54 mu. The second phase of Xining No.5 Sewage Treatment Plant is located in Shuangsubao Village, Shilipu Town, Chengbei District, on the east bank of Beichuan River and the east side of Beihai Park, with a land area of about 51 mu and a construction scale of 31,111 tons of municipal domestic sewage per day. The effluent quality meets the first-class A emission standard in the National Pollutant Discharge Standard for Urban Sewage Treatment Plants.