| Advances of the techniques in dyeing Wastewater treatment in recent years lies mainly in two aspects: improvement of biological processes, and development of new wastewater treatment chemicals. This paper presents the achievements during the Seventh Five-year Plan, most of which have already been tested by pilot experiments, and some of them have already had history of practical application. These include anaerobic aerobic bio-treacmentsystems, bio-feirous system, selection and application of fine varieties of decolouring bacteria and PVA degradation bacteria, new types of efficient coagulants, high voltage pulse electrolysis processes. All the techniques mentioned avove, when applied to dyeing wastewater treatment, high treatment efficiecy can be acquired: CODcr reduced by 70-90%, and colourity reduced by more than70%. |
