Legal Basis: "Discharge Standards for Water Pollutants in Medical Institutions GB18466-2016" 3. Comprehensive medical institutions with 20 beds or more at the county level and above the county level or Medical institutions and other medical institutions sewage discharge to implement the provisions of Table 2. Sewage discharged directly or indirectly into surface water bodies and sea areas is subject to the discharge standards, and sewage discharged into sewers whose terminals have been constructed with normal operation of secondary sewage treatment plants in cities and towns is subject to the pre-treatment standards.4. Sewage from comprehensive medical institutions and all other medical institutions below the county level or with fewer than 20 beds is discharged after disinfection.5. It is forbidden to discharge sewage into the drinking water protection zones of GB38381, category 1 and category 2 waters, GB3097 a and swimming areas, GB3097 b and c, and GB3097 c and d, and GB3097 d and e. and swimming areas, and GB3097 Class I and Class II waters are prohibited from directly discharging sewage from medical institutions. 6. Comprehensive medical institutions with infectious disease rooms shall separate sewage from infectious disease rooms from sewage from non-infectious disease rooms. Infectious room sewage, feces after disinfection before combined with other sewage treatment.7, the use of chlorine disinfectant disinfection of medical institutions, if directly discharged into surface waters and marine areas, should be deoxygenated, so that the total residual chlorine is less than 0.5 mg / L.