Integrated printing and dyeing waste water treatment process

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.