Biological approaches for disposing and reusing chemical wastewater

Abstract

A serial study on the integrated disposal and utilization of chemical industrial wastewater containing high levels of organic compounds, mercury, nutrients and chlorides was carried out with biological approaches in Hangu region, Tianjin city, China. Results indicated that the quality of wastewater could be improved by a biological stabilization pond system under appropriate load of organic matter and well operation. The effluent from this stabilization pond could not be used for irrigation due to high salinity, but it may be used for fish culture. Because of high levels of mercury, the fish living in this effluent could not be used as food for both humans and breeding sables ( Martes zibellina L.) whereas it could be served as a part of diet for growing sables. Results demonstrated that this chemical wastewater could be controlled and reused through ecological techniques combined with environmental engineering approaches. This system could improve environmental quality and enhance economic.