市政排水管道CH4产排及其影响因子研究综述

A research overview on production,emission and influencing factors of methane in municipal drainage pipeline

介绍了市政排水管道CH4排放监测现状,阐述了排水管道CH4的产排机制与产排源,分析了管道CH4产排机制中需要明确的问题。分析认为:排水管网是CH4排放的重要来源,我国排水系统的CH4排放负荷存在较大区域差异;CH4排放的差异性与管道系统结构有关,沉积物及管壁生物膜是管道中有机物发酵及产CH4的重要场所;管道体制及内部运维状况可造成水文模式、进水污染源和有机碳分配的差异,进而触发实际CH4排量或根本性动态变化及区域不确定性。

The monitoring status of methane(CH4)emissions from municipal drainage pipeline was introduced.The mechanism and sources of CH4 production and emission in drainage pipeline were expounded.Besides,the problems that need to be clarified in the CH4 production and emission mechanism was analyzed.The analysis showed that drainage pipeline was an important source of CH4 emission.CH4 emission load of drainage system showed large regional differences in China which was related to the structure of the pipeline.The biofilm on the pipe wall and sedimerit were the important places for organic fermentation and CH4 production in the drainage pipeline.The pipeline system and internal operation and maintenance situation could cause different hydrological model,influent pollution sources and organic carbon allocation,and then lead to the actual CH4 emission or fundamental dynamic change and regional uncertainty.