Automobile manufacturer wastewater treatment method

Abstract

The invention relates to a method for treating wastewater and discloses a method for treating wastewater in an automobile manufacturing plant. A method of pretreatment, two-stage physicochemical treatment, biochemical treatment and advanced treatment is adopted to treat wastewater. The method for treating wastewater in the automobile manufacturing plant has little investment, small occupied area and low operating cost and has good integrated treatment effect on industrial wastewater and domestic sewage discharged from the automobile manufacturing plant.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a comprehensive treatment method for various wastewater discharged from automobile manufacturing plants. Background technique [0002] The production process of the automobile industry mainly includes machining, forming, welding, surface treatment, painting, assembly and other processes, among which surface treatment and painting are the main processes for discharging wastewater. Wastewater mainly contains surfactants, oils, phosphates, metal salts, organic solvents and other substances discharged from surface treatment and coating processes, as well as high-concentration emulsions discharged from machining. [0003] At present, the treatment methods of automobile industry wastewater mainly include biochemical treatment, physicochemical treatment and membrane separation. Due to the variety of waste water, high concentration of pollutants, and poor biodegradability of some waste w...

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Problems solved by technology

[0004] 1. Most automobile production plants separate the waste liquid and waste water discharged from machining and the waste liquid and waste water discharged from the painting workshop into two waste water stations for treatment, and adopt two sets of treatment processes, resulting in huge investment, many repeated constructions, and low utilization rate of equipment

[0005] 2. Part of the treatment process adopts secondary physical and chemical treatment or biochemical treatment measures in the pretreatment stage. The treatment process is complicated and the treatment cost is high

[0006] 3. Part of the treatment process does not separate the wastewater according to the water quality in the pretreatment stage or in the whole treatment process (using the combined process)

Whether it is chemical coagulation or activated carbon adsorption, the removal efficiency of dissolved organic matter in wastewater is low, and it is easy to cause the effluent COD to fail to meet the standard, and the adsorption capacity of activated carbon is limited, and the regeneration cost is high.

[0009] 6. Although some treatment processes adopt biochemical treatment process after physical and chemical treatment, the biochemical treatment process adopts activated sludge method, which is prone to sludge swelling and other phenomena, resulting in deterioration of effluent quality and difficulty in system recovery

[0010] 7. Most of the treatment processes cannot reuse the effluent after wastewater treatment, resulting in a waste of resources

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