Key Caboratory of Chinese Ministry of Education of northwest Water Resource and Environmental ecolog School of environmental and Municipal Engineering 声建墨群骨 xi'an University of Architecture and Technology Plain settling for 2 hours -TN 口 Raw sewage An average TN removal of 12% ettling, equivalent to 59% of th nded TN Sampling Number Plain settling for 2 hours- TP 12.0 An average TP 口 Settled pla equivalent to 28% of the suspended TPKey Laboratory of Chinese Ministry of Education of Northwest Water Resource and Environmental Ecology School of Environmental and Municipal Engineering Xi’an University of Architecture and Technology