CN114506923A - Biological denitrification device and method for coupling synchronous PD activated sludge with Anammox biological membrane - Google Patents
Biological denitrification device and method for coupling synchronous PD activated sludge with Anammox biological membrane Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 21
- 239000012528 membrane Substances 0.000 title claims abstract description 20
- 230000008878 coupling Effects 0.000 title claims abstract description 13
- 238000010168 coupling process Methods 0.000 title claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000945 filler Substances 0.000 claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000003647 oxidation Effects 0.000 claims abstract description 17
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 15
- 238000004062 sedimentation Methods 0.000 claims abstract description 13
- 239000010865 sewage Substances 0.000 claims description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910002651 NO3 Inorganic materials 0.000 claims description 16
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract description 3
- 238000005273 aeration Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 14
- 241000894006 Bacteria Species 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- 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 4
- 238000011081 inoculation Methods 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 235000017281 sodium acetate Nutrition 0.000 description 2
- 239000001632 sodium acetate Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002352 surface water Substances 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
- C02F3/286—Anaerobic digestion processes including two or more steps
-
- 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
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- 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
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/166—Nitrites
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- 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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C02F2209/15—N03-N
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention discloses a biological denitrification device and method for coupling synchronous PD activated sludge with an Anammox biological membrane, which comprises a reaction tank and a sedimentation tank, wherein short-cut denitrification activated sludge and a filler are arranged in the reaction tank, the filler is distributed in the short-cut denitrification activated sludge, and an anaerobic ammonia oxidation biological membrane cultured in advance is hung on the surface of the filler; the reaction tank is provided with a first water inlet, an overflow port and a sludge return port, and the overflow port is provided with a screen; the sedimentation tank is provided with a second water inlet, a water outlet and a sludge outlet, the second water inlet is connected with the overflow port, the sludge outlet is connected with a sludge discharge pipeline and a sludge return pipeline, and the sludge return pipeline is connected with the sludge return port. The device can be realized by adding the suspended filler hung with the anaerobic ammonium oxidation biological membrane into the existing anoxic tank, and the modification cost is low; the aeration cost and the energy consumption of an external carbon source are saved, and the operation energy consumption is relatively low; the sludge yield is reduced, and the biological denitrification effect is stable and efficient.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a biological denitrification device and method for coupling synchronous PD activated sludge with an Anammox biological membrane.
Background
Biological denitrification of wastewater is the most economic, widely applied and effective measure for preventing and treating eutrophication of water body at present. The biological denitrification technology adopted by sewage treatment plants is generally a traditional nitrification-denitrification process, and the effluent total nitrogen exceeds the standard due to large excess sludge yield, high operation energy consumption and low total nitrogen removal rate caused by insufficient carbon sources. Therefore, how to economically and efficiently improve the total nitrogen removal rate is an urgent problem to be solved in the sewage treatment industry.
The anaerobic ammonia oxidation (Anammox) process is a novel biological denitrification process with the most potential so far because of the advantages of no need of a carbon source, energy consumption saving, small sludge yield and the like. At present, the application of Anammox in a main stream biological denitrification process is limited by the extremely low growth rate (multiplication time 11-19 d) and the difficulty in realizing stable nitrite nitrogen supply, however, the sludge age (SRT) of Anammox can be theoretically infinitely prolonged by enabling the Anammox to fixedly grow on an inert carrier to ensure effective Anammox biomass, and meanwhile, the influence of low temperature and low ammonia nitrogen concentration under the main stream condition on short-range denitrification is far less than that of short-range nitrification. Therefore, a new way can be provided for the treatment of the domestic sewage and the nitrate-containing wastewater by combining the short-cut denitrification with the Anammox biofilm technology.
However, it is generally considered that the growth rate of the denitrifying bacteria is significantly higher than that of the Anammox bacteria when the concentration of the organic matters is too high, so that the dominant denitrification status of the Anammox bacteria is gradually replaced by the denitrifying bacteria, and the biological denitrification efficiency of the system is affected.
Therefore, how to organically and efficiently couple the short-cut denitrification and the anaerobic ammonia oxidation biomembrane technology in the same sewage treatment unit to carry out synchronous short-cut denitrification/anaerobic ammonia oxidation biological denitrification is a difficult problem to be solved by the prior process technology.
Disclosure of Invention
Aiming at the technical requirements, the invention provides a biological denitrification device and method for coupling a synchronous PD activated sludge with an Anammox biological membrane, which couple the short-cut denitrification and anaerobic ammonia oxidation biological membrane technologies in the same sewage treatment unit and solve the problems of increasing the occupied area of a sewage treatment plant and high cost in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a biological denitrification device for coupling synchronous PD activated sludge with an Anammox biological membrane comprises a reaction tank and a sedimentation tank; short-cut denitrification activated sludge and fillers are arranged in the reaction tank, the fillers are distributed in the short-cut denitrification activated sludge, and an anaerobic ammonia oxidation biological membrane cultured in advance is hung on the surface of the fillers; the reaction tank is provided with a first water inlet, an overflow port and a sludge return port, and the overflow port is provided with a screen; the sedimentation tank is provided with a second water inlet, a water outlet and a sludge outlet, the second water inlet is connected with the overflow port, the sludge outlet is connected with a sludge discharge pipeline and a sludge return pipeline, and the sludge return pipeline is connected with the sludge return port.
Preferably, the filler is a K3 filler or a K5 filler; the diameter of the filler is 2.5cm, and the specific surface area of the filler is 500-800 m2/m3。
Preferably, the accumulation rate of nitrite nitrogen in the short-cut denitrification activated sludge is 60-70% after the short-cut denitrification activated sludge is cultured in advance.
Preferably, the filling rate of the filler in the short-cut denitrification activated sludge is 15-20%.
Preferably, a stirring device is arranged in the reaction tank.
Furthermore, the denitrification device also comprises a sewage tank, and the sewage tank is connected with the first water inlet through a water inlet pump.
The invention also discloses a biological denitrification method for coupling the synchronous PD activated sludge with the Anammox biological membrane, which adopts the biological denitrification device for coupling the synchronous PD activated sludge with the Anammox biological membrane for treatment and specifically comprises the following steps:
injecting the nitrate-containing sewage to be treated into a reaction tank, maintaining the hydraulic retention time in the reaction tank to be 10-12 h, and completely mixing the filler in the short-cut denitrification activated sludge;
mixed liquid in the reaction tank enters a sedimentation tank through an overflow port for mud-water separation, separated supernatant is discharged out of the system through a water outlet, one part of the settled sludge is discharged out of the system as residual sludge, and the other part of the settled sludge returns to the reaction tank through a sludge return pipeline; the sludge age in the reaction tank is 15-20 d by controlling the proportion of the return sludge and the excess sludge, and the sludge concentration of the short-cut denitrification activated sludge in the reaction tank is 2000-2500 mg/L.
The operation temperature of the system in the reaction tank is normal temperature, and is generally 20-25 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method utilizes the advantage of fixed growth of anaerobic ammonia oxidation and the characteristic that the affinity of anaerobic ammonia oxidation to nitrite nitrogen under low-concentration organic matters is stronger than that of denitrifying bacteria, so that the denitrification process is promoted to stay at the stage of reducing nitrate into nitrite, and the generated nitrite nitrogen can be utilized by anaerobic ammonia oxidation in time; meanwhile, the stable short-cut denitrification of the system is effectively maintained by controlling the sludge age SRT and the hydraulic retention time HRT of the system, so that synchronous short-cut denitrification/anaerobic ammonia oxidation under the mainstream condition is realized.
(2) The device can be realized by adding the suspended filler hung with the anaerobic ammonium oxidation biological membrane into the existing anoxic tank, and the modification cost is low.
(3) Compared with the traditional nitrification-denitrification process, the method greatly saves the aeration cost and the energy consumption of an external carbon source, and has relatively low operation energy consumption.
(4) The method adopts an activated sludge-biofilm composite process, and compared with the traditional activated sludge process, the sludge yield is reduced; and the biological denitrification effect is stable and efficient.
Drawings
FIG. 1 is a schematic view of a biological denitrification apparatus using a synchronous PD activated sludge coupled with an Anammox biofilm according to example 1 of the present invention.
The meaning of the various reference numbers in the drawings:
1-a reaction tank, 2-a sedimentation tank, 3-a sewage tank and 4-a water inlet pump;
11-short-cut denitrification activated sludge, 12-filler, 13-first water inlet, 14-overflow port, 15-sludge return port, 16-screen and 17-stirring device;
21-a second water inlet, 22-a water outlet, 23-a sludge outlet, 24-a sludge outlet pipeline, 25-a sludge return pipeline and 26-a sludge return pump.
Detailed Description
The working principle of the invention is that according to the fixed growth of Anammox and the characteristic that the affinity of Anammox to nitrite nitrogen under low-concentration organic matters is higher than that of denitrifying bacteria, the sludge age of a reactor and the hydraulic retention time control are assisted, so that the denitrifying bacteria are promoted to utilize the organic matters in biological sewage and nitrate in wastewater containing nitrate nitrogen to perform partial denitrification, and once nitrite nitrogen is generated and anaerobic ammonia which can be fixed on a biological membrane to grow is oxidized and utilized and is removed together with ammonia nitrogen in domestic sewage to generate a small amount of nitrate nitrogen and nitrogen, thereby realizing the purpose of high-efficiency biological denitrification.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1
The embodiment discloses a biological denitrification device for coupling synchronous PD activated sludge with an Anammox biological membrane, which comprises a reaction tank 1 and a sedimentation tank 2 as shown in figure 1. The reaction tank 1 is of a closed structure and provides an anoxic environment, and short-range denitrification activated sludge 11 and a filler 12 are arranged in the reaction tank 1.
An anaerobic ammonium oxidation biological film cultured in advance is hung on the surface of the filler 12, and the filler 12 is uniformly distributed in the short-cut denitrification activated sludge 11. In the embodiment, the stirring device 17 is arranged in the reaction tank 1, and the filler 12 is uniformly mixed in the short-cut denitrification activated sludge 11 by stirring. The accumulation rate of nitrite in the short-cut denitrification activated sludge 11 of the embodiment can reach 60-70% after the short-cut denitrification activated sludge is cultured in advance.
Too much filler 12 causes poor mixing degree and aggregation during the operation of the system, while too little filler causes low treatment efficiency, and the filling rate of the filler 12 in the short-cut denitrification activated sludge 11 is 15-20%.
The reaction tank 1 is provided with a first water inlet 13, an overflow port 14 and a sludge return port 15, the first water inlet 13 is used for introducing nitrate sewage, and the overflow port 14 is provided with a screen 16 for preventing the filler 12 and a biological film on the surface of the filler from entering the sedimentation tank 2.
The sedimentation tank 2 is provided with a second water inlet 21, a water outlet 22 and a sludge outlet 23, the second water inlet 21 is connected with the overflow port 14, the sludge outlet 23 is connected with a sludge discharge pipeline 24 and a sludge return pipeline 25, the sludge return pipeline 25 is connected with the sludge return port 15, the sludge return pipeline 25 is provided with a sludge return pump 26, so that a part of sludge enters the reactor 1 again, and the rest sludge is discharged.
The filler 12 of the embodiment can be K3 filler or K5 filler, the diameter of the filler 12 is 2.5cm, and the specific surface area of the filler 12 is 500-800 m2/m3。
On the basis of the above device, the present embodiment further provides a sewage tank 3 for filling sewage containing nitrate, and the sewage tank 3 is connected with the first water inlet 13 through the water inlet pump 4.
Example 2
The embodiment discloses a biological denitrification method for coupling synchronous PD activated sludge with an Anammox biological membrane, which adopts a biological denitrification device for coupling synchronous PD activated sludge with an Anammox biological membrane, which is described in embodiment 1, to perform treatment, and specifically comprises the following steps:
injecting nitrate-containing sewage to be treated into a reaction tank 1, maintaining the hydraulic retention time HRT in the reaction tank 1 to be 10-12 h by controlling the flow rate of a water inlet pump 4, and completely mixing a filler 12 in short-cut denitrification activated sludge 11 by a stirring device 17;
the mixed liquid in the reaction tank 1 enters the sedimentation tank 2 through the overflow port 14 for mud-water separation, the separated supernatant is discharged out of the system through the water discharge port 22, one part of the settled sludge is discharged out of the system as residual sludge, and the other part of the settled sludge returns to the reaction tank 1 through the sludge return pipe 25; the sludge age SRT in the reaction tank 1 is 15-20 d by controlling the proportion of the return sludge and the excess sludge, and the sludge concentration is always controlled to be 2000-2500 mg/L.
The system of the reactor 1 of this example was operated at normal temperature.
Example 3
The embodiment adopts nitrate-containing sewage self-made by a laboratory, and the specific water quality of the sewage is as follows: NH (NH)4 +-N25mg/L,NO3 --N 30mg/L，COD 80mg/L。
In the embodiment, the device and the method of the embodiment 2 are adopted to denitrify the nitrate-containing sewage, wherein the effective volume of the reaction tank 1 is 3L, the short-cut denitrification activated sludge is taken from a short-cut denitrification SBR reactor which stably runs for at least 100 days in a laboratory, the accumulation rate of nitrite can be kept between 60 and 70 percent, and the sludge concentration of the reactor 1 reaches 2000 to 2500mg/L after the short-cut denitrification activated sludge is inoculated; the anaerobic ammonia oxidation inoculation filler 12 is taken from an upflow anaerobic sludge blanket SBR reactor which is stably operated for at least 510 days in a laboratory, and the activity of Anammox can reach 131.64mg NH4 +N/(L.d), and the filling ratio of filler 12 after inoculation is 15%.
The temperature in the reactor 1 is maintained at 25 ℃ by adjusting the constant temperature water bath box, the hydraulic retention time HRT in the reactor 1 is 12h by controlling the flow rate of the water inlet pump 4, the sludge age of the reactor is maintained at 15-20 d by manual sludge discharge, and the sludge concentration in the reactor is maintained at 2000-2500 mg/L. The reactor effluent quality was measured daily and the TN removal rate was calculated.
The change of the nitrogen concentration of inlet and outlet water during the experimental operation is shown in Table 1, the TN removal rate of final outlet water reaches 97.33%, and the TN concentration of the outlet water is only 1.47mg/L, which is lower than the outlet water quality of quasi-four types of surface water in the city of Xian. Therefore, the device and the method can realize stable and efficient biological denitrification of the sewage and the wastewater.
Table 1 example 1 reactor water quality parameters
| Name of project | COD(mg/L) | NH4 +-N(mg/L) | NO3 --N(mg/L) | TN(mg/L) |
| Quality of inlet water | 80 | 25 | 30 | 55 |
| Quality of effluent water | 25.94±5.28 | 0.89±0.79 | 0.46±0.31 | 1.47±0.88 |
| Removal Rate (%) | 67.61 | 96.44 | 98.47 | 97.33 |
Example 4
The embodiment adopts the water inlet of a certain sewage treatment plant in the city of Xian, the sewage received by the sewage treatment plant is industrial wastewater and domestic sewage of a certain electronic plant, and the concrete water quality parameters are as follows: NH4 +-N 7.13mg/L,NO3 -7.04mg/L of N and 32mg/L of COD, and collecting the sewage into a sewage tank 3.
In this example, the same denitrification was carried out on the nitrate-containing wastewater by the apparatus and method of example 2, wherein the effective volume of the reaction tank 1 was 3L, and the HRT, SRT and the internal temperature of the reactor 1 were controlled to 12h, 15d and 25 ℃ respectively. The short-cut denitrification activated sludge 11 is also taken from a short-cut denitrification SBR reactor which stably runs for at least 100 days in a laboratory, can keep 60-70% of nitrite accumulation rate, and enables the sludge concentration in the reactor 1 to reach 2000-2500 mg/L after inoculation; the anaerobic ammonia oxidation inoculation filler 12 is taken from an upflow anaerobic sludge blanket SBR reactor which is stably operated for at least 510 days in a laboratory, and the activity of Anammox can reach 131.64mg NH4 +-N/(L.d), the filling ratio of filler 12 is 15%.
The experimental results are shown in table 2, and the continuous experimental results show that: the TN concentration of the effluent is only 5.35mg/L after long-term operation, and the residual NH in the effluent4 +the-N can be further converted into nitrate nitrogen through nitrification in subsequent treatment in the sewage treatment process, and the water quality of the effluent is also lower than four types of water quality of surface level in the city of Xian.
Table 2 example 2 reactor water quality parameters
| Name of item | COD(mg/L) | NH4 +-N(mg/L) | NO3 --N(mg/L) | TN(mg/L) |
| Quality of inlet water | 32 | 7.13 | 7.04 | 14.17 |
| Quality of effluent water | 15.76 | 4.71 | 0.64 | 5.35 |
| Removal Rate (%) | 50.75 | 33.94 | 90.91 | 62.24 |
And (3) calculating the cost:
the original treatment process of the sewage treatment plant adopts the traditional nitrification-denitrification process, at least 80mg/LCOD (calculated by sodium acetate) needs to be added in the original process to maintain the normal operation of the denitrification process, and finally, the effluent nitrate nitrogen of 7.76 +/-1.52 mg/L is realized. Based on the total sewage treatment capacity of 4.5 ten thousand tons/day of the sewage treatment plant, the extra carbon source (1900 yuan/ton for example by industrial grade sodium acetate) of about 7665 tons/year can be saved, namely the carbon source cost of about 1456.4 ten thousand yuan per year. Meanwhile, about 2.42mg/L of ammonia nitrogen is removed by anammox, so that about 33.94 percent of aeration cost (about 0.057 yuan/ton) can be saved theoretically, about 93.62 ten thousand yuan/year can be saved, and in conclusion, the income can be increased by at least 1550.02 ten thousand yuan per year on the basis of the original profit.
In conclusion, the invention can economically and efficiently realize deep biological denitrification of actual nitrate-containing sewage by coupling the anaerobic ammonia oxidation biomembrane with the short-cut denitrification activated sludge.
Claims (7)
1. A biological denitrification device for coupling synchronous PD activated sludge with an Anammox biological membrane is characterized by comprising a reaction tank (1) and a sedimentation tank (2);
short-cut denitrification activated sludge (11) and fillers (12) are arranged in the reaction tank (1), the fillers (12) are distributed in the short-cut denitrification activated sludge (11), and anaerobic ammonia oxidation biological films which are cultured in advance are hung on the surfaces of the fillers (12);
the reaction tank (1) is provided with a first water inlet (13), an overflow port (14) and a sludge return port (15), and a screen (16) is arranged at the overflow port (14);
the sedimentation tank (2) is provided with a second water inlet (21), a water outlet (22) and a sludge outlet (23), the second water inlet (21) is connected with the overflow port (14), the sludge outlet (23) is connected with a sludge discharge pipeline (24) and a sludge backflow pipeline (25), and the sludge backflow pipeline (25) is connected with the sludge backflow port (15).
2. The synchronous PD activated sludge-coupled Anammox biofilm biological nitrogen removal unit of claim 1, wherein said packing (12) is K3 packing or K5 packing; the diameter of the filler (12) is 2.5cm, and the specific surface area of the filler (12) is 500-800 m2/m3。
3. The biological nitrogen removal device of the synchronous PD activated sludge coupled Anamox biofilm of claim 1, characterized in that the short-cut denitrification activated sludge (11) is pre-cultured and its nitrite nitrogen accumulation rate is 60% -70%.
4. The simultaneous PD activated sludge coupled Anammox biofilm biological nitrogen removal plant of claim 1, wherein the packing fraction of the filler (12) in the short-cut denitrification activated sludge (11) is between 15% and 20%.
5. The synchronous PD activated sludge coupled Anamox biofilm biological nitrogen removal device of claim 1, wherein a stirring device (17) is arranged in the reaction tank (1).
6. The synchronous PD activated sludge Anammox biofilm biological denitrification unit as in claim 1, characterized in that it further comprises a sewage tank (3), said sewage tank (3) being connected to the first water inlet (13) by means of a water inlet pump (4).
7. A biological denitrification method of a synchronous PD activated sludge coupled Anammox biological membrane is characterized in that a biological denitrification device of the synchronous PD activated sludge coupled Anammox biological membrane of any one of claims 1 to 6 is adopted for treatment, and the method specifically comprises the following steps:
injecting the nitrate-containing sewage to be treated into a reaction tank (1), maintaining the hydraulic retention time in the reaction tank (1) to be 10-12 h, and completely mixing a filler (12) in the short-cut denitrification activated sludge (11);
mixed liquid in the reaction tank (1) enters the sedimentation tank (2) through the overflow port (14) for mud-water separation, separated supernatant is discharged out of the system through the water discharge port (22), one part of the settled sludge is discharged out of the system as residual sludge, and the other part of the settled sludge returns to the reaction tank (1) through the sludge return pipeline (25); the sludge age in the reaction tank (1) is 15-20 d by controlling the proportion of the return sludge and the excess sludge, and the sludge concentration of the short-cut denitrification activated sludge (11) in the reaction tank (1) is 2000-2500 mg/L.
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