Papers by Author: Qi Feng Liu

Abstract: Due to the presence of complicated and considerable amounts of toxic compounds such as phenolic compounds, thiocyanate and ammonium, coal gasification wastewater (CGW) would cause a serious environmental problem. Conventional treatment of CGW includes a series of biological treatment (mostly anoxic-aerobic process and activated sludge process) after a physico-chemical pretreatment to reduce the concentrations of phenols and ammonium. Although quite effective, these processes are still not enough to meet the strict requirements of the National Discharge Standard of China. To find more efficient way to treat CGW, a serious of hybrid processes were reviewed in this study. Through this review we found that A²O combined with MBR (anaerobic-anoxic-aerobic membrane reactor) can effectively remove COD, total organic carbon, NH₄⁺ -N, total phenols and total nitrogen (TN).

Abstract: The sustainable flux in dead-end mode of MF membrane filtration was confirmed in this study. Analytic results show that when flux above which an irreversible deposit (fouling) appears. The sustainable flux is dependent on the hydrodynamics and system properties (pH, ionic strength, membrane characteristics, particle characteristics, etc) and position along the membrane. Below the sustainable flux, tiny fouling is observed. In addition, the optimal pre-coagulation condition was found based on the maximum turbidity and organic remove rate.