Analysis of gases discharging from inspection wells of urban drainage system and its impacts on the surrounding air quality

2012 International Symposium on Geomatics for Integrated Water Resource Management Pub Date : 2012-11-12 DOI:10.1109/GIWRM.2012.6349567

Ya-e Wang, Jun-qing Ji, Jie Li, Peng Wang, Dongyang Wei

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Abstract

A community drainage system in arid area of northwest China was investigated, of which A# representing inspection well with catchment and without water drop, B# representing inspection well without catchment and water drop and C# representing inspection well with catchment and water drop. Through monitoring the pollutants concentration of different heights from water surface in inspection wells, from the blowhole of inspection wells and the pollutants concentration in the air near inspection wells, the impacts of gases emission from urban drainage system on the surrounding air quality was evaluated. The results showed that the level of hydrogen sulfide(H2S) and carbon dioxide (CO2) was much higher than that of ammonia(NH3)and methane(CH4) in inspection wells. Inspection well type and rainwater catchment also had a great influence on pollutants concentration. Through analyzing the air pollutants concentration near inspection wells, we found that the waste gases generated from urban drainage systems had a neglectable contribution to urban environmental air pollution.

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城市排水系统检测井排放气体及其对周边空气质量的影响分析

以西北干旱区某社区排水系统为研究对象，其中，a#为带集水不带水滴的考察井，b#为不带集水不带水滴的考察井，c#为带集水带水滴的考察井。通过监测检测井水面不同高度的污染物浓度、检测井气孔和检测井附近空气中的污染物浓度，评价城市排水系统排放气体对周边空气质量的影响。结果表明，检查井中硫化氢(H2S)和二氧化碳(CO2)含量远高于氨(NH3)和甲烷(CH4)含量。检查井类型和雨水集水区对污染物浓度也有很大影响。通过对检测井附近大气污染物浓度的分析，我们发现城市排水系统产生的废气对城市环境大气污染的贡献可以忽略不计。

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2012 International Symposium on Geomatics for Integrated Water Resource Management

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