Application for printing and dyeing wastewater pretreatment process

Abstract

The invention discloses a printing and dyeing wastewater pretreatment process. The printing and dyeing wastewater pretreatment process comprises the following concrete steps: S1, carrying out a flocculation reaction in a flocculation device; S2, allowing the wastewater to enter a horizontal flow sedimentation pool, allowing a supernatant to flow into an overflow water collection tank, and allowingsludge to be scraped into a sludge hopper; S3, carrying out oxidation treatment in an ozone oxidation pool; and S4, carrying out biochemical treatment in an A / 0 pool. The invention relates to the technical field of wastewater treatment. Through application of the printing and dyeing wastewater pretreatment process, the water inlet load of a biochemical section can be reduced; through ozone oxidation pretreatment of printing and dyeing wastewater, macromolecular refractory organic dyes can be oxidized and decomposed into micromolecular pollutants which are easy to be biologically treated; meanwhile, the required concentration of ozone is low; the wastewater subjected to ozone oxidation pretreatment contains dissolved oxygen, so pre-oxygenation of subsequent biochemical treatment can be realized; the aeration rate of a subsequent biochemical section is reduced; energy consumption is reduced; the biodegradability of the wastewater can be improved; and the influences of large occupied area of a pool body and foul smell pollution caused by anaerobic sludge in a traditional anaerobic hydrolysis pretreatment process are avoided.

Description

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to an alkaline chemical flocculation precipitation + ozone oxidation pretreatment process for printing and dyeing wastewater. Background technique

[0002] Textile printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, high alkalinity, and large changes in water quality. It is one of the most difficult industrial wastewater to treat. Impurities, sand substances, inorganic salts, etc., the main methods used for the treatment of printing and dyeing wastewater include physical and chemical methods, biochemical methods, chemical methods, and a combination of several processes. The pretreatment in wastewater treatment is mainly to improve the quality of wastewater. Remove suspended solids and impurities that can be directly settled, adjust the quality and quantity of wastewater, reduce the temperature of wastewater, ...

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