A CASE ANALYSIS OF COMPREHENSIVE TREATMENT OF URBAN BLACK-ODOROUS WATER AND KEY POINTS DISCUSSION ON ENGINEERING DESIGN

Pudong river system is a typical urban black-odorous water body in Fuzhou, which has been facing with problems such as serious external pollution, accumulation of internal pollution, lack of instream flow, and ecosystem degradation. According to the characteristics of the drainage basin and overall consideration of "water environment, water ecology and water landscape", the technical route of "external pollution control, internal source treatment, improvement of water flow and quality, and ecological restoration" was adopted to solve the problem of Pudong river system. It was estimated that the overflow rate, COD and ammonia nitrogen pollution loads were reduced by 49.9%, 77.0% and 92.2%, respectively. According to the operation data, COD concentration in the Pudong river system was stable under 30 mg/L, and the ammonia nitrogen was stable under 4 mg/L, which showed good treatment results. This paper expounded the design experience and key points in the treatment measures and provided references for the similar urban black-odorous water treatment projects.