CN113277679A - Nitrile-containing organic wastewater treatment process - Google Patents
Nitrile-containing organic wastewater treatment process Download PDFInfo
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- CN113277679A CN113277679A CN202110603425.1A CN202110603425A CN113277679A CN 113277679 A CN113277679 A CN 113277679A CN 202110603425 A CN202110603425 A CN 202110603425A CN 113277679 A CN113277679 A CN 113277679A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 150000002825 nitriles Chemical class 0.000 title claims abstract description 24
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- 239000002351 wastewater Substances 0.000 claims abstract description 123
- 239000010802 sludge Substances 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000010865 sewage Substances 0.000 claims abstract description 23
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- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 12
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 11
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- 230000000593 degrading effect Effects 0.000 claims abstract description 10
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 8
- 238000005842 biochemical reaction Methods 0.000 claims abstract description 7
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims abstract description 4
- 239000002912 waste gas Substances 0.000 claims description 30
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 claims description 14
- 238000004062 sedimentation Methods 0.000 claims description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000009615 deamination Effects 0.000 claims description 6
- 238000006481 deamination reaction Methods 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 230000003851 biochemical process Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
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- 239000000706 filtrate Substances 0.000 claims description 3
- 125000000623 heterocyclic group Chemical group 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 238000007142 ring opening reaction Methods 0.000 claims description 3
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- 239000007800 oxidant agent Substances 0.000 claims description 2
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- 238000006297 dehydration reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
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- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
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- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000026676 system process Effects 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001350 alkyl halides Chemical class 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
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- 238000013016 damping Methods 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- XQZYPMVTSDWCCE-UHFFFAOYSA-N phthalonitrile Chemical compound N#CC1=CC=CC=C1C#N XQZYPMVTSDWCCE-UHFFFAOYSA-N 0.000 description 1
- 229920006391 phthalonitrile polymer Polymers 0.000 description 1
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical class [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
-
- 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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- 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
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a nitrile-containing organic wastewater treatment process, which comprises the following steps: s1, introducing the nitrile-containing organic wastewater into a wastewater pretreatment unit; s2, sending the pretreated wastewater obtained in the step S1 into a comprehensive adjusting tank in a biochemical treatment unit, and degrading pollutants which are difficult to degrade under the hydrolysis and acidification action of anaerobic bacteria; s3, feeding the wastewater obtained by hydrolyzing and acidifying the pond in the S2 into an EGSB pond, and fully contacting organic matters with anaerobic granular sludge in the EGSB pond to generate biochemical reaction so as to reduce the COD value of the wastewater; and S4, feeding the wastewater obtained from the EGSB tank in the S3 into an A/O tank, and fully degrading organic matters in the wastewater by using different types of microorganisms to form sludge. The invention carries out biochemical treatment on the pretreated nitrile-containing organic wastewater, is suitable for treating the organic wastewater with water quality greatly changing along with products, can effectively denitrify and remove most COD, and realizes that the effluent reaches the standard and is discharged.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a treatment process of nitrile-containing organic wastewater.
Background
Nitriles, which are organic compounds having a carbon atom linkage of a hydrocarbyl group and a cyano group, can be prepared by nucleophilic substitution of potassium cyanide and an alkyl halide in water or a solution having similar chemical properties to water, and have the general formula (Ar) R-CN. Nitriles are colorless liquids or solids, have special odors, are easily decomposed in the presence of acids or bases, and are commonly used for synthetic resins, fibers, rubbers, medicines, dyes, and the like. The waste water in the production process of phthalonitrile and other products at present contains nitrile-containing pollutants due to cyanide ions (CN)-) Precipitation, this type of waste water utensilHas certain biological toxicity, so the waste water can be discharged after reaching the standard after being treated.
Patent publication No. CN104529072B discloses a system and a method for treating polyvinyl alcohol wastewater, which is characterized in that: a polyvinyl alcohol wastewater treatment system comprises: the wastewater treatment device comprises a pretreatment unit, a biochemical treatment unit and an advanced treatment unit which are connected in sequence, and aims to solve the technical problem of effectively treating PVA production wastewater under low energy consumption, so that the effluent reaches the reuse water standard of circulating cooling water, and the wastewater recycling is met; when the nontoxic polyvinyl alcohol is degraded in the method, the biological toxicity of the wastewater does not need to be considered, and the treatment method is simpler and is not suitable for treating the organic wastewater with biological toxicity.
The patent with publication number CN111170545A discloses a pesticide wastewater treatment system and process, including pretreatment unit and biochemical treatment unit, its characterized in that, wherein the biochemical treatment unit includes comprehensive equalizing basin, anaerobism biochemical pond, good oxygen biochemical pond and two heavy ponds that connect gradually, still includes advanced treatment unit, sludge treatment unit and exhaust treatment unit, the technical problem that this patent will be solved is to reduce salt content, COD concentration and total nitrogen concentration, the waste water in the effective processing production process, realize discharge to reach standard, reduce the pollution to the environment. The method utilizes a high-temperature evaporation method for desalting, utilizes a rectification method for recovering methanol, dichloromethane and the like, has long treatment time, cannot recover and utilize heat, has higher input cost and more complicated treatment method, and is not suitable for treating organic wastewater with large water quality change.
The patent with publication number CN104478173B discloses a coal chemical industry enterprise wastewater treatment and recycling integrated treatment process, which comprises a pretreatment system process, a biochemical system treatment process, an advanced treatment system process, a deodorization process, sludge treatment generated by the wastewater treatment of the coal chemical industry enterprise and byproduct treatment generated by the wastewater treatment of the coal chemical industry enterprise, wherein a high-efficiency biofilm reactor and a fluidized bed biofilm reactor (MBBR) are disclosed in the biochemical system treatment process, and the MBBR needs to add fillers into the reactor, so that the problems of filler accumulation and scaling easily occur.
Disclosure of Invention
The invention aims to provide a nitrile-containing organic wastewater treatment process, which is used for carrying out biochemical treatment on pretreated nitrile-containing organic wastewater, has high impact load resistance of a system, is suitable for treating organic wastewater with water quality greatly changing along with products, can effectively denitrify and remove most COD (chemical oxygen demand), realizes standard discharge of effluent and solves the problems in the background art.
The invention is realized by the following technical scheme:
a treatment process of nitrile-containing organic wastewater comprises the following specific steps:
s1, introducing nitrile-containing organic wastewater in the production process of products into a wastewater pretreatment unit, performing deamination treatment through an ammonia still, introducing the deaminated wastewater into an oxidative cyanogen breaking unit, performing oxidative cyanogen breaking by using sodium hypochlorite, and collecting waste gas generated in the wastewater pretreatment unit;
s2, sending the pretreated wastewater obtained in the S1 and other wastewater with low nitrile concentration, such as low-concentration nitrile-containing wastewater and domestic sewage, into a comprehensive adjusting tank in a biochemical treatment unit, homogenizing and homogenizing the wastewater in the comprehensive adjusting tank, and then lifting the wastewater into a hydrolysis acidification tank according to the toxic load of a rear-end biochemical process by a lifting pump, wherein long-chain, benzene ring, heterocyclic ring and other non-degradable pollutants in the wastewater are subjected to ring opening and chain breaking under the action of anaerobic bacteria hydrolysis acidification to form biodegradable micromolecular pollutants, at the moment, the biodegradability of the wastewater is improved, and waste gas generated in the hydrolysis acidification reaction is collected;
s3, feeding the wastewater obtained by hydrolyzing and acidifying the pond in the S2 into an EGSB (expanded granular sludge bed) pond, fully contacting organic matters in the wastewater with anaerobic granular sludge in the EGSB pond to generate biochemical reaction, finally converting the organic matters in the wastewater into gas, reducing the COD value of the wastewater at the moment, and collecting waste gas generated by the biochemical reaction;
s4, feeding the wastewater obtained from the EGSB tank in the S3 into an A/O tank, fully degrading organic matters in the wastewater by using different types of microorganisms in an anoxic, aerobic, facultative and other modes to form sludge, further reducing the COD value of the wastewater, simultaneously realizing biological denitrification, collecting waste gas generated by degrading the organic matters by the microorganisms, introducing degraded sludge water in the A/O tank into a secondary sedimentation tank, returning the sludge to the A tank in the A/O tank through a pump for circulation after separating the sludge water, fully mixing the wastewater and the microorganisms to form high-concentration granular sludge by using the circulation, and simultaneously reducing the biotoxicity;
s5, discharging the filtrate obtained after the mud-water separation in the secondary sedimentation tank in the step S4 into a discharge tank, detecting the sewage in the discharge tank, and conveying the sewage to a set sewage pipe network after the sewage discharge standard is met;
s6, discharging the residual sludge in the secondary sedimentation tank in the S4 to a sludge concentration tank through a sludge pump, after the sludge is settled, conveying supernatant liquor back to the comprehensive adjusting tank, pumping the lower concentrated sludge into a screw-stacking dewatering machine through the pump for dewatering, and transporting the dewatered sludge outside;
and S7, conveying the waste gas collected in S1-S4 into a waste gas treatment unit through a pipeline after the waste gas is subjected to spray water washing, uniformly treating the waste gas by adopting an RTO (regenerative thermal oxidizer) incineration mode, and discharging the waste gas after the waste gas reaches the waste gas discharge standard.
Preferably, in S2, the upflow velocity of the hydrolytic acidification tank exceeds 3 m/h.
Preferably, in S3, the organic matter in the wastewater is sufficiently reacted with the anaerobic granular sludge in the EGSB tank to obtain products including hydrogen, acid, methane, and the like.
Preferably, in S4, the sludge reflux ratio after the sludge-water separation is 400%.
Preferably, in S6, the water content of the sludge after concentration is 98% and the water content of the sludge after dehydration is 80%.
As a further scheme of the invention: the utility model provides a nitrile organic wastewater's processing apparatus realizes by nitrile organic wastewater's processing apparatus, processing apparatus is including the waste water pretreatment unit that is used for reducing waste water biotoxicity, the biochemical treatment unit and the sludge treatment unit that are used for improving waste water biochemical nature that connect in order, still including the exhaust-gas treatment unit who is connected with waste water pretreatment unit, biochemical treatment unit respectively, wherein: the wastewater pretreatment unit comprises a sewage collection tank, an ammonia still for deamination and a reaction tank for oxidizing and breaking cyanogen, which are connected in sequence; the biochemical treatment unit comprises a comprehensive adjusting tank, a hydrolysis acidification tank, an EGSB (expanded granular sludge bed) tank, an A/O (anoxic/oxic) tank, a secondary sedimentation tank and a discharge tank, wherein the comprehensive adjusting tank is used for uniformly feeding water, the hydrolysis acidification tank is used for improving the biochemical property of the wastewater, the EGSB tank is used for carrying out biochemical treatment on the wastewater, the A/O tank is used for degrading organic matters by microorganisms, the secondary sedimentation tank is used for fully mixing the wastewater and the microorganisms, and the discharge tank is used for discharging sludge.
Preferably, an emergency pool for temporarily storing wastewater when the wastewater collection pool has problems is arranged in the wastewater pretreatment unit.
Preferably, a temperature adjusting device and a sampling device for monitoring the salinity of the wastewater and the characteristic pollutants are arranged in the comprehensive adjusting tank.
Preferably, the A/O pool is divided into an A pool and an O pool, and the volume ratio of the A pool to the O pool is 1: and 3, an underwater impeller is arranged in the tank A, and a rotary cutting aeration head for improving the dissolved oxygen rate is arranged in the tank O.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with CN104529072B, the method carries out targeted pretreatment on the cyanide-containing organic wastewater, can reduce the biotoxicity of the wastewater, improve the biodegradability of the wastewater and ensure the stable operation of a biochemical process.
2. Compared with CN111170545A, the invention has a water collecting tank and a comprehensive adjusting tank, can fully adjust the water quality, improves the shock load resistance of the system by arranging an emergency tank with good buffer effect on the sewage discharged by accident during production, and is suitable for the waste water with the water quality greatly changing along with the product.
3. Compared with CN104478173B, the anaerobic process with EGSB added in the invention has strong biological toxicity, fully expands the granular sludge bed, avoids the generation of dead angles in the EGSB tank, can fully contact the waste water with microorganisms, enhances the mass transfer effect and improves the waste water treatment efficiency.
4. The invention adopts the A/O process, and fully mixes the wastewater and the microorganisms by utilizing circulation to form high-concentration granular sludge, thereby effectively denitrifying and removing most of COD.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the process of the present invention;
FIG. 2 is a schematic process flow diagram of the A/O cell of the present invention.
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.
The present invention will be further described with reference to the following examples.
Example 1:
as shown in figure 1-2, the organic waste water that contains nitrile in the product production process lets in waste water pretreatment unit earlier, and waste water lets in ammonia still from the waste water collecting pool and carries out the deamination processing, lets in the reaction tank after the waste water deamination, utilizes sodium hypochlorite to carry out the oxidation reaction and breaks cyanogen, can reduce the biotoxicity of waste water, collects the waste gas that produces in the waste water pretreatment unit to the waste gas treatment unit who is connected with waste water pretreatment unit.
TABLE 1 Water quality Standard of the Integrated Conditioning tank
The pretreated wastewater and other wastewater with low nitrile concentration or domestic sewage are sent into a comprehensive adjusting tank in a biochemical treatment unit, and the water quality standard of inlet water is shown in table 1. According to the toxic load of the back-end biochemical process, the wastewater is lifted to a hydrolytic acidification tank through a lifting pump, the rising flow speed is set to be more than 3m/h, long-chain, benzene ring, heterocyclic ring and other non-degradable pollutants in the wastewater are subjected to ring opening and chain breaking under the action of anaerobic bacteria hydrolysis acidification to form easily biodegradable micromolecular pollutants, and the biodegradability of the wastewater is improved. And then the wastewater after hydrolytic acidification is sent to the bottom end of the EGSB tank, the upflow speed is set to be 4-10 m/h, small molecular organic matters in the wastewater fully contact with anaerobic granular sludge in the EGSB tank to carry out biochemical reaction to obtain products such as hydrogen, acid, methane and the like, most organic matters in the wastewater are finally converted into gas, and the COD value of the wastewater is reduced. And then sending the wastewater obtained from the EGSB tank into an A/O tank, wherein the A/O tank comprises a water tank with a volume ratio of 1: and 3, the A tank and the O tank are used for fully degrading residual organic matters in the wastewater by different types of microorganisms in an anoxic, aerobic, facultative and other modes, realizing biological denitrification by utilizing the nitrification and denitrification of organisms, forming sludge by the organic matters, further reducing the COD value of the wastewater, and collecting waste gas spray water generated by hydrolytic acidification reaction, biochemical reaction and microbial degradation to a waste gas treatment unit connected with the biochemical treatment unit through a pipeline after the waste gas spray water is washed. The waste gas collected in the waste gas treatment unit is treated in a unified way by an RTO incineration mode and is discharged after reaching the waste gas discharge standard.
The muddy water after degrading in the A/O pond is introduced into a secondary sedimentation pond, muddy water is separated in the secondary sedimentation pond, the sludge is conveyed back to the A pond through a pump, the reflux ratio of mixed liquid is set to be 400%, waste water and microorganisms are fully mixed by utilizing circulation to form high-concentration granular sludge, the toxicity of the waste water is effectively reduced, the decomposition efficiency of organic compounds is improved, and the ammonia nitrogen removal rate is improved. Discharging the filtrate obtained after the mud-water separation of the secondary sedimentation tank into a discharge tank, detecting the sewage in the discharge tank, conveying the sewage to a set sewage pipe network after ensuring that the sewage reaches a sewage discharge standard (see table 2), discharging the residual sludge in the secondary sedimentation tank into a sludge concentration tank through a sludge pump, after the sludge is settled, conveying the supernatant back to a comprehensive adjusting tank, pumping the sludge with the water content of 98% after the concentration of the lower layer into a spiral shell stacking dehydrator through the pump for dehydration, wherein the water content of the sludge after the dehydration is 80%, and transporting the sludge after the dehydration outwards.
TABLE 2 Water quality discharge Standard for Sewage pipe network
Example 2:
this example is the same as example 1 except that: the waste water with low nitrile concentration and domestic sewage which are not pretreated are directly sent into a comprehensive adjusting tank in a biochemical treatment unit, and the water quality standard of inlet water is shown in table 1. The subsequent wastewater treatment was performed in accordance with the toxic load of the back-end biochemical process in steps S2-S7, and the rest was the same as in example 1.
Example 3:
this example is the same as example 1 except that: be equipped with the emergent pond that is used for keeping in waste water when the problem appears in the pretreatment of waste water unit, emergent pond has good cushioning effect to the sewage of accidental discharge when producing, can improve the shock resistance load capacity of system, is provided with temperature regulation apparatus and the sampling device who is used for monitoring waste water salinity and characteristic pollutant in the comprehensive regulation pond, is convenient for confirm the quality of water situation. The pool A is internally provided with an underwater flow impeller for flow pushing and stirring, the underwater flow impeller and the wastewater generate good damping effect in a low-speed motion state, so that the wastewater and the granular sludge uniformly flow, the pool O is internally provided with a rotary cutting aeration head for improving the dissolved oxygen rate, the rotary cutting aeration mode is not easy to block, the treatment stability is good, and the rest is the same as that of the embodiment 1.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A treatment process of nitrile-containing organic wastewater is characterized by comprising the following steps: the method comprises the following specific steps:
s1, introducing nitrile-containing organic wastewater in the production process of products into a wastewater pretreatment unit, performing deamination treatment through an ammonia still, introducing the deaminated wastewater into an oxidative cyanogen breaking unit, performing oxidative cyanogen breaking by using sodium hypochlorite, and collecting waste gas generated in the wastewater pretreatment unit;
s2, feeding the pretreated wastewater obtained in S1 and other wastewater with low nitrile concentration into a comprehensive adjusting tank in a biochemical treatment unit, homogenizing and homogenizing the wastewater in the comprehensive adjusting tank, and then pumping the wastewater into a hydrolysis acidification tank through a lift pump according to the toxic load of a rear-end biochemical process, wherein long-chain, benzene ring, heterocyclic ring and other non-degradable pollutants in the wastewater are subjected to ring opening and chain breaking under the action of anaerobic bacteria hydrolysis acidification to form biodegradable micromolecular pollutants, at the moment, the biodegradability of the wastewater is improved, and the waste gas generated in the hydrolysis acidification reaction is collected;
s3, feeding the wastewater obtained by hydrolyzing and acidifying the pond in the S2 into an EGSB pond, wherein organic matters in the wastewater are fully contacted with anaerobic granular sludge in the EGSB pond to generate biochemical reaction, the organic matters in the wastewater are finally converted into gas, the COD value of the wastewater is reduced, and waste gas generated by the biochemical reaction is collected;
s4, feeding the wastewater obtained from the EGSB tank in the S3 into an A/O tank, fully degrading organic matters in the wastewater by using different types of microorganisms in an anoxic, aerobic, facultative and other modes to form sludge, further reducing the COD value of the wastewater, simultaneously realizing biological denitrification, collecting waste gas generated by degrading the organic matters by the microorganisms, introducing degraded sludge water in the A/O tank into a secondary sedimentation tank, returning the sludge to the A tank in the A/O tank through a pump for circulation after separating the sludge water, fully mixing the wastewater and the microorganisms to form high-concentration granular sludge by using the circulation, and simultaneously reducing the biotoxicity;
s5, discharging the filtrate obtained after the mud-water separation in the secondary sedimentation tank in the step S4 into a discharge tank, detecting the sewage in the discharge tank, and conveying the sewage to a set sewage pipe network after the sewage discharge standard is met;
s6, discharging the residual sludge in the secondary sedimentation tank in the S4 to a sludge concentration tank through a sludge pump, after the sludge is settled, conveying supernatant liquor back to the comprehensive adjusting tank, pumping the lower concentrated sludge into a screw-stacking dewatering machine through the pump for dewatering, and transporting the dewatered sludge outside;
and S7, conveying the waste gas collected in S1-S4 into a waste gas treatment unit through a pipeline after the waste gas is subjected to spray water washing, uniformly treating the waste gas by adopting an RTO (regenerative thermal oxidizer) incineration mode, and discharging the waste gas after the waste gas reaches the waste gas discharge standard.
2. The process according to claim 1, wherein: in S2, the upflow speed of the hydrolytic acidification tank exceeds 3 m/h.
3. The process according to claim 1, wherein: in S3, organic matters in the wastewater fully react with anaerobic granular sludge in the EGSB tank to obtain products including hydrogen, acid and methane, and the products are collected by corresponding equipment.
4. The process according to claim 1, wherein: in S4, the sludge reflux ratio after the sludge-water separation was 400%.
5. The process according to claim 1, wherein: in S6, the water content of the concentrated sludge is 98% and the water content of the dewatered sludge is 80%.
6. The process according to claim 1, wherein the treatment is carried out by a treatment apparatus for nitrile-containing organic wastewater, the treatment apparatus comprising a wastewater pretreatment unit for reducing biotoxicity of wastewater, a biochemical treatment unit for improving biochemical property of wastewater and a sludge treatment unit connected in series, and further comprising an exhaust gas treatment unit connected to the wastewater pretreatment unit and the biochemical treatment unit, respectively, wherein: the wastewater pretreatment unit comprises a sewage collection tank, an ammonia still for deamination and a reaction tank for oxidizing and breaking cyanogen, which are connected in sequence; the biochemical treatment unit comprises a comprehensive adjusting tank, a hydrolysis acidification tank, an EGSB (expanded granular sludge bed) tank, an A/O (anoxic/oxic) tank, a secondary sedimentation tank and a discharge tank, wherein the comprehensive adjusting tank is used for uniformly feeding water, the hydrolysis acidification tank is used for improving the biochemical property of the wastewater, the EGSB tank is used for carrying out biochemical treatment on the wastewater, the A/O tank is used for degrading organic matters by microorganisms, the secondary sedimentation tank is used for fully mixing the wastewater and the microorganisms, and the discharge tank is used for discharging sludge.
7. The process according to claim 6, wherein: an emergency pool used for temporarily storing wastewater when the wastewater collecting pool goes wrong is arranged in the wastewater pretreatment unit.
8. The process according to claim 6, wherein: and a temperature adjusting device and a sampling device for monitoring the salinity of the wastewater and characteristic pollutants are arranged in the comprehensive adjusting tank.
9. The process according to claim 6, wherein: the A/O pool is divided into an A pool and an O pool, and the volume ratio of the A pool to the O pool is 1: and 3, an underwater impeller is arranged in the tank A, and a rotary cutting aeration head for improving the dissolved oxygen rate is arranged in the tank O.
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