WANGZhou-feng,ZHANGYan-jing,SHENHui-ling,et al.Temporal and Spatial Distribution Characteristics of Carbon Emissions from Urban Domestic Sewage in Chongqing[J].China Water & Wastewater,2024,40(13):102-108.
Temporal and Spatial Distribution Characteristics of Carbon Emissions from Urban Domestic Sewage in Chongqing
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第13期
Page:
102-108
Column:
Date of publication:
2024-07-01
- Keywords:
- domestic sewage; carbon emissions; septic tank; temporal and spatial distribution characteristic; Fick’s diffusion law
- Abstract:
- The carbon emissions resulting from the biochemical digestion of domestic sewage in septic tanks require greater attention. The concept of the “first” biochemical digestion of domestic sewage was introduced, with Chongqing City, a key town in western China, selected as the research area. By utilizing 3 389 gas sensing devices, Fick’s diffusion law was employed to calculate the “first” carbon emissions from 2019 to 2021. This study obtained the temporal and spatial distribution characteristics of carbon emissions from the “first” biochemical digestion of domestic sewage in the main urban area of Chongqing. The carbon emissions of domestic sewage (in terms of carbon dioxide equivalent) from 2019 to 2021 were approximately 4.443×108 kg, 4.554×108 kg and 2.730×108 kg, respectively. It was worth noting that more than 99% of the methane in each district and county escaped into the external space. The organic combination of the prohibition of septic tanks and urban carbon emission reduction work， and the construction of sewage treatment plants necessitated the full exploitation of various values of urban domestic sewage and methane generated by biochemical digestion. These measures represented inevitable trends, providing new ideas and impetus for the gradual elimination of septic tanks in future. From 2019 to 2021, the high-carbon emission areas of the “first” biochemical digestion of domestic sewage were predominantly located in the western and southern regions of the main urban area, as well as in the central area. Conversely, there was a decrease in low carbon emission areas, an increase in medium carbon emission areas, and a reduction in spatial distribution disparity of carbon emissions. The climate exerted a significant influence on the carbon emissions resulting from the “first” biochemical digestion of domestic sewage. Over the period from 2019 to 2021, there was an observable fluctuation in carbon emissions, following a pattern of high-low-high-low distribution corresponding to the four seasons of winter, spring, summer, and autumn.
Last Update:
2024-07-01