FANBo,HUANGPeng,SUNYong-li,et al.Characteristics of Urban Water Bodies Pollution Following Rainfall and Strategies for Rapid Purification of Rainfall Pollution[J].China Water & Wastewater,2024,40(13):115-121.
Characteristics of Urban Water Bodies Pollution Following Rainfall and Strategies for Rapid Purification of Rainfall Pollution
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第13期
Page:
115-121
Column:
Date of publication:
2024-07-01
- Keywords:
- rainfall pollution; urban water body; re-formation of black and odorous water body; pipeline sediment; rapid purification
- Abstract:
- The deposition of particulates in urban drainage pipes is particularly severe during the dry season in China. The sediment is then flowed into the water body due to rainwater erosion during rainfall, which is the primary cause for re-formation of black and odorous urban water bodies. During the process of rainfall, the water quality and pollution characteristics of urban water bodies were analyzed through tracking monitoring the urban river channels and outlets. It was observed that the dissolved oxygen (DO) and oxidation-reduction potential (ORP) of river channels reached severe black and odorous degree after rain. The three-dimensional fluorescence spectra revealed that the organic substances in the rainwater pollution were predominantly aromatic protein compounds and microbial metabolites, originating mainly from domestic sewage and microorganisms deposited in pipes. The experiment on sedimentation of outlet flow indicated that the rainfall pollution in the rainwater outlet was characterized by high suspended solids and easy sedimentation. The sedimentation process could be divided into three stages. Within the first 5 minutes, the removal rates of SS, COD, TP, and TN reached 69.01%, 32.54%, 45.54% and 28.55%, respectively. However, there was no significant change in dissolved pollutants such as NH4+-N and PO43--P. Based on the aforementioned characteristics, rapid purification scheme of rainfall pollution should focus on the removal of particulate matters as the core, while also meeting requirements for short hydraulic retention time, high treatment efficiency, intermittent operation, and fast start-up.
Last Update:
2024-07-01