国家水体污染控制与治理科技重大专项No.2009ZX07209-001;国家自然科学基金No.40971258,41271495;高等学校博士学科点专项科研基金No.20121108110006Supported by the National Major Science and Technology Program for Water Pollution Control and RemediationNo.2009ZX07209-001,the National Natural Science Foundation of ChinaNo.40971258,41271495 and the Specialized Research Fund for the Doctoral Program of Higher EducationNo.20121108110006