CN115403143A - Low-carbon treatment system and process for realizing deep denitrification of high-ammonia-nitrogen wastewater - Google Patents

Low-carbon treatment system and process for realizing deep denitrification of high-ammonia-nitrogen wastewater Download PDF

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CN115403143A
CN115403143A CN202210947192.1A CN202210947192A CN115403143A CN 115403143 A CN115403143 A CN 115403143A CN 202210947192 A CN202210947192 A CN 202210947192A CN 115403143 A CN115403143 A CN 115403143A
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filter tank
aerobic zone
anoxic filter
anoxic
wastewater
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黄东辉
黄翀
刘超
申晨希
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Jiangsu Yulong Environment Protection Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/20Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

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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 low-carbon treatment system for realizing deep denitrification of high ammonia nitrogen wastewater, which comprises: the first anoxic filter tank is internally provided with a first stirring system; the first aerobic zone is connected with the first anoxic filter tank, and a first aeration system is arranged in the first aerobic zone; the second anoxic filter tank is connected with the first aerobic zone, and a second stirring system is arranged in the second anoxic filter tank; the second aerobic zone is connected with the second anoxic filter tank, and a second aeration system is arranged in the second aerobic zone; the third anoxic filter tank is connected with the second aerobic zone, and a third stirring system is arranged in the third anoxic filter tank; the third aerobic zone is connected with the third anoxic filter; the solid-liquid separation system is connected with the third aerobic zone and is connected with the first anoxic filter tank through a sludge backflow system. The invention alternately performs the functions of inner shortcut nitrification and anaerobic ammonia oxidation autotrophic denitrification, does not need to perform denitrification in a nitrifying liquid reflux mode, and saves the operation energy consumption of the system.

Description

Low-carbon treatment system and process for realizing deep denitrification of high-ammonia-nitrogen wastewater
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a low-carbon treatment system and a low-carbon treatment process for realizing deep denitrification of high-ammonia nitrogen wastewater.
Background
At present, anaerobic treatment and physical and chemical treatment are mainly used for domestic treatment of garbage leachate, kitchen garbage leachate, culture wastewater and the like, and the removal of total nitrogen in the high ammonia nitrogen wastewater is not paid enough attention. Some of the high-nitrogen pollutants in the wastewater are deeply treated by entering a municipal sewage plant, which undoubtedly increases the treatment burden of the sewage treatment plant and increases the operation cost of the sewage treatment plant; the other part directly enters the natural environment to cause adverse effect on the water environment;
the anaerobic ammonia oxidation autotrophic denitrification process gradually becomes a focus of attention of all countries in the world due to the advantages of deep denitrification, no need of an external carbon source in the denitrification process, low residual sludge yield, low N2O emission, low operation energy consumption and the like. High-ammonia nitrogen wastewater such as garbage leachate, kitchen waste leachate, aquaculture wastewater and the like can generate high-concentration FA in a sewage treatment system to form an inhibiting effect on NOB, can provide a stable nitrite substrate for anaerobic ammonia oxidation autotrophic denitrification, has inherent advantages for the operation of an anaerobic ammonia oxidation process, can solve the practical problems of high energy consumption and high cost of the high-ammonia nitrogen wastewater in the deep denitrification process to the greatest extent by applying the process, and provides organic technical support for the deep denitrification of the high-ammonia nitrogen wastewater; therefore, how to realize the anaerobic ammonia oxidation process more simply and stably through optimization and improvement on the technology and the process becomes a main direction of research.
Disclosure of Invention
The invention aims to provide a low-carbon treatment system and a low-carbon treatment process for realizing deep denitrification of high-ammonia-nitrogen wastewater, which solve the problems that the activity and the growth rate of the existing NOB are difficult to effectively inhibit and the short-cut nitrification is difficult to stably maintain, solve the problems of high energy consumption, high medicine consumption and high cost in the biochemical denitrification process of the high-ammonia-nitrogen wastewater, and reduce the yield of residual sludge.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a realize low carbon processing system of high ammonia nitrogen waste water degree of depth denitrogenation, includes:
the first anoxic filter tank is internally provided with a first stirring system;
the first aerobic zone is connected with the first anoxic filter tank, and a first aeration system is arranged in the first aerobic zone;
the second anoxic filter is connected with the first aerobic zone and is internally provided with a second stirring system;
the second aerobic zone is connected with the second anoxic filter tank, and a second aeration system is arranged in the second aerobic zone;
the third anoxic filter tank is connected with the second aerobic zone and is internally provided with a third stirring system;
the third aerobic zone is connected with the third anoxic filter tank, and a third aeration system is arranged in the third aerobic zone;
and the solid-liquid separation system is connected with the third aerobic zone and is connected with the first anoxic filter tank through a sludge return system.
A treatment process of a low-carbon treatment system for realizing deep denitrification of high ammonia nitrogen wastewater comprises the following steps:
step 1, pre-treating the garbage leachate, the kitchen garbage leachate and the aquaculture wastewater to remove suspended matters, partial organic matters and toxic and harmful heavy metal substances, and conveying the wastewater into a treatment system;
step 2, forming an NOB inhibition system by the combined inhibition of the first anoxic filter tank, the first aerobic zone, the second anoxic filter tank, the second aerobic zone, the third anoxic filter tank and the third aerobic zone through anoxic/aerobic alternation and FA (FA) generated by high ammonia nitrogen wastewater, and gradually eliminating the NOB from the system through inhibition of NOB activity;
step 3, after NOB is inhibited by the NOB inhibition system, ammonia oxidizing bacteria are used as main dominant bacteria in the system nitrification process, a short-range nitrification system is formed in the first aerobic zone and the second aerobic zone, and the first aerobic zone and the second aerobic zone carry out short-range nitrification to generate nitrite;
step 4, screening and enriching anaerobic ammonia oxidation bacteria by using anaerobic ammonia oxidation special fillers used by the first anoxic filter tank, the second anoxic filter tank and the third anoxic filter tank, forming an autotrophic denitrification system in the anoxic filter tank, and carrying out autotrophic denitrification on nitrite produced by the short-cut nitrification system and unreacted ammonia nitrogen in the autotrophic denitrification system to generate nitrogen and a small amount of nitrate nitrogen;
and 5, allowing the mixed liquor treated by the autotrophic nitrogen removal system to enter a solid-liquid separation system, allowing supernatant after solid-liquid separation to enter a subsequent treatment unit or to reach the standard for discharge, allowing bottom concentrated sludge to flow back to the first anoxic filter tank through a sludge return system to maintain the stability of the sludge concentration in the system, and removing part of nitrate nitrogen and nitrite nitrogen carried in the returned sludge in the area through denitrification and anaerobic ammoxidation.
Preferably, the wastewater in the step 1 is wastewater containing high ammonia nitrogen.
Preferably, the activated sludge is uniformly mixed in the system through the stirring action of the first stirring system, the second stirring system and the third stirring system, so that the activated sludge is prevented from accumulating at the bottom of the anoxic filter tank.
Preferably, the dissolved oxygen in the short-cut nitrification system is controlled to be in a low dissolved oxygen state through the action of the first aeration system, the second aeration system and the third aeration system.
Preferably, DO is less than or equal to 1.0mg/L, and the stable short-cut nitrification is further maintained through the low dissolved oxygen effect.
The low-carbon treatment system and the process for realizing the deep denitrification of the high-ammonia-nitrogen wastewater have the beneficial effects that:
1. the method can deeply remove the nitrogen-containing pollutants in the high ammonia nitrogen wastewater without adding an external carbon source, greatly reduce the energy consumption and the medicine consumption in the denitrification process, and realize carbon emission reduction;
2. the invention alternatively performs the functions of internal shortcut nitrification and anaerobic ammonia oxidation autotrophic denitrification without performing denitrification in a nitrifying liquid reflux mode, thereby saving the operation energy consumption of the system.
Drawings
FIG. 1 is a schematic diagram of a low carbon processing system according to the present invention.
In the figure: 1. the system comprises a first anoxic filter tank, 2, a first aerobic zone, 3, a second anoxic filter tank, 4, a second aerobic zone, 5, a third anoxic filter tank, 6, a third aerobic zone, 7, a solid-liquid separation system, 8, a first stirring system, 9, a first aeration system, 10, a second stirring system, 11, a second aeration system, 12, a third stirring system, 13, a third aeration system, 14 and a sludge backflow system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment, please refer to fig. 1, the present invention provides a technical solution: the utility model provides a realize low carbon processing system of high ammonia nitrogen waste water degree of depth denitrogenation, includes: the system comprises a first anoxic filter tank 1, a first aerobic zone 2, a second anoxic filter tank 3, a second aerobic zone 4, a third anoxic filter tank 5, a third aerobic zone 6, a solid-liquid separation system 7, a first stirring system 8, a first aeration system 9, a second stirring system 10, a second aeration system 11, a third stirring system 12, a third aeration system 13 and a sludge backflow system 14;
a first stirring system 8 is arranged in the first anoxic filter 1; the first aerobic zone 2 is connected with the first anoxic filter 1, and a first aeration system 9 is arranged in the first aerobic zone 2; the second anoxic filter 3 is connected with the first aerobic zone 2, and a second stirring system 10 is arranged in the second anoxic filter 3; the second aerobic zone 4 is connected with the second anoxic filter 3, and a second aeration system 11 is arranged in the second aerobic zone 4; the third anoxic filter 5 is connected with the second aerobic zone 4, and a third stirring system 12 is arranged in the third anoxic filter 5; the third aerobic zone 6 is connected with the third anoxic filter 5, and a third aeration system 13 is arranged in the third aerobic zone 6; the solid-liquid separation system 7 is connected with the third aerobic zone 6, and the solid-liquid separation system 7 is connected with the first anoxic filter tank 1 through a sludge reflux system 14.
A treatment process of a low-carbon treatment system for realizing deep denitrification of high ammonia nitrogen wastewater comprises the following steps:
step 1, pre-treating garbage leachate, kitchen garbage leachate, culture wastewater and the like to remove suspended matters, partial organic matters and toxic and harmful heavy metals, and conveying the wastewater into a treatment system;
the medium wastewater is wastewater containing high ammonia nitrogen;
step 2, forming an NOB inhibition system by a first anoxic filter 1, a first aerobic zone 2, a second anoxic filter 3, a second aerobic zone 4, a third anoxic filter 5 and a third aerobic zone 6 through anoxic/aerobic alternation and combined inhibition of FA (FA) generated by high ammonia nitrogen wastewater, and gradually eliminating the NOB from the system through inhibition of NOB activity;
step 3, after NOB is inhibited by the NOB inhibition system, ammonia Oxidizing Bacteria (AOB) are used as main dominant bacteria in the system nitrification process, a short-range nitrification system is formed in the first aerobic zone 2 and the second aerobic zone 4, and the first aerobic zone 2 and the second aerobic zone 4 carry out short-range nitrification to generate nitrite;
step 4, screening and enriching anaerobic ammonia oxidation bacteria by using special anaerobic ammonia oxidation fillers used by the first anoxic filter 1, the second anoxic filter 3 and the third anoxic filter 5, forming an autotrophic denitrification system in the anoxic filters, and carrying out autotrophic denitrification on nitrite produced by the short-cut nitrification system and unreacted ammonia nitrogen in the autotrophic denitrification system to generate nitrogen and a small amount of nitrate nitrogen;
step 5, the mixed liquor treated by the autotrophic nitrogen removal system enters a solid-liquid separation system 7, supernatant liquid after solid-liquid separation enters a subsequent treatment unit or reaches the standard to be discharged, bottom concentrated sludge flows back to the first anoxic filter 1 through a sludge return system 14 to maintain the stability of the sludge concentration in the system, and part of nitrate nitrogen and nitrite nitrogen carried in the returned sludge is removed in the area through denitrification and anaerobic ammoxidation;
and (3) carrying out mud-water separation by a solid-liquid separation system 7, introducing the supernatant into a subsequent treatment unit or directly discharging, introducing one part of deposited sludge into the first anoxic filter 1 through a sludge backflow system 14, and discharging the other part of the deposited sludge in the form of residual sludge for centralized treatment.
The stirring action of the first stirring system 8, the second stirring system 10 and the third stirring system 12 enables the activated sludge to be uniformly mixed in the system, so that the activated sludge is prevented from silting at the bottom of the anoxic filter tank;
the dissolved oxygen in the short-cut nitrification system is controlled to be in a low dissolved oxygen state through the action of the first aeration system 9, the second aeration system 11 and the third aeration system 13, DO is less than or equal to 1.0mg/L, and the stable short-cut nitrification is further maintained through the low dissolved oxygen action.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a realize low carbon processing system of high ammonia nitrogen waste water degree of depth denitrogenation which characterized in that includes:
the device comprises a first anoxic filter tank (1), wherein a first stirring system (8) is arranged in the first anoxic filter tank (1);
the first aerobic zone (2) is connected with the first anoxic filter tank (1), and a first aeration system (9) is arranged in the first aerobic zone (2);
the second anoxic filter tank (3) is connected with the first aerobic zone (2), and a second stirring system (10) is arranged in the second anoxic filter tank (3);
the second aerobic zone (4) is connected with the second anoxic filter tank (3), and a second aeration system (11) is arranged in the second aerobic zone (4);
the third anoxic filter tank (5) is connected with the second aerobic zone (4), and a third stirring system (12) is arranged in the third anoxic filter tank (5);
a third aerobic zone (6) connected with the third anoxic filter tank (5), wherein a third aeration system (13) is arranged in the third aerobic zone (6);
and the solid-liquid separation system (7) is connected with the third aerobic zone (6), and the solid-liquid separation system (7) is connected with the first anoxic filter tank (1) through a sludge return system (14).
2. The treatment process of the low-carbon treatment system for realizing the deep denitrification of the high-ammonia-nitrogen wastewater, which is characterized by comprising the following steps of:
step (1), pre-treating the garbage leachate, the kitchen garbage leachate and the aquaculture wastewater to remove suspended matters, partial organic matters and toxic and harmful heavy metal substances, and conveying the wastewater into a treatment system;
step (2), forming an NOB inhibition system by a first anoxic filter tank (1), a first aerobic zone (2), a second anoxic filter tank (3), a second aerobic zone (4), a third anoxic filter tank (5) and a third aerobic zone (6) through anoxic/aerobic alternation and combined inhibition of FA (FA) generated by high ammonia nitrogen wastewater, and gradually eliminating the NOB from the system through inhibition of NOB activity;
step (3) after NOB is inhibited by the NOB inhibition system, ammonia oxidizing bacteria are used as main dominant bacteria in the system nitrification process, a short-cut nitrification system is formed in the first aerobic zone (2) and the second aerobic zone (4), and the first aerobic zone (2) and the second aerobic zone (4) carry out short-cut nitrification to generate nitrite;
step (4), an autotrophic nitrogen removal system is formed in the anaerobic filter tank through the screening and enriching effects of anaerobic ammonia oxidation special fillers used by the first anoxic filter tank (1), the second anoxic filter tank (3) and the third anoxic filter tank (5), nitrite produced by the short-cut nitrification system and unreacted ammonia nitrogen are subjected to autotrophic nitrogen removal in the autotrophic nitrogen removal system, and nitrogen and a small amount of nitrate nitrogen are generated;
and (5) feeding the mixed liquor treated by the autotrophic nitrogen removal system into a solid-liquid separation system (7), feeding the supernatant after solid-liquid separation into a subsequent treatment unit or discharging the supernatant after reaching standards, refluxing the bottom concentrated sludge to the first anoxic filter (1) through a sludge reflux system (14) to maintain the stability of the sludge concentration in the system, and removing part of nitrate nitrogen and nitrite nitrogen carried in the refluxed sludge in the area through denitrification and anaerobic ammoxidation.
3. The treatment process of the low carbon treatment system for realizing the deep denitrification of the high ammonia nitrogen wastewater, according to the claim 2, is characterized in that the wastewater in the step (1) is the wastewater containing high ammonia nitrogen.
4. The treatment process of the low carbon treatment system for realizing the deep denitrification of the high ammonia nitrogen wastewater, according to the claim 2, is characterized in that the activated sludge is uniformly mixed in the system through the stirring action of the first stirring system (8), the second stirring system (10) and the third stirring system (12), so that the activated sludge is prevented from silting at the bottom of the anoxic filter tank.
5. The treatment process of the low carbon treatment system for realizing the deep denitrification of the high ammonia nitrogen wastewater, according to the claim 2, is characterized in that the dissolved oxygen in the short-cut nitrification system is controlled to be in a low dissolved oxygen state through the actions of the first aeration system (9), the second aeration system (11) and the third aeration system (13).
6. The treatment process of the low carbon treatment system for realizing the advanced nitrogen removal of the high ammonia nitrogen wastewater, according to claim 5, is characterized in that DO is less than or equal to 1.0mg/L, and the stable short-cut nitrification is further maintained through the low dissolved oxygen effect.
CN202210947192.1A 2022-08-08 2022-08-08 Low-carbon treatment system and process for realizing deep denitrification of high-ammonia-nitrogen wastewater Pending CN115403143A (en)

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Application publication date: 20221129