Discussion on Prevention and Control Scheme of Overflow Pollution from Combined Drainage System of Nanming River Basin in Guiyang
In order to avoid river pollution caused by direct discharge of domestic sewage,Guiyang city has taken a number of measures to control water environment pollution.At present,the Nanming River sewage intercepting ditch basically does not overflow in the dry season,but the risk of overflow pollution still exists in the rainy season.Based on the analysis of the rainfall characteristics of Guiyang city,by the principle of"basin coordination and systematic governance",the idea of"source reduction(sponge city)+pipe canal control(precise flow restriction at outlet of drainage ditch)+storage and regulation process"combined sewer overflow pollution control is put forward.This paper discusses the layout of storage and regulation facilities along the Nanming River and the capacity linkage treatment mode of downstream sewage plants,that is,based on the goal of"no overflow of light rain in Nanming River(rainfall≤5 mm)",6 storage tanks were laid out in accordance with the principles of"intensive land use and decentralized layout",and the linked sewage treatment plant increased its capacity by 10%of the design value,after the storage tanks were full during rainfall,they were emptied within 3 days,the rainwater and sewage mixed water of the storage pond will be transported to the linkage sewage treatment plant along the Nanming River for treatment and discharge up to the standard.The aim is to provide a solution to the combined sewer overflow pollution of the main confluence system in the Nanming River basin.
Nanming River in Guiyang cityrainfall characteristicscombined system overflow pollution preventionpipe canal controlstorage and regulation process
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