CN111908618A - High ammonia-nitrogen concentration effluent disposal system - Google Patents
High ammonia-nitrogen concentration effluent disposal system 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a high ammonia nitrogen wastewater treatment system, which comprises: the denitrification unit is configured to remove organic matters in the wastewater by denitrification and reduce the total nitrogen content of the wastewater to generate denitrification water; the shortcut nitrification unit is configured to convert part of ammonia nitrogen in the denitrification water production into nitrite nitrogen to generate shortcut nitrification water production; an anaerobic membrane bioreactor configured to filter a portion of the denitrification produced water in an anaerobic environment to remove impurities in the denitrification produced water to produce anaerobic membrane bio-produced water; the anaerobic ammonia oxidation unit is configured to denitrify ammonia nitrogen and nitrite nitrogen in the partial nitrification produced water and the anaerobic membrane biological produced water under the condition of no carbon source to generate nitrogen and generate anaerobic ammonia oxidation produced water; and the gas storage unit is configured to collect and store the nitrogen generated by the anaerobic ammonia oxidation unit. According to the high ammonia nitrogen wastewater treatment system provided by the invention, the anaerobic ammonia oxidation reaction is ensured to operate reliably and stably.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a high ammonia nitrogen wastewater treatment system.
Background
The high ammonia nitrogen wastewater generally refers to wastewater with ammonia nitrogen concentration of more than 500mg/L, and the water quality has the characteristics of high ammonia nitrogen concentration, complex carbon source components and the like. The main sources of the method are production discharge in industries such as steel, petrifaction, coking, glass manufacturing, pharmacy, fertilizer, feed, cultivation and meat processing, discharge in daily life, animal excretion, landfill leachate, agricultural production discharge and the like.
Ammonia nitrogen is used as a nutrient source of algae, and excessive ammonia nitrogen-containing wastewater discharged into a natural water body is bred with aquatic weeds, algae and the like, so that the phenomenon of water body eutrophication is easily induced, and the original ecological balance of the natural water body is damaged. About 4.6mg of dissolved oxygen is needed for oxidizing 1 mg of ammonia nitrogen, and the excessive consumption of the dissolved oxygen in the water body can cause black and smelly water body. In addition, free ammonia generated by ammonia nitrogen has biological toxicity and can poison fishes and aquatic organisms.
When the ammonia nitrogen content of part of industrial wastewater reaches 2000-3000mg/L, the conventional denitrification form (nitrification-denitrification process) is adopted to treat the high-concentration ammonia nitrogen wastewater, a large amount of carbon sources need to be supplemented, the oxygen needs to be supplemented due to very expensive power consumption, and the strains can meet the denitrification requirement due to the fact that a large pool volume and occupied area are built due to low denitrification load.
Therefore, there is a need to provide a new high ammonia nitrogen wastewater treatment system to solve the above problems.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The invention provides a high ammonia nitrogen wastewater treatment system, which comprises:
the denitrification unit is configured to remove organic matters in the wastewater by denitrification and reduce the total nitrogen content of the wastewater to generate denitrification water;
the shortcut nitrification unit is configured to convert part of ammonia nitrogen in the denitrification water production into nitrite nitrogen to generate shortcut nitrification water production;
an anaerobic membrane bioreactor configured to filter a portion of the denitrification produced water in an anaerobic environment to remove impurities in the denitrification produced water to produce anaerobic membrane bio-produced water;
the anaerobic ammonia oxidation unit is configured to denitrify ammonia nitrogen and nitrite nitrogen in the partial nitrification produced water and the anaerobic membrane biological produced water under the condition of no carbon source to generate nitrogen and generate anaerobic ammonia oxidation produced water;
and the gas storage unit is configured to collect and store the nitrogen generated by the anaerobic ammonia oxidation unit.
Further, the wastewater treatment system further comprises: the anaerobic unit is arranged at the front end of the denitrification unit and is configured to remove organic matters in the wastewater.
Further, the anaerobic membrane bioreactor comprises a nitrogen stripping device configured to create an anaerobic environment.
Further, the wastewater treatment system further comprises: and the gas pipeline is configured to introduce the nitrogen collected by the gas storage unit into the anaerobic membrane bioreactor so as to carry out nitrogen stripping.
Further, the wastewater treatment system further comprises: a return line configured to return the partial nitrification product water and the anammox product water to the denitrification unit to reduce total nitrogen and organic matter in the wastewater.
Furthermore, the proportion range of the short-cut nitrification produced water and the anaerobic membrane biological produced water after mixing is ensured to be 0.8-1.2 by controlling the water inflow of the short-cut nitrification unit, the nitrite generation concentration and the water inflow and the ammonia nitrogen concentration of the anaerobic membrane bioreactor.
Further, the short-cut nitrification unit also comprises an aeration device which is configured to provide oxygen and control the generation amount of the nitrite in the short-cut nitrification water production through oxygen aeration.
Further, the wastewater treatment system further comprises: and the advanced treatment unit is configured to carry out ultrafiltration, nanofiltration or reverse osmosis on the anaerobic ammonia oxidation produced water.
Further, the anammox reactor comprises a two-layer three-phase separator to collect the nitrogen.
Further, the anaerobic membrane bioreactor comprises a curtain membrane, a flat membrane or a hollow fiber membrane.
According to the high ammonia nitrogen wastewater treatment system provided by the invention, the wastewater enters the anaerobic ammonia oxidation unit after passing through the denitrification unit, the shortcut nitrification unit and the anaerobic membrane bioreactor, so that the anaerobic ammonia oxidation reaction is ensured to operate reliably and stably, nitrogen generated by the anaerobic ammonia oxidation reaction is collected and utilized, the energy consumption is saved, the cost is reduced, and the environment is protected.
Drawings
The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
In the drawings:
FIG. 1 is a schematic view of a high ammonia nitrogen wastewater treatment system according to an exemplary embodiment of the present invention.
Reference numerals
100 anaerobic reaction unit 200 denitrification unit
300 short-cut nitrification unit 301 short-cut nitrification reactor
302 aerobic membrane bioreactor 303 first return pipeline
400 anaerobic membrane bioreactor 500 anaerobic ammonia oxidation unit
501 second return pipeline 600 gas storage unit
700 deep processing unit
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
In order to thoroughly understand the present invention, a detailed description will be provided in the following description to illustrate the high ammonia nitrogen wastewater treatment system of the present invention. It is apparent that the practice of the invention is not limited to the specific details familiar to those skilled in the art of wastewater treatment. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
It should be 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 is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.
Aiming at the technical problems that in the prior art, a large amount of carbon sources need to be supplemented, expensive power consumption needs to be supplemented with oxygen, and a large pool volume and occupied area are built due to low denitrification load of strains when a nitrification and denitrification process is used for carrying out denitrification treatment on high-concentration ammonia nitrogen wastewater, the invention provides a high ammonia nitrogen wastewater treatment system, which comprises the following components in percentage by weight as shown in figure 1:
a denitrification unit 200 configured to remove organic matter in wastewater by denitrification and reduce the total nitrogen content of the wastewater to generate denitrification produced water;
the shortcut nitrification unit 300 is configured to convert part of ammonia nitrogen in the denitrification water production into nitrite nitrogen to generate shortcut nitrification water production;
an anaerobic membrane bioreactor 400 configured to filter a portion of the denitrification product water in an anaerobic environment to remove impurities from the denitrification product water to produce anaerobic membrane bio-product water;
an anammox unit 500 configured to denitrify ammonia nitrogen and nitrite nitrogen in the partial nitrification produced water and the anaerobic membrane biological produced water under a carbon source-free condition to generate nitrogen gas and generate anammox produced water;
illustratively, the wastewater treatment system provided by the invention further comprises an anaerobic unit 100, wherein the anaerobic unit 100 is arranged at the front end of the denitrification unit 200 and is configured to remove organic matters (measured as COD) in the wastewater.
Illustratively, the anaerobic unit 100 includes an anaerobic reactor. The current common anaerobic treatment processes are: UASB, EGSB, CSTR, IC, ABR, UBF, etc. Taking the Up-flow Anaerobic Sludge Bed reactor (UASB) as an example, the UASB consists of a Sludge reaction zone, a gas-liquid-solid three-phase separator and a gas chamber. A large amount of anaerobic sludge is reserved in a sludge reaction area at the bottom of the UASB, the high COD wastewater to be treated flows in from the bottom of the UASB to be mixed with the anaerobic sludge, and anaerobic bacteria in the sludge decompose organic matters in the high COD wastewater and convert the organic matters into methane. The marsh gas is continuously discharged in the form of micro bubbles and is continuously combined in the rising process to form larger bubbles, the sludge with thinner sludge concentration at the upper part of the sludge reaction zone, water and the marsh gas rise together to enter the three-phase separator due to the stirring of the marsh gas, and when the marsh gas touches the reflecting plate at the lower part of the three-phase separator, the marsh gas is bent to the periphery of the reflecting plate, then passes through the water layer to enter the gas chamber and is concentrated in the gas chamber. And the solid-liquid mixed liquid formed by the sludge and the water enters a settling zone of the three-phase separator through reflection, the sludge in the high-COD wastewater is subjected to flocculation and sedimentation and slides back to the sludge reaction zone along the inclined wall, and anaerobic produced water separated from the sludge enters subsequent treatment.
In one embodiment, the high organic matter, high ammonia nitrogen wastewater enters an anaerobic reactor to remove about 90% of the organic matter, producing anaerobic product water containing a small amount of organic matter.
In one embodiment, the wastewater that is only pretreated includes 50000mg/LCOD, 28000mg/L BOD, 2200mg/L NH4+-N, 2500mg/LTN, 12000mg/L SS. After being treated by the anaerobic unit 100, the generated anaerobic produced water comprises 5000mg/LCOD, 1000mg/L BOD and 2200mg/L NH4+-N，2500mg/LTN，10000mg/L SS。
Illustratively, the wastewater treatment system provided by the present invention includes a denitrification unit 200 configured to remove organic matter from wastewater and reduce the total nitrogen content of the wastewater using denitrification to produce denitrification produced water.
Illustratively, the denitrification unit 200 comprises a denitrification reactor. Denitrification, meaning the bacterial reduction of Nitrate (NO)3 -) Nitrogen (N) in (A) is passed through a series of intermediates (NO)2 -、NO、N2O) reduction to nitrogen (N)2) The biochemical process of (1). The bacteria involved in this process are collectively referred to as denitrifying bacteria. In the biochemical treatment process of sewage, denitrifying bacteria need to utilize carbon source to perform denitrification process, so that organic matter (calculated as COD) contained in sewage can be used as carbon source for denitrification, and the reaction equation is as follows:
2NO3 -+10e-+12H+→N2+6H2O,ΔG＝-333kJ/mol
in this embodiment, the denitrification unit 200 receives the refluxed anammox produced water and the refluxed short range nitrification produced water. Wherein, the anaerobic ammonia oxidation water comprises nitrate, the short-cut nitrification water comprises nitrite and nitrate, the nitrate and the nitrite can be used for further removing organic matters (measured by COD) in the wastewater so as to reduce degradable organic matters in the wastewater, and the nitrate can be removed through denitrification reaction, so that the total nitrogen content in the whole wastewater treatment system can be reduced.
Therefore, it should be noted that no carbon source needs to be added into the denitrification unit 200, and the main purpose of the denitrification unit 200 is not to reduce the total nitrogen amount, but to remove the organic matters remaining in the anaerobic produced water by using nitrate and nitrite, so as to reduce the organic matters subsequently entering the anaerobic ammonia oxidation unit 500, thereby reducing the operation cost of adding the carbon source.
In one embodiment, the denitrification water produced after treatment in the denitrification unit 200 comprises 1000mg/LCOD (80% removal), 100mg/L BOD (90% removal), and 1400mg/L NH4+N (removal rate 10%), 1500mg/LTN (removal rate 16%), 9000mg/L SS (removal rate 15%).
Illustratively, the wastewater treatment system provided by the invention comprises a short-cut nitrification unit 300, which is configured to convert part of ammonia nitrogen in the denitrification water into nitrite nitrogen to generate short-cut nitrification water.
Illustratively, the shortcut nitrification unit 300 includes a shortcut nitrification reactor 301 and an aerobic membrane bioreactor (aerobic MBR) 302. Short-cut nitrification, during the nitrification process, ammonia oxidizing bacteria, also called nitrosobacteria (AOB), are controlled to react with NH4 +Oxidation of-N to NO2 -N, and inhibition of nitrifying bacteria (NOB) from further NO2 --N oxygenConverted to NO3 -N, nitrite for the subsequent anammox unit 500.
Illustratively, the short-cut nitrification unit 300 further comprises an aeration device (not shown) configured to provide oxygen and control the short-cut nitrification water production and the short-cut nitrification water nitrite production by oxygen aeration such that the short-cut nitrification cumulative rate is > 90%.
In one embodiment, about 50% of the denitrification produced water enters the shortcut nitrification reactor 301, and the shortcut nitrification achieves enrichment for nitrosobacteria (AOB) by controlling aeration, dissolved oxygen, and controlling SRT, with the aim of providing an influent substrate for nitrite to the anammox unit 500.
The short-cut nitrification unit 300 reduces aeration by about 36% compared to the conventional nitrification process, while only 50% of the denitrification water is used for nitrosation, reducing oxygen consumption by 50%, and thus the short-cut nitrification unit 300 reduces aeration by 68% as a whole. In addition, 50% of denitrification water is adopted for nitrosation, 50% of short-cut nitrification tank volume can be saved, floor area is reduced, and cost is reduced for treatment of high ammonia nitrogen wastewater.
Illustratively, the aerobic membrane bioreactor 302 is used for filtering the effluent of the short-cut nitrification reactor 301 to generate short-cut nitrification produced water.
Illustratively, the configuration of the aerobic membrane bioreactor 302 includes, but is not limited to, curtain membrane, flat sheet membrane, and hollow fiber membrane.
Illustratively, the shortcut nitrification unit 300 further comprises a first return pipe 303 configured to return a portion of the shortcut nitrification produced water to the denitrification unit 200 to provide nitrite and nitrate to the denitrification unit 200.
Can effectively prevent COD to the suppression of anaerobic ammonia oxidation unit 500 through the backward flow of adjustment shortcut nitrification unit 300 to denitrification unit 200 for the wastewater treatment system has very strong anti COD impact load, can get rid of the total nitrogen volume of about 1/4 of COD equivalent through denitrification unit 200 again, has the advantage of anti COD impact load and high-efficient denitrogenation.
In one embodiment, the denitrification water yield after being processed by the shortcut nitrification unit 300 comprises 700mg/LCOD (removal rate 70%), 50mg/L BOD (removal rate 50%), and 50mg/L NH4+-N (95% removal) 1250mg/L NO2N (90% yield), 1500mg/LTN, 2000mg/L SS (78% removal).
Illustratively, the wastewater treatment system provided by the present invention includes an anaerobic membrane bioreactor 400 configured to filter a portion of the denitrification product water in an anaerobic environment to remove impurities from the denitrification product water to produce anaerobic membrane bio-product water.
Illustratively, the anaerobic Membrane bioreactor (AnMBR) 400 is a novel water treatment technology combining a Membrane separation technology with an anaerobic biological treatment unit, and the process of the anaerobic biological treatment technology is divided into two stages of anaerobic digestion and Membrane separation, wherein the anaerobic digestion stage is the same as that of the traditional anaerobic treatment process, and the Membrane separation stage adopts gas without oxygen to purge pollutants on the surface of the Membrane. The anaerobic membrane bioreactor 400 is constructed in the form of, but not limited to, a curtain membrane, a flat sheet membrane, and a hollow fiber membrane.
Illustratively, the anaerobic membrane bioreactor 400 includes a nitrogen stripping device configured to create an anaerobic environment. In one embodiment, the nitrogen used by the nitrogen stripping device is derived from nitrogen generated by the anaerobic ammonia oxidation unit 500, so that the treatment cost and the operation cost are saved, the emission of waste gas is reduced, and the environment is protected.
Illustratively, the anaerobic membrane bioreactor 400 includes a membrane filtration device configured to filter suspended matter and to filter undesired bacteria in water in an anaerobic environment, and may further reduce organic matter by 10% -20%. The nitrogen can be further used for flushing and shaking the membrane surface pollutants.
In one embodiment, about 50% of the denitrification product water enters the anaerobic membrane bioreactor 400, and a large amount of suspended matters, organic matters, denitrifying bacteria and other microorganisms are filtered by the membrane system, so as to provide water inflow guarantee for the anaerobic ammonia oxidizing bacteria of the anaerobic ammonia oxidation unit 500.
In one embodiment, after the denitrification produced water is treated by the anaerobic membrane bioreactor 400, the produced anaerobic membrane biological produced water comprises 800mg/LCOD (removal rate 80%), < 20mg/L BOD (removal rate > 80%), and 1350mg/L NH4+-N, 1500mg/LTN, 200mg/L SS (98% removal).
Illustratively, the ratio of ammonia nitrogen and nitrite after the short-cut nitrification produced water and the anaerobic membrane biological produced water are mixed is ensured by controlling the water inflow and nitrite production concentration of the short-cut nitrification unit 300 and the water inflow and ammonia nitrogen concentration of the anaerobic membrane bioreactor 400.
In one embodiment, one part of the denitrification produced water enters the shortcut nitrification unit 300, and the other part of the denitrification produced water enters the anaerobic membrane bioreactor 400, and in order to ensure the proportion of ammonia nitrogen and nitrite after the subsequent shortcut nitrification produced water and the anaerobic membrane biological produced water are mixed, the water inflow of the shortcut nitrification unit 300 and the water inflow of the anaerobic membrane bioreactor 400 can be adjusted.
Further, the proportion range of the ammonia nitrogen and the nitrite after the short-cut nitrification produced water and the anaerobic membrane produced water are mixed is 0.8-1.2.
Illustratively, the wastewater treatment system provided by the invention further comprises an online monitoring instrument (not shown) configured to control the proportion of ammonia nitrogen and nitrite after the short-cut nitrification produced water and the anaerobic membrane produced water are mixed, and the proportion of ammonia nitrogen and nitrite in the inlet water entering the subsequent anaerobic ammonia oxidation unit 500 after the short-cut nitrification produced water and the anaerobic membrane produced water are mixed is in the range of 0.8-1.2, so as to ensure the efficient operation of the anaerobic ammonia oxidation unit 500, and the wastewater treatment system has the advantages of controllable process, high automation degree and the like.
Illustratively, the wastewater treatment system provided by the present invention comprises an anammox unit 500 configured to denitrify ammonia nitrogen and nitrite nitrogen in the partial nitrification produced water and the anaerobic membrane biological produced water under carbon-source-free conditions to generate nitrogen gas and generate anammox produced water.
Illustratively, the anammox unit 500 comprises an anammox reactor. Anammox (Anammox) is a process in which ammonia is used as electron donor and nitrite is used as electron donor under anaerobic conditionSub NH4 ++1.32NO2 -+0.066HCO3 -+0.12H+→1.0N2↑+0.26NO3 -+0.066CH2O0.5N0.15+2.03H2O acceptor, a denitrification process for oxidizing ammonia into nitrogen without a carbon source. The reaction equation is as follows:
the anaerobic ammonia oxidation realizes the denitrification of ammonia nitrogen and nitrite nitrogen under the condition without an organic carbon source by means of anaerobic ammonia oxidation bacteria, but the conditions of the bacteria for water inflow are relatively harsh, so before the wastewater enters the anaerobic ammonia oxidation unit 500, organic matters are firstly removed through the anaerobic unit 100, the organic matters are further removed through the denitrification unit 200, the total nitrogen content of the wastewater is reduced, then nitrite is provided through the shortcut nitrification unit 300, the ammonia nitrogen is provided through the anaerobic membrane bioreactor 400, and good environmental conditions are created for the anaerobic ammonia oxidation reaction. Specifically, since the anammox bacteria has a certain requirement (<0.5mg/L) on the oxygen content of the influent water, the oxygen content of the influent water at the front end of the anammox must be strictly controlled, and therefore a nitrogen stripping device is arranged in the anaerobic membrane bioreactor 400 to create an anaerobic environment.
In one embodiment, denitrification produced water and partial nitrification produced water enter the anaerobic ammonia oxidation reactor, and high-efficiency denitrification is realized in the reactor. The ammonia nitrogen and nitrite react in the anaerobic ammonia oxidation reactor to generate nitrogen and a small amount (about 10 percent) of nitrate.
Illustratively, the anammox reactor comprises a three-phase separator to collect the nitrogen. Further, the wastewater treatment system provided by the present invention further comprises a gas storage unit 600 configured to collect and store the nitrogen generated by the anammox unit 500, wherein the gas storage unit 600 includes, but is not limited to, a gas pressure-stabilizing storage tank.
In one embodiment, the waste gas from the anammox unit 500 is passed through its own gas collector, such as a two-layer three-phase separator, into a top-mounted gas-water separator, which returns the water to the reactor, and the gas is passed into a nitrogen surge tank. Through setting up two-layer three-phase separator, strengthened gas collection ability, guarantee that gas does not get into anaerobic ammonia oxidation and produces water, realized efficient gas collection.
Illustratively, the wastewater treatment system provided by the invention further comprises a gas pipeline configured to introduce the nitrogen collected by the gas storage unit 600 into the anaerobic membrane bioreactor 400 for nitrogen stripping.
By collecting and storing the nitrogen generated by the anammox unit 500, the environmental pollution caused by the direct discharge of the waste gas is avoided (the waste gas contains a small amount of N besides the nitrogen)2O and H2S). And further supplies the collected nitrogen to the anaerobic membrane bioreactor 400 to form an anaerobic environment, thereby realizing the full utilization of the waste gas.
In one embodiment, the partial nitrification product water and the anaerobic membrane bio-product water are treated by the anammox unit 500 to produce anammox product water comprising < 50mg/LCOD, < 10mg/L BOD, < 15mg/L NH4+-N (98% removal), 150mg/LTN (90% removal), 200mg/L SS.
Illustratively, the anammox unit 500 further comprises a second return line 501 configured to return a portion of the anammox product water to the denitrification unit 200 to provide nitrate to the denitrification unit 200.
In one embodiment, a part of the anaerobic ammonia oxidation produced water flows back (the reflux ratio is 1-2) to the front-end denitrification unit 200 to be used as nitrate supplement for denitrification so as to meet the treatment requirement of total nitrogen, and the rest produced water is discharged after reaching the standard or enters the advanced treatment unit 700.
Illustratively, the advanced treatment unit 700 is configured to perform ultrafiltration, nanofiltration or reverse osmosis on the anammox produced water, and discharge the anammox produced water after reaching standards.
The high ammonia nitrogen wastewater treatment system provided by the invention can be quickly started to treat wastewater only by water inflow and strains, and has the characteristics of quick start and simple operation.
According to the high ammonia nitrogen wastewater treatment system provided by the invention, the wastewater enters the anaerobic ammonia oxidation unit after passing through the denitrification unit, the shortcut nitrification unit and the anaerobic membrane bioreactor, so that the anaerobic ammonia oxidation reaction is ensured to operate reliably and stably, nitrogen generated by the anaerobic ammonia oxidation reaction is collected and utilized, the energy consumption is saved, the cost is reduced, and the environment is protected.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a high ammonia-nitrogen concentration effluent disposal system which characterized in that includes:
the denitrification unit is configured to remove organic matters in the wastewater by denitrification and reduce the total nitrogen content of the wastewater to generate denitrification water;
the shortcut nitrification unit is configured to convert part of ammonia nitrogen in the denitrification water production into nitrite nitrogen to generate shortcut nitrification water production;
an anaerobic membrane bioreactor configured to filter a portion of the denitrification produced water in an anaerobic environment to remove impurities in the denitrification produced water to produce anaerobic membrane bio-produced water;
the anaerobic ammonia oxidation unit is configured to denitrify ammonia nitrogen and nitrite nitrogen in the partial nitrification produced water and the anaerobic membrane biological produced water under the condition of no carbon source to generate nitrogen and generate anaerobic ammonia oxidation produced water;
and the gas storage unit is configured to collect and store the nitrogen generated by the anaerobic ammonia oxidation unit.
2. The wastewater treatment system of claim 1, further comprising:
the anaerobic unit is arranged at the front end of the denitrification unit and is configured to remove organic matters in the wastewater.
3. The wastewater treatment system of claim 1, wherein the anaerobic membrane bioreactor comprises a nitrogen stripping device configured to create an anaerobic environment.
4. The wastewater treatment system of claim 3, further comprising:
and the gas pipeline is configured to introduce the nitrogen collected by the gas storage unit into the anaerobic membrane bioreactor so as to carry out nitrogen stripping.
5. The wastewater treatment system of claim 1, further comprising:
a return line configured to return the partial nitrification product water and the anammox product water to the denitrification unit to reduce total nitrogen and organic matter in the wastewater.
6. The wastewater treatment system of claim 1, wherein the proportion of ammonia nitrogen and nitrite after the short-cut nitrification product water and the anaerobic membrane biological product water are mixed is ensured to be in the range of 0.8-1.2 by controlling the water inflow and nitrite production concentration of the short-cut nitrification unit and the water inflow and ammonia nitrogen concentration of the anaerobic membrane bioreactor.
7. The wastewater treatment system of claim 1, wherein the short-cut nitrification unit further comprises an aeration device configured to provide oxygen and to control the amount of water nitrite produced by the short-cut nitrification by oxygen aeration.
8. The wastewater treatment system of claim 1, further comprising:
and the advanced treatment unit is configured to carry out ultrafiltration, nanofiltration or reverse osmosis on the anaerobic ammonia oxidation produced water.
9. The wastewater treatment system of claim 1, wherein the anammox reactor comprises a two-layer three-phase separator to collect the nitrogen.
10. The wastewater treatment system of claim 1, wherein the anaerobic membrane bioreactor comprises a curtain membrane, a flat sheet membrane, or a hollow fiber membrane.
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