CN112694172B - CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system and operation method - Google Patents
CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system and operation method Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 48
- 230000001651 autotrophic effect Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 25
- 230000008878 coupling Effects 0.000 title claims abstract description 20
- 238000010168 coupling process Methods 0.000 title claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 142
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000004062 sedimentation Methods 0.000 claims abstract description 30
- 239000010865 sewage Substances 0.000 claims abstract description 13
- 239000000725 suspension Substances 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000010992 reflux Methods 0.000 claims description 22
- 241000894006 Bacteria Species 0.000 claims description 21
- 238000011010 flushing procedure Methods 0.000 claims description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 16
- 238000011049 filling Methods 0.000 claims description 15
- 238000005273 aeration Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 239000000969 carrier Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 241001453382 Nitrosomonadales Species 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- 230000001546 nitrifying effect Effects 0.000 claims description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000002351 wastewater Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000009935 nitrosation Effects 0.000 description 2
- 238000007034 nitrosation reaction Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 102000008015 Hemeproteins Human genes 0.000 description 1
- 108010089792 Hemeproteins Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 239000006228 supernatant Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—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
- 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
- C02F3/30—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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- 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
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- 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
- C02F3/308—Biological phosphorus removal
-
- 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
Abstract
The invention discloses a CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system and an operation method thereof, and relates to the technical field of sewage treatment. The system comprises a reaction tank, a total water inlet pipeline and a total water outlet pipeline, wherein the reaction tank is sequentially divided into a first aerobic zone, a CANON reaction zone, a sedimentation zone, a second aerobic zone and an NDFO reaction zone from front to back; the water to be treated enters from the total water inlet pipeline, and is discharged through the total water outlet pipeline after sequentially passing through the first aerobic zone, the CANON reaction zone, the sedimentation zone, the second aerobic zone and the NDFO reaction zone; the device also comprises a return pipeline arranged between the NDFO reaction zone and the CANON reaction zone, and a return pipeline in the NDFO reaction zone of the NDFO reaction zone. According to the invention, CANON and NDFO technology are combined, and synchronous denitrification and dephosphorization of high ammonia nitrogen wastewater are realized through twice autotrophic denitrification.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system and an operation method.
Background
The CANON process is a novel low-cost biological denitrification process which is generally used for treating high ammonia nitrogen wastewater, and is commonly used in biological systems such as a Moving Bed Biofilm Reactor (MBBR) or granular sludge. The principle is that under the aeration condition, ammonia oxidizing bacteria on the outer layer of the biological film oxidize NH 4 + Oxidation of N to NO 2 - N, then anammox bacteria of the inner layer of the biofilm utilize NH 4 + -N and NO 2 - -denitrification process with N as substrate to produce nitrogen. The process can save 66.7% of oxygen and 100% of carbon source, and has the characteristics of high load, strong impact resistance, low cost, no need of adding carbon source and no need of adjusting pH, and is widely paid attention to. However, CANON technology still exists in practical applicationsIn some continuously solved problems, such as slow growth of anaerobic ammonia oxidizing bacteria, the effluent still contains high concentration ammonia nitrogen, and 11% of NO is produced while the ammonia nitrogen is removed 3 - -N, etc.
Iron is a trace element necessary for the growth of microorganisms, and its presence can promote the synthesis of anammoxosome (anammox) and some iron-requiring biological enzymes (HAO, octahedral heme proteins) which are the cellular structures of anammox bacteria, thereby accelerating the growth and propagation of anammox bacteria. In addition, iron can be used as an active metal for NO 2 - Or NO 3 - Is reduced by the reduction process.
Fe autotrophic denitrification can utilize Fe as an electron donor to treat NO 2 - Or NO 3 - Reduction to N 2 At the same time oxidize Fe to Fe 2 + The process does not need to add an organic carbon source and does not produce secondary pollution. However, at present, the Fe autotrophic denitrification also has NO in application 2 - Or NO 3 - Source of Fe (2) 2+ And (3) recycling and efficient utilization of Fe.
The related research reports of the prior art mainly include:
CN 103951140A discloses a method for efficiently treating nitrogen-containing wastewater based on zero-valent iron coupling anaerobic ammonia oxidation, which comprises the following steps: adding activated sludge and then Fe into an up-flow anaerobic reactor to carry out anaerobic ammoxidation reaction to generate NO 3 - Conversion to NH 4 + Make it react with NO again 2 - Anaerobic ammoxidation reaction is carried out. But the invention uses Fe to make NO 3 - Excessive conversion to NH 4 + On one hand, the operation cost is increased, on the other hand, the ammonia nitrogen in the effluent is easy to exceed the standard, and the generated Fe is not subjected to 2+ Or Fe (Fe) 3+ Make full use of.
CN 111943444A discloses a sewage treatment device and method for strengthening autotrophic denitrification and synchronous phosphorus recovery of municipal sewage, which is characterized in that: adding Fe into autotrophic nitrogen removal zone 2+ And/or Fe 3+ CANON and iron self-heating are carried outNutrient denitrification and ferric salt type anaerobic ammoxidation, fe produced simultaneously 3+ The chemical dephosphorization zone which flows back to the front end carries out dephosphorization, thus adding Fe 2+ And/or Fe 3+ Realizes synchronous denitrification and dephosphorization. However, fe added in the process 2+ Is easily oxidized into Fe under aerobic condition 3+ The method is unfavorable for the iron autotrophic denitrification, ferric salt type anaerobic ammonia oxidation is not easy to occur under the aerobic condition, and in addition, chemical dephosphorization at the front end leads to the too low concentration of water and phosphorus in an autotrophic denitrification area, thereby limiting the growth and propagation of related functional flora and further leading to the limited denitrification load of a system.
Therefore, when the denitrification or denitrification and dephosphorization process using Fe as a reactant is coupled with the anaerobic ammoxidation process, the problems of high-efficiency utilization of Fe and incapability of realizing high-efficiency denitrification and dephosphorization are faced, so that the application and development of related processes are restricted. According to the method, CANON is combined with an iron autotrophic denitrification process, so that high-efficiency removal of nitrogen and phosphorus is successfully realized, and the application potential of Fe is fully developed.
Disclosure of Invention
The invention aims to provide a CANON and iron autotrophic denitrification coupling synchronous nitrogen and phosphorus removal system which combines a CANON technology and an NDFO technology and realizes synchronous nitrogen and phosphorus removal of high ammonia nitrogen wastewater through twice autotrophic nitrogen removal.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system comprises a reaction tank, a total water inlet pipeline and a total water outlet pipeline, wherein the reaction tank is sequentially divided into a first aerobic zone, a CANON reaction zone, a sedimentation zone, a second aerobic zone and an NDFO reaction zone from front to back;
the total water inlet pipeline is connected to the tank body of the first aerobic zone, the total water outlet pipeline is connected to the tank body of the NDFO reaction zone, water to be treated enters from the total water inlet pipeline and is discharged through the total water outlet pipeline after sequentially passing through the first aerobic zone, the CANON reaction zone, the sedimentation zone, the second aerobic zone and the NDFO reaction zone;
a reflux pipeline is arranged between the NDFO reaction zone and the CANON reaction zone, and reflux liquid flows from the NDFO reaction zone to the CANON reaction zone; a reflux pipeline in the NDFO reaction zone is arranged in the NDFO reaction zone, and reflux liquid flows from the upper part of the NDFO reaction zone to the lower part of the NDFO reaction zone;
the lower part of the NDFO reaction zone is provided with a water distributor and a back flushing device, and the back flushing device comprises an air flushing pipe and a water flushing pipe;
and an iron-based fixed bed is assembled in the NDFO reaction zone, the iron-based fixed bed is distributed according to units, the filling rate of a zone body filter material can be changed by placing different unit numbers, and the filling rate of the filter material is 30% -60%.
As a preferable scheme of the invention, suspension carriers are added into the first aerobic zone, the CANON reaction zone and the second aerobic zone, and the density of the suspension carriers is 0.95-0.97g/cm 3 。
As another preferable scheme of the invention, the total water inlet pipeline is connected to the tank body at the upper part of the first aerobic zone, and the total water outlet pipeline is connected to the tank body at the upper part of the NDFO reaction zone; the first aerobic zone is communicated with the CANON reaction zone through a first interception screen arranged at the lower part of the water outlet end of the first aerobic zone, and the CANON reaction zone is communicated with the sedimentation zone through a second interception screen arranged at the upper part of the water outlet end of the CANON reaction zone; the sedimentation zone and the second aerobic zone are communicated through a third interception screen arranged at the upper part of the water outlet end of the sedimentation zone; the second aerobic zone and the NDFO reaction zone are mutually communicated through a fourth interception screen arranged at the lower part of the water outlet end of the second aerobic zone.
Further preferably, a diversion wall is arranged in the sedimentation zone, the upper end of the diversion wall is higher than the liquid level in the system, and the distance between the lower end and the bottom of the pool is 10% -30% of the depth of the pool.
Furthermore, the lower parts of the sedimentation areas are respectively provided with a mud discharging pipeline, and the mud discharging pipelines are provided with sedimentation area mud discharging valves.
Furthermore, aeration pipelines are arranged at the lower parts of the first aerobic zone, the CANON reaction zone and the second aerobic zone.
The invention also aims to provide an operation method of the CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system, which sequentially comprises the following steps:
a. the sewage to be treated firstly enters a first aerobic zone, and the organic matters in the inlet water are removed through heterotrophic bacteria attached and grown on a suspension carrier under the aeration condition;
b. the effluent of the first aerobic zone enters a CANON reaction zone, and nitrosate and anaerobic ammoxidation reactions are respectively carried out by nitrosate and anaerobic ammoxidation bacteria which are attached and grown on a suspension carrier, so as to realize CANON and finish part of NH 4 + -N removal, CANON reaction zone effluent NH 4 + N is less than 50mg/L, and compared with the inlet water, the ammonia oxidation rate of the outlet water of the CANON reaction zone is more than 50 percent; fe in reflux liquid from NDFO reaction zone 2+ Part of the Fe is absorbed and utilized by anaerobic ammonia oxidizing bacteria, and the other part of the Fe is oxidized into Fe 3+ With P0 in water 4 3- P to FeP0 4 A precipitate;
c. effluent from the CANON reaction zone enters a precipitation zone, feP0 4 The sediment is settled and discharged through a mud discharge pipeline of the settling zone;
d. the effluent of the precipitation zone enters a second aerobic zone, and the residual NH of the raw water is completed through nitrifying bacteria attached and grown on the suspension carrier 4 + -removal of N and generation of NO 3 - -N, second aerobic zone effluent NH 4 + -N＜1.5mg/L；
e. The effluent of the second aerobic zone enters an NDFO reaction zone, and the deep total nitrogen removal is completed through the iron autotrophic denitrifying bacteria attached and grown on the iron-based filter material, and Fe is generated 2+ In addition, the effluent of the NDFO reaction zone reaches the sewage discharge standard, and is discharged from a total water outlet pipeline at the upper part of the NDFO reaction zone.
Further, in the step a, the hydraulic retention time of the first aerobic zone is 1-4h.
Further, the sludge concentration of the first aerobic zone, the CANON reaction zone and the second aerobic zone is less than 500mg/L; the filling rate of the suspension carriers in the first aerobic zone, the CANON reaction zone and the second aerobic zone is 30-60%, the DO in the first aerobic zone and the DO in the second aerobic zone is 3-6mg/L, the DO in the CANON reaction zone is 1-2mg/L, and the DO in the NDFO reaction zone is less than 0.4mg/L.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) The method combines CANON autotrophic denitrification and Fe autotrophic denitrification processes to perform high-efficiency autotrophic denitrification, and does not need carbon source addition;
(2) The iron-based filter material has large application potential, can use scrap iron, sponge iron and some waste iron, is low in cost and easy to obtain, and is convenient for large-scale industrial application;
(3) And partial Fe generated by denitrification of Fe autotrophy is taken into consideration in denitrification and dephosphorization 2+ Reflux to CANON reaction zone, part is absorbed and utilized by anaerobic ammonia oxidation bacteria to promote activity of anaerobic ammonia oxidation bacteria, and part is oxidized into Fe 3+ With P0 in water 4 3- P to FeP0 4 A precipitate realizes synchronous denitrification and dephosphorization;
(4) The treatment load is high, the CANON and the iron autotrophic denitrification are respectively in the forms of MBBR and a filter tank, and the two process forms can realize the efficient enrichment of functional bacterial groups, thereby being beneficial to improving the denitrification load of the system.
(5) The first aerobic tank is added to reduce the adverse effect of inflow COD on the subsequent CANON and Fe autotrophic denitrification microorganisms, so that a good environment is created for the biochemical reaction tank, and the Fe autotrophic denitrification effluent can supplement a certain alkalinity for the CANON reaction tank to strengthen the denitrification effect.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system according to the present invention;
in the figure:
1. the device comprises a first aerobic zone, 2, a CANON reaction zone, 3, a sedimentation zone, 4, a second aerobic zone, 5, an NDFO reaction zone, 6, a suspension carrier, 7, a guide wall, 8, a sedimentation zone mud valve, 9, an iron-based fixed bed, 10, a backflushing air flushing device, 11, a backflushing water flushing device, 12, a water distribution plate, I1, a total water inlet pipeline, I2, a return pipeline, I3, a return pipeline in the NDFO reaction zone, I4, a total water outlet pipeline, C1, a first aerobic zone aeration pipeline, C2, a second aerobic zone aeration pipeline, C3, a third aerobic zone aeration pipeline, P1, a first return pump, P2 and a second return pump.
Detailed Description
The invention provides a CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system and an operation method thereof, and in order to make the advantages and the technical scheme of the invention clearer and more definite, the invention is further described below by combining specific embodiments.
The filling rate refers to the filling rate of the suspension carrier, namely the ratio of the volume of the suspension carrier to the cell capacity of a filling area, wherein the volume of the suspension carrier is the total volume of the suspension carrier in natural accumulation; such as 100m 3 Suspending carrier, filling to 400m 3 Pool volume, filling rate is 25%.
The iron-based fixed bed refers to a fixed bed, wherein reactants filled in the fixed bed mainly take elemental iron as raw materials;
the water distributor and the back flushing device can be realized by referring to the structure and the working method in the prior art.
As a main improvement point of the invention, the synchronous denitrification and dephosphorization of the high ammonia nitrogen wastewater is realized by combining CANON and NDFO technology and performing autotrophic denitrification twice. Specifically, as shown in fig. 1, the iron-based autotrophic nitrogen and phosphorus removal system based on MBBR of the invention comprises a reaction tank, a total water inlet pipeline I1 and a total water outlet pipeline I4, wherein the reaction tank is sequentially divided into a first aerobic zone 1, a CANON reaction zone 2, a sedimentation zone 3, a second aerobic zone 4 and an NDFO reaction zone 5 from front to back;
the device comprises a first aerobic zone, a second aerobic zone, a sedimentation zone, a first water inlet pipeline, a second water inlet pipeline, a first water outlet pipeline, a second water outlet pipeline, a third water inlet pipeline, a fourth water outlet pipeline and a third water outlet pipeline, wherein the first water inlet pipeline is connected to the tank body at the upper part of the first aerobic zone, the second water inlet pipeline is connected to the tank body at the upper part of the NDFO reaction zone, water to be treated enters from the first water inlet pipeline I1, and is discharged through the first aerobic zone, the CANON reaction zone, the sedimentation zone, the second aerobic zone and the NDFO reaction zone in sequence; the adjacent reaction areas are communicated, the first aerobic area is communicated with the CANON reaction area through a first interception screen arranged at the lower part of the water outlet end of the first aerobic area, and the CANON reaction area is communicated with the sedimentation area through a second interception screen arranged at the upper part of the water outlet end of the CANON reaction area; the sedimentation zone and the second aerobic zone are communicated through a third interception screen arranged at the upper part of the water outlet end of the sedimentation zone; the second aerobic zone and the NDFO reaction zone are mutually communicated through a fourth interception screen arranged at the lower part of the water outlet end of the second aerobic zone.
A reflux pipeline I2 is arranged between the NDFO reaction zone and the CANON reaction zone, reflux liquid flows from the NDFO reaction zone to the CANON reaction zone, and a first reflux pump P1 is arranged on the reflux pipeline I2; the NDFO reaction zone is provided with an internal reflux pipeline I3 of the NDFO reaction zone, the internal reflux pipeline I3 of the NDFO reaction zone is provided with a second reflux pump P2, and reflux liquid flows from the upper part of the NDFO reaction zone to the lower part of the NDFO reaction zone;
a water distributor and a back flushing device are arranged at the lower part of the NDFO reaction zone, for example, the water distributor consists of a water distribution plate 12, and the back flushing device comprises a back flushing air flushing device 10 and a back flushing water flushing device 11;
and an iron-based fixed bed 9 is assembled in the NDFO reaction zone, the iron-based fixed bed 9 is distributed according to units, the filling rate of the filter material of the zone body can be changed by placing different unit numbers, and the filling rate of the filter material is 30% -60%.
As a preferable scheme of the invention, suspension carriers 6 are added into the first aerobic zone, the CANON reaction zone and the second aerobic zone, and the density of the suspension carriers is 0.95-0.97g/cm 3 。
The sedimentation area is provided with a guide wall 7, the upper end of the guide wall is higher than the liquid level in the system, and the distance between the lower end and the bottom of the pool is 10% -30% of the depth of the pool.
Further, the lower parts of the sedimentation areas are respectively provided with a mud discharging pipeline, and the mud discharging pipelines are provided with sedimentation area mud discharging valves 8.
Further, the first aerobic zone aeration pipeline, the CANON reaction zone aeration pipeline and the second aerobic zone aeration pipeline are respectively arranged at the lower parts of the first aerobic zone, the CANON reaction zone and the second aerobic zone.
The operation method of the iron-based autotrophic nitrogen and phosphorus removal system based on the MBBR is described in detail below.
The method specifically comprises the following steps:
firstly, sewage to be treated firstly enters a first aerobic zone, and the organic matters in the inlet water are removed through heterotrophic bacteria attached and grown on a suspension carrier under the aeration condition, wherein the hydraulic retention time of the first aerobic zone is 1-4h;
secondly, the effluent of the first aerobic zone enters a CANON reaction zone, and nitrosations and anaerobic ammoxidation reactions are respectively carried out by nitrosations and anaerobic ammoxidation bacteria which are attached and grown on a suspension carrier, so as to realize CANON and finish part of NH 4 + -N removal, CANON reaction zone effluent NH 4 + N is less than 50mg/L, and compared with the inlet water, the ammonia oxidation rate of the outlet water of the CANON reaction zone is more than 50 percent; fe in reflux liquid from NDFO reaction zone 2+ Part of the Fe is absorbed and utilized by anaerobic ammonia oxidizing bacteria, and the other part of the Fe is oxidized into Fe 3+ With P0 in water 4 3- P to FeP0 4 A precipitate;
thirdly, the effluent from the CANON reaction zone enters a precipitation zone, feP0 4 The sediment is settled and discharged through a mud discharge pipeline of the settling zone;
fourthly, the effluent of the precipitation zone enters a second aerobic zone, and the residual NH of the raw water is completed through nitrifying bacteria attached to the suspended carrier for growth 4 + -removal of N and generation of NO 3 - -N, second aerobic zone effluent NH 4 + -N＜1.5mg/L；
Fifthly, the effluent of the second aerobic zone enters an NDFO reaction zone, deep total nitrogen removal is completed through iron autotrophic denitrifying bacteria attached and grown on the iron-based filter material, and Fe is generated 2+ In addition, the effluent of the NDFO reaction zone reaches the sewage discharge standard, and is discharged from a total water outlet pipeline at the upper part of the NDFO reaction zone.
Further, the sludge concentration of the first aerobic zone, the CANON reaction zone and the second aerobic zone is less than 500mg/L; the filling rate of the suspension carriers in the first aerobic zone, the CANON reaction zone and the second aerobic zone is 30-60%, the DO in the first aerobic zone and the DO in the second aerobic zone is 3-6mg/L, the DO in the CANON reaction zone is 1-2mg/L, and the DO in the NDFO reaction zone is less than 0.4mg/L.
The present invention will be described in detail with reference to specific examples.
Example 1:
adopting CANON and iron autotrophic denitrification coupling synchronous denitrification and dephosphorization system to treat anaerobic sludge digestion supernatant fluid of a certain sewage plant, and the water quantity is 120m 3 The average water temperature is 26 ℃, the average ammonia nitrogen concentration is 500mg/L, the average COD concentration is 650mg/L, the average BOD5 concentration is 310mg/L, the average TP is 15mg/L, and the average alkalinity (CaCO is used 3 Calculated) 4000mg/L. The depth of the system pool is 4.5m, and the density of the system pool is 0.95g/cm in the first aerobic zone, the CANON reaction zone and the second aerobic zone of the system 3 The filling rate of the suspension carriers is 30%, and the effective specific surface area of the suspension carriers added in the system is 800m 2 /m 3 . The water inlet end of the sedimentation zone is provided with a guide wall, the upper end of the guide wall is higher than the liquid level in the system, and the distance between the lower end and the bottom of the pool is 0.6m.
The operation method adopted by the system is as follows:
a. the sewage to be treated firstly enters a first aerobic zone, and the organic matters in the inlet water are removed through heterotrophic bacteria attached and grown on a suspension carrier under the aeration condition; the hydraulic retention time of the first aerobic zone is 1h, the sludge concentration is 285mg/L, and the DO is 3.2mg/L;
b. the effluent of the first aerobic zone enters a CANON reaction zone, and nitrosate and anaerobic ammoxidation reactions are respectively carried out by nitrosate and anaerobic ammoxidation bacteria which are attached and grown on a suspension carrier, so as to realize CANON and finish part of NH 4 + N removal with simultaneous Fe from the reflux of the NDFO reaction zone 2+ Part of the Fe is absorbed and utilized by anaerobic ammonia oxidizing bacteria, and the other part of the Fe is oxidized into Fe 3+ With P0 in water 4 3- P to FeP0 4 The sediment, the first return line, was 50% at reflux. Effluent NH of CANON reaction zone 4 + The average value of N is 45mg/L, and compared with the inlet water, the ammonia oxidation rate of the outlet water of the CANON reaction zone is up to 90 percent, and the average value of sludge concentration is 350mg/L;
c. effluent from the CANON reaction zone enters a precipitation zone, feP0 4 The sediment is settled and discharged through a mud discharge pipeline of the settling zone;
d. the effluent of the precipitation zone enters a second aerobic zone and is carried by suspensionNitrifying bacteria attached and grown on the body to complete the residual NH of raw water 4 + -removal of N and generation of NO 3 - N, the average value of the sludge concentration in the second aerobic zone is 294mg/L, DO3.8mg/L, and the effluent NH 4 + -N means 1.2mg/L;
e. the effluent of the second aerobic zone enters an NDFO reaction zone, and the deep total nitrogen removal is completed through the iron autotrophic denitrifying bacteria attached and grown on the iron-based filter material, and Fe is generated 2+ In addition, the effluent of the NDFO reaction zone reaches the sewage discharge standard, and is discharged from a total water outlet pipeline at the upper part of the NDFO reaction zone. The ammonia nitrogen and TN, COD, TP of the effluent are respectively 0.8, 7.4, 42.1 and 0.3mg/L.
The parts not described in the invention can be realized by referring to the prior art.
It should be noted that: any equivalent or obvious modifications made by those skilled in the art under the teachings of this specification shall fall within the scope of this invention.
Claims (9)
1. The utility model provides a synchronous denitrification dephosphorization system of CANON and iron autotrophic denitrification coupling, its includes reaction tank, total intake pipe way and total outlet pipe way, its characterized in that:
the reaction tank is sequentially divided into a first aerobic zone, a CANON reaction zone, a sedimentation zone, a second aerobic zone and an NDFO reaction zone from front to back;
the total water inlet pipeline is connected to the tank body of the first aerobic zone, the total water outlet pipeline is connected to the tank body of the NDFO reaction zone, water to be treated enters from the total water inlet pipeline and is discharged through the total water outlet pipeline after sequentially passing through the first aerobic zone, the CANON reaction zone, the sedimentation zone, the second aerobic zone and the NDFO reaction zone;
a reflux pipeline is arranged between the NDFO reaction zone and the CANON reaction zone, and reflux liquid flows from the NDFO reaction zone to the CANON reaction zone; a reflux pipeline in the NDFO reaction zone is arranged in the NDFO reaction zone, and reflux liquid flows from the upper part of the NDFO reaction zone to the lower part of the NDFO reaction zone;
the lower part of the NDFO reaction zone is provided with a water distributor and a back flushing device, and the back flushing device comprises an air flushing pipe and a water flushing pipe;
and an iron-based fixed bed is assembled in the NDFO reaction zone, the iron-based fixed bed is distributed according to units, the filling rate of the filter material of the zone body is changed by placing different unit numbers, and the filling rate of the filter material is 30% -60%.
2. The synchronous denitrification and dephosphorization system of coupling between CANON and iron autotrophic denitrification according to claim 1, wherein: suspension carriers are added into the first aerobic zone, the CANON reaction zone and the second aerobic zone, and the density of the suspension carriers is 0.95-0.97g/cm 3 。
3. The synchronous denitrification and dephosphorization system of coupling between CANON and iron autotrophic denitrification according to claim 1, wherein: the total water inlet pipeline is connected to the tank body at the upper part of the first aerobic zone, and the total water outlet pipeline is connected to the tank body at the upper part of the NDFO reaction zone; the first aerobic zone is communicated with the CANON reaction zone through a first interception screen arranged at the lower part of the water outlet end of the first aerobic zone, and the CANON reaction zone is communicated with the sedimentation zone through a second interception screen arranged at the upper part of the water outlet end of the CANON reaction zone; the sedimentation zone and the second aerobic zone are communicated through a third interception screen arranged at the upper part of the water outlet end of the sedimentation zone; the second aerobic zone and the NDFO reaction zone are communicated through a fourth interception screen arranged at the lower part of the water outlet end of the second aerobic zone.
4. The synchronous denitrification and dephosphorization system of coupling between CANON and iron autotrophic denitrification according to claim 1, wherein: the sedimentation area is provided with a guide wall, the upper end of the guide wall is higher than the liquid level in the system, and the distance between the lower end and the bottom of the pool is 10% -30% of the depth of the pool.
5. The synchronous denitrification and dephosphorization system of coupling between CANON and iron autotrophic denitrification according to claim 1, wherein: the lower parts of the sedimentation areas are respectively provided with a mud discharge pipeline, and the mud discharge pipelines are provided with sedimentation area mud discharge valves.
6. The synchronous denitrification and dephosphorization system of coupling between CANON and iron autotrophic denitrification according to claim 1, wherein: aeration pipelines are arranged at the lower parts of the first aerobic zone, the CANON reaction zone and the second aerobic zone.
7. The operation method of the synchronous denitrification and dephosphorization system of the coupling of the CANON and the iron autotrophic denitrification according to any one of claims 1 to 6, which is characterized by comprising the following steps in sequence:
a. the sewage to be treated firstly enters a first aerobic zone, and the organic matters in the inlet water are removed through heterotrophic bacteria attached and grown on a suspension carrier under the aeration condition;
b. the effluent of the first aerobic zone enters a CANON reaction zone, and nitrosate and anaerobic ammoxidation reactions are respectively carried out by nitrosate and anaerobic ammoxidation bacteria which are attached and grown on a suspension carrier, so as to realize CANON and finish part of NH 4 + -N removal, CANON reaction zone effluent NH 4 + N is less than 50mg/L, and compared with the inlet water, the ammonia oxidation rate of the outlet water of the CANON reaction zone is more than 50 percent; fe in reflux liquid from NDFO reaction zone 2+ Part of the Fe is absorbed and utilized by anaerobic ammonia oxidizing bacteria, and the other part of the Fe is oxidized into Fe 3+ With P0 in water 4 3- P to FeP0 4 A precipitate;
c. effluent from the CANON reaction zone enters a precipitation zone, feP0 4 The sediment is settled and discharged through a mud discharge pipeline of the settling zone;
d. the effluent of the precipitation zone enters a second aerobic zone, and the residual NH of the raw water is completed through nitrifying bacteria attached and grown on the suspension carrier 4 + -removal of N and generation of NO 3 - -N, second aerobic zone effluent NH 4 + -N＜1.5mg/L；
e. The effluent of the second aerobic zone enters an NDFO reaction zone, and the deep total nitrogen removal is completed through the iron autotrophic denitrifying bacteria attached and grown on the iron-based filter material, and Fe is generated 2+ In addition, the effluent of the NDFO reaction zone reaches the sewage drainageAnd discharging the standard by a total water outlet pipeline at the upper part of the NDFO reaction zone.
8. The operation method of the synchronous denitrification and dephosphorization system by coupling CANON and iron autotrophic denitrification according to claim 7, which is characterized in that: the hydraulic retention time of the first aerobic zone is 1-4h.
9. The operation method of the synchronous denitrification and dephosphorization system by coupling CANON and iron autotrophic denitrification according to claim 7, which is characterized in that: the sludge concentration of the first aerobic zone, the CANON reaction zone and the second aerobic zone is less than 500mg/L; the filling rate of the suspension carriers in the first aerobic zone, the CANON reaction zone and the second aerobic zone is 30-60%, the DO in the first aerobic zone and the DO in the second aerobic zone is 3-6mg/L, the DO in the CANON reaction zone is 1-2mg/L, and the DO in the NDFO reaction zone is less than 0.4mg/L.
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