Environmental Science Part 2:Water Resources and Treatment Topic 3:Water and wastewater treatment Prof.LI Fengting UNEP-TONGJI Institute of Environment for Sustainable Development College of Environmental Science and Engineering Tongji University Environmental Science Part 2: Water Resources and Treatment Topic 3: Water and wastewater treatment Prof. LI Fengting UNEP-TONGJI Institute of Environment for Sustainable Development College of Environmental Science and Engineering Tongji University