Convenient-integrated paint spray wastewater treatment and reuse system and method

Abstract

The invention discloses a convenient-integrated paint spray wastewater treatment and reuse system and method. Sewage is sequentially treated by the following equipment: a wastewater collection and regulation tank for sewage storage and water quality stabilization, a neutralization and coagulation sedimentation device which is connected with a dosing device, a buffer tank for storing supernate treated by the neutralization and coagulation sedimentation device, and a mechanical filter, wherein precipitate is dewatered and dried by a plate and frame filter press, and the supernate is stored in aclear water tank after filtering. The system and method meet the reuse water standard in the production link of enterprises.

Description

technical field [0001] The application relates to sewage treatment, in particular to a convenient and integrated paint spraying wastewater treatment and reuse system and method. Background technique [0002] Due to the dissolution or suspension of a large amount of paint mist in the spray painting wastewater, the concentration of organic pollutants in the sewage is high, the sewage is weakly acidic, and the general pH range is 5.0-7.0; the level of COD depends on the circulating water of the spraying water curtain and the waste gas spraying circulating water. Use and replacement cycle, the longer the cycle, the greater the concentration, normally 2000 mg / , high up to 10000 mg / , SS range is generally 600-1000mg / L, chroma is generally around 70, high concentration circulating water The traditional biochemical process is difficult to meet the standards of taking over or "Water Quality Standards for Sewage Discharge into Urban Sewers" due to unstable operation. [0003] Defects...

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Problems solved by technology

[0002] Due to the dissolution or suspension of a large amount of paint mist in the spray painting wastewater, the concentration of organic pollutants in the sewage is high, the sewage is weakly acidic, and the general pH range is 5.0-7.0; the level of COD depends on the circulating water of the spraying water curtain and the waste gas spraying circulating water. Use and replacement cycle, the longer the cycle, the greater the concentration, normally 2000 mg / , high up to 10000 mg / , SS range is generally 600-1000mg / L, chroma is generally around 70, high concentration circulating water The use of traditional biochemical processes is difficult to meet the standards of taking over or "Water Quality Standards for Sewage Discharge into Urban Sewers" due to unstable operation

[0003] Defects in the existing treatment technology: 1. The waste water produced by the enterprise's spray painting room (water curtain circulating water in the spray painting room + circulating water in the waste gas spray tower) has high concentration of pollutants and is difficult to treat. The conventional treatment process is complicated and the treatment cost is high. It is very difficult to meet the discharge standards; 2. Due to the intermittent and irregular characteristics of drainage, the combined process of physicochemical + biochemical is adopted, the biochemical effect is unstable, and the treatment efficiency is low; 3. Biochemical needs to build a large number of structures, covering a large area and investing in civil engineering; 4. The effluent in the biochemical system is unstable due to the lack of nutrients when the microorganisms are abnormal. To meet the discharge standards, the membrane filtration process is generally used. When the pretreatment efficiency is low, the membrane fouling is serious, the membrane consumption is high, and the operating cost is high; 5. Traditional flocculation agents Due to the large amount of dosage, the amount of mud and slag produced by the process is large, and the cost of hazardous waste treatment is high because the waste slag contains paint residue; Spray water forms secondary pollution

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