Education:  Ph.D., Nanjing Agricultural University; Waste Management,1995  MSc, Nanjing Agricultural University, Waste Management,1990  B.A., Hunan Agricultural University; Soil Science and Plant Nutrition, 1985 Research interests and expertise:  Disposal and reutilization of organic solid wastes such as sewage sludge, restaurant food waste, and animal waste.  Sludge bioleaching for heavy metal removal and advanced dewatering and bioleached sludge composting in commercial scale.  Purification of organic wastewater of high concentration of COD, NH3-N, and SS by the combined biological and chemical approaches. These wastewaters include anaerobically digested livestock slurry and refuse leachate.  Treatment of acid mine drainage (AMD) and recovery of valuable metal from AMD by biomineralization.  The role of biogenic Fe-base minerals in advanced oxidation process of organic pollutant and in the removal of As in groundwater.  Soil contamination and remediation