Study of outdoor rainwater drainage pollution in a hospital

Abstract The outdoor rainwater drainage pollution in a large general hospital poses considerable threats to the environment and our health. A systematic analysis method was summarized in the investigation practice. Results showed that the pipe network damage caused by uneven geological settlement was the main reason for the pollution of the rainwater pipe network in the hospital. Countermeasures such as settlement repair and geological foundation reinforcement, rainwater and sewage pipeline transformation, the repair of mixed connection of rainwater and sewage pipes and polluted water sources, drainage health safety in isolated areas, and emergency storage tanks were discussed. After implementing the measures, the NH3-N measured value was within 0.82 mg/L, and the average removal rate was 97.4%. The COD concentration also decreased significantly with an average of 12 mg/L and the average removal rate was 91.8%. The results show that the reconstruction can effectively deal with the problem of outdoor rainwater drainage pollution in the hospital. The study has specific engineering reference significance for medical building drainage system's health and safety research.