Integrated printing and dyeing waste water treatment process

Abstract

This invention relates to a comprehensive process for treating dye waste-water comprising: pretreatment, biochemical treatment and wastesludge treatment. In the pretreatment, high efficiency water quality modulation agent is used for the reactions of: complexation with the organic substances, hydration, hydrolyzation and neutralization to reduce the content of soluble substances being of difficult to be degradation lowering alkalinity, reducing heavy metal ions. After that it is subjected to anaerobic treatment, where the devulcanization makes the decolourization of the dye and reducing COD content, the ion of Fe2+ reacts with S2-(the devulcanization product) to produce non-soluble sulfides. The residual of modulation agent in coordination with aerobic microganism proceed further biological reaction to increase the biochemical treatment effect. The effluent after thus treatment can be direct drained, meeting the national standards.

Description

technical field The invention relates to a treatment process of printing and dyeing wastewater, in particular to a comprehensive printing and dyeing wastewater treatment process integrating water quality conditioning, acidification hydrolysis, and intelligent oxygen supply and aeration. technical background With the development of urbanization and industrialization, the problem of water pollution has become increasingly prominent. Among them, printing and dyeing wastewater is one of the main industrial wastewater in my country. It has the characteristics of large water volume, high chroma, and complex composition, causing serious pollution to the environment. At present, the treatment methods of printing and dyeing wastewater mainly include chemical coagulation, biochemical treatment and physical treatment. The chemical coagulation method uses coagulants mainly composed of magnesium salts and iron salts. Cause secondary pollution; biochemical treatment is currently the main ...

AI Technical Summary

Problems solved by technology

This combined biochemical treatment and physicochemical treatment wastewater treatment process can basically meet the standard of water quality COD and chroma after treatment, but the treatment process is more complicated, the treatment efficiency is reduced, and it is difficult to meet the needs of the design capacity, and because the biochemical treatment before The sewage water quality is not regulated, which makes the biochemical treatment susceptible to impact. In the process of biochemical treatment and physicochemical treatment, the consumption of chemicals and electric energy is high, which increases the unit treatment cost. Therefore, how to increase the efficiency of the existing sewage treatment process, Consumption reduction is a common problem faced by sewage treatment at present

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