Coating wastewater treatment technology

Abstract

The invention relates to a coating wastewater treatment technology. The technology comprises the following steps: raw water enters an equalizing tank; water in the equalizing tank enters a prepositioned filter through an elevator pump and is filtered, and the filtered raw water enters a degassing and carbonizing linkage system, wherein a carbonization membrane module is arranged in the degassing and carbonizing linkage system; water discharged from the carbonization membrane module goes through a reagent adding pool a and undergoes reagent adding, the reagent added water enters a micro-electrolysis system through a pump in order to realize treatment of high-concentration organic wastewater; water discharged from the micro-electrolysis system goes through a reagent adding pool b and undergoes reagent adding, and obtained water enters a coiled tube through a pump b and undergoes a Fenton reaction, wherein reagent adding of the reagent adding pool b is carried out to adjust the pH value and the content of hydrogen peroxide; water obtained after the Fenton reaction goes through a reagent adding pool c and undergoes reagent adding, and obtained water enters a coagulation and precipitation tank and precipitates; a clear liquid at the upper portion of the coagulation and precipitation tank enters a photocatalysis system through a pump c in order to remove organic matters in the clear liquid; and water obtained after photocatalysis is collected by an intermediate water tank, and enters an enhanced filter through a pump d, and filtered water is discharged. The technology has the advantages of reduction of the COD value of coating wastewater, simple process flow and long service life.

Description

Technical field: [0001] The invention relates to the field of waste water treatment technology, and more specifically relates to a paint waste water treatment technology. Background technique: [0002] The main components of paint wastewater discharged by production enterprises are toluene, xylene, dicyclopentadiene, phthalic anhydride, maleic anhydride, butenedioic acid (cis, trans), methylal, acetal, ethanol, dimethyl ether, butylene Esters, hypophosphorous acid, etc., these. It often contains toxic and harmful substances such as phenols, benzenes and heavy metals (surface treatment), and the COD of the water produced by evaporation of paint wastewater is 4000-5000mg / L. pH = 4-12.5 range. Phenol is a chemical co-carcinogen, and if high-concentration phenol-containing wastewater is discharged into waters, aquatic organisms will be damaged. Pigments currently used in the paint industry also contain lead and chromium. Lead is currently the most widely polluting element, a...

AI Technical Summary

Problems solved by technology

However, the process is lengthy, the equipment cannot fully play its role, the treatment cost is high, the discharge stability is poor, and the treatment effect needs to be improved.

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