CN113149215A - Middle-placed aeration denitrification treatment method for papermaking wastewater - Google Patents
Middle-placed aeration denitrification treatment method for papermaking wastewater Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005273 aeration Methods 0.000 title claims abstract description 26
- 239000002351 wastewater Substances 0.000 title claims description 19
- 239000010865 sewage Substances 0.000 claims abstract description 90
- 239000010802 sludge Substances 0.000 claims abstract description 43
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- -1 CO)3 2- Chemical class 0.000 description 1
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 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
- C02F3/30—Aerobic and anaerobic 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
- C02F3/02—Aerobic 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
- C02F3/28—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
- C02F3/30—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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a middle-placed aeration denitrification treatment method for papermaking sewage. The method comprises the following steps that firstly, sewage enters an IC reactor after being treated by a hydrolytic acidification tank, and is subjected to anaerobic treatment by the IC reactor; secondly, the sewage treated by the IC reactor enters a primary aerobic tank for ammoniation and nitration; thirdly, the sewage treated by the first-stage aerobic tank enters an anoxic tank for denitrification treatment; fourthly, the sewage treated by the anoxic tank enters a secondary aerobic tank for ammoniation and nitration treatment; and fifthly, enabling the sewage treated by the secondary aerobic tank to enter a secondary sedimentation tank for sludge-water separation, separating and concentrating the activated sludge by the secondary sedimentation tank, wherein a part of the activated sludge flows back to the primary aerobic tank, and is mixed with the sewage treated by the IC reactor and then enters the primary aerobic tank. The invention has high total nitrogen removal rate, and the denitrification process can be carried out in the existing aeration tank without building an additional tank body, thereby saving the occupied area, being suitable for compact enterprises and having lower operation cost.
Description
The technical field is as follows:
the invention relates to the technical field of sewage treatment, in particular to a middle-placed aeration denitrification treatment method for papermaking sewage.
Background art:
with the promulgation of the discharge Standard of Water pollutants for the paper industry (GB3544-2008), compared with the discharge Standard of Water pollutants for the paper industry (GB3544-2001), the new Standard not only improves CODCr、 BOD5And SS and AOX, and the control of indexes such as chromaticity, ammonia nitrogen, total phosphorus, dioxin and the like is also newly added. As is well known, the paper making industry has large water consumption and serious pollution, and is always the key direction of environmental protection in China. Although the pollution load of the wastepaper regeneration papermaking wastewater is relatively lighter compared with the pulping process directly utilizing the plant fiber, the wastepaper regeneration papermaking wastewater still far exceeds the discharge standard. Because the pulping and papermaking wastewater has high pollutant concentration and poor biodegradability, the biodegradability needs to be improved by hydrolysis acidification after passing through a pretreatment system, and then passes through an anaerobic system, an aerobic system, an advanced treatment system and the like, so that the novel discharge standard is finally reached. In the pulping and papermaking process, except for the pulping wastewater of an ammonium sulfite method, chemical agents containing nitrogen and phosphorus are usually rarely added, but in order to ensure the efficient and stable operation of an anaerobic treatment system, sufficient nutrient substances (nitrogen fertilizer and phosphate fertilizer) need to be supplemented from the outside for anaerobic microorganisms to utilize.
The applicant adopts an A-O-A process denitrification process, namely anaerobic-aerobic-anaerobic treatment, in the paper making sewage treatment at present, and the treatment process has the defects of small sewage treatment amount and limited capacity. Therefore, through continuous experiments, the inventor utilizes the existing process facilities to transform and upgrade the existing process on the premise of shortage of land use, and provides the following technical scheme.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provides a middle aeration denitrification treatment method for papermaking wastewater.
In order to solve the technical problems, the invention adopts the following technical scheme: a middle-placed aeration denitrification treatment method for papermaking sewage comprises the following steps that firstly, the sewage enters an IC reactor after being treated by a hydrolysis acidification tank, and is subjected to anaerobic treatment by the IC reactor; secondly, the sewage treated by the IC reactor enters a primary aerobic tank for ammoniation and nitration; thirdly, the sewage treated by the first-stage aerobic tank enters an anoxic tank for denitrification treatment; fourthly, the sewage treated by the anoxic tank enters a secondary aerobic tank for ammoniation and nitration treatment; and fifthly, enabling the sewage treated by the secondary aerobic tank to enter a secondary sedimentation tank for sludge-water separation, separating and concentrating the activated sludge by the secondary sedimentation tank, wherein a part of the activated sludge flows back to the primary aerobic tank and is mixed with the sewage treated by the IC reactor and then enters the primary aerobic tank, namely, the mixed liquid of the sewage treated by the IC reactor and the sludge returned by the secondary sedimentation tank enters the primary aerobic tank through a mixed liquid inlet, and the rest sludge enters a sludge treatment system for subsequent treatment.
Further, in the above technical scheme, in the first step, after the sewage is treated by the hydrolysis acidification tank, a part of the sewage is conveyed to the first-stage aerobic tank through the surpassing pipe.
Further, in the above technical scheme, in the first step, after the sewage is treated by the hydrolysis acidification tank, part of the sewage is conveyed to the anoxic tank through the surpassing pipe.
Furthermore, in the technical scheme, the mixing volume ratio of the sewage treated by the IC reactor and the activated sludge refluxed by the secondary sedimentation tank is as follows.
Further, in the above technical scheme, the primary aerobic tank and the secondary aerobic tank are aeration tanks.
Further, in the above technical scheme, the sewage treated by the IC reactor flows through the primary aerobic tank, the anoxic tank, and the secondary aerobic tank in a self-flowing manner in sequence.
Further, in the above technical scheme, the bottom of the primary aerobic tank, the anoxic tank and the secondary aerobic tank is provided with a sludge discharge port.
Furthermore, in the above technical scheme, according to the sewage flowing direction, the first-stage aerobic tank is sequentially provided with the circulating pump and the sand discharge pump, that is, the circulating pump is close to the circulating liquid inlet, and the sand discharge pump is close to the anoxic tank.
Furthermore, in the above technical solution, the inlet of the circulation pump is communicated with the inlet of the circulation liquid, the outlet of the circulation pump is connected in parallel with a plurality of branch pipes, the branch pipes are provided with a plurality of openings, and the opening direction is inclined upwards along the sewage flow direction.
Furthermore, in the above technical scheme, the inlet of the sand discharge pump is communicated with a plurality of sand discharge branch pipes, the sand discharge branch pipes are fixed at the bottom of the first-stage aerobic tank, and the sand discharge branch pipes are provided with openings.
The process principle of the invention is as follows: the method is characterized in that the existing A-O-A process denitrification process is improved, and an O-A-O process is adopted, namely, sewage flows into A first-stage aerobic tank automatically after being subjected to anaerobic treatment by an IC reactor, and ammoniA nitrogen (NH4-N) in the sewage after the anaerobic treatment is converted into nitronitrogen (NO3-N) in the first-stage aerobic tank under the action of nitrite bacteriA and nitrate bacteriA, so that the sewage output by the first-stage aerobic tank does not contain ammoniA nitrogen basically, and most of the ammoniA nitrogen is converted into the nitronitrogen. The sewage output by the first-level aerobic tank enters the anoxic tank again to undergo denitrification reaction, the nitro-nitrogen can be removed from the sewage, the purpose of reducing the total nitrogen is achieved, and finally the sewage flows to the second-level aerobic tank automatically, so that pollutants in the water are further removed and reduced, and the environment-friendly risk of exceeding the standard in discharge is reduced. And meanwhile, the sludge in the secondary sedimentation tank flows back, so that the nitrification and denitrification effects are further improved. In addition, the backflow of the sludge is easy to cause sand accumulation and precipitation, so that the retention time of sewage is reduced, and equipment is easy to damage.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the O-A-O process, directly utilizes the organic matters in the anaerobic output water of the IC reactor, does not need to add an external carbon source, not only degrades the organic matters in the inlet water while denitrifying, but also saves the aeration amount in the aerobic treatment.
2. The sewage in the invention directly flows through the primary aerobic tank, the anoxic tank and the secondary aerobic tank in a self-flowing manner in turn, no additional equipment is needed, and the energy consumption is reduced.
3. The invention has high total nitrogen removal rate, and the denitrification process can be carried out in the existing aeration tank without building an additional tank body, thereby saving the occupied area, being suitable for compact enterprises and having lower operation cost.
Description of the drawings:
FIG. 1 is a schematic diagram of a system for the treatment process of the present invention;
FIG. 2 is a schematic diagram of the structure of a circulating pump and a sand pump in the invention.
The specific implementation mode is as follows:
the invention is further illustrated below with reference to specific embodiments and the accompanying drawings.
The invention provides a middle-placed aeration denitrification treatment method for papermaking sewage, which is shown in a combined figure 1 and comprises the following facilities: a hydrolysis acidification tank 1, an IC reactor 2, a primary aerobic tank 3, an anoxic tank 4, a secondary aerobic tank 5 and a secondary sedimentation tank 6. Wherein, the hydrolysis acidification tank 1 is a sewage pretreatment facility and is used for carrying out acidification treatment on sewage so as to improve the biodegradability of the wastewater. The IC reactor 2 is an anaerobic reaction processor for anaerobic treatment of sewage. The primary aerobic tank 3, the anoxic tank 4 and the secondary aerobic tank 5 are used as the nitrification tank of the invention, and the existing aeration tank can be directly adopted for modification without additionally building a tank body. For the anoxic pond 4, the original aeration equipment is stopped. The secondary sedimentation tank 6 is used for carrying out sludge-water separation on the sewage subjected to the nitrification treatment.
An overtaking pipe is arranged between the hydrolysis acidification tank 1 and the first-stage aerobic tank 3 and the anoxic tank 4, and partial sewage treated by the hydrolysis acidification tank 1 can be conveyed to the first-stage aerobic tank 3 and the anoxic tank 4 through the overtaking pipe, so that the system load of the IC reactor 2 can be relieved on one hand, and meanwhile, a carbon source is provided for anoxic denitrification reaction in the anoxic tank 4.
In addition, a return channel is arranged between the secondary sedimentation tank 6 and the primary aerobic tank 3, so that a part of the concentrated activated sludge separated by the secondary sedimentation tank 6 can return to the primary aerobic tank 3, and the part of the concentrated activated sludge is mixed with sewage treated by the IC reactor 2 and then enters the primary aerobic tank 3.
The treatment method of the present invention will be described in detail with reference to FIG. 1. The treatment method of the invention comprises the following steps.
Firstly, sewage enters an IC reactor 2 after being treated by a hydrolytic acidification tank 1 and is subjected to anaerobic treatment by the IC reactor 2.
In the first step, after the sewage is treated by the hydrolysis acidification tank 1, part of the sewage is conveyed to the primary aerobic tank 3 through the surpassing pipe. Thus, when the IC reactor 2 is overloaded, the load of the anaerobic treatment system of the IC reactor 2 can be reduced through the pipeline passing link. In addition, after the sewage is treated by the hydrolysis acidification tank 1, part of the sewage is conveyed to the anoxic tank 4 through the surpassing pipe. Thus, a carbon source can be provided for the anoxic denitrification reaction in the anoxic tank 4, and the growth of the activated sludge is promoted.
And secondly, the sewage treated by the IC reactor 2 enters a primary aerobic tank 3 for ammoniation and nitration.
And thirdly, the sewage treated by the first-stage aerobic tank 3 enters an anoxic tank 4 for denitrification treatment.
Fourthly, the sewage treated by the anoxic tank 4 enters a secondary aerobic tank 5 for ammoniation and nitration;
and fifthly, the sewage treated by the secondary aerobic tank 5 enters a secondary sedimentation tank 6 for sludge-water separation, the activated sludge separated and concentrated by the secondary sedimentation tank 6 returns to the primary aerobic tank 3, the activated sludge is mixed with the sewage treated by the IC reactor 2 and then enters the primary aerobic tank 3, namely, the mixed liquid of the sewage treated by the IC reactor 2 and the sludge returned by the secondary sedimentation tank 6 enters the primary aerobic tank 3 through a mixed liquid inlet, and the rest sludge enters a sludge treatment system for subsequent treatment, for example, the sludge can be dehydrated and then is conveyed to an incinerator for combustion and power generation.
In the second step, the sewage entering the primary aerobic tank 3 is a mixed liquid, i.e., a mixed liquid of the sewage treated by the IC reactor 2 and the sludge returned by the secondary sedimentation tank 6, and the mixed liquid enters the primary aerobic tank 3 through a mixed liquid inlet. Wherein, the mixing volume ratio of the sewage treated by the IC reactor 2 and the active sludge refluxed by the secondary sedimentation tank 6 is 1: 1.
In the first step, after the mixed liquid of the sewage treated by the IC reactor 2 and the sludge returned from the secondary sedimentation tank 6 enters the primary aerobic tank 3, the sewage is maintained in the primary aerobic tank 3 for a sufficient time, generally over 24 hours, and the oxygen supply is ensured. Therefore, by means of the adsorption and decomposition of the organic matters of the aerobic microorganisms, most of the organic matters in the wastewater are removed, and the degradation of the COD in the wastewater is ensured to reach the technological requirement index.
The effluent of the first-stage aerobic tank 3 automatically flows into the anoxic tank 4, and nitrate nitrogen is converted into nitrogen in an anoxic environment through denitrifying bacteria, so that the total nitrogen in the water body is removed. The anoxic tank 4 can be directly arranged in the existing aeration tank without being newly built. Meanwhile, the excess water (namely the sewage treated by the hydrolytic acidification tank 1) is added into the anoxic tank 4, so that the excess water can be used for supplementing a carbon source required by aerobic activated sludge and promoting the growth of the activated sludge. The exceeding water quantity is calculated according to the total COD of the inlet water in the first-stage aerobic tank 3, and can be adjusted according to the water quality condition of the final outlet water.
The retention time of the sewage after entering the secondary aerobic tank 5 is 6 hours, and aeration and oxygen flushing are carried out, so that pollutants in the part of the sewage, namely the degraded water, are degraded, and the quality of the aerobic effluent is further improved.
The secondary sedimentation tank 6 can be designed into a radial flow sedimentation type, sludge and water are separated, and part of generated sludge flows back to the front end of the primary aerobic tank 3 and is mixed with the sewage treated by the IC reactor 2. And conveying the residual sludge to a sludge treatment system through a sludge pump for treatment.
The sewage treated by the IC reactor 2 flows through a primary aerobic tank 3, an anoxic tank 4 and a secondary aerobic tank 5 in a self-flowing mode in sequence.
In addition, sludge discharge ports are arranged at the bottoms of the primary aerobic tank 3, the anoxic tank 4 and the secondary aerobic tank 5. When the sludge is deposited more, the sewage can be discharged through the sludge discharge port.
The specific conversion of nitrogen in the denitrification process comprises four processes of ammoniation, assimilation, nitrification and denitrification, and specifically comprises the following steps:
ammoniation effect
The nitrogen in the sewage exists in the form of organic nitrogen and ammonia nitrogen, and the content of protein, amino acid and urea in the organic nitrogen is the highest. The ammoniation is that the organic nitrogen in the sewage is decomposed and converted into ammoniacal nitrogen under the action of ammoniation bacteria. The microbial decomposition of organic nitrogen-containing compounds is the hydrolysis of macromolecules into small molecules by hydrolytic enzymes secreted in vitro. When proteins are decomposed, the proteins are hydrolyzed into amino acids by proteases secreted to the outside of cells, and the amino acids can enter microbial cells to be used as carbon sources and nitrogen sources of microorganisms. When it is decomposed in vivo or in vitro in a microorganism, ammonia is produced in a denitrogenation manner, and the reaction formula is as follows:
hydrolyzing the urea in the sewage into NH under the action of urea aminohydrolase, urease, secreted by microorganisms3And CO2The reaction formula is as follows:
assimilation action
In the biological treatment process, a part of nitrogen ammonia nitrogen or organic nitrogen in the sewage is assimilated into the components of the microbial cells.
Nitration
Under the aerobic environment, nitrifying bacteria further decompose and oxidize ammonia nitrogen in sewage, the reaction is realized through two processes, firstly, ammonia oxidizing bacteria convert ammonia nitrogen into nitrite nitrogen, and the reaction formula is as follows:
then, the nitrite nitrogen is further converted into nitrate nitrogen under the action of nitrite oxidizing bacteria, and the reaction formula is as follows:
the general reaction formula of the above two reactions is:
NH4 ++2O2→NO3 -+H2O+2H+-ΔF (ΔF＝351kJ)
the ammonia oxidizing bacteria and nitrite oxidizing bacteria are collectively called nitrifying bacteria. Nitrification of aerobic autotrophic bacteria of the genus Nitrification with inorganic compounds (e.g. CO)3 2-、HCO3 -、CO2) Is a carbon source and obtains energy from the oxidation reaction of ammonia nitrogen.
Chemical composition of nitrifying bacteria5H7NO2The equations, including ammonia nitrogen oxidation and new cell synthesis, are shown as:
NH4 ++1.83O2+1.98HCO3 -→0.02C5H7NO2+1.04H2O+0.98NO3 -+1.88H2CO3。
denitrification
Under anoxic conditions, denitrifying bacteria will nitrify NO produced during the nitrification phase2 --N and NO3 -And reducing N to nitrogen to remove nitrogen in the sewage. Denitrifying bacteria belong to heterotrophic facultative bacteria, and organic matters are used as a carbon source and an electron donor; NO in denitrification2 --N and NO3 -The conversion of-N is accomplished by the combined action of anabolic denitrification and dissimilatory denitrification by denitrifying bacteria, which make NO2 --N and NO3 -N is reduced to NH3Thereby synthesizing new cellular material; the dissimilatory denitrification being NO2 --N、NO3 --N is reduced to N2、N2O, NO, mainly N2And the dissimilatory denitrification can remove 70-75% of the total nitrogen.
In the invention, the return of the sludge is easy to cause sand deposition, the retention time of the sewage is reduced, and the equipment is easy to damage, and a circulating pump 7 and a sand discharge pump 8 are added. Specifically, according to the sewage flowing direction, a circulating pump 7 and a sand discharge pump 8 are sequentially arranged in the first-stage aerobic tank 3, namely, the circulating pump 7 is close to a circulating liquid inlet, and the sand discharge pump 8 is close to the anoxic tank 4.
The position of the circulating pump 7 can be provided with a stirrer, the inlet of the circulating pump 7 is communicated with the circulating liquid inlet, the outlet of the circulating pump 7 is connected with a plurality of branch pipes 71 in parallel, a plurality of holes are arranged on the branch pipes 71, and the hole direction is along the sewage flow direction and inclines upwards. The branch pipe 71 is located in the stirring area of the stirrer, and the sludge deposited in the stirring area is swept by the mixed liquid using the circulation pump 7, and is moved forward to the sand settling area by the stirrer and the sewage flow direction.
The inlet of the sand discharge pump 8 is communicated with a plurality of sand discharge branch pipes 81, the sand discharge branch pipes 81 are fixed in a sand setting area at the bottom of the first-stage aerobic tank 3, and openings are formed in the sand discharge branch pipes 81. And the sand discharge pump 8 pumps out the settled sand in the sand settling area for treatment. The sand discharge pump 8 can intermittently start sand discharge, the sampling port is arranged at the outlet, the starting period and time are set according to the sand amount of the sampling port, the sand discharge pump 8 adopts frequency conversion adjustment and realizes positive and negative rotation, and the sand discharge pump 8 can be used for back flushing dredging when the sand discharge branch pipe 81 is blocked.
It should be understood that the above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Claims (10)
1. A middle-placed aeration denitrification treatment method for papermaking sewage is characterized by comprising the following steps:
firstly, sewage enters an IC reactor (2) after being treated by a hydrolytic acidification tank (1), and is subjected to anaerobic treatment by the IC reactor (2);
secondly, the sewage treated by the IC reactor (2) enters a primary aerobic tank (3) for ammoniation and nitration;
thirdly, the sewage treated by the first-stage aerobic tank (3) enters an anoxic tank (4) for denitrification treatment;
fourthly, the sewage treated by the anoxic tank (4) enters a secondary aerobic tank (5) for ammoniation and nitration treatment;
and fifthly, enabling the sewage treated by the secondary aerobic tank (5) to enter a secondary sedimentation tank (6) for mud-water separation, separating and concentrating the activated sludge by the secondary sedimentation tank (6), wherein a part of the activated sludge flows back to the primary aerobic tank (3), mixing the part of the activated sludge with the sewage treated by the IC reactor (2) and then entering the primary aerobic tank (3), namely enabling a mixed solution of the sewage treated by the IC reactor (2) and the sludge returned by the secondary sedimentation tank (6) to enter the primary aerobic tank (3) through a mixed solution inlet, and enabling the rest sludge to enter a sludge treatment system for subsequent treatment.
2. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 1, characterized in that: in the first step, after the sewage is treated by the hydrolysis acidification tank (1), part of the sewage is conveyed to the primary aerobic tank (3) through the surpassing pipe.
3. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 2, characterized in that: in the first step, after the sewage is treated by the hydrolytic acidification tank (1), part of the sewage is conveyed to the anoxic tank (4) through the surpassing pipe.
4. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 1, characterized in that: the mixing volume ratio of the sewage treated by the IC reactor (2) to the activated sludge refluxed by the secondary sedimentation tank (6) is 1: 1.
5. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 1, characterized in that: the first-stage aerobic tank (3) and the second-stage aerobic tank (5) are aeration tanks.
6. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 1, characterized in that: the sewage treated by the IC reactor (2) flows through the primary aerobic tank (3), the anoxic tank (4) and the secondary aerobic tank (5) in sequence in a self-flowing mode.
7. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 1, characterized in that: and sludge discharge ports are arranged at the bottoms of the primary aerobic tank (3), the anoxic tank (4) and the secondary aerobic tank (5).
8. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to any one of claims 1 to 7, characterized in that: according to the sewage flowing direction, a circulating pump (7) and a sand discharge pump (8) are sequentially arranged in the first-stage aerobic tank (3), namely, the circulating pump (7) is close to a circulating liquid inlet, and the sand discharge pump (8) is close to the anoxic tank (4).
9. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 8, characterized in that: the inlet of the circulating pump (7) is communicated with the circulating liquid inlet, the outlet of the circulating pump is connected with a plurality of branch pipes (71) in parallel, a plurality of openings are arranged on the branch pipes (71), and the opening direction is inclined upwards along the sewage flow direction.
10. The centrally-installed aeration denitrification treatment method for papermaking wastewater according to claim 8, characterized in that: the inlet of the sand discharge pump (8) is communicated with a plurality of sand discharge branch pipes (81), the sand discharge branch pipes (81) are fixed at the bottom of the first-level aerobic pool (3), and openings are formed in the sand discharge branch pipes (81).
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