Nanning City, the first level of sewage discharge standard requirements

1, sewage discharge standards for primary a (unit: mg / L): pH (dimensionless): 6-9; chemical oxygen demand (CODCr): 50; five-day biochemical oxygen demand (BOD5): 10; suspended solids (SS): 10; ammonia nitrogen: 5 (8); total nitrogen: 15; total phosphorus: 0.5; chromaticity (diluted times): 30; animal and vegetable oils: 1.0; petroleum species: 1.0 Anionic surfactant: 0.5; Fecal coliforms (number/L): 1000; Total mercury: 0.001; Alkylmercury: 1×10^-5; Total cadmium: 0.01; Total chromium: 0.1; Hexavalent chromium: 0.05; Total arsenic: 0.1; Total lead: 0.1; Total nickel: 0.05; Benzo(a)pyrene: 3×10^-5.2. GB18918-2002 "Standard for the discharge of pollutants from urban wastewater treatment plants". Pollutant Emission Standards for Sewage Treatment Plants" level 1 standard **** required indicators 12, of which chemical oxygen demand (COD) and suspended solids (SS), as well as ammonia nitrogen and total phosphorus is a regular focus on controlling pollutant indicators.