CN112174441A - System and method for treating and recycling machining wastewater by using air flotation pretreatment, biochemistry and double-membrane method - Google Patents
System and method for treating and recycling machining wastewater by using air flotation pretreatment, biochemistry and double-membrane method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- 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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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02F2303/04—Disinfection
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Abstract
The invention discloses a method for treating machining production wastewater by utilizing a system for treating and recycling machining wastewater by using an air flotation pretreatment + biochemical + double-membrane method, wherein the system comprises a material wastewater collection tank, an oil separation tank, an air flotation tank, an A/O biochemical tank, an MBR tank, an intermediate water tank, an ultrafiltration system, a reverse osmosis system, a concentrated solution treatment system and a sludge treatment system; the method comprises the following steps: (1) collecting the wastewater by a wastewater collection tank, treating the wastewater by an oil separation tank, and lifting the wastewater to an air flotation tank; (2) respectively adding alkali, PAC and PAM into a reaction zone of an air floatation tank, and allowing the wastewater subjected to air floatation treatment to automatically flow into an A/O biochemical tank; (3) the effluent treated by the A/O biochemical tank enters an MBR tank, and the effluent treated by the MBR tank enters an intermediate water tank; (4) the water in the middle water tank is lifted to the ultrafiltration system by the high-pressure pump, the ultrafiltration effluent enters the RO system, and the clear water treated by the three-level RO system is recycled after being subjected to ultraviolet disinfection. The method has the characteristics of good treatment effect, strong impact load resistance, high reuse rate of reuse water, stable reuse water quality and the like.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a system and a method for treating and recycling machining wastewater by using an air flotation pretreatment method, a biochemical method and a double-membrane method.
Background
At the present stage, the consumption of machining wastewater in China is large, the treatment effect is poor, and the recycling can be achieved. The domestic wastewater treatment process for machining production is mainly based on a biological method, most enterprises build sewage treatment stations by themselves, but the treatment effect is not good, and the recycling requirements can be stably met.
The physical treatment technology of the machining production wastewater at present mainly comprises an air floatation method, an adsorption method and a coagulation method, and mainly removes oil, chroma, COD and the like. The air floating method is characterized in that dissolved air floating is selected, air sent into an air tank by an air compressor is brought into a dissolved air tank through a jet device, is forcibly dissolved in water under the pressure of 0.35MPa to form dissolved air water, and is sent into an air floating tank. Under the condition of sudden release, air dissolved in water is separated out to form a large number of micro-bubble groups, the micro-bubble groups are fully contacted with suspended matters in the sewage which is pumped and flocculated after dosing, and the micro-bubble groups are adsorbed in the flocculated suspended matters in the slow rising process, so that the density of the micro-bubble groups is reduced and the micro-bubble groups float to the water surface, and the purpose of removing SS, COD and oil is achieved. The adsorption method is to use an adsorbent having a strong adsorption capacity to adsorb one or more components in the wastewater on the surface. In the treatment of machining production wastewater, an adsorption method is mainly used for pretreatment and advanced treatment, different adsorbents have different selectivity for wastewater adsorption, but the adsorbents generally have good adsorption effect and higher cost, and the regeneration process is difficult. The coagulation method is one of the physical and chemical treatment methods frequently used for machining waste water. The coagulation method is mainly characterized in that macromolecular organic matters are coagulated into flocs by a flocculating agent, and then sludge-water separation is realized in a sedimentation tank. The coagulation method has simple process, low cost and high treatment efficiency on insoluble suspended matters. However, the removal effect of organic substances with high water solubility is poor, the amount of sludge is large, and subsequent treatment and disposal are required. The biological method mainly comprises the steps of oxidizing and degrading macromolecular organic matters into micromolecular organic matters through microbial anaerobic reaction, simultaneously converting organic C into methane through fermentation reaction, and simultaneously removing ammonia nitrogen by combining other biochemical processes. The processing difficulty of the machining wastewater is very high, and the biodegradability needs to be improved by combining a physical coagulation method and a chemical oxidation method, so that the biological method mainly plays a role in improving the biodegradability and reducing COD. The membrane method can achieve the purposes of efficiently removing pollutants and deeply desalting through the filtration of ultrafiltration membranes, reverse osmosis membranes and other membranes.
Especially, the removal of oil and COD in the machining wastewater greatly affects the service life of the subsequent membrane and the time of pollution and blockage, and the frequent membrane backwashing and membrane replacement bring great labor cost, medicament cost and membrane replacement cost for enterprises. Therefore, how to efficiently, inexpensively and stably remove oil and COD of machining wastewater and stably operate a membrane and how to ensure stable water yield and water quality of a membrane system are technical problems which need to be solved urgently at present.
Disclosure of Invention
The invention mainly aims to provide a system and a method for recycling machining wastewater by utilizing oil separation air flotation pretreatment, A/O + MBR + ultrafiltration + reverse osmosis treatment, aiming at the problems that the oil content and COD in the machining wastewater have great influence on the service life of a subsequent membrane and the time of pollution blockage, and the frequent membrane backwashing and membrane replacement bring great labor cost, medicament cost and membrane replacement cost to enterprises, so that the high-efficiency stable treatment and recycling of the machining wastewater can be realized.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
The invention provides a method for treating machining production wastewater by using a system for treating and recycling machining wastewater by using an air flotation pretreatment, a biochemical method and a double-membrane method, which is characterized by comprising the following steps of: the system for treating and recycling machining wastewater by using the air flotation pretreatment, the biochemistry and the double-membrane method comprises a material wastewater collecting tank, an oil separating tank, an air flotation tank, an A/O biochemical tank, an MBR tank, an intermediate water tank, an ultrafiltration system, a reverse osmosis system, a concentrated solution treatment system and a sludge treatment system; the A/O biochemical tank comprises a facultative tank and an aerobic tank which are connected in sequence; the method comprises the following steps:
(1) workshop production wastewater is collected by a wastewater collection tank, subjected to oil removal treatment by an oil removal tank and lifted to an air flotation tank by a wastewater lifting pump;
(2) respectively adding alkali, PAC (polyaluminium chloride) and PAM (polyacrylamide) into a reaction zone of an air floatation tank, allowing the wastewater subjected to air floatation treatment to automatically flow into an A/O (anoxic/oxic) biochemical tank, controlling the reflux ratio of nitrifying liquid to be 200-300% according to the content of ammonia nitrogen in effluent, and performing enhanced denitrification treatment;
(3) the effluent treated by the A/O biochemical tank enters an MBR tank, and the effluent after aerobic biochemical treatment in the MBR tank and MBR membrane filtration is pumped to an intermediate water tank by an effluent self-priming pump under negative pressure;
(4) waste water in the middle pond is promoted to the ultrafiltration system by the high-pressure pump, and the ultrafiltration goes out the water and gets into one-level RO system, and the dense water of one-level RO system gets into tertiary RO system, and the fresh water gets into second grade RO system, and the dense water of second grade RO system returns one-level RO system and handles, and the fresh water of tertiary RO gets into second grade RO system, and the concentration of tertiary RO is handled as danger waste, and the fresh water after the second grade RO system is handled is retrieval and utilization behind the ultraviolet disinfection.
The method described above, characterized by: in step (2), the reaction zone of the air floatation tank is divided into three lattices, the reaction zone is lifted by a wastewater lift pump of a collecting tank to enter a first lattice, industrial liquid caustic soda is added to control the pH value to be 8-9, the water discharged from the first lattice enters a second lattice, a flocculating agent PAC is added into the second lattice, the water discharged from the second lattice enters a third lattice, anion high molecular weight PAM is added into the third lattice to enhance the coagulation effect, the discharged water enters an air floatation zone after reaction, suspended matters and oil are removed from the upper part through air floatation reaction, particles are settled from the lower part, and clear water in the middle part enters an A/O system.
The method described above, characterized by: and (3) controlling the reflux ratio of the nitrifying liquid in the A/O treatment system in the step (2) to be 200-300%.
The method described above, characterized by: and (4) controlling the sludge reflux ratio of the MBR tank in the step (3) to be 50-150%.
The method described above, characterized by: in the step (3), the MBR membrane in the MBR treatment system adopts an immersed flat plate membrane, and the membrane flux is 0.2-0.3 m3/m2.d。
The method described above, characterized by: the COD of the inlet water of the whole system is not more than 5000mg/L, and the salt concentration is not more than 6000 mg/L.
By the technical scheme, the invention at least has the following advantages:
(1) after the machining production wastewater is pretreated by the oil separation tank and the air floatation tank, part of organic matters, suspended matters and oil contents, particularly oil contents and organic matters in the wastewater can be effectively treated, and the stable operation of a subsequent biochemical system and a membrane treatment system can be effectively ensured.
(2) The machining wastewater enters the A/O system and the MBR system after being pretreated, so that pollutants such as organic matters, ammonia nitrogen and the like in the wastewater can be effectively removed, the water quality of the subsequent ultrafiltration and RO systems can be effectively ensured, the service lives and the cleaning frequency of the ultrafiltration membrane and the RO are effectively ensured, the operation cost of an enterprise can be effectively reduced, and the replacement and maintenance cost of the ultrafiltration membrane and the RO membrane is reduced.
(3) The machining wastewater enters the ultrafiltration and RO systems after being treated by the oil separation tank, the air flotation tank, the A/O system and the MBR system, and the ultrafiltration and three-stage RO systems can effectively ensure the reuse water amount of the wastewater and reduce the generation amount of hazardous waste.
In conclusion, the method for treating the machining production wastewater by the system for treating and recycling the machining wastewater by using the air flotation pretreatment, the biochemical treatment and the double-membrane method has the characteristics of high efficiency, low cost, stable oil removal, COD removal and membrane stable operation of the machining wastewater, stable water yield and water quality guarantee of a membrane system and the like.
The method has the advantages and practical value, does not have similar design publication or use but is really innovative in the similar method, has great improvement on the method or the function, has great technical progress, produces good and practical effects, and has multiple enhanced effects compared with the prior method, thereby being more suitable for practical use, having industrial wide utilization value and being a novel, improved and practical new design.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a process flow diagram of the method of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the technical scheme of the embodiment of the invention will be clearly and completely described below with the embodiment of the invention and the accompanying drawings, and obviously, the described embodiment is only a part of the embodiment of the invention, but not the whole embodiment. 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.
Referring to fig. 1, a method for treating machining wastewater by using a system for treating and recycling machining wastewater by using air flotation pretreatment, biochemical treatment and double-membrane method according to a preferred embodiment of the present invention is applied to a wastewater treatment station of a certain exotic machining enterprise in the tin-free city of Jiangsu province.
The wastewater treatment station mainly comprises a wastewater collection tank, an oil separation tank, an air floatation tank, an anoxic tank, an aerobic tank, an MBR tank, an intermediate water tank, a precision filter, an ultrafiltration system, a primary RO system, a secondary RO system, a tertiary RO system, a low-temperature evaporation system, an ultraviolet disinfection system, a sludge treatment system and the like.
The treatment capacity of the oil separation tank is 60t/d, the treatment capacity of the air flotation tank is 60t/d, the A/O system consists of an A tank and an O tank which are connected in series, the retention time is respectively 8h and 16h, the A tank is provided with a stirring system, and the O tank is provided with a microporous aerator; the retention time of the MBR tank is 10h, an aeration system and an immersed MBR flat membrane are arranged, and the nitrified liquid in the MBR tank flows back through two reflux pumps, one for use and the other for standby; the water outlet of the MBR tank is sucked by negative pressure of two self-priming pumps, and one is used and the other is prepared. The treatment capacity of the ultrafiltration membrane system is 60t/d, water after ultrafiltration treatment enters a primary RO system, the treatment capacity of the primary RO system is 75t/d, the generated concentrated water amount is 22.5t/d, the generated fresh water amount is 52.5t/d, 22.5t/d concentrated water generated by the primary RO system enters a tertiary RO system, 3t/d concentrated water generated by the tertiary RO system generates fresh water 22t/d, 3t/d concentrated water generated by the tertiary RO enters a low-temperature evaporation system, 22t/d fresh water generated by the tertiary RO enters a secondary RO system, the treatment capacity of the secondary RO system is (52.5+22) t/d, 15t/d concentrated water generated by the secondary RO system enters the primary RO system for treatment, 59.5t/d fresh water generated by the secondary RO system enters an ultraviolet disinfection system for disinfection and recycling. The treatment capacity of the low-temperature evaporation system is 3t/d, wherein 2.5t/d of condensed water enters the three-level RO system, and 0.5t/d of hazardous waste is subjected to outsourcing treatment. Sludge generated by the pretreatment system and the biochemical system is dehydrated by the sludge treatment system and then treated as hazardous waste.
In the treatment system, the COD of raw water is 2000mg/L, the ammonia nitrogen is 30mg/L, the COD after the oil removal by air floatation is 1400mg/L and the ammonia nitrogen is 20mg/L, the COD is less than 100mg/L and the ammonia nitrogen is less than 10mg/L after the treatment by the A/O system and the MBR system, the recovery rate of the primary RO system reaches 70%, and the recovery rate of the secondary RO system reaches 80%. The amount of the reuse water treated by the ultrafiltration and RO systems reaches more than 98 percent, and various indexes such as COD, ammonia nitrogen, oil content and the like meet the reuse requirements.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method for treating machining production wastewater by using a system for treating and recycling machining wastewater by using an air flotation pretreatment method, a biochemical method and a double-membrane method is characterized by comprising the following steps of: the system for treating and recycling machining wastewater by using the air flotation pretreatment, the biochemistry and the double-membrane method comprises a material wastewater collecting tank, an oil separating tank, an air flotation tank, an A/O biochemical tank, an MBR tank, an intermediate water tank, an ultrafiltration system, a reverse osmosis system, a concentrated solution treatment system and a sludge treatment system; the A/O biochemical tank comprises a facultative tank and an aerobic tank which are connected in sequence; the method comprises the following steps:
(1) workshop production wastewater is collected by a wastewater collection tank, subjected to oil removal treatment by an oil removal tank and lifted to an air flotation tank by a wastewater lifting pump;
(2) respectively adding alkali, PAC (polyaluminium chloride) and PAM (polyacrylamide) into a reaction zone of an air floatation tank, allowing the wastewater subjected to air floatation treatment to automatically flow into an A/O (anoxic/oxic) biochemical tank, controlling the reflux ratio of nitrifying liquid to be 200-300% according to the content of ammonia nitrogen in effluent, and performing enhanced denitrification treatment;
(3) the effluent treated by the A/O biochemical tank enters an MBR tank, and the effluent after biochemical treatment in the MBR tank and MBR membrane filtration is pumped to an intermediate water tank by an effluent self-priming pump under negative pressure;
(4) the waste water in middle pond is promoted to the ultrafiltration system by the high-pressure pump, and the ultrafiltration goes out the water and gets into one-level RO system, and the dense water of one-level RO system gets into tertiary RO system, and the fresh water gets into second grade RO system, and the dense water of second grade RO system returns one-level RO system and handles, and the fresh water of tertiary RO gets into second grade RO system, and the dense water of tertiary RO is handled as danger waste, and the fresh water after the second grade RO system is handled is retrieval and utilization behind the ultraviolet disinfection.
2. The method of claim 1, wherein: in step (2), the reaction zone of the air floatation tank is divided into three lattices, the reaction zone is lifted by a wastewater lift pump of a collecting tank to enter a first lattice, industrial liquid caustic soda is added to control the pH value to be 8-9, the water discharged from the first lattice enters a second lattice, a flocculating agent PAC is added into the second lattice, the water discharged from the second lattice enters a third lattice, anion high molecular weight PAM is added into the third lattice to enhance the coagulation effect, the discharged water enters an air floatation zone after reaction, suspended matters and oil are removed from the upper part through air floatation reaction, particles are settled from the lower part, and clear water in the middle part enters an A/O system.
3. The method of claim 1, wherein: and (3) controlling the reflux ratio of the nitrifying liquid in the A/O treatment system in the step (2) to be 200-300%.
4. The method of claim 1, wherein: and (4) controlling the sludge reflux ratio of the MBR tank in the step (3) to be 50-150%.
5. The method of claim 1, wherein: in the step (3), the MBR membrane in the MBR treatment system adopts an immersed flat plate membrane, and the membrane flux is 0.2-0.3 m3/m2.d。
6. The method of claim 1, wherein: the COD of the inlet water of the whole system is not more than 5000mg/L, and the salt concentration is not more than 6000 mg/L.
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| CN202011132706.5A CN112174441A (en) | 2020-10-21 | 2020-10-21 | System and method for treating and recycling machining wastewater by using air flotation pretreatment, biochemistry and double-membrane method |
| PCT/CN2020/134584 WO2022082955A1 (en) | 2020-10-21 | 2020-12-08 | System and method for utilizing air flotation pretreatment + biochemical + double-membrane processes for treating and reusing machining wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526804A (en) * | 2021-08-19 | 2021-10-22 | 榆林学院 | Heparin sodium wastewater treatment process |
| CN113772881A (en) * | 2021-08-28 | 2021-12-10 | 北京百灵天地环保科技股份有限公司 | Oxidation treatment method of phenol-cyanogen wastewater |
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| CN115594366A (en) * | 2022-11-25 | 2023-01-13 | 山东中科恒源环境工程有限公司（Cn） | Printing and dyeing wastewater treatment and reuse system |
| CN116425364A (en) * | 2023-05-15 | 2023-07-14 | 山东凤鸣桓宇环保有限公司 | Oily wastewater recovery treatment system |
| CN117756318A (en) * | 2023-12-08 | 2024-03-26 | 上海汲隆水务科技有限公司 | Nitrogen removal process for sludge wastewater in through ditch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113526804A (en) * | 2021-08-19 | 2021-10-22 | 榆林学院 | Heparin sodium wastewater treatment process |
| CN113772881A (en) * | 2021-08-28 | 2021-12-10 | 北京百灵天地环保科技股份有限公司 | Oxidation treatment method of phenol-cyanogen wastewater |
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| WO2022082955A1 (en) | 2022-04-28 |
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