HAOXiao-di,ZHANGYi-ning,LIJi,et al.Evaluating Methane Emission Models of Sewers and Analyzing Inherent Control[J].China Water & Wastewater,2023,39(17):1-9.
Evaluating Methane Emission Models of Sewers and Analyzing Inherent Control
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
1-9
Column:
Date of publication:
2023-09-01
- Keywords:
- sewer; methane; emission model; wastewater temperature; COD concentration; vacuum sewer system
- Abstract:
- Methane emission from sewers is almost close to indirect carbon emission from energy consumption of wastewater treatment, so that its greenhouse effect should not be underestimated. Some models describing methane production and emission in sewers are first analyzed and summarized, which clarifies the differences and application scopes of these models. Based on the orthogonal tests, the significant degree of key factors on affecting methane production is fully analyzed for the predicting models. The calculated results reveal that temperature has the most significant influence on methane production; lowering temperature by exchanging heat online is feasible but not desirable as this action would inevitably affect biological wastewater treatment during the winter time. The COD concentration and sewers’ diameter are the second to affecting methane production, but it seems as if hands be tied because of objective conditions. On balance, reducing the flowing time of wastewater in sewers might be the only approach to avoiding methane production. In this aspect, vacuum sewer system (VSS) seems a technical solution, but it is essential to balance the indirect CO2 emission of energy consumption caused by VSS and direct CH4 emission from sewers. Besides, such external intervention measures as adding chemicals into sewers could inhibit the activity of methanogens to an extent, but maintenance costs and indirect carbon emissions have to be considered.
Last Update:
2023-09-01