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 Nitrogen in domestic Ammonia and nitrate wastewater Total Nitrogen 135791113151719212325 Sampling number Sampling NuKey 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 Nitrogen in domestic Nitrogen in domestic wastewater wastewater