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 Evaluation parameters COD BOD Nitrogen NH-N NOx-N(NO3-N, NO2-N) Organic and inorganic nitrogen v KN=Organic nitrogen NH-N Y Inorganic nitrogen=TN-Organic nitrogen > 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 Evaluation Parameters Evaluation Parameters ¾ COD ¾ BOD ¾ Nitrogen Nitrogen • NH3-N • NOx-N (NO3-N, NO2-N) • Organic and inorganic nitrogen Organic and inorganic nitrogen 9 KN=Organic nitrogen + NH3-N 9 Inorganic nitrogen = TN – Organic nitrogen ¾ TP