CN112744912A - Sulfur autotrophic denitrification biological filter, sewage treatment system and treatment method thereof - Google Patents
Sulfur autotrophic denitrification biological filter, sewage treatment system and treatment method thereof Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 76
- 230000001651 autotrophic Effects 0.000 title claims abstract description 70
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 70
- 239000011593 sulfur Substances 0.000 title claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000002245 particle Substances 0.000 claims abstract description 64
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000010802 sludge Substances 0.000 claims abstract description 45
- 239000000945 filler Substances 0.000 claims abstract description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 230000029087 digestion Effects 0.000 claims abstract description 13
- 239000011435 rock Substances 0.000 claims abstract description 12
- 239000010457 zeolite Substances 0.000 claims abstract description 11
- 235000019738 Limestone Nutrition 0.000 claims abstract description 10
- 239000006028 limestone Substances 0.000 claims abstract description 10
- 238000010992 reflux Methods 0.000 claims abstract description 4
- 238000004062 sedimentation Methods 0.000 claims description 24
- -1 nitrate nitrogen Chemical compound 0.000 claims description 18
- 230000032770 biofilm formation Effects 0.000 claims description 16
- 230000001079 digestive Effects 0.000 claims description 14
- NHNBFGGVMKEFGY-UHFFFAOYSA-N nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000005755 formation reaction Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 230000000813 microbial Effects 0.000 claims description 6
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 6
- 229910052683 pyrite Inorganic materials 0.000 claims description 6
- 239000011028 pyrite Substances 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 5
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical compound [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 claims description 4
- 244000005700 microbiome Species 0.000 claims description 4
- 241000894006 Bacteria Species 0.000 claims description 3
- 238000000855 fermentation Methods 0.000 claims description 3
- 230000004151 fermentation Effects 0.000 claims description 3
- 235000015097 nutrients Nutrition 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims 1
- 238000011068 load Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 241000276438 Gadus morhua Species 0.000 description 4
- 235000019516 cod Nutrition 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000000370 acceptor Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000000102 heterotrophic Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 244000052616 bacterial pathogens Species 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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 relates to a sulfur autotrophic denitrification biological filter, a sewage treatment system and a treatment method thereof. The sulfur autotrophic denitrification biological filter comprises a tank body and a filter filler arranged in the tank body; the filter packing includes: volcanic rock particles arranged on the bottom particles, limestone particles arranged on the volcanic rock particles, sulfur ore particles arranged on the limestone particles and zeolite particles with the same particle size arranged on the sulfur ore particles; the volume ratio of the four material particles is 1: 3. On the basis of the process flow of the traditional urban sewage treatment plant, the invention develops a new process for reducing the nitrogen load of the sewage treatment plant while ensuring the supply of the water inlet carbon source of the sewage treatment plant by adding a sulfur autotrophic denitrification biological filter in the sludge treatment stage and refluxing the treated sludge digestion liquid to the water inlet through process improvement, and has important environmental and ecological significance for the treatment of domestic sewage in China.
Description
Technical Field
The invention relates to a sewage treatment system, in particular to a sulfur autotrophic denitrification biological filter, a sewage treatment system and a treatment method thereof.
Background
Nitrogen is one of the indispensable elements for animal and plant growth, but also one of the key indicators for determining water quality. Excessive discharge thereof can cause a series of environmental problems and even harm human health. Biological denitrification is an economical and efficient means and is therefore widely used in sewage treatment plants worldwide. The traditional heterotrophic denitrification method is to reduce nitrate into N by using organic matters as electron acceptors through heterotrophic bacteria2. However, at present, a considerable part of sewage treatment plants in China have low C/N of inlet water, and the denitrification process is often limited by insufficient carbon sources, so that the sewage discharge reaching the standard is difficult. The problem that the effluent of a sewage treatment plant does not reach the standard is the common problem at present; the water amount of the sludge digestive liquid only accounts for 0.5-2% of the water inlet amount of the sewage treatment plant, but the nitrogen content accounts for 10-25% of the nitrogen load of the inlet water, so that the reduction of the nitrogen content in the sludge digestive liquid is of great significance for reducing the nitrogen load of the inlet water.
In recent years, researchers at home and abroad develop a great deal of research on how to solve the problem that sewage treatment does not reach the standard due to low carbon-nitrogen ratio of inlet water of a sewage treatment plant. At present, the main solutions to the problem of low carbon-nitrogen ratio are to develop new technology, improve process flow and the like. For example, a nitrification filter and a denitrification filter are added after the secondary effluent; an oxidation process; a membrane separation method; the methods such as the artificial wetland and the like can effectively remove nitrogen in secondary effluent of a sewage treatment plant, but all have obvious defects. The denitrification filter, the artificial wetland and the like can greatly increase the occupied area of a sewage treatment plant, and increase the operation cost and the infrastructure cost; the oxidation method needs to add chemical agents into the wastewater, although the initial investment is low, the operation cost is high, and secondary pollution can be caused after treatment; the membrane separation method has the problems of membrane pollution, high requirements of partial membrane separation technology on the quality of wastewater and the like.
Disclosure of Invention
The invention aims to provide a sulfur autotrophic denitrification biological filter to solve the problem of poor sewage denitrification effect.
The invention also aims to provide a sewage treatment system based on the sulfur autotrophic denitrification biological filter to solve the problem of high nitrogen load of inlet water of a sewage treatment plant.
The invention also aims to provide a sewage treatment method based on the sulfur autotrophic denitrification biological filter so as to realize the standard discharge of a sewage treatment plant.
One of the objects of the invention is achieved by: a sulfur autotrophic denitrification biological filter comprises a tank body and a filter filler filled in the tank body; the filter filler comprises volcanic rock particles with the particle size of 11-23 mm, limestone particles with the particle size of 15-21 mm, pyrite particles with the particle size of 7-11 mm and zeolite particles with the particle size of 8-17 mm, and the volume ratio of the four filler particles is 1: 3.
Preferably, the lower part of the side wall of the tank body is connected with a water inlet pipe, the upper part of the side wall of the tank body is connected with a water outlet pipe, and the filling amount of the filtering filler is controlled to be lower than the setting height of the water outlet pipe on the top surface of the filler, so that the water outlet is prevented from being blocked, the loss of the filler in the tank body is avoided, and the water outlet is smooth.
Preferably, the water inlet pipe is inserted into the tank body, so that the inlet water is gradually filtered from the bottom of the whole tank body upwards, and a better filtering effect is achieved.
The second purpose of the invention is realized by the following steps: a sewage treatment system comprises a primary sedimentation tank, a biological treatment section, a secondary sedimentation tank, a sludge concentration tank, an anaerobic digestion tank and a nitrification tank, and is characterized by also comprising a sulfur autotrophic denitrification biological filter, wherein the water outlet end of the nitrification tank is connected with the water inlet pipe of the sulfur autotrophic denitrification biological filter, and the water outlet pipe of the sulfur autotrophic denitrification biological filter is connected to the water inlet pipe of the system;
comprises a tank body and a filter filler filled in the tank body; the filter filler comprises volcanic rock particles with the particle size of 11-23 mm, limestone particles with the particle size of 15-21 mm, pyrite particles with the particle size of 7-11 mm and zeolite particles with the particle size of 8-17 mm, and the volume ratio of the four filler particles is 1: 3.
In the sulfur autotrophic denitrification biological filter, nitrate is used as an electron acceptor, and sulfide (such as H)2S，S2O3 2-And S) is oxidized to SO by autotrophic denitrifying bacteria4 2-While the nitrate is reduced to N2The reaction equation is shown as the following formula:
1.06 NO- 3+1.11S+0.3CO2+0.785H2O → 0.06C5H7O2N+0.5N2+1.11SO4 2-+1.16H+ (1)
in addition, the pH value is reduced and the alkalinity is continuously consumed in the sewage treatment process, so limestone is added into the biological filter tank system to maintain the pH value in the sewage treatment process; meanwhile, a part of inorganic carbon source is provided for the sulfur autotrophic denitrification, and the reaction equation is shown as the following formula:
CaCO3 + H+ → Ca2+ + HCO3 - (2)
the sewage treatment system disclosed by the invention is based on the traditional sewage treatment plant, and the digestive juice in the sludge digestion stage is subjected to nitrification and sulfur autotrophic denitrification for denitrification and then flows back to the inlet water of the sewage treatment system, so that the proportion of the inlet water to a nitrogen source is reduced, the carbon-nitrogen ratio is improved, and the denitrification efficiency in the biological treatment stage is further improved; simultaneously treating sludge digestive juice which has high ammonia nitrogen and low carbon nitrogen ratio and contains a large amount of pathogenic microorganisms.
The third purpose of the invention is realized by the following steps: a sewage treatment method based on a sulfur autotrophic denitrification biological filter comprises the following steps:
a. constructing the sewage treatment system, and performing microbial acclimation and biofilm formation treatment on a sulfur autotrophic denitrification biological filter in the sewage treatment system;
b. the sewage enters a primary sedimentation tank of a sewage treatment system through a grid for primary sedimentation separation;
c. the effluent of the primary sedimentation tank enters a biological treatment section for biological treatment;
d. the effluent of the biological treatment section enters a secondary sedimentation tank for secondary sedimentation separation;
e. one part of sludge in the secondary sedimentation tank flows back to the anoxic tank of the biological treatment section, the other part of sludge enters the sludge concentration tank and is concentrated by gravity, and the sludge reflux ratio is 25-100%;
f. the sludge in the sludge concentration tank enters an anaerobic digestion tank for medium-temperature fermentation;
h. the digestive fluid in the anaerobic digestion tank automatically flows into the nitrification tank through gravity, and the ammonia nitrogen component in the sludge digestive fluid is oxidized into nitrate nitrogen;
i. the effluent of the nitrification tank enters the sulfur autotrophic denitrification biological filter from the bottom, nitrate is removed through sulfur autotrophic denitrification bacteria attached to zeolite and volcanic rock, and the treated water flows out from the top of the sulfur autotrophic denitrification biological filter;
j. the effluent of the sulfur autotrophic denitrification biological filter flows back to a water inlet pipeline of the sewage treatment system.
The microorganism domestication and biofilm formation treatment mode in the step a is that activated sludge of a sewage treatment plant is used as inoculated sludge, nutrient solution with a carbon-nitrogen ratio of 400: 5 is introduced at room temperature environment, the sulfur autotrophic denitrification biological filter is domesticated and biofilm formation is carried out, after the concentration of effluent nitrate nitrogen is stable, the carbon source proportion is reduced, and after the effluent nitrate nitrogen is stabilized again, the carbon source proportion is continuously reduced; the above steps are circulated until all carbon sources are eliminated; completing film formation when the concentration of the nitrate and the nitrogen in the effluent is stable and reaches the standard; during the period, the effluent of the sewage treatment system flows back completely until the film formation is finished.
The treatment time of microbial acclimation and biofilm formation treatment of the sulfur autotrophic denitrification biological filter is 35-50 d, and the water power stays for 18h after biofilm formation is completed.
On the basis of the treatment process of the traditional sewage treatment plant, the invention adds a sulfur autotrophic denitrification biological filter behind the sludge anaerobic digestion tank in the sludge treatment stage through process improvement, can further reduce nitrogen load under the condition of ensuring the supply of influent carbon source, and has important environmental and ecological significance for the treatment of domestic sewage in China.
The sewage treatment method of the invention utilizes the sulfur autotrophic denitrification technology to convert nitrogen in sludge digestive juice into N2And (4) removing, thereby reducing the water inlet nitrogen load of a sewage treatment plant: in the sulfur autotrophic denitrification biological filter, nitrate is used as an electron acceptor, and sulfide (such as H)2S，S2O3 2-And S) is oxidized to SO by autotrophic denitrifying bacteria4 2-While the nitrate is reduced to N2(ii) a In addition, the process can cause the reduction of Ph and the consumption of alkalinity, so limestone is added into the biological filter tank system to maintain the pH, and a part of inorganic carbon source is provided for the sulfur autotrophic denitrification; furthermore volcanic rocks and zeolites are commonly used as packing materials, which can provide more space for microorganisms on the surface and induce facultative anaerobic zones relative to modified biosuspension fillers.
Experiments prove that the average removal rate of the sulfur autotrophic denitrification biological filter on the total nitrogen reaches 82 percent when the hydraulic retention time is 18 hours. At 20X 104 m3The contribution of the sulfur autotrophic denitrification biofilter to the C/N improvement of the sewage treatment plant is calculated by taking the municipal sewage plant of/d as an example. The flow of the sludge digestive juice is calculated by 1 percent of the total water volume of the municipal sewage plant, namely the water volume of the sludge digestive juice is 2000m3D, NH of sludge digestion liquid4 +-the nitrogen load of the sludge digest is 2000Kg/d =2T/d when the N concentration is 1000mg/L and the total nitrogen TN of the raw water of the municipal sewage plant is 50 mg/L; the raw water nitrogen load of the urban sewage plant is 50g/m3×20×104m3D =10000 Kg/d = 10T/d. The sludge digest accounted for 16.7% of the nitrogen load of the municipal sewage plant, which was 20% of the nitrogen load of the raw water. The sulfur autotrophic denitrification biological filter can remove 82% of total nitrogen in sludge digestive juice, only consumes about 10% of carbon source, and obviously improves the C/N ratio of inlet water.
Drawings
FIG. 1 is a flow chart of the sewage treatment process of the present invention.
FIG. 2 is a schematic structural diagram of the sulfur autotrophic denitrification biological filter.
Detailed Description
Example 1:
as shown in figure 2, the sulfur autotrophic denitrification biological filter comprises a tank body 1 and a filter filler 2 filled in the tank body; the filter filler 2 comprises volcanic rock particles with the particle size of 11-23 mm, limestone particles with the particle size of 15-21 mm, pyrite particles with the particle size of 7-11 mm and zeolite particles with the particle size of 8-17 mm, and the volume ratio of the four filler particles is 1: 3. The lower part of the side wall of the tank body 1 is connected with a water inlet pipe 3, and the water inlet pipe is inserted into the tank body. The upper part of the side wall of the tank body 1 is connected with a water outlet pipe 4, and the filling amount of the filter filler 2 in the tank body 1 is controlled to be lower than the setting height of the water outlet pipe 4 on the top surface of the filler.
Example 2:
as shown in figure 1, the sewage treatment system comprises a primary sedimentation tank, a biological treatment section, a secondary sedimentation tank, a sludge concentration tank, an anaerobic digestion tank, a nitrification tank and a sulfur autotrophic denitrification biological filter, wherein the water outlet end of the nitrification tank is connected with the water inlet pipe of the sulfur autotrophic denitrification biological filter, and the water outlet pipe of the sulfur autotrophic denitrification biological filter is connected to the water inlet pipe of the system. The biological treatment section in the sewage treatment system comprises an anaerobic tank, an anoxic tank and an aerobic tank.
As shown in FIG. 2, the sulfur autotrophic denitrification biological filter in the sewage treatment system of the present invention comprises a tank body 1 and a filter filler 2 filled in the tank body; the filter filler 2 comprises volcanic rock particles with the particle size of 11-23 mm, limestone particles with the particle size of 15-21 mm, pyrite particles with the particle size of 7-11 mm and zeolite particles with the particle size of 8-17 mm, and the volume ratio of the four filler particles is 1: 3. The lower part of the side wall of a tank body 1 of the sulfur autotrophic denitrification biological filter is connected with a water inlet pipe 3, and the water inlet pipe is inserted into the tank body. The upper part of the side wall of the tank body 1 is connected with a water outlet pipe 4, and the filling amount of the filter filler 2 in the tank body 1 is controlled to be lower than the setting height of the water outlet pipe 4 on the top surface of the filler.
The sewage treatment method based on the sulfur autotrophic denitrification biological filter comprises the following steps:
1. constructing the sewage treatment system in the embodiment 2, and performing microbial acclimation and biofilm formation treatment on a sulfur autotrophic denitrification biological filter in the sewage treatment system;
2. the sewage enters a primary sedimentation tank of a sewage treatment system through a grid for primary sedimentation separation;
3. the effluent of the primary sedimentation tank enters a biological treatment section for biological treatment;
4. the effluent of the biological treatment section enters a secondary sedimentation tank for secondary sedimentation separation;
5. one part of sludge in the secondary sedimentation tank flows back to the anoxic tank of the biological treatment section, the other part of sludge enters the sludge concentration tank and is concentrated by gravity, and the sludge reflux ratio is 25-100%;
6. the sludge in the sludge concentration tank enters an anaerobic digestion tank for medium-temperature fermentation;
7. the digestive fluid in the anaerobic digestion tank automatically flows into the nitrification tank through gravity, and the ammonia nitrogen component in the sludge digestive fluid is oxidized into nitrate nitrogen;
8. the effluent of the nitrification tank enters the sulfur autotrophic denitrification biological filter from the bottom, nitrate is removed through sulfur autotrophic denitrification bacteria attached to zeolite and volcanic rock, and the treated water flows out from the top of the sulfur autotrophic denitrification biological filter;
9. the effluent of the sulfur autotrophic denitrification biological filter flows back to a water inlet pipeline of the sewage treatment system.
The microorganism domestication and biofilm formation treatment mode in the step 1 is that activated sludge of a sewage treatment plant is used as inoculated sludge, nutrient solution with the carbon-nitrogen ratio of 400: 5 is introduced at room temperature, the sulfur autotrophic denitrification biological filter is domesticated and biofilm formation is carried out, after the concentration of effluent nitrate nitrogen is stable, the carbon source proportion is reduced, and after the effluent nitrate nitrogen is stabilized again, the carbon source proportion is continuously reduced; the above steps are circulated until all carbon sources are eliminated; completing film formation when the concentration of the nitrate and the nitrogen in the effluent is stable and reaches the standard; during the period, the effluent of the sewage treatment system flows back completely until the film formation is finished. The treatment time of microbial acclimation and biofilm formation treatment of the sulfur autotrophic denitrification biological filter is 35-50 d, and the water power stays for 18h after biofilm formation is completed.
Application example 1 of the present invention: the municipal wastewater of the actual sewage treatment plant is treated by using the operation mode. The biofilm formation stage of 41 days is carried out before the sulfur autotrophic denitrification biological filter is formally operated. In order to verify the best efficiency of the sulfur autotrophic denitrification biological filter in winter, the formal operation of the sulfur autotrophic denitrification biological filter is divided into three stages, and each stage is operated for 40 days. Each stage is not temperature controlled, i.e. the water temperature changes following the local weather changes. The hydraulic retention time of the first stage is 6 hours, the hydraulic retention time of the second stage is 12 hours, and the hydraulic retention time of the third stage is 18 hours.
The influent water of the sulfur autotrophic denitrification biological filter is tail water of a municipal sewage treatment plant, and the influent water quality characteristics are shown in table 1.
Table 1: quality of inlet water
When the sewage treatment system operates stably, the operation result is as follows: first stage on TN and NO3The average removal efficiency of N is stable, 71.2% and 73.4%, respectively; second stage on TN and NO3The average removal of-N drops to 52.3% and 50.6%, respectively; third stage on TN and NO3The average removal of-N is optimal, 82.6% and 86.1%, respectively. NH of inlet and outlet water during operation4 +The concentration of N is stabilized to be about 0.7 mg/L; the average COD concentration of the inlet water is 24.6mg/L, and the average COD concentration of the outlet water is 21.3mg/L, which is slightly reduced. Therefore, the sewage treatment method can obviously reduce the nitrogen load in water, the removal rate reaches 80 percent, and the carbon source supply in water is not influenced.
Application example 2 of the present invention: the tail water of the simulated urban domestic sewage treatment plant is treated by running the device and the application example 1 of the invention under the same conditions, and the inlet water quality characteristics are shown in the table 2.
Table 2: quality of inlet water
When the sewage treatment system operates stably, the operation result is as follows: first stage on TN and NO3The average removal efficiency of N is stable, 80.2% and 83.3%, respectively; second stage on TN and NO3The average removal of-N decreased to 53.9% and 51.5%, respectively; third stage on TN and NO3The average removal rate of-N reaches the optimum score87.4% and 91.2% respectively. NH of inlet and outlet water during operation4 +The concentration of N is stabilized to be about 0.85 mg/L; the average COD concentration of the inlet water is 32mg/L, and the average COD concentration of the outlet water is 30.4mg/L, which is slightly reduced. The method can obviously reduce the nitrogen load in the water, the removal rate reaches 87%, and the carbon source supply in the water is not influenced.
Claims (10)
1. A sulfur autotrophic denitrification biological filter is characterized by comprising a tank body and a filter filler filled in the tank body; the filter filler comprises volcanic rock particles with the particle size of 11-23 mm, limestone particles with the particle size of 15-21 mm, pyrite particles with the particle size of 7-11 mm and zeolite particles with the particle size of 8-17 mm, and the volume ratio of the four filler particles is 1: 3.
2. A sulfur autotrophic denitrification biological filter according to claim 1, wherein a water inlet pipe is connected to the lower portion of the side wall of the tank body, a water outlet pipe is connected to the upper portion of the side wall of the tank body, and the filling amount of the filter filler is controlled to be lower than the setting height of the water outlet pipe on the top surface of the filler.
3. A sulfur autotrophic denitrification biological filter according to claim 1, wherein the water inlet pipe is inserted into the tank interior.
4. A sewage treatment system comprises a primary sedimentation tank, a biological treatment section, a secondary sedimentation tank, a sludge concentration tank, an anaerobic digestion tank and a nitrification tank, and is characterized by also comprising a sulfur autotrophic denitrification biological filter, wherein the water outlet end of the nitrification tank is connected with the water inlet pipe of the sulfur autotrophic denitrification biological filter, and the water outlet pipe of the sulfur autotrophic denitrification biological filter is connected to the water inlet pipe of the system;
the sulfur autotrophic denitrification biological filter comprises a tank body and a filter filler filled in the tank body; the filter filler comprises volcanic rock particles with the particle size of 11-23 mm, limestone particles with the particle size of 15-21 mm, pyrite particles with the particle size of 7-11 mm and zeolite particles with the particle size of 8-17 mm, and the volume ratio of the four filler particles is 1: 3.
5. The wastewater treatment system of claim 1, wherein the biological treatment section comprises an anaerobic tank, an anoxic tank, and an aerobic tank.
6. A sulfur autotrophic denitrification biological filter according to claim 4 or 5, wherein a water inlet pipe is connected with the lower portion of the side wall of the tank body of the sulfur autotrophic denitrification biological filter, a water outlet pipe is connected with the upper portion of the side wall of the tank body, and the filling amount of the filter filler is controlled to be lower than the setting height of the water outlet pipe on the top surface of the filler.
7. A sulfur autotrophic denitrification biological filter according to claim 4 or 5, wherein the water inlet pipe is inserted into the interior of the tank.
8. A sewage treatment method based on a sulfur autotrophic denitrification biological filter is characterized by comprising the following steps:
a. constructing a sewage treatment system according to any one of claims 4 to 7, and performing microbial acclimation and biofilm formation treatment on a sulfur autotrophic denitrification biofilter in the sewage treatment system;
b. the sewage enters a primary sedimentation tank of a sewage treatment system through a grid for primary sedimentation separation;
c. the effluent of the primary sedimentation tank enters a biological treatment section for biological treatment;
d. the effluent of the biological treatment section enters a secondary sedimentation tank for secondary sedimentation separation;
e. one part of sludge in the secondary sedimentation tank flows back to the anoxic tank of the biological treatment section, the other part of sludge enters the sludge concentration tank and is concentrated by gravity, and the sludge reflux ratio is 25-100%;
f. the sludge in the sludge concentration tank enters an anaerobic digestion tank for medium-temperature fermentation;
h. the digestive fluid in the anaerobic digestion tank automatically flows into the nitrification tank through gravity, and the ammonia nitrogen component in the sludge digestive fluid is oxidized into nitrate nitrogen;
i. the effluent of the nitrification tank enters the sulfur autotrophic denitrification biological filter from the bottom, nitrate is removed through sulfur autotrophic denitrification bacteria attached to zeolite and volcanic rock, and the treated water flows out from the top of the sulfur autotrophic denitrification biological filter;
j. the effluent of the sulfur autotrophic denitrification biological filter flows back to a water inlet pipeline of the sewage treatment system.
9. The sewage treatment method according to claim 8, wherein the microorganism acclimatization and biofilm formation treatment in the step a is that activated sludge of a sewage treatment plant is used as inoculated sludge, a nutrient solution with a carbon-nitrogen ratio of 400: 5 is introduced at room temperature, the sulfur autotrophic denitrification biological filter is acclimatized and biofilm formation is carried out, after the concentration of effluent nitrate nitrogen is stable, the proportion of a carbon source is reduced, and after the effluent nitrate nitrogen is stabilized again, the proportion of the carbon source is continuously reduced; the above steps are circulated until all carbon sources are eliminated; completing film formation when the concentration of the nitrate and the nitrogen in the effluent is stable and reaches the standard; during the period, the effluent of the sewage treatment system flows back completely until the film formation is finished.
10. The sewage treatment method according to claim 9, wherein the treatment time of the microbial acclimation and biofilm formation treatment of the sulfur autotrophic denitrification biological filter is 35-50 days, and the water power stays for 18 hours after the biofilm formation is completed.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114620907A (en) * | 2022-04-15 | 2022-06-14 | 合肥工业大学 | Autotrophic deep denitrification method for producing hydrogen sulfide by using sludge |
| CN115259351A (en) * | 2022-09-29 | 2022-11-01 | 山东国一中永环保技术服务有限公司 | Nano ceramic-micro-oxysulfide-coupled double-membrane-tower sewage treatment system |
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