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- Title
广东小城镇雨水径流污染特征及其藻毒性解析.
- Authors
卢嘉欣; 范中亚; 罗千里; 江颖; 范珊珊; 林树锋; 刘安
- Abstract
Stormwater runoff is one of the primary pollutant sources of urban receiving waters. Although there are a number of stormwater runoff studies focusing on big cities, it is extremely limited on small towns which are characterized by a large number, big areas, dense population and poor sanitation. In addition, conventional approaches to indicating stormwater quality are to use single pollutant’ concentrations/loads. However, this approach cannot represent the integrated effects all pollutants have and hence is incapable of comprehensively indicating stormwater quality. This study selected a typical small town, located at Shantou, Guangdong and explored its stormwater quality characteristics from different surfaces (arterial roads, secondary roads, residential roads, school roads and roofs) using both concentrations and toxicity (indicating the integrated effects all pollutants have). The research outcomes showed that the event mean concentrations of chemical oxygen demand, total nitrogen, ammonia nitrogen, total phosphorus, and suspended solids were 8~491、0.09~17.33、0.05~9.62、0.02~0.83 and 3~3 090 mg/L, respectively. The stormwater runoff from arterial roads and secondary roads were primarily polluted by heavy metals while residential roads’runoff contained higher concentrations of nitrogen and phosphorus. Stormwater runoff from school roads and roofs were less polluted. In terms of toxicity tested by Chlorella pyrenoidosa, stormwater runoff from arterial roads, secondary roads and residential roads inhibited the algae cell growth and chlorophyll a synthesis, leading to high amounts of intracellular catalase while stormwater runoff from school roads and roofs did not show significant toxicity to the algae. The research can provide useful insight on small towns’stormwater pollution mitigation as well as ecological health risk control of receiving waters.
- Subjects
RUNOFF; CHLORELLA pyrenoidosa; CHEMICAL oxygen demand; ENVIRONMENTAL health; SUSPENDED solids; PHOSPHORUS in water
- Publication
Environmental Science & Technology (10036504), 2022, Vol 45, Issue 4, p69
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.2386.21.338