CN110143725A - Mixing sludge fermentation liquid is that carbon source continuous flow short-cut denitrification couples anaerobic ammonia oxidation process Treating Municipal Sewage device and method - Google Patents
Mixing sludge fermentation liquid is that carbon source continuous flow short-cut denitrification couples anaerobic ammonia oxidation process Treating Municipal Sewage device and method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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Abstract
It is that carbon source continuous flow short-cut denitrification couples anaerobic ammonia oxidation process Treating Municipal Sewage device and method the present invention provides a kind of mixing sludge fermentation liquid.The device of the invention mainly has municipal sewage water tank, continuous flow nitrogen rejection facility, mixing sludge fermentor, secondary settling tank device.Method are as follows: by way of adding anaerobic ammonia oxidizing bacteria filler, municipal sewage segmental influent, digestive juice and sludge reflux in anoxic zone and primary sedimentation tank and secondary settling tank mixing sludge fermentation liquid offer carbon source are provided to anoxic section, the removal of nitrogen is realized using short-cut denitrification Anammox as main technique.The present invention is with primary sedimentation tank and secondary settling tank mixing sludge fermentation liquid for outer carbon source, can the characteristics of relatively little of nitrogen, phosphorus and secondary settling tank sludge can produce a large amount of VFAs effectively be dissolved out in conjunction with primary sludge fermentation, conducive to the progress of short-cut denitrification, be conducive to the up to standard of water quality and carbon source can be saved, and achieve the purpose that sludge reduction, to reduce the purpose of operating cost.
Description
Technical field
It is that carbon source continuous flow short-cut denitrification couples anaerobic ammonia oxidation process the present invention relates to a kind of mixing sludge fermentation liquid
Treating Municipal Sewage device and method belong to the technical field of Sewage Biological Treatment.
Background technique
With the development of national economy, people's lives level is continuously improved, and water environment pollution problem is increasingly subject to people
Attention.Annual industrial production and domestic water can generate a large amount of nitrogenous, phosphorus waste water, these excessive pollutant emissions to water
It can cause serious water eutrophication problem in body, the study found that TN > 0.2mg/L in water body, TP > 0.02mg/L will draw
Eutrophication is sent out, Water-environment Ecological System is destroyed.Currently, China is increasingly stringent for nitrogen, phosphorus discharge standard, however traditional dirt
Method for treating water treatment effect is bad and energy consumption is high, and excess sludge production is big, and therefore, urgent need seeks a kind of denitrogenation dephosphorizing efficiency
The Novel sewage denitrogenation technology high, low energy consumption and runnability is stable.
Anaerobic ammonia oxidation process is under anoxic conditions, to be not necessarily to ammonia nitrogen in water and Nitrite transformation additional carbon, be
Nitrogen has many advantages, such as to save aeration quantity and organic carbon source, reduction sludge yield and nitrogen elimination capacity is high, with conventional processing technique
It compares, treatment effect is more preferable and saves operating cost.However, currently, the acquisition of stablizing of nitrite matrix is still anaerobism ammonia
One bottleneck problem of oxidation technology.Nitrate transformation can be nitrite by short-cut denitrification, to form nitrite
Accumulation, provide metastable nitrite matrix for anaerobic ammonia oxidation process, and accounting for of generating of anaerobic ammonia oxidation process into
The nitrate of water total nitrogen 11% can also couple anaerobic ammonia oxidation process by short-cut denitrification and further remove, it is de- to reach depth
The effect of nitrogen.
Summary of the invention
A kind of mixing sludge fermentation liquid is dirty for carbon source continuous flow short-cut denitrification coupling anaerobic ammonia oxidation process processing city
Water installations and method, it is characterised in that: equipment therefor includes municipal sewage water tank (1), continuous flow reactor (7), mixing sludge
Fermentor (17), secondary settling tank device (24)；Continuous flow reactor is by the first anoxic reacter (8), the first aerobic reactor (9-
1), the second aerobic reactor (9-2), the second anoxic reacter (10-1), third anoxic reacter (10-2), the 4th hypoxia response
Device (10-3) forms, and raw water enters the first anoxic reacter (8) and the second anoxic through intake pump (3) segmentation in municipal sewage water tank
In reactor (10-1)；The water part of continuous flow nitrogen rejection facility passes through effluent recycling pipeline (22) and effluent recycling peristaltic pump
(21) it is back to the second anoxic reacter (10-1), residue water outlet enters sedimentation basin and passes through outlet pipeline (26) discharge after precipitation
System；Clarifier sludge part is back to continuous flow nitrogen rejection facility through sludge reflux pump (29) and the control of sludge reflux control gate valve
The first anoxic reacter of head end (8), remaining sludge control discharge system through sludge spoil disposal gate valve；Mixing sludge fermentor (17)
In fermentation liquid metering pump (19) fermented sludge added by sludge add pipe (20) and add to the second anoxic reacter (10-
1) in；First aerobic reactor (9-1), the second aerobic reactor (9-2) aeration quantity by air pump (13), aeration valve (14) and
Gas flowmeter (15) control, and be aerated through aeration head (16)；First anoxic reacter (8), the second anoxic reacter (10-1),
Third anoxic reacter (10-2) and the 4th anoxic reacter (10-3) are provided with blender (12) and filler (11), and filler is adopted
The anaerobic ammonia oxidizing bacteria filler for being 20-30mm with diameter, packing ratio 25%-30%.
A kind of mixing sludge fermentation liquid is dirty for carbon source continuous flow short-cut denitrification coupling anaerobic ammonia oxidation process processing city
Water installations and method, which comprises the following steps:
It is inoculated with municipal sewage plant's secondary settling tank returned sludge, is added to continuous flow reactor (7), and cultivating keeps sludge dense
Degree reaches 2500-4000mg/L, then to the first anoxic reacter (8), the second anoxic reacter (10-1), third anoxic reacter
(10-2) and the 4th anoxic reacter (10-3) add anaerobic ammonia oxidizing bacteria filler (11), packing ratio 25%-30%.
Municipal sewage in municipal sewage water tank (1) enters continuous flow reactor (7) through intake pump (3) segmentation, wherein
60% waste water enters the first anoxic reacter (8) through water inlet shut-off valve (5) and segmental influent pump line (6), and 40% waste water enters
Second anoxic reacter (10-1).First anoxic reacter (8) is utilized in 60% raw water and is carried in carbon source denitrification returned sludge
Nitrate nitrogen and store the internal carbon source in effluent part；Enter aerobic reactor (9) afterwards and provides oxygen by air pump (13), it will be former
Mineralized nitrogen in water is nitrate nitrogen；Then the water outlet of aerobic reactor (9) and 40% raw water enter the second hypoxia response simultaneously
Device (10-1) carries out short-cut denitrification production using the carbon source that mixing sludge fermentor (17) fermented sludge adds pump (19) offer
Raw nitrite nitrogen provides substrate nitrite nitrogen for the anaerobic ammonia oxidizing bacteria on filler, and using ammonia nitrogen in 40% raw water and generates
Nitrite nitrogen carry out Anammox denitrogenation, generate nitrogen and nitrate nitrogen.
Continuous flow reactor (7) water part is back to the second anoxic reacter (10) through digestive juice reflux pump (21) and carries out
It is further processed, control digestive juice reflux ratio is 200%；Remaining part enters sedimentation basin (24) and carries out mud-water separation, out
Water overflow discharge system, precipitating sludge part are back to the first anoxic reacter (8) by sludge reflux pump (29) to guarantee instead
Answer the sludge concentration of device basicly stable, control return sludge ratio is 60%, and remaining partial sludge passes through sludge spoil disposal gate valve
(27) discharge system.
The mean hydraulic residence time HRT of segmental influent continuous flow reactor is controlled in 11-14h, passes through sludge spoil disposal lock
Valve (27) controls excess sludge discharge, controls the sludge age of floc sludge in reactor in 14-16d.
In the continuous flow short-cut denitrification anaerobic ammonia oxidation process that mixing sludge fermentation liquid is carbon source, the first hypoxia response
The function of device (8) mainly carries out denitrification denitrogenation, utilizes the nitre carried in the carbon source denitrification returned sludge in 60% raw water
State nitrogen simultaneously stores the internal carbon source in effluent part, and the function of aerobic reactor (9) mainly carries out complete nitrification, will be in raw water
Mineralized nitrogen is nitrate nitrogen, and sufficient matrix is provided for subsequent technique, and the function of reactor rear end anoxic reacter (10) is main
It is to carry out the denitrogenation of short-cut denitrification Anammox to raw water and further denitrogenation is carried out to the digestive juice of reflux, using aerobic anti-
The carbon source progress for answering nitrate nitrogen and mixing sludge fermentor (17) fermented sludge in device (9) water outlet to add pump (19) offer is short
Journey denitrification generates nitrite nitrogen, provides substrate nitrite nitrogen for the anaerobic ammonia oxidizing bacteria on filler, and using in 40% raw water
Ammonia nitrogen and the nitrite nitrogen of generation carry out Anammox denitrogenation, generate nitrogen and nitrate nitrogen.This method need to control segmental influent
Than the removal that, primary sedimentation tank and secondary settling tank mixing sludge fermentation liquid dosage, digestive juice and return sludge ratio more preferably to realize nitrogen,
By control C/N than hydraulic detention time (HRT) Lai Shixian short-cut denitrification Anammox with anoxic pond, nitrous is formed
Accumulation, provides reaction substrate for Anammox；By adding the anaerobic ammonia oxidizing bacteria filler that diameter is 25-30mm in anoxic pond
To enhance the withholding effect of anaerobic ammonia oxidizing bacteria, reach better denitrification effect；At effluent nitrate-nitrogen content and anoxic pond
Reason ability regulates and controls digestive juice reflux ratio to achieve the purpose that further denitrogenation.
A kind of mixing sludge fermentation liquid is dirty for carbon source continuous flow short-cut denitrification coupling anaerobic ammonia oxidation process processing city
Water installations and method have the advantage that 1) using sludge fermentation liquid as carbon source, can reduce cost, be conducive to sludge reduction；2)
Short-cut denitrification Anammox reaction process advantageously reduces sludge so sludge yield can be reduced for part autotrophic denitrification
Disposal costs, it is energy-saving；3) primary sludge can effectively be combined for outer carbon source with primary sedimentation tank and secondary settling tank mixing sludge fermentation liquid
Fermentation dissolves out the characteristics of relatively little of nitrogen, phosphorus and secondary settling tank sludge can produce a large amount of VFAs, conducive to the progress of short-cut denitrification, has
Conducive to the up to standard of water quality.
Detailed description of the invention
Fig. 1 is that a kind of mixing sludge fermentation liquid is carbon source continuous flow short-cut denitrification coupling anaerobic ammonia oxidation process processing city
City's sewage device.
Structural schematic diagram as shown in Figure 1,1 is municipal sewage water tank；2 be blow-down pipe；3 be intake pump；4 be total intake pump
Pipe；5 be water inlet shut-off valve；6 be segmental influent pump line；7 be continuous flow reactor；8 be the first anoxic reacter；9-1 is first
Aerobic reactor；9-2 is the second aerobic reactor；10-1 is the second anoxic reacter；10-2 is third anoxic reacter；10-3
For the 4th anoxic reacter；11 be anaerobic ammonia oxidizing bacteria filler；12 be blender；13 be air pump；14 be aeration valve；15 be gas
Flowmeter；16 be aeration head；17 be mixing sludge fermentor；18 be fermented sludge blender；19 add pump for fermented sludge；20
Pipe is added for fermented sludge；21 be digestive juice reflux pump；22 be digestive juice return pipe；23 be outlet pipe；24 be sedimentation basin；25 are
Overflow weir；26 be sedimentation basin water outlet；27 be sludge spoil disposal gate valve；28 be sludge reflux control gate valve；29 be sludge reflux pump；
30 be mud return line.
Specific embodiment:
In conjunction with Fig. 1, the embodiment that the present invention will be described in detail:
It is inoculated with municipal sewage plant's secondary settling tank returned sludge, is added to continuous flow reactor (7), and cultivating keeps sludge dense
Degree reaches 2500-4000mg/L, then to the first anoxic reacter (8), the second anoxic reacter (10-1), third anoxic reacter
(10-2) and the 4th anoxic reacter (10-3) add anaerobic ammonia oxidizing bacteria filler (11), packing ratio 25%-30%.
Municipal sewage in municipal sewage water tank (1) enters continuous flow reactor (7) through intake pump (3) segmentation, wherein
60% waste water enters the first anoxic reacter (8) through water inlet shut-off valve (5) and segmental influent pump line (6), and 40% waste water enters
Second anoxic reacter (10-1).First anoxic reacter (8) in the carbon source denitrification returned sludge in 60% raw water using taking
The nitrate nitrogen of band simultaneously stores the internal carbon source in effluent part；Enter aerobic reactor (9) afterwards and provides oxygen by air pump (13), it will
Mineralized nitrogen in raw water is nitrate nitrogen；Then it is anti-with 40% raw water to enter the second anoxic simultaneously for the water outlet of aerobic reactor (9)
Device (10-1) is answered, carries out short-cut denitrification using the carbon source that mixing sludge fermentor (17) fermented sludge adds pump (19) offer
Nitrite nitrogen is generated, provides substrate nitrite nitrogen for the anaerobic ammonia oxidizing bacteria on filler, and using ammonia nitrogen in 40% raw water and produce
Raw nitrite nitrogen carries out Anammox denitrogenation, generates nitrogen and nitrate nitrogen.
Continuous flow reactor (7) water part through digestive juice reflux pump (21) be back to the second anoxic reacter (10-1) into
Row is further processed, and control digestive juice reflux ratio is 200%；Remaining part enters sedimentation basin (24) and carries out mud-water separation,
It is discharged overflow discharge system, precipitating sludge part is back to the first anoxic reacter (8) by sludge reflux pump (29) to guarantee
The sludge concentration of reactor is basicly stable, and control return sludge ratio is 60%, and remaining partial sludge passes through sludge spoil disposal gate valve
(27) discharge system.
The mean hydraulic residence time HRT of segmental influent continuous flow reactor is controlled in 11-14h, passes through sludge spoil disposal lock
Valve (27) controls excess sludge discharge, controls the sludge age of floc sludge in reactor in 14-16d.
Concrete operations are as follows:
1) system starts: inoculation municipal sewage plant's secondary settling tank returned sludge is added to continuous flow reactor (7), and
Culture makes sludge concentration reach 2500-4000mg/L, then adds anaerobic ammonia oxidizing bacteria filler (11) to anoxic reacter (8,10),
Packing ratio is 25%-30%.
2) operation operation: the mean hydraulic residence time HRT control of segmental influent continuous flow reactor is in 11-14h, control
Return sludge ratio is 60%, and digestive juice reflux ratio is 200%；Aeration valve (14) and regulation gas flowmeter (15) are opened to control
Oxygenation capacity, control aerobic reactor (9) dissolved oxygen concentration are 2.0-3.0mg/L, and control anoxic reacter (8,10) dissolved oxygen is dense
Degree is 0mg/L；Segmentation enters the first anoxic reacter (8) and the water of the second anoxic reacter (10-1) accounts for the 60% of raw water respectively
With 40%；Excess sludge discharge is controlled by sludge spoil disposal gate valve (27), controls the sludge age of floc sludge in reactor in 14-
16d。
Claims (2)
1. mixing sludge fermentation liquid is that carbon source continuous flow short-cut denitrification couples anaerobic ammonia oxidation process Treating Municipal Sewage device,
It is characterized by comprising municipal sewage water tank (1), continuous flow reactor (7), mixing sludge fermentors (17), secondary settling tank device
(24)；
Continuous flow reactor by the first anoxic reacter (8), the first aerobic reactor (9-1), the second aerobic reactor (9-2),
Second anoxic reacter (10-1), third anoxic reacter (10-2), the 4th anoxic reacter (10-3) composition, municipal sewage water
Raw water enters in the first anoxic reacter (8) and the second anoxic reacter (10-1) through intake pump (3) segmentation in case；Continuous flow is de-
The water part of nitrogen device is back to the second anoxic reacter by effluent recycling pipeline (22) and effluent recycling peristaltic pump (21)
(10-1), residue water outlet enter sedimentation basin and pass through outlet pipeline (26) discharge system after precipitation；Clarifier sludge part is through dirt
Mud reflux pump (29) and the control of sludge reflux control gate valve are back to continuous flow nitrogen rejection facility the first anoxic reacter of head end (8),
Remaining sludge controls discharge system through sludge spoil disposal gate valve；Fermentation liquid in mixing sludge fermentor (17) is added by sludge
Metering pump (19) fermented sludge adds pipe (20) and adds into the second anoxic reacter (10-1)；First aerobic reactor (9-
1), the aeration quantity of the second aerobic reactor (9-2) is controlled by air pump (13), aeration valve (14) and gas flowmeter (15), and
It is aerated through aeration head (16)；First anoxic reacter (8), the second anoxic reacter (10-1), third anoxic reacter (10-2)
It is provided with blender (12) and filler (11) with the 4th anoxic reacter (10-3), it is detesting for 20-30mm that filler, which is all made of diameter,
Anaerobic ammonium oxidation bacterium filler, packing ratio 25%-30%.
2. using as described in claim 1 a kind of using mixing sludge fermentation liquid as carbon source continuous flow short-cut denitrification coupling anaerobism
The method of ammonia oxidation process Treating Municipal Sewage device, which is characterized in that comprise the steps of:
Step 1: inoculation municipal sewage plant's secondary settling tank returned sludge is added to continuous flow reactor (7), and culture makes sludge
Concentration reaches 2500-4000mg/L, then to the first anoxic reacter (8), the second anoxic reacter (10-1), third hypoxia response
Device (10-2) and the 4th anoxic reacter (10-3) add anaerobic ammonia oxidizing bacteria filler (11), packing ratio 25%-30%；
Step 2: the segmentation of municipal sewage in municipal sewage water tank (1) enters continuous flow reactor (7), wherein 60% waste water into
Enter the first anoxic reacter (8), 40% waste water enters the second anoxic reacter (10-1)；First anoxic reacter (8) utilizes
The nitrate nitrogen that carries in carbon source denitrification returned sludge in 60% raw water simultaneously stores the internal carbon source in effluent part；Enter afterwards
Oxygen reactor (9) provides oxygen by air pump (13), is nitrate nitrogen by the mineralized nitrogen in raw water；Then aerobic reactor (9)
Water outlet and 40% raw water enter the second anoxic reacter (10-1) simultaneously, utilize mixing sludge fermentor (17) fermented sludge
The carbon source for adding pump (19) offer carries out short-cut denitrification and generates nitrite nitrogen, the nitrite nitrogen of ammonia nitrogen and generation in 40% raw water
It carries out Anammox and generates nitrogen and nitrate nitrogen；
Step 3: continuous flow reactor (7) water part is back to the second anoxic reacter (10-1) through digestive juice reflux pump (21)
It is further processed, control digestive juice reflux ratio is 200%；Remaining part enters sedimentation basin (24) and carries out muddy water point
From water outlet overflow discharge system, precipitating sludge part is back to the first anoxic reacter (8) by sludge reflux pump (29), is controlled
Return sludge ratio processed is 60%, and remaining partial sludge passes through sludge spoil disposal gate valve (27) discharge system；
Step 4: the mean hydraulic residence time HRT of segmental influent continuous flow reactor is controlled in 11-14h, passes through sludge spoil disposal
Gate valve (27) controls excess sludge discharge, controls the sludge age of floc sludge in reactor in 14-16d.
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Cited By (14)
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| CN111333185A (en) * | 2020-02-29 | 2020-06-26 | 北京工业大学 | Urban sewage deep denitrification device and method based on pulse gas mixing type short-range denitrification/anaerobic ammonia oxidation granular sludge system |
| CN111908735A (en) * | 2020-08-28 | 2020-11-10 | 桂林理工大学 | AAO process transformation method for urban sewage treatment plant based on anaerobic ammonia oxidation |
| CN112093984A (en) * | 2020-09-16 | 2020-12-18 | 陕西新泓水艺环境科技有限公司 | Sewage treatment device with sludge fermentation function |
| CN112158952A (en) * | 2020-09-07 | 2021-01-01 | 北京工业大学 | Device and method for treating low-carbon-nitrogen-ratio wastewater through continuous flow AOA (argon oxygen decarburization) shortcut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification |
| CN112723540A (en) * | 2021-01-14 | 2021-04-30 | 上海大学 | Device and method for synchronously recovering phosphorus in sludge digestive fluid in sewage denitrification process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111333185A (en) * | 2020-02-29 | 2020-06-26 | 北京工业大学 | Urban sewage deep denitrification device and method based on pulse gas mixing type short-range denitrification/anaerobic ammonia oxidation granular sludge system |
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| CN111908735A (en) * | 2020-08-28 | 2020-11-10 | 桂林理工大学 | AAO process transformation method for urban sewage treatment plant based on anaerobic ammonia oxidation |
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| CN112811719A (en) * | 2020-12-29 | 2021-05-18 | 上海大学 | Autotrophic denitrification treatment system and method for urban sewage |
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| CN114620840A (en) * | 2022-01-09 | 2022-06-14 | 上海大学 | Method for deep denitrification of municipal sewage by anaerobic ammonia oxidation |
| WO2023168983A1 (en) * | 2022-03-08 | 2023-09-14 | 苏州科技大学 | Domestic sewage treatment device |
| CN114620833A (en) * | 2022-03-22 | 2022-06-14 | 北京工业大学 | Method for realizing nitrogen and phosphorus removal of low C/N domestic sewage by integrally coupling endogenous short-cut denitrification with anaerobic ammonia oxidation denitrification phosphorus removal |
| CN114735826A (en) * | 2022-05-12 | 2022-07-12 | 北控水务(中国)投资有限公司 | Automatic carbon supplementing system, automatic carbon supplementing method and AAO sewage treatment system |
| CN115072870A (en) * | 2022-06-23 | 2022-09-20 | 北控水务(中国)投资有限公司 | Treatment system and method for realizing efficient denitrification of sewage by combining heterotrophic culture and autotrophic culture |
| CN115286100A (en) * | 2022-08-30 | 2022-11-04 | 中冶华天工程技术有限公司 | Device and method for realizing deep denitrification of tail water of sewage plant by coupling short-cut denitrification anaerobic ammonia oxidation with anoxic MBBR (moving bed biofilm reactor) process |
| CN115448460A (en) * | 2022-10-25 | 2022-12-09 | 中建生态环境集团有限公司 | Device and method for realizing deep denitrification and synchronous sludge reduction of sewage in AOA continuous flow system |
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