Tests on Printing and Dyeing Wastewater Treatment Technique

This paper describes the research of the treatment processes for a kind of printing and dyeing wastewater. Three treatment techniques were applied in this research: hydrolysis acidification, biological contact and acidification-biological technique. Results showed that hydrolysis acidification-biological contact oxidation treatment was a more effective process. By controlling the optimal conditions strictly, removing rates of CODcr and chroma were up to 84% and 88% after being treated for 24 hours for the wastewater (CODcr:532 mg/L,chroma: 512). Also, the technique suited well to the pH of the wastewater.