CN220766702U - High nitrogen-containing organic wastewater's processing system - Google Patents
High nitrogen-containing organic wastewater's processing system Download PDFInfo
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- CN220766702U CN220766702U CN202322450018.9U CN202322450018U CN220766702U CN 220766702 U CN220766702 U CN 220766702U CN 202322450018 U CN202322450018 U CN 202322450018U CN 220766702 U CN220766702 U CN 220766702U
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Abstract
The utility model relates to a treatment system of high nitrogen-containing organic wastewater, which comprises an anaerobic reactor and a partial nitrosation-anaerobic ammoxidation reactor which are sequentially arranged, wherein the anaerobic reactor is at least provided with a plurality of compartments and settling chambers which are sequentially arranged in the water flow direction, and the treatment system also comprises a first aeration mechanism for aerating into the partial nitrosation-anaerobic ammoxidation reactor and a return pipeline connected between the water outlet end of the partial nitrosation-anaerobic ammoxidation reactor and the anaerobic reactor; the treatment system further comprises a second aeration mechanism for aerating into the precipitation chamber, or the treatment system further comprises an aeration tank connected between the anaerobic reactor and the partial nitrosation-anaerobic ammoxidation reactor and a second aeration mechanism for aerating into the aeration tank. The utility model is mainly used for treating high nitrogen-containing organic wastewater by combining the anaerobic reactor and the partial nitrosation-anaerobic ammoxidation reactor, and has the advantages of less equipment investment, low energy consumption and low running cost.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a treatment system for high-nitrogen-content organic wastewater.
Background
N, N-Dimethylacetamide (DMAC) and N, N-Dimethylformamide (DMF) wastewater belong to typical high-concentration nitrogen-containing organic wastewater. DMAC and DMF are aprotic high-polarity solvents, can be mixed with organic solvents such as water, alcohol, ether, ester, benzene, trichloromethane, aromatic compounds and the like at will, and can activate compound molecules, so that the organic solvents are widely applied to fields such as pesticides, medicines, synthetic fibers, industrial coatings, fine chemical thin films, paint removers and the like, and are indispensable organic solvents in the fields of acrylic fiber production and chemical fiber industry. In recent years, along with the development of the related industries such as acrylic fibers, chemical industry and the like, the discharge amount of production wastewater is also sharply increased. The wastewater has the characteristics of complex water quality, large fluctuation, high concentration of organic pollutants, toxic substances, high concentration ammonia nitrogen generated by decomposing nitrogen-containing substances in the treatment process, and the like, and is recognized as refractory high-concentration organic nitrogen wastewater.
The existing methods for treating high-concentration nitrogen-containing organic wastewater containing DMAC, DMF and the like mainly comprise a physicochemical method, a chemical method and a biological method. The physicochemical method and the chemical method mainly comprise the technologies of adsorption extraction, fenton oxidation, ozone oxidation, iron-carbon micro-electrolysis, supercritical water oxidation and the like, are mainly used for pretreatment, and have the problems of large equipment investment, high energy consumption, high operation cost, further advanced treatment by coupling with a biological method, secondary pollution or a large amount of sludge and the like.
Disclosure of Invention
The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing a treatment system for high-nitrogen-content organic wastewater, which has the advantages of less equipment investment and low operation cost.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the treatment system comprises an anaerobic reactor and a partial nitrosation-anaerobic ammonia oxidation reactor which are sequentially arranged, wherein the anaerobic reactor is at least provided with a plurality of compartments and settling chambers which are sequentially arranged in the water flow direction, and the treatment system further comprises a first aeration mechanism for aerating the inside of the partial nitrosation-anaerobic ammonia oxidation reactor and a return pipeline connected between the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor and the anaerobic reactor;
the treatment system further comprises a second aeration mechanism for aerating the precipitation chamber, or the treatment system further comprises an aeration tank connected between the anaerobic reactor and the partial nitrosation-anaerobic ammoxidation reactor and a second aeration mechanism for aerating the aeration tank.
In some embodiments of the utility model, the plurality of compartments includes at least a first compartment, a second compartment, and a third compartment disposed in sequence in a water flow direction, and the return water in the return line flows back to the second compartment or the third compartment.
Further, the return pipeline comprises a return manifold, a first return branch pipe and a second return branch pipe, wherein one end of the return manifold is connected with the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor, the first return branch pipe is connected between the other end of the return manifold and the second compartment, the second return branch pipe is connected between the other end of the return manifold and the third compartment, a first valve is arranged on the first return branch pipe, and a second valve is arranged on the second return branch pipe.
In some embodiments, a delivery pump is arranged on the total reflux pipe; and the first reflux branch pipe and the second reflux branch pipe are respectively provided with a flowmeter.
In some embodiments, the treatment system further comprises a raw water tank in communication with the first compartment through a water inlet pipe; and/or the plurality of compartments includes a first compartment, a second compartment, a third compartment, and a fourth compartment sequentially arranged in a water flow direction.
In some embodiments, the settling chamber is in communication with the water inlet end of the partial nitrosation-anaerobic ammonia oxidation reactor via a first connection tube.
In other embodiments, the settling chamber is in communication with the aeration tank via a first connection tube and the aeration tank is in communication with the water inlet end of the partial nitrosation-anaerobic ammonia oxidation reactor via a second connection tube.
In some embodiments, a delivery pump is disposed on the first connecting tube; or, the second connecting pipe is provided with a delivery pump.
In some embodiments of the utility model, the first aeration mechanism comprises a first aeration head disposed at the bottom of the partial nitrosation-anaerobic ammonia oxidation reactor, and the second aeration mechanism comprises a second aeration head disposed at the bottom of the settling chamber or at the bottom of an aeration tank.
In some embodiments of the utility model, the treatment system further comprises a water outlet pipe connected to the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor, and a third valve and a flow meter are arranged on the water outlet pipe.
In some embodiments, the anaerobic reactor is an anaerobic baffle reactor or a multistage series up-flow anaerobic sludge blanket reactor.
In some specific embodiments, the partial nitrosation-anaerobic ammonia oxidation reactor is a gas lift flow reactor, sludge in the reactor moves upwards under the action of gas and simultaneously moves downwards under the action of gravity, and circulating flow is realized in the reactor, so that stable granulation and mass transfer of the sludge are facilitated.
In some embodiments of the utility model, the treatment system is provided with two sets of the anaerobic reactors and one set of the partial nitrosation-anaerobic ammonia oxidation reactors, the two sets of the anaerobic reactors and one set of the partial nitrosation-anaerobic ammonia oxidation reactors being connected.
In other embodiments of the utility model, two sets of the anaerobic reactors are connected to one set of the partial nitrosation-anaerobic ammonia oxidation reactors by the aeration tank.
In the utility model, the anaerobic baffle reactor is ABR; the partial nitrosation-anaerobic ammoxidation reactor, namely the PN/A reactor, is a single-stage full autotrophic reactor.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the treatment system is mainly used for treating the high-nitrogen-content organic wastewater by combining the anaerobic reactor and the partial nitrosation-anaerobic ammonia oxidation reactor, and has less equipment investment, low energy consumption and low running cost compared with the treatment systems adopted by the existing physicochemical method and chemical method.
Drawings
FIG. 1 is a schematic diagram of a system for treating high nitrogen content organic wastewater according to example 1;
FIG. 2 is a schematic structural diagram of a treatment system for organic wastewater with high nitrogen content in example 2;
in the figure: 1. an anaerobic baffle reactor; 1a, a first compartment; 1b, a second compartment; 1c, a third compartment; 1d, fourth compartment; 1e, a sedimentation chamber; 2. an aeration tank; 3. a partial nitrosation-anaerobic ammoxidation reactor; 4. a first aeration head; 5. a second aeration head; 6. a raw water tank; 7. a first connection pipe; 8. a second connection pipe; 9. a water inlet pipe; 10. a water outlet pipe; 11. a total return pipe; 12. a first return branch; 13. a second return branch; 14. a transfer pump; 15. a first valve; 16. a second valve; 17. a third valve; 18. a flow meter.
Detailed Description
The utility model is further described with reference to the drawings and specific examples in the specification:
example 1
Referring to the treatment system of the high nitrogen-containing organic wastewater shown in fig. 1, the treatment system comprises a raw water tank 6, an anaerobic reactor, an aeration tank 2 and a partial nitrosation-anaerobic ammoxidation reactor 3 which are sequentially arranged, wherein the raw water tank 6 is communicated with the anaerobic baffle reactor 1 through a water inlet pipe 9, and raw water in the raw water tank 6 is conveyed into the anaerobic reactor for treatment.
In this example, anaerobic reactor 1 (ABR) was used, and partial nitrosation-anaerobic ammoxidation reactor 3 was a gas lift flow reactor.
Specifically, the anaerobic baffled reactor 1 is provided with a first compartment 1a, a second compartment 1b, a third compartment 1c, a fourth compartment 1d and a sedimentation chamber 1e which are sequentially arranged in the water flow direction, the water outlet end of the sedimentation chamber 1e is communicated with the aeration tank 2 through a first connecting pipe 7, and the aeration tank 2 is also communicated with the water inlet end of the partial nitrosation-anaerobic ammonia oxidation reactor 3 through a second connecting pipe 8.
The treatment system of the high nitrogen-containing organic wastewater also comprises a first aeration mechanism for aerating into the partial nitrosation-anaerobic ammonia oxidation reactor 3, a second aeration mechanism for aerating into the aeration tank 2 and a return pipeline connected between the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor 3 and the anaerobic baffle reactor 1.
The return line comprises a return manifold 11, a first return branch pipe 12 and a second return branch pipe 13, wherein one end of the return manifold 11 is connected with the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor 3, the first return branch pipe 12 is connected between the other end of the return manifold 11 and the second compartment 1b, the second return branch pipe 13 is connected between the other end of the return manifold 11 and the third compartment 1c, a first valve 15 is arranged on the first return branch pipe 12, a second valve 16 is arranged on the second return branch pipe 13, a delivery pump 14 is arranged on the return manifold 11, and in actual operation, the first valve 15 and the second valve 16 are not opened at the same time.
In this example, the first return branch pipe 12 and the second return branch pipe 13 are further provided with flow meters 18, respectively.
In this example, the first aeration mechanism comprises a first aeration head 4 arranged at the bottom of the partial nitrosation-anaerobic ammoxidation reactor 3 and a second aeration head 5 arranged at the bottom of the aeration tank 2, and the second aeration head 5 carries out micro-aeration on the aeration tank 2.
In this example, the water inlet pipe 9 is provided with a transfer pump 14, and the second connecting pipe 8 is provided with a transfer pump 14.
In this example, the treatment system for high nitrogen content organic wastewater further comprises a water outlet pipe 10, the water outlet pipe 10 is connected to the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor 3, and a third valve 17 and a flowmeter 18 are arranged on the water outlet pipe 10.
In practical use, the first compartment 1a, the second compartment 1b, the third compartment 1c and the fourth compartment 1d of the anaerobic baffle reactor 1 are respectively filled with active anaerobic sludge, the sludge concentration VSS of the active sludge in each compartment is 50-100 g/L, the hydraulic retention time in the anaerobic baffle reactor 1 is 16-25 h, and the water quality requirement of effluent treated by the anaerobic baffle reactor 1 is as follows: TAN/TKN is more than 0.9 and less than 1.0, and COD/TAN is more than 0 and less than 1.0.
The microorganisms in the anaerobic baffled reactor 1 grow in the anaerobic granular sludge or biofilm state. The microorganisms in the partial nitrosation-anaerobic ammoxidation reactor 3 grow in suspension in the form of a granular sludge or carrier biofilm.
The oxidation-reduction potential of the wastewater subjected to micro-aeration treatment in the aeration tank 2 is adjusted to be more than 0, or the dissolved oxygen DO of the wastewater is adjusted to be more than 0.5mg/L.
The opening of the first valve 15 on the first return branch 12 and the second valve 16 on the second return branch 13 is selected according to the organic load factor OLR in the wastewater entering the anaerobic baffled reactor 1. Specifically, when the inlet water OLR is lower than 2.4 kg.m -3 ·d -1 Approximately 90% of the DMAC may be decomposed in the first compartment of the anaerobic reactor and the reflux point may be set in the second compartment. With the rise of the inlet OLR, the reflux point can gradually move backwards. When 2.4 kg.m -3 ·d -1 <OLR<4.0kg·m -3 ·d -1 The point of return may be located in the second compartment or in the third compartment. When OLR>4.0kg·m -3 ·d -1 The reflux point can be setIn the third compartment.
Furthermore, after the above-mentioned determination of the reflux point, when the nitrogen volume load rate NLR of the wastewater entering the partial nitrosation-anaerobic ammonia oxidation reactor 3 is less than 2.4 kg.m -3 ·d -1 PN/A effluent NO 3 - The N concentration can be lower than 20mg.L -1 The reflux ratio can be controlled below 50%; when the nitrogen load rate NLR of the wastewater entering the partial nitrosation-anaerobic ammonia oxidation reactor is 2.4-4.0 kg.m -3 ·d -1 PN/A effluent NO 3 - The concentration of-N is generally 20-30 mg.L -1 The reflux ratio is 50-100%; when the nitrogen load rate NLR of the wastewater entering the partial nitrosation-anaerobic ammonia oxidation reactor is more than 4.0 kg.m -3 ·d -1 PN/A effluent NO 3 - The N concentration is generally higher than 30 mg.L -1 The reflux ratio is greater than 100%.
In actual operation, the high nitrogen content organic wastewater in the raw water tank 6 contains DMAC and/or DMF, the concentration of the DMAC and/or DMF is 1000-2000 mg/L, COD-3000 mg/L, the total nitrogen is 200-300 mg/L, the total phosphorus is below 2mg/L, the total nitrogen in the effluent treated by the treatment system is less than 15mg/L, and the COD is less than 25+/-5 mg/L.
In some specific embodiments, the effective volume of the anaerobic baffle reactor 1 is 7-8L, specifically, for example, 7.4L, the anaerobic baffle reactor is composed of four compartments and a settling chamber, each compartment is provided with an independent sludge bed, the sludge phase separation effect is good, the volume ratio of an upflow area to a downflow area is 5:1, the width of each compartment is 10cm, and the average effective height is 20cm; the effective volume of the partial nitrosation-anaerobic ammonia oxidation reactor 3 was 2.2L, and the volume ratio of the upflow to the downflow was 1:1.
In some embodiments, 2 sets of anaerobic baffled reactors may be used in actual operation coupled with 1 set of partial nitrosation-anaerobic ammoxidation reactors 3.
The processing system of embodiment 1 above is further described below by way of one specific application example.
The treatment system of the high nitrogen content organic wastewater of figure 1 is used for enriching the discharge of certain acrylic fiber industrial sewage treatment plantsThe actual waste water of DMAC is treated as a treatment object, and the specific water quality condition is as follows: COD 2450-2750mg COD.L -1 The average concentration is 2600mg COD.L -1 ；DMAC1550-1645 mg·L -1 The average concentration is 1600 mg.L -1 The method comprises the steps of carrying out a first treatment on the surface of the TN (total nitrogen, mainly in the form of organic nitrogen) 250-265mg N.L -1 Average concentration of 260mg N.L -1 The method comprises the steps of carrying out a first treatment on the surface of the TP (total phosphorus) average concentration of 1.5 mg.L -1 . By adding proper amount of NaHCO 3 The pH of the inlet water is maintained between 7.5 and 7.6.
The specific treatment method for treating the wastewater by the treatment system is as follows:
s1, early preparation:
each compartment of the anaerobic baffled reactor 1 was inoculated with anaerobic sludge from UASB at a sludge concentration VSS of about 50g/L.
The partial nitrosation-anaerobic ammonia oxidation reactor 3 is inoculated with granular sludge with good nitrosation-anaerobic ammonia oxidation efficiency, the sludge concentration VSS is about 3.0g/L, and the operating temperature is 28-30 ℃.
The actual waste water rich in DMAC is stored in the raw water tank 6.
S2, introducing the wastewater in the original water tank 6 into the anaerobic baffle reactor 1 through the conveying pump 14 and the water inlet pipe 9, wherein the hydraulic retention time of the anaerobic baffle reactor is 18h, and the organic load rate OLR of the inlet water is 3 kg.m -3 ·d -1 The TAN/TKN of the ABR effluent is 0.95, and the COD/TAN is 0.17;
s3, introducing the effluent of the anaerobic baffle reactor 1 into the aeration tank 2 through a first connecting pipe 7, and starting a second aeration head 5 to perform micro-aeration so that the oxidation-reduction potential in the wastewater subjected to the micro-aeration treatment is greater than 0;
s4, introducing the effluent of the aeration tank 2 into the partial nitrosation-anaerobic ammonia oxidation reactor 3 through a second connecting pipe 8 and a conveying pump 14, opening a second valve 16, closing a first valve 15, regulating a flow meter 18 to enable the reflux ratio to be about 30%, and after stable operation, enabling the effluent quality of the partial nitrosation-anaerobic ammonia oxidation reactor 3 to be as follows: COD is less than 20+ -5 mg.L -1 Total nitrogen less than 15mg N.L -1 Wherein NH is 4 + -N、NO 2 - -N and NO 3 - The average N concentration is 2.9mg N.L -1 、0.2mg N·L -1 And 5.8mg N.L -1 。
Example 2
Referring to fig. 2, the treatment system of high nitrogen-containing organic wastewater has a structure substantially the same as that of example 1, except that: the second aeration head 5 is directly arranged in the settling chamber 1e of the anaerobic baffle reactor 1 without an aeration tank, the settling chamber 1e is connected with the water inlet end of the partial nitrosation-anaerobic ammoxidation reactor 3 through a first connecting pipe 7, and a conveying pump 14 is arranged on the first connecting pipe 7.
The treatment system is used for treating the high-nitrogen-content organic wastewater, has few using equipment and low operation cost, and can flexibly adjust the reflux site and reflux ratio according to the inlet NLR of the partial nitrosation-anaerobic ammoxidation reactor and taking the ammoniation rate TAN/TKN and the carbon nitrogen ratio COD/TAN as the pretreatment parameters of the anaerobic baffle reactor in the actual operation process, thereby realizing the aim of high-quality denitrification and carbon reduction under the conditions of organic matter utilization and low consumption.
The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. The treatment system is characterized by comprising an anaerobic reactor and a partial nitrosation-anaerobic ammoxidation reactor which are sequentially arranged, wherein the anaerobic reactor is at least provided with a plurality of compartments and settling chambers which are sequentially arranged in the water flow direction, and the treatment system further comprises a first aeration mechanism for aerating the inside of the partial nitrosation-anaerobic ammoxidation reactor and a return pipeline connected between the water outlet end of the partial nitrosation-anaerobic ammoxidation reactor and the anaerobic reactor;
the treatment system further comprises a second aeration mechanism for aerating the precipitation chamber, or the treatment system further comprises an aeration tank connected between the anaerobic reactor and the partial nitrosation-anaerobic ammoxidation reactor and a second aeration mechanism for aerating the aeration tank.
2. The system for treating high nitrogen-containing organic wastewater according to claim 1, wherein: the plurality of compartments at least comprise a first compartment, a second compartment and a third compartment which are sequentially arranged according to the water flow direction, and the return water in the return pipeline flows back to the second compartment or the third compartment.
3. The system for treating high nitrogen-containing organic wastewater according to claim 2, wherein: the reflux pipeline comprises a reflux main pipe, a first reflux branch pipe and a second reflux branch pipe, wherein one end of the reflux main pipe is connected with the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor, the first reflux branch pipe is connected between the other end of the reflux main pipe and the second compartment, the second reflux branch pipe is connected between the other end of the reflux main pipe and the third compartment, a first valve is arranged on the first reflux branch pipe, and a second valve is arranged on the second reflux branch pipe.
4. A system for treating high nitrogen content organic wastewater as claimed in claim 3, wherein: a delivery pump is arranged on the return header pipe; and the first reflux branch pipe and the second reflux branch pipe are respectively provided with a flowmeter.
5. The system for treating high nitrogen-containing organic wastewater according to claim 2, wherein: the treatment system further comprises a raw water tank which is communicated with the first compartment through a water inlet pipe; and/or the plurality of compartments includes a first compartment, a second compartment, a third compartment, and a fourth compartment sequentially arranged in a water flow direction.
6. The system for treating high nitrogen-containing organic wastewater according to any one of claims 2 to 5, wherein: the precipitation chamber is communicated with the water inlet end of the partial nitrosation-anaerobic ammonia oxidation reactor through a first connecting pipe; or the sedimentation chamber is communicated with the aeration tank through a first connecting pipe, and the aeration tank is communicated with the water inlet end of the partial nitrosation-anaerobic ammonia oxidation reactor through a second connecting pipe.
7. The system for treating high nitrogen-containing organic wastewater according to claim 6, wherein: a delivery pump is arranged on the first connecting pipe; or, the second connecting pipe is provided with a delivery pump.
8. The system for treating high nitrogen-containing organic wastewater according to any one of claims 1 to 5, wherein: the first aeration mechanism comprises a first aeration head arranged at the bottom of the partial nitrosation-anaerobic ammonia oxidation reactor, and the second aeration mechanism comprises a second aeration head arranged at the bottom of the sedimentation chamber or the bottom of the aeration tank.
9. The system for treating high nitrogen-containing organic wastewater according to any one of claims 1 to 5, wherein: the treatment system further comprises a water outlet pipe which is connected with the water outlet end of the partial nitrosation-anaerobic ammonia oxidation reactor, and a third valve and a flowmeter are arranged on the water outlet pipe.
10. The system for treating high nitrogen-containing organic wastewater according to any one of claims 1 to 5, wherein: the treatment system is provided with two groups of anaerobic reactors and one group of partial nitrosation-anaerobic ammonia oxidation reactors, wherein the two groups of anaerobic reactors are connected with one group of partial nitrosation-anaerobic ammonia oxidation reactors, or the two groups of anaerobic reactors are connected with one group of partial nitrosation-anaerobic ammonia oxidation reactors through the aeration tank; and/or the number of the groups of groups,
the anaerobic reactor is an anaerobic baffle reactor or a multistage series up-flow anaerobic sludge bed reactor; and/or the number of the groups of groups,
the partial nitrosation-anaerobic ammoxidation reactor is an air lift flow reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322450018.9U CN220766702U (en) | 2023-09-11 | 2023-09-11 | High nitrogen-containing organic wastewater's processing system |
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