water body in China is not optimistic. In five fresh water lakes, Taihu lake, Chaohu lake and Hongze lake are already in eutrophication state, Yangtang lake and Dongting lake have high nitrogen and phosphorus content and are in the transition stage to eutrophication. The nitrogen and phosphorus removal of the sewage becomes a research hotspot of experts and scholars at home and abroad. At present, two major methods, namely a physical chemical method and a biological method, are adopted for water nitrogen pollution, and the physical chemical method mainly comprises an air stripping method, an ion exchange method and the like. The physical and chemical denitrification has the advantages of high efficiency, high speed and the like, but the cost is higher. The biological denitrification technology is an economic and effective treatment technology which is provided on the basis of chemical and biological treatment methods, and is the most widely applied sewage treatment technology at present. However, the conventional biological denitrification process often has the problems of high energy consumption, complex process, low denitrification and dephosphorization efficiency, high operating cost and the like. Denitrification refers to a biochemical process in which denitrifying bacteria reduce nitrate nitrogen into nitrogen through a series of intermediate products, wherein the intermediate products comprise nitrite nitrogen, nitrous oxide and the like. Nitrite nitrogen is biologically toxic, nitrous oxide is a greenhouse gas and can damage the ozone layer, and accumulation of nitrous oxide in the biological treatment process of sewage is avoided as much as possible.
The whole denitrification process usually faces the problems of insufficient carbon source, high sludge yield and the like; while short-cut denitrification will leave the reaction product in the nitrite stage. Compared with the whole-course nitrification, the method has the advantages of low energy consumption, low sludge yield, short reaction time, no greenhouse gas generation and the like. Short-cut denitrification enables nitrite accumulation during denitrification. Nitrite is required to be used as a substrate required by the reaction in the anaerobic ammonia oxidation denitrification process, so that the nitrite is highly accumulated in the short-cut denitrification process. In the short-cut denitrification coupling anaerobic ammonia oxidation process, nitrate generated in the anaerobic ammonia oxidation process can be reduced in situ in the short-cut denitrification process, so that required nitrite is provided for anaerobic ammonia oxidation, a virtuous cycle is formed, and the total nitrogen removal efficiency is improved. The short-cut denitrification requires low C/N and aeration quantity, and can economically and effectively realize biological denitrification when treating nitrate-containing wastewater, nitrified effluent and anaerobic ammonium oxidation effluent. The stable and efficient accumulation of nitrite is the key of the short-cut denitrification technology, so that a device and a method for improving the nitrite accumulation rate of a short-cut denitrification biological membrane system are urgently needed to be designed.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and provides a device and a method for improving the nitrite accumulation rate of a short-cut denitrification biofilm system.
In order to achieve the purpose, the device for improving the nitrite accumulation rate of the short-range denitrification biofilm system comprises a municipal sewage raw water tank, a nitrate water distribution tank, an alkali liquor bottle, a continuous flow short-range denitrification SBBR reactor, an effluent water tank and an online monitoring and feedback control system, wherein the municipal sewage raw water tank is connected with the nitrate water distribution tank; a raw water tank of the urban sewage raw water tank is connected with the continuous flow short-cut denitrification SBBR through a first water inlet pump; the nitrate water distribution tank is connected with the continuous flow short-cut denitrification SBBR through a second water inlet pump; the alkali liquor bottle is connected with the continuous flow short-cut denitrification SBBR through a third water inlet pump; the continuous flow short-cut denitrification SBBR is connected with a water outlet tank through an electric drain valve; one end of a stirring paddle extends into the continuous flow short-range denitrification SBBR reactor, the other end of the stirring paddle is connected with a stirrer, a pH sensor and a DO sensor are arranged in the continuous flow short-range denitrification SBBR reactor, a first sampling port is arranged on the water inlet side of the continuous flow short-range denitrification SBBR reactor, a second sampling port is arranged on the water outlet side of the continuous flow short-range denitrification SBBR reactor, a mud valve on-line monitoring and feedback control system is arranged at the bottom of the continuous flow short-range denitrification SBBR reactor and comprises a computer and a programmable process controller, and a signal converter DA conversion interface, a signal converter AD conversion interface, a first water inlet relay, a second water inlet relay, a third water inlet relay stirrer relay, a pH/DO data signal interface, a water outlet relay and a mud discharge relay are arranged in the programmable process controller; the signal AD conversion interface on the programmable process controller is connected with a computer through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer; the computer is connected with the programmable process controller through a DA conversion interface of the signal converter, and a digital instruction of the computer is transmitted to the programmable process controller; the first water inlet relay is connected with the first water inlet pump; the second water inlet relay is connected with the second water inlet pump; the third water inlet relay is connected with a third water inlet pump; the stirrer relay is connected with the stirrer; the pH/DO data signal interface is connected with a pH/DO tester through a sensor lead; the pH sensor and the DO sensor are respectively connected with a pH/DO tester; the water outlet relay is connected with the electric drain valve; the mud discharging relay is connected with the mud discharging valve.
The sewage treatment process in the device comprises the following steps: continuously feeding the urban sewage into the continuous flow short-cut denitrification SBBR from the urban sewage raw water tank through a first water inlet pump, and continuously feeding the nitrate water distribution into the continuous flow short-cut denitrification SBBR from the nitrate water distribution tank through a second water inlet pump; continuously feeding alkali liquor into the continuous flow short-cut denitrification SBBR from the nitrate water distribution tank through a third water inlet pump; in a continuous flow short-cut denitrification SBBR reactor, denitrifying bacteria reduce nitrate into nitrite by using a carbon source in raw water as an electron donor; the third water inlet relay controls the alkali liquor inlet flow to adjust the pH value, the HRT is adjusted by controlling the total inlet flow to improve the nitrite accumulation rate of the biological membrane, the short-range denitrification capability of the biological membrane is optimized, and the purpose of improving the nitrite accumulation rate of a short-range denitrification biological membrane system is achieved; in the process, the continuous flow short-cut denitrification SBBR reactor is always kept in an anoxic stirring state; and after the sewage reaction of the continuous flow short-cut denitrification SBBR enters a right overflow weir for draining, and the effluent is discharged into an effluent water tank through an electric drain valve.
The specific process for improving the nitrite accumulation rate of the short-range denitrification biological membrane system comprises the following steps:
(1) starting the system:
adding the short-range denitrification biomembrane with good nitrite accumulation performance into a continuous flow short-range denitrification SBBR reactor, so that the sludge concentration in the inoculated continuous flow short-range denitrification biomembrane is 3000-5000 mg/L, and the volume of the modified polyurethane filler in the reactor accounts for 1/4-3/4 of the effective volume of the continuous flow short-range denitrification SBBR reactor;
(2) and (3) adjusting operation during operation:
adding the municipal domestic sewage into a municipal sewage raw water tank, adding nitrate water into a nitrate water distribution tank, and adding alkali liquor into an alkali liquor bottle; starting a first water inlet pump to continuously pump the urban domestic sewage into the continuous flow short-cut denitrification SBBR; starting a second water inlet pump to continuously pump the nitrate water distribution into the continuous flow short-range denitrification SBBR; starting a third water inlet pump to continuously pump the alkali liquor into the continuous flow short-range denitrification SBBR, stirring for 30-120 min in an anoxic manner, and continuously discharging effluent into an effluent water tank;
when the continuous flow short-cut denitrification SBBR runs, controlling the flow of alkaline liquor through a third water inlet relay to regulate and control the pH value to be 6-9 respectively, and stopping pH regulation and control when the accumulation rate of nitrite reaches 80%; controlling the total water inlet flow rate of the continuous flow short-cut denitrification SBBR reactor to regulate HRT (Rockwell temperature) for 1-8 h by using a first water inlet pump and a second water inlet pump, and stopping regulating the HRT when the nitrite accumulation rate reaches 80%;
when the continuous flow short-cut denitrification SBBR reactor runs, denitrifying bacteria are attached to and grow on the modified polyurethane filler, and the dissolved oxygen concentration in the continuous flow short-cut denitrification SBBR reactor is controlled to be less than 0.5 mg/L;
and when the continuous flow short-cut denitrification SBBR is operated, sludge is not discharged, and a small amount of floc sludge is discharged into a water outlet tank along with water flow in the operation process, so that the concentration of the sludge in the modified polyurethane filler is maintained within the range of 3000-5000 mg/L.
Compared with the prior art, the invention combines the denitrification and dephosphorization technologies of short-range denitrification, continuous flow reaction and the like, can realize the improvement of the nitrite accumulation rate on the basis of the continuous flow short-range denitrification operation, optimizes the operation of the short-range denitrification biomembrane system by adjusting the pH and the HRT, economically and efficiently obtains the short-range denitrification biomembrane system with high nitrite accumulation rate, has the advantages of simple process flow, easy operation, low energy consumption, economy, practicability and the like, and particularly has the following advantages: (1) aiming at the characteristic of low accumulation rate of nitrite in short-range denitrification, the short-range denitrification biofilm system is optimized by adjusting pH and HRT, so that the accumulation rate of nitrite is obviously improved, the pH and HRT are both convenient to adjust, the alkali liquor synthesis is simple, the high accumulation rate of nitrite can be economically and conveniently obtained, and the whole operation process is economical and simple; (2) the urban sewage has the characteristic of low C/N water quality, and the C/N required in the process of converting the short-range denitrification into the nitrite is smaller, so that an external carbon source is not required, and the operating cost is saved; aeration is not needed, and energy consumption is reduced; (3) the continuous flow biofilm reactor is adopted, the modified polyurethane filler is added into the SBR, the denitrifying bacteria mainly carry out attached growth, the advantages of small occupied area, strong treatment capacity, convenient operation, simple management and the like are achieved, the technical problems of sludge loss and low sludge growth speed in the conventional continuous flow process are solved, and the sludge loss of the continuous flow reactor is avoided.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a device for rapidly obtaining a biofilm with short-cut denitrification capability according to the invention, wherein 1 is a raw water tank of municipal sewage; 2 is a nitrate water distribution tank; 3 is an alkali liquor bottle; 4 is a continuous flow short-cut denitrification SBBR reactor; 5 is a water outlet tank; 6 is an on-line monitoring and feedback control system; 1.1 is a first overflow pipe; 1.2 a first blow-down pipe; 2.1 is a second overflow pipe; 2.2 is a second emptying pipe; 4.1 is a first water inlet pump; 4.2 is a second water inlet pump; 4.3 is a third water inlet pump; 4.4 is a stirrer; 4.5 is a stirring paddle; 4.6 is an electric drain valve; 4.7 is a first sampling port; 4.8 is a second sampling port; 4.9 is a mud valve; 4.10 is a pH/DO meter; 4.11 is a pH sensor; 4.12 is a DO sensor; 5.1 is a third overflow pipe; 5.2 a third emptying pipe; 6.1 is a computer; 6.2 is a programmable process controller; 6.3 is a DA conversion interface of the signal converter; 6.4 is a signal converter AD conversion interface; 6.5 is a first water inlet relay; 6.6 is a second water inlet relay; 6.7 is a third water inlet relay; 6.8 is a stirrer relay; 6.9 is a pH/DO data signal interface; 6.10 is a water outlet relay; 6.11 is a mud discharging relay.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings and examples.
Example (b):
the main structure of the device for increasing the nitrite accumulation rate of the short-cut denitrification biofilm system is shown in fig. 1, and comprises an urban sewage raw water tank 1, a nitrate water distribution tank 2, an alkali liquor bottle 3, a continuous flow short-cut denitrification SBBR reactor 4, an effluent water tank 5 and an online monitoring and feedback control system 6; the raw water tank 1 of the urban sewage raw water tank is connected with the continuous flow short-cut denitrification SBBR reactor 4 through a first water inlet pump 4.1; the nitrate water distribution tank 2 is connected with the continuous flow short-cut denitrification SBBR reactor 4 through a second water inlet pump 4.2; the alkali liquor bottle 3 is connected with the continuous flow short-cut denitrification SBBR reactor 4 through a third water inlet pump 4.3; the continuous flow short-cut denitrification SBBR reactor 4 is connected with a water outlet tank 5 through an electric drain valve 4.6; one end of a stirring paddle 4.5 extends into the continuous flow short-cut denitrification SBBR reactor 4, the other end of the stirring paddle is connected with a stirrer 4.4, a pH sensor 4.11 and a DO sensor 4.12 are arranged in the continuous flow short-cut denitrification SBBR reactor 4, a first sampling port 4.7 is arranged on the water inlet side of the continuous flow short-cut denitrification SBBR reactor 4, a second sampling port 4.8 is arranged on the water outlet side, and a mud valve 4.9 is arranged at the bottom of the continuous flow short-cut denitrification SBBR reactor 4; the on-line monitoring and feedback control system 6 comprises a computer 6.1 and a programmable process controller 6.2, wherein a signal converter DA conversion interface 6.3, a signal converter AD conversion interface 6.4, a first water inlet relay 6.5, a second water inlet relay 6.6, a third water inlet relay 6.7, a stirrer relay 6.8, a pH/DO data signal interface 6.9, a water outlet relay 6.10 and a mud discharging relay 6.11 are arranged in the programmable process controller 6.2; a signal AD conversion interface 6.4 on the programmable process controller 6.2 is connected with the computer 6.1 through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer 6.1; the computer 6.1 is connected with the programmable process controller 6.2 through a signal converter DA conversion interface 6.3, and a digital instruction of the computer 6.1 is transmitted to the programmable process controller 6.2; the first water inlet relay 6.5 is connected with the first water inlet pump 4.1; the second water inlet relay 6.6 is connected with the second water inlet pump 4.2; the third water inlet relay 6.7 is connected with the third water inlet pump 4.3; the stirrer relay 6.8 is connected with the stirrer 4.4; the pH/DO data signal interface 6.9 is connected with a pH/DO tester 4.10 through a sensor lead; the pH sensor 4.11 and the DO sensor 4.12 are respectively connected with a pH/DO tester 4.10; the water outlet relay 6.10 is connected with the electric drain valve 4.6; the sludge discharge relay 6.11 is connected with the sludge discharge valve 4.9.
This embodiment adopts the device to carry out the sample, and in the experimentation, experimental municipal sewage is taken from certain sewage treatment plant domestic sewage, and specific quality of water is as follows: COD concentration is 100-350 mg/L, NH4 +The concentration of-N is 35-54 mg/L, NO2 --N concentration < 0.5mg/L, NO3 -The N concentration is less than 0.5mg/L, the P concentration is 2-9 mg/L, and the pH is 6.8-8.2. Test System As shown in FIG. 1, the nitrate-containing water is water containing only sodium nitrate, NO3 -The concentration of N is 40-110 mg/L; the continuous flow short-cut denitrification SBBR reactor 4 is made of organic glass, the effective volume is 5L, and the specific operation is as follows:
(1) starting the system:
adding the short-range denitrification biomembrane with good nitrite accumulation performance into the continuous flow short-range denitrification SBBR reactor 4, so that the sludge concentration in the inoculated continuous flow short-range denitrification biomembrane is 4000mg/L, and the volume of the modified polyurethane filler in the reactor accounts for 1/3 of the effective volume of the continuous flow short-range denitrification SBBR reactor 4;
(2) and (3) adjusting operation during operation:
adding municipal domestic sewage into a municipal sewage raw water tank 1, adding nitrate water into a nitrate water distribution tank 2, and adding alkali liquor into an alkali liquor bottle 3; starting a first water inlet pump 4.1 to continuously pump the urban domestic sewage into the continuous flow short-cut denitrification SBBR reactor 4; starting a second water inlet pump 4.2 to continuously pump the nitrate water distribution into the continuous flow short-cut denitrification SBBR reactor 4; starting a third water inlet pump 4.3 to continuously pump the alkali liquor into the continuous flow short-cut denitrification SBBR reactor 4, stirring for 60min under oxygen deficiency, and continuously discharging effluent into an effluent water tank 5;
when the continuous flow short-cut denitrification SBBR (fluidized bed biological reactor) 4 operates, the pH values are respectively regulated to be 8 by controlling the flow of alkaline liquor through a third water inlet relay 6.7, and when the accumulation rate of nitrite reaches 80%, the pH regulation is stopped; controlling the total water inlet flow rate of a continuous flow short-cut denitrification SBBR reactor 4 to regulate HRT of the reactor 4 to be 1h through a first water inlet pump 4.1 and a second water inlet pump 4.2, and stopping regulating the HRT when the nitrite accumulation rate reaches 80%;
when the continuous flow short-cut denitrification SBBR 4 operates, sludge is not discharged, and a small amount of floc sludge is discharged into a water outlet tank along with water flow in the operation process, so that the sludge concentration in the modified polyurethane filler is 4000 mg/L.
The test result shows that: after the operation is stable, the COD concentration of the effluent of the continuous flow short-cut denitrification SBBR reactor 4 is 22-34 mg/L, and NO is2 -The concentration of-N is 30-100 mg/L, NO3 -The concentration of-N is less than 2mg/L, NTR is 80-90%, and the concentration of TP is less than 1 mg/L.
Claims (2)
1. A device for improving the nitrite accumulation rate of a short-cut denitrification biofilm system is characterized in that the device mainly comprises an urban sewage raw water tank, a nitrate water distribution tank, an alkali liquor bottle, a continuous flow short-cut denitrification SBBR reactor, a water outlet tank and an online monitoring and feedback control system; a raw water tank of the urban sewage raw water tank is connected with the continuous flow short-cut denitrification SBBR through a first water inlet pump; the nitrate water distribution tank is connected with the continuous flow short-cut denitrification SBBR through a second water inlet pump; the alkali liquor bottle is connected with the continuous flow short-cut denitrification SBBR through a third water inlet pump; the continuous flow short-cut denitrification SBBR is connected with a water outlet tank through an electric drain valve; one end of a stirring paddle extends into the continuous flow short-range denitrification SBBR reactor, the other end of the stirring paddle is connected with a stirrer, a pH sensor and a DO sensor are arranged in the continuous flow short-range denitrification SBBR reactor, a first sampling port is arranged on the water inlet side of the continuous flow short-range denitrification SBBR reactor, a second sampling port is arranged on the water outlet side of the continuous flow short-range denitrification SBBR reactor, a mud valve on-line monitoring and feedback control system is arranged at the bottom of the continuous flow short-range denitrification SBBR reactor and comprises a computer and a programmable process controller, and a signal converter DA conversion interface, a signal converter AD conversion interface, a first water inlet relay, a second water inlet relay, a third water inlet relay stirrer relay, a pH/DO data signal interface, a water outlet relay and a mud discharge relay are arranged in the programmable process controller; the signal AD conversion interface on the programmable process controller is connected with a computer through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer; the computer is connected with the programmable process controller through a DA conversion interface of the signal converter, and a digital instruction of the computer is transmitted to the programmable process controller; the first water inlet relay is connected with the first water inlet pump; the second water inlet relay is connected with the second water inlet pump; the third water inlet relay is connected with a third water inlet pump; the stirrer relay is connected with the stirrer; the pH/DO data signal interface is connected with a pH/DO tester through a sensor lead; the pH sensor and the DO sensor are respectively connected with a pH/DO tester; the water outlet relay is connected with the electric drain valve; the mud discharging relay is connected with the mud discharging valve.
2. A method for improving the nitrite accumulation rate of a short-range denitrification biological membrane system by adopting the device as claimed in claim 1, which is characterized by comprising the following specific processes:
(1) starting the system:
adding the short-range denitrification biomembrane with good nitrite accumulation performance into a continuous flow short-range denitrification SBBR reactor, so that the sludge concentration in the inoculated continuous flow short-range denitrification biomembrane is 3000-5000 mg/L, and the volume of the modified polyurethane filler in the reactor accounts for 1/4-3/4 of the effective volume of the continuous flow short-range denitrification SBBR reactor;
(2) and (3) adjusting operation during operation:
adding the municipal domestic sewage into a municipal sewage raw water tank, adding nitrate water into a nitrate water distribution tank, and adding alkali liquor into an alkali liquor bottle; starting a first water inlet pump to continuously pump the urban domestic sewage into the continuous flow short-cut denitrification SBBR; starting a second water inlet pump to continuously pump the nitrate water distribution into the continuous flow short-range denitrification SBBR; starting a third water inlet pump to continuously pump the alkali liquor into the continuous flow short-range denitrification SBBR, stirring for 30-120 min in an anoxic manner, and continuously discharging effluent into an effluent water tank;
when the continuous flow short-cut denitrification SBBR runs, controlling the flow of alkaline liquor through a third water inlet relay to regulate and control the pH value to be 6-9 respectively, and stopping pH regulation and control when the accumulation rate of nitrite reaches 80%; controlling the total water inlet flow rate of the continuous flow short-cut denitrification SBBR reactor to regulate HRT (Rockwell temperature) for 1-8 h by using a first water inlet pump and a second water inlet pump, and stopping regulating the HRT when the nitrite accumulation rate reaches 80%;
when the continuous flow short-cut denitrification SBBR reactor runs, denitrifying bacteria are attached to and grow on the modified polyurethane filler, and the dissolved oxygen concentration in the continuous flow short-cut denitrification SBBR reactor is controlled to be less than 0.5 mg/L;
and when the continuous flow short-cut denitrification SBBR is operated, sludge is not discharged, and a small amount of floc sludge is discharged into a water outlet tank along with water flow in the operation process, so that the concentration of the sludge in the modified polyurethane filler is maintained within the range of 3000-5000 mg/L.
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