摘要
乡镇污水治理是污水处理体系的重要组成部分,也是美丽乡村建设的重要内容。“双碳”政策背景下,乡镇污水处理的碳排放日益受到关注。研究以成都市某乡镇污水处理厂为例,核算2023—2024年年度及月度碳排放量(kg CO_(2)-eq)及强度(kg CO_(2)-eq/m^(3))特征。结果表明,该污水处理厂碳排放的主要因素为N_(2)O直接碳排放和物耗间接碳排放,次要因素为电耗间接碳排放。该污水处理厂进水水质水量不稳定,碳排放强度受季节影响明显。N_(2)O碳排放在直接碳排放强度中占比最大,达87.80%。进水碳氮比和间接碳排放强度呈负相关,2024年整体碳氮比上升,乙酸钠碳排放强度降幅为0.033 kg CO_(2)-eq/m^(3)。该污水处理厂所在区域电力碳排放因子较低,能耗间接碳排放强度(0.12kg CO_(2)-eq/m^(3))低于国内其他研究水平。采用Spearman相关分析,碳排放强度和进水TN(P<0.01)、吨水电耗(P<0.01)呈显著正相关,而和出水TP(P<0.01)呈显著负相关。结合该污水处理厂碳排放特征,提出了统筹低碳规划、加强管网运营维护、优化运行调控、强化资源回收利用等减排路径,以期为乡镇污水处理系统减污降碳提供参考。
Sewage treatment in a township is an important component of the sewage treatment system and an important part of the construction of beautiful rural areas.Under the background of the“Carbon Peaking and Carbon Neutralization”policy,the carbon emissions from rural sewage treatment are increasingly receiving attention.A sewage treatment plant in a township in Chengdu City was taken as an example in this analysis to calculate the annual and monthly carbon emissions(kg CO_(2)-eq)and intensity(kg CO_(2)-eq/m^(3))from 2023 to 2024.The results indicated that the main factors contributing to carbon emissions from the sewage treatment plant were direct N_(2)O carbon emissions and indirect carbon emissions from material consumption,while the secondary factor was indirect carbon emissions from electricity consumption.The incoming water quality and quantity of the factory were unstable,and the carbon emission intensity was significantly affected by the season.N_(2)O carbon emissions accounted for the largest proportion of direct carbon emission intensity,accounting for 87.80%.There was a negative correlation between the inflow carbon nitrogen ratio and indirect carbon emission intensity.In 2024,the overall carbon nitrogen ratio increased,while the carbon emission intensity of sodium acetate decreased by 0.033 kg CO_(2)-eq/m^(3).The power carbon emission factor of the area where the sewage treatment plant was located was relatively low,and the indirect carbon emission intensity of energy consumption(0.12 kg CO_(2)-eq/m^(3))was lower than other domestic research levels.Using Spearman correlation analysis,carbon emission intensity was significantly positively correlated with influent TN(P<0.01)and electricity consumption per ton of water(P<0.01),while significantly negatively correlated with effluent TP(P<0.01).Based on the carbon emission characteristics of the sewage treatment plant,emission reduction paths such as overall low-carbon planning,strengthening pipeline operation and maintenance,optimizing operation and regulation,and enhancing resource recycling and utilization have been proposed to provide reference for reducing pollution and carbon emissions in township sewage treatment systems.
作者
任纯基
张茗
高云
赵林强
宋一
REN Chunji;ZHANG Ming;GAO Yun;ZHAO Linqiang;SONG Yi(Chengdu Shuangliu Yunhang Water Service Co.,Ltd.,Chengdu,Sichuan 610200,China;Chengdu Airport Environmental Investment Co.,Ltd.,Chengdu,Sichuan 610200,China)
出处
《四川环境》
2025年第6期130-142,共13页
Sichuan Environment
关键词
乡镇污水处理厂
直接碳排放
间接碳排放
排放特征
影响因素
Sewage treatment plant in a township
direct carbon emission
indirect carbon emission
emission characteristics
influencing factors
