CN112079440A - Device and process for biological treatment of wastewater through zoning, independence and high-efficiency combination - Google Patents
Device and process for biological treatment of wastewater through zoning, independence and high-efficiency combination Download PDFInfo
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- CN112079440A CN112079440A CN202010961125.6A CN202010961125A CN112079440A CN 112079440 A CN112079440 A CN 112079440A CN 202010961125 A CN202010961125 A CN 202010961125A CN 112079440 A CN112079440 A CN 112079440A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000008569 process Effects 0.000 title claims abstract description 42
- 238000013316 zoning Methods 0.000 title claims abstract description 13
- 230000009935 nitrosation Effects 0.000 claims abstract description 59
- 238000007034 nitrosation reaction Methods 0.000 claims abstract description 59
- 241000894006 Bacteria Species 0.000 claims abstract description 51
- 238000003763 carbonization Methods 0.000 claims abstract description 45
- 230000009471 action Effects 0.000 claims abstract description 16
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 7
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 5
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims description 37
- 239000010802 sludge Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 23
- 238000005273 aeration Methods 0.000 claims description 14
- 238000010992 reflux Methods 0.000 claims description 14
- 241000108664 Nitrobacteria Species 0.000 claims description 12
- 229910021529 ammonia Inorganic materials 0.000 claims description 11
- 230000000813 microbial effect Effects 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 238000006396 nitration reaction Methods 0.000 claims description 5
- 239000000969 carrier Substances 0.000 claims description 4
- 238000004065 wastewater treatment Methods 0.000 claims description 3
- 238000010000 carbonizing Methods 0.000 claims description 2
- 230000003100 immobilizing effect Effects 0.000 claims 2
- 150000002826 nitrites Chemical class 0.000 claims 2
- 244000005700 microbiome Species 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000005192 partition Methods 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 24
- VGPSUIRIPDYGFV-UHFFFAOYSA-N [N].O[N+]([O-])=O Chemical compound [N].O[N+]([O-])=O VGPSUIRIPDYGFV-UHFFFAOYSA-N 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- 230000035484 reaction time Effects 0.000 description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000010865 sewage Substances 0.000 description 7
- 235000015097 nutrients Nutrition 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000013589 supplement 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a device and a process for biological treatment of wastewater through zoning, independence and high efficiency combination, which provides a denitrification unit, a carbonization unit, a nitrosation unit and a nitrification unit, wherein wastewater to be denitrified enters the denitrification unit firstly to be denitrified under the action of denitrifying bacteria, the wastewater from the denitrification unit enters the carbonization unit to degrade organic matters in the wastewater into carbon dioxide under the action of carbonized heterotrophic bacteria, the wastewater from the carbonization unit enters the nitrosation unit to be nitrosated under the action of nitrite bacteria, one part of the wastewater from the nitrosation unit enters the nitrification unit to be nitrified under the action of nitrate bacteria, the other part of the wastewater from the nitrosation unit flows back to the denitrification unit, one part of the wastewater from the nitrification unit is discharged, and the other part of the wastewater from the nitrification unit flows back to the denitrification unit. The process has the characteristics of low energy consumption, microorganism population partition, low investment, high efficiency and the like.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a device and a process for biological treatment of wastewater through zoning, independence and high efficiency combination.
Background
At present, sewage treatment plants mainly adopt physical, biological and chemical methods to treat industrial wastewater and domestic sewage, separate solid pollutants in water and reduce organic pollutants and rich nutrients (mainly nitrogen and phosphorus compounds) in water so as to achieve the aim of reducing the pollution problem of sewage to the environment. Current wastewater plant treatment process energyMeets the requirements on CODcr and BOD5And the removal requirement of SS can meet the discharge standard. But has more problems in removing the rich nutrient substances in the wastewater.
The existing biological nitrogen removal treatment processes mainly comprise A/O, A/A/O, SBR, multi-stage A/O and other processes, although the processes can meet the requirement of conventional wastewater nitrogen removal, the defects of large water quality fluctuation range and poor process stability exist, and the processes consume more energy in the sewage treatment process and have high sewage treatment cost, so the processes are not beneficial to large-scale popularization and application. Therefore, a new technical solution needs to be developed to solve the above problems.
Disclosure of Invention
In order to solve the defects of the prior art, one of the purposes of the invention is to provide a partitioned, independent and efficient combined biological treatment device, and the device for denitrification treatment has the characteristics of low energy consumption, microorganism population partitioning, low investment, high efficiency and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a device for biological treatment of wastewater by zoning, independence and high efficiency combination, which comprises a denitrification unit, a carbonization unit, a nitrosation unit and a nitrification unit which are connected in sequence, wherein a wastewater inlet needing denitrification is arranged in the denitrification unit, denitrifying bacteria are fixed in the denitrifying unit, carbonized heterotrophic bacteria are fixed in the carbonizing unit, nitrite bacteria are fixed in the nitrosation unit, nitrate bacteria are fixed in the nitrification unit, aeration equipment is arranged in the carbonization unit, the nitrosation unit and the nitrification unit, the inlet of the aeration equipment is connected with a pipeline containing oxygen, the nitrosation unit and the nitrification unit are both provided with reflux outlets, the backflow outlet is connected with a backflow pipeline, backflow equipment is arranged on the backflow pipeline, the outlet of the backflow pipeline is connected with the backflow inlet of the denitrification unit, and the nitrification unit is provided with a nitrification unit wastewater outlet.
Conventional biological denitrification is to use a denitrification unit as the last unit in order to completely convert nitrogen in the rich nutrient into nitrogen. However, the conventional process has the problems that nitric acid nitrogen (including nitrate groups in organic matters) is firstly converted into ammonia nitrogen, and then the ammonia nitrogen is converted into nitrite nitrogen and nitric acid nitrogen through nitration, so that the energy consumption is high; meanwhile, since the denitrification unit is the last unit, part of the nitric acid nitrogen cannot be converted into nitrogen gas, and in order to completely convert the part of the nitric acid nitrogen, the process pipeline is more complicated, so that the denitrification efficiency is reduced. The denitrification unit is used as a first unit, nitric acid nitrogen is firstly converted into nitrogen, most of rich nutrients in the wastewater are consumed, then organic matters are removed through carbonization, and ammonia nitrogen in the wastewater is removed through nitrosation and nitrification, so that the energy consumption of the organic matter removal, nitrosation and nitrification processes is greatly reduced; meanwhile, the wastewater of the nitrosation unit and the nitrification unit flows back to the denitrification unit, so that an electron donor can be provided for denitrification, the denitrification efficiency is improved, the nitric acid nitrogen can be completely converted into nitrogen, the fluctuation range of water quality can be reduced, the process is simplified, and the denitrification efficiency is improved.
The invention also aims to provide a process for biological treatment of wastewater by zoning, independence and high efficiency combination, which comprises a denitrification unit, a carbonization unit, a nitrosation unit and a nitrification unit, wherein the wastewater to be denitrified enters the denitrification unit to be denitrified under the action of denitrifying bacteria, the wastewater from the denitrification unit enters the carbonization unit, degrading organic matters in the wastewater into carbon dioxide under the action of carbonized heterotrophic bacteria, feeding the wastewater from the carbonization unit into a nitrosation unit, nitrosation is carried out under the action of nitrite bacteria, part of the waste water from the nitrosation unit enters the nitrification unit, nitrifying under the action of nitrobacteria, refluxing another part of wastewater from the nitrosation unit to the denitrification unit, discharging one part of wastewater from the nitrification unit, and refluxing the other part of wastewater from the nitrification unit to the denitrification unit.
The invention also aims to provide the application of the device or the process in urban landscapes, medical treatment or catering.
The invention has the beneficial effects that:
1) different microorganism partitions of different units are realized, and each partition realizes different processing functions, so that the processing efficiency is higher.
2) Microorganism carriers are added into different subareas, so that microorganism curing with different functions in different subareas is realized, and the treatment efficiency in a single subarea is higher.
3) Realization of N-NH in denitrification process3→N-NO2 -→N2The nitrification and denitrification course of the process avoids the occurrence of N-NH3→N-NO2 -→N-NO3 -→N2The reaction route of (2) reduces the alkalinity adding amount and the aeration amount, and the treatment cost is lower.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the prior art has the defects of large water quality fluctuation range, high energy consumption, high treatment cost and the like of the traditional biological denitrification process, and in order to solve the technical problems, the invention provides a device and a process for biological treatment of wastewater by zoning, independence and high efficiency combination.
The invention provides a device for biological treatment of wastewater by zoning, independence and high efficiency combination, which comprises a denitrification unit, a carbonization unit, a nitrosation unit and a nitrification unit which are connected in sequence, wherein a wastewater inlet needing denitrification is arranged in the denitrification unit, denitrifying bacteria are fixed in the denitrification unit, carbonized heterotrophic bacteria are fixed in the carbonization unit, nitrite bacteria are fixed in the nitrosation unit, nitrate bacteria are fixed in the nitrification unit, aeration equipment is arranged in the carbonization unit, the nitrosation unit and the nitrification unit, an inlet of the aeration equipment is connected with a pipeline containing oxygen, return outlets are respectively arranged on the nitrosation unit and the nitrification unit, the return outlets are connected with return pipelines, return equipment is arranged on the return pipelines, an outlet of the return pipeline is connected with a return inlet of the denitrification unit, the nitrification unit is provided with a nitrification unit waste water outlet.
Conventional biological denitrification is to use a denitrification unit as the last unit in order to completely convert nitrogen in the rich nutrient into nitrogen. However, the conventional process has the problems that nitric acid nitrogen (including nitrate groups in organic matters) is firstly converted into ammonia nitrogen, and then the ammonia nitrogen is converted into nitrite nitrogen and nitric acid nitrogen through nitration, so that the energy consumption is high; meanwhile, since the denitrification unit is the last unit, part of the nitric acid nitrogen cannot be converted into nitrogen gas, and in order to completely convert the part of the nitric acid nitrogen, the process pipeline is more complicated, so that the denitrification efficiency is reduced. The denitrification unit is used as a first unit, nitric acid nitrogen is firstly converted into nitrogen, most of rich nutrients in the wastewater are consumed, then organic matters are removed through carbonization, and ammonia nitrogen in the wastewater is removed through nitrosation and nitrification, so that the energy consumption of the organic matter removal, nitrosation and nitrification processes is greatly reduced; meanwhile, the wastewater of the nitrosation unit and the nitrification unit flows back to the denitrification unit, so that an electron donor can be provided for denitrification, the denitrification efficiency is improved, the nitric acid nitrogen can be completely converted into nitrogen, the fluctuation range of water quality can be reduced, the process is simplified, and the denitrification efficiency is improved.
The nitrosation unit is provided with inorganic ammonia feeding equipment. Inorganic ammonia is provided to the nitrosation unit. The inorganic ammonia of the invention contains NH3Or NH4 +The inorganic compound of (1).
Some examples of the embodiment include a separation unit, a sludge-water separation device and a sludge backflow device are arranged in the separation unit, the wastewater outlet of the nitrification unit is connected with the inlet of the separation unit, the wastewater entering the separation unit is separated by the sludge-water separation device and then discharged, and the sludge backflow device conveys the separated sludge back to the denitrification unit. Further preferably, a sludge discharge device and a sludge collecting device are arranged in the separation unit.
In some examples of this embodiment, the denitrifying bacteria, the heterotrophic bacteria, and the nitrobacteria are immobilized by a microbial carrier. The microbial carrier is used for fixing the strains, so that the number of the strains can be increased.
In some examples of this embodiment, a DO (dissolved oxygen in water) online detector is disposed in each of the denitrification unit, the carbonization unit, the nitrosation unit and the nitrification unit. The dissolved oxygen in water in each unit is detected in real time, and the optimal living environment of the strains is ensured.
In another embodiment of the invention, a process for biological treatment of wastewater by zoning, independence and high efficiency combination is provided, a denitrification unit, a carbonization unit, a nitrosation unit and a nitrification unit are provided, wastewater to be denitrified enters the denitrification unit firstly to be denitrified under the action of denitrifying bacteria, the wastewater from the denitrification unit enters the carbonization unit, degrading organic matters in the wastewater into carbon dioxide under the action of carbonized heterotrophic bacteria, feeding the wastewater from the carbonization unit into a nitrosation unit, nitrosation is carried out under the action of nitrite bacteria, part of the waste water from the nitrosation unit enters the nitrification unit, nitrifying under the action of nitrobacteria, refluxing another part of wastewater from the nitrosation unit to the denitrification unit, discharging one part of wastewater from the nitrification unit, and refluxing the other part of wastewater from the nitrification unit to the denitrification unit.
The wastewater from the carbonization unit enters a nitrosation unit, and simultaneously inorganic ammonia is added into the nitrosation unit.
In some embodiments of this embodiment, a separation unit is provided, a sludge-water separation device and a sludge reflux device are provided in the separation unit, the wastewater outlet of the nitrification unit is connected to the inlet of the separation unit, the wastewater entering the separation unit is separated by the sludge-water separation device, and then the separated wastewater is discharged, and the sludge reflux device conveys the separated sludge back to the denitrification unit. Further preferably, a sludge discharge device and a sludge collecting device are arranged in the separation unit.
In some examples of this embodiment, the denitrifying bacteria, the heterotrophic bacteria, and the nitrobacteria are immobilized by a microbial carrier. The microbial carrier is used for fixing the strains, so that the number of the strains can be increased.
In some embodiments of this embodiment, the parameters within the denitrification unit are: DO is not more than 0.5mg/L, and pH is 6.8-7.5. Can provide the best reaction condition for denitrifying bacteria.
In some examples of this embodiment, the parameters within the carbonization unit are: DO is 2-2.5 mg/L, and pH is 7.8-8.5. The carbonization reaction in the carbonization unit is ensured to be over 90 percent.
In some embodiments of this embodiment, the parameters within the nitrosation unit are: DO is 0.5-1 mg/L, pH is 7.8-8.2, and free ammonia concentration is 0.5-0.7 mg/L.
In some examples of this embodiment, the reflux ratio within the nitrosation unit is 200-400%.
In some embodiments of this embodiment, the parameters within the nitrification unit are: DO is 2-2.5 mg/L.
In a third embodiment of the invention, there is provided the use of the above apparatus or process in urban landscaping, medical or catering.
The urban landscape comprises gardens, fountains and the like, and the water used by the garden watering and fountain is far lower than the standard of drinking water, so that the water treated by the device or the process can be used for gardens, fountains and the like in the urban landscape.
A large amount of eutrophic wastewater can be discharged in medical treatment or catering, so that the device or the process is suitable for treating the wastewater discharged in medical treatment or catering.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
The utility model provides a device of subregion, the individuation, high-efficient combination biological treatment waste water, including the denitrification unit that connects gradually, carbonization unit, nitrosation unit, nitrify the unit, the waste water import that needs the denitrogenation sets up at denitrification unit, denitrification unit internal fixation has denitrifying bacteria, carbonization unit internal fixation has carbonization heterotrophic bacteria, nitrosation unit is fixed with nitrite bacteria, nitrify the fixed nitrate bacteria of unit, carbonization unit, nitrosation unit, all be equipped with aeration equipment in the nitrification unit, aeration equipment's entry linkage contains the pipeline of oxygen, nitrosation unit and nitrification unit have all seted up the backward flow export, backward flow exit linkage backflow pipeline, be equipped with return flow equipment on the backflow pipeline, the backward flow import of backward flow pipeline's exit linkage denitrification unit, nitrify the unit and be equipped with nitrify unit waste water outlet.
The device also comprises a separation unit, wherein a mud-water separation device and a sludge backflow device are arranged in the separation unit, a wastewater outlet of the nitrification unit is connected with an inlet of the separation unit, wastewater entering the separation unit is separated by the mud-water separation device and then discharged, and the sludge backflow device conveys the separated sludge back to the denitrification unit. The separation unit is also internally provided with a sludge discharge device and a sludge collection device.
The denitrifying bacteria, the carbonized heterotrophic bacteria and the nitrobacteria all fix the strains through microbial carriers. The microbial carrier is used for fixing the strains, so that the number of the strains can be increased.
And a stirring device, a DO online detector and a pH online detector are also arranged in the denitrification unit. A DO online detector is also arranged in the carbonization unit. And a DO online detector, a pH online detector, an inorganic ammonia adding device and a pH adjusting device are also arranged in the nitrosation unit. A DO online detector is also arranged in the nitrification unit.
The process for treating the wastewater comprises the following steps:
1) the wastewater firstly enters a denitrification tank, a microorganism carrier is arranged in the tank for denitrifying bacteria solidification, the number of the denitrifying bacteria in the tank is more than twice of that of the denitrifying bacteria in the conventional process, the microorganisms in the anoxic tank are fully contacted and reacted with a substance to be degraded through stirring (air stirring, mechanical stirring and hydraulic stirring), DO in the tank is controlled to be below 0.5mg/L, pH is controlled to be 6.8-7.5, and optimal reaction conditions are provided for denitrifying bacteria.
2) And (2) the effluent in the step 1) enters a carbonization tank, a microorganism carrier is arranged in the tank to carry out carbonization heterotrophic bacteria solidification, the number of the carbonization heterotrophic bacteria in the tank is more than twice of that of the carbonization heterotrophic bacteria in the conventional process, and necessary oxygen is provided for microorganism metabolism through aeration and oxygen supply. In the carbonization tank, the organic substances are degraded into CO by carbonized heterotrophic bacteria2And CO2Along with the aeration overflow pond, the pH value in the carbonization unit can be increased to 7.8-8.5. The DO at the tail end in the carbonization unit is controlled to be more than 2mg/L by adjusting the aeration quantity, so that the carbonization reaction in the carbonization unit is ensured to be more than 90%.
3) And 2) enabling effluent to enter a nitrosation tank, controlling DO in a nitrosation unit to be 0.5-1 mg/L by adjusting aeration quantity, controlling the pH concentration in the nitrosation unit to be 7.8-8.2 by adding alkali, controlling the concentration of free ammonia in the nitrosation tank to be 0.5-0.7 mg/L by adding inorganic ammonia, and controlling the sludge age to be within 96 hours by discharging sludge to realize elimination of the nitric acid bacteria, so that an optimal reaction condition is created for the nitrous acid bacteria, and accumulation of the nitrous acid in the nitrosation unit is realized. The N-NO in the nitrosation pool is treated by a reflux device2 -And (4) refluxing to an anoxic unit (the reflux ratio is 200-400 percent) to provide an electron donor for denitrification of denitrifying bacteria.
4) And 3) introducing the effluent into a nitrification tank, wherein a microbial carrier is arranged in the nitrification tank for carrying out nitrobacteria solidification, so that the quantity of the nitrobacteria in the nitrification tank is more than twice of that of the nitrobacteria in the conventional process, and controlling DO in the nitrification unit to be more than 2mg/L by adjusting the aeration amount, thereby providing the best reaction condition for the nitrobacteria. And degrading the residual organic matters and ammonia nitrogen in the wastewater by using heterotrophic bacteria and nitrobacteria. The reflux device is used for mixing N-NO in the nitrification tank3 -And provides an electron donor for denitrifying the denitrifying bacteria.
5) And 4) enabling the effluent in the step 4) to enter a separation tank, arranging a mud-water separation device in the separation tank, discharging the treated water outside or entering the next unit, discharging the residual sludge into a sludge treatment device for dehydration treatment, and refluxing the returned sludge to a denitrification tank to supplement microorganisms for the whole set of reactor.
The above apparatus and process are applied as follows:
example 1
The treatment capacity of a sewage treatment plant in Hebei Shizhuangzhuang county is 1m3H is used as the reference value. The reaction time of the denitrification unit is controlled to be 3h, the reaction time of the carbonization unit is controlled to be 2.5h, the reaction time of the nitrosation unit is controlled to be 3.5h, the reaction time of the nitrification unit is controlled to be 2h, and the specific data are shown in a table 1:
TABLE 1
Unit: mg/L, pH dimensionless
| Item | CODGr | N-NH3 | BOD5 | pH | DO | N-NO2 | N-NO3 | Free ammonia |
| Raw water | 355 | 82.5 | 204 | 7.1 | -- | -- | 0.15 | -- |
| Denitrification unit | 95 | 26 | 44 | 7.2 | 0.1 | -- | -- | -- |
| Carbonization unit | 65 | 22.5 | 28 | 7.9 | 2.55 | 3.8 | 1.5 | 0.03 |
| Nitrosation unit | 50 | 2.2 | 10 | 8.1 | 0.6 | 21.2 | 3.7 | 0.5 |
| Nitration unit | 42 | 1 | 8 | 7.5 | 2.8 | 1.1 | 6.5 | Not detected out |
Example 2
The treatment capacity of a sewage treatment plant in the Hebei Gaoyi county is 1m3H is used as the reference value. The reaction time of the denitrification unit is controlled to be 3h, the reaction time of the carbonization unit is controlled to be 2.5h, the reaction time of the nitrosation unit is controlled to be 3.5h, the reaction time of the nitrification unit is controlled to be 2h, and the specific data are shown in a table 2:
TABLE 2
Unit: mg/L, pH dimensionless
| Item | CODGr | N-NH3 | BOD5 | pH | DO | N-NO2 | N-NO3 | Free ammonia |
| Raw water | 402 | 72 | 200 | 6.8 | -- | -- | 0.22 | -- |
| Denitrification unit | 102 | 24 | 53 | 7.2 | 0.1 | -- | -- | -- |
| Carbonization unit | 68 | 20.5 | 22 | 7.7 | 3.0 | 2.9 | 1.1 | Not detected out |
| Nitrosation unit | 55 | 2.7 | 12 | 8.0 | 0.5 | 20.8 | 2.2 | 0.6 |
| Nitration unit | 45 | 1.1 | 10 | 7.6 | 3.2 | 2.2 | 5.5 | Not detected out |
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A device for biological treatment of wastewater with zoning, independence and high efficiency combination is characterized by comprising a denitrification unit, a carbonization unit, a nitrosation unit and a nitrification unit which are connected in sequence, wherein a wastewater inlet needing denitrification is arranged in the denitrification unit, denitrifying bacteria are fixed in the denitrifying unit, carbonized heterotrophic bacteria are fixed in the carbonizing unit, nitrite bacteria are fixed in the nitrosation unit, nitrate bacteria are fixed in the nitrification unit, aeration equipment is arranged in the carbonization unit, the nitrosation unit and the nitrification unit, the inlet of the aeration equipment is connected with a pipeline containing oxygen, the nitrosation unit and the nitrification unit are both provided with reflux outlets, the backflow outlet is connected with a backflow pipeline, backflow equipment is arranged on the backflow pipeline, the outlet of the backflow pipeline is connected with the backflow inlet of the denitrification unit, and the nitrification unit is provided with a nitrification unit wastewater outlet.
2. The device as claimed in claim 1, which comprises a separation unit, wherein a sludge-water separation device and a sludge backflow device are arranged in the separation unit, a wastewater outlet of the nitrification unit is connected with an inlet of the separation unit, wastewater entering the separation unit is separated by the sludge-water separation device and then discharged, and the sludge backflow device conveys the separated sludge back to the denitrification unit; further preferably, a sludge discharge device and a sludge collecting device are arranged in the separation unit.
3. The apparatus as claimed in claim 1, wherein the denitrifying bacteria, the heterotrophic bacteria and the nitrobacteria are used for immobilizing the strains through microbial carriers.
4. A process for biological treatment of waste water by means of zoning, independence and high efficiency combination is characterized in that a denitrification unit, a carbonization unit, a nitrosation unit and a nitrification unit are provided, waste water needing denitrification enters the denitrification unit to be denitrified under the action of denitrifying bacteria, waste water from the denitrification unit enters the carbonization unit to degrade organic matters in the waste water into carbon dioxide under the action of carbonized heterotrophic bacteria, waste water from the carbonization unit enters the nitrosation unit to be nitrosated under the action of nitrites, part of waste water from the nitrosation unit enters the nitrification unit to be nitrified under the action of nitrites, the other part of waste water from the nitrosation unit flows back to the denitrification unit, the other part of waste water from the nitrification unit is discharged, and the other part of waste water from the nitrification unit flows back to the denitrification unit.
5. A process according to claim 4, wherein a separation unit is provided, a sludge-water separation device and a sludge recirculation device are provided in the separation unit, the wastewater outlet of the nitrification unit is connected to the inlet of the separation unit, the wastewater entering the separation unit is separated by the sludge-water separation device and the separated wastewater is discharged, and the sludge recirculation device conveys the separated sludge back to the denitrification unit.
6. The process as claimed in claim 4, wherein the denitrifying bacteria, the heterotrophic bacteria and the nitrobacteria are used for immobilizing the strains through microbial carriers.
7. The process as claimed in claim 4, wherein the parameters in the denitrification unit are: DO is not more than 0.5mg/L, and pH is 6.8-7.5.
8. The process according to claim 4, characterized in that the parameters in the carbonization unit are: DO is 2-2.5 mg/L, and pH is 7.8-8.5.
9. A process according to claim 4, characterized in that the parameters within the nitrosation unit are: DO is 0.5-1 mg/L, pH is 7.8-8.2, and the concentration of free ammonia is 0.5-0.7 mg/L;
or, the parameters in the nitration unit are: DO is 2-2.5 mg/L.
10. An application of the device for biological wastewater treatment by zoning, independence and high efficiency combination as claimed in any one of claims 1 to 3 or the process for biological wastewater treatment by zoning, independence and high efficiency combination as claimed in any one of claims 4 to 9 in urban landscapes, medical treatment or catering.
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