MVR technology-based machining emulsified wastewater treatment method

Abstract

The invention relates to an MVR technology-based machining emulsified wastewater treatment method. The method comprises the following steps: realizing oil-water separation of emulsified wastewater by adopting an MVR technology, allowing condensed water generated after evaporation to enter an equalizing tank, and carrying out biochemical treatment; adding supplemented nutrients needed by subsequent biological treatment to the equalizing tank in order to realize subsequent biological treatment; carrying out hydrolysis acidifying treatment on wastewater to convert non-biodegradable organic matters in the wastewater into soluble organic matters, carrying out aerobic decomposition on the organic matters in the wastewater, and discharging outlet water to a next treatment technology; discharging water discharged from a contact aerobic tank to a secondary sedimentation tank in order to carry out mud-water separation; and filtering water separated through the secondary sedimentation tank to remove residual suspensions in water. The method has the advantages of simple process flow, stable control of the biochemical treatment impact load, guaranteeing of standard reaching of treatment outlet water, and solving of the secondary treatment problem of concentrate and ultrafiltration concentrate in traditional technologies.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for machining emulsified wastewater based on MVR technology. Background technique [0002] The discharge of high-concentration emulsified wastewater produced in the production process of the automobile industry is generally relatively small, and the discharge of other wastewater is also very small, mainly domestic sewage. For this kind of wastewater, the treatment process generally adopted is pretreatment (inorganic ceramic membrane ultrafiltration or coagulation air flotation / sedimentation) + micro-electrolysis + biochemistry + deep oxidation (Fenton oxidation or ozone oxidation, etc.) process, many automobile companies, Such as Dongfeng Honda, Dongfeng Nissan, FAW-Volkswagen, Shanghai Volkswagen, etc. have adopted this process. However there are following problems: [0003] ①The emulsion waste liquid directly passes through the ultrafiltration ...

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Problems solved by technology

[0003] ①The emulsion waste liquid directly passes through the ultrafiltration membrane, which makes the cleaning workload larger and the cleaning process complicated;

[0004] ②Once the ultrafiltration membrane is clogged and fails, it will bring great impact to the subsequent biochemical treatment. In order to ensure stable water output, a large number of safeguard measures must be added, such as micro-electrolysis, Fenton oxidation, etc., and these processes are harmful to acid and alkali. , Ferrous sulfate, hydrogen peroxide and other chemicals are used in large quantities, and there are operational safety problems at the same time;

[0005] ③ The overall process is long, the automation control is complicated, and the workload of operation and maintenance is large;

[0006] ④Ultrafiltration produces a large amount of concentrated liquid with insufficient concentration, while coagulation and air flotation (or sedimentation) will produce a large amount of sludge, and there is a problem of secondary treatment

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