摘要
在减污降碳协同增效的背景下,对污水处理厂开展全面、准确的碳排放核算,并提出减污降碳协同的工艺优化方案具有重要的现实意义.本文在团体标准《污水处理厂低碳运行评价技术规范》(T/CAEPI-2022)的基础上,提出了一种更全面的城镇污水处理厂碳排放核算方法,考虑了进水溶解性CH4、污水化石碳、外加碳源以及受纳水体残余污染物引起的碳排放.以浙江省某城镇污水处理厂(8000 m^(3)·d^(-1))为研究对象,利用该方法核算了其直接和间接碳排放,并利用BioWin进行了减污降碳协同工艺优化.结果显示,该厂2022年度总碳排放为2472.49 t CO_(2)eq,比现有标准的核算结果高出9.01%,其中,电耗碳排放占总碳排放的54.55%.利用BioWin软件建立了污水处理厂工艺概化模型,通过敏感性分析确定对模型输出结果影响显著的参数并校正模型.选取影响出水水质和碳排放的5个关键工艺参数:好氧区溶解氧、硝化液回流比、污泥回流比、排泥量、碳源投加量,基于模型进行了减污降碳优化方案设计与模拟.工艺优化后总碳排放降低了17.25%,且出水水质显著提升,预计每年降低成本约299074.70元,经济和环境效益可观.
In the context of synergizing the reduction of pollution and carbon emissions,it is very important practically to conduct comprehensive and accurate carbon emission accounting for sewage treatment plants and to propose process optimization plans for the reduction of pollution and carbon emissions.This article proposes a more thorough carbon emission accounting method for urban wastewater treatment plants based on the group standard"Technical Specification for Low Carbon Operation Evaluation of Wastewater Treatment Plants"(T/CAEPI-2022).This method accounts for carbon emissions caused by dissolved CH4 in influent,fossil carbon in wastewater,external carbon sources,and residual pollutants in receiving water bodies.Taking a wastewater treatment plant(8000 m^(3)·d^(-1))in a certain town in Zhejiang Province as the research object,this method was used to calculate its direct and indirect carbon emissions,and BioWin was used to optimize the collaborative process of the reduction pollution and carbon reduction.The results show that the total carbon emissions of the plant in 2022 were 2472.49 t CO_(2)eq,which is 9.01%higher than the accounting results of the existing standards,with electricity consumption carbon emissions constitute 54.55%of the total carbon emissions.A conceptual model of wastewater treatment plant process was established using BioWin software,and the parameters that significantly affect the output results of the model were determined and calibrated through sensitivity analysis.Select 5 key process parameters that affect effluent quality and carbon emissions,including DO,internal reflux,sludge reflux ratio,emission amount of sludge,and carbon source dosage.Based on the model,design and simulate the optimization plan for the reduction of pollution and carbon emissions.After process optimization,the total carbon emissions have been reduced by 17.25%,and the effluent quality has significantly improved.It is expected to reduce costs by about 299074.70 yuan annually,with considerable economic and environmental benefits.
作者
章易博
柴文波
王长智
金正宇
逯慧杰
ZHANG Yibo;CHAI Wenbo;WANG Changzhi;JIN Zhengyu;LU Huijie(College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310058;Department of Environmental Science and Engineering,Fudan University,Shanghai 200433;Environmental Science Research and Design Institute of Zhejiang Province,Hangzhou 310007;Key Laboratory of Ecology and Environment in Minority Areas,College of Life&Environmental Sciences,Minzu University of China,Beijing 100081)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第9期427-438,共12页
Acta Scientiae Circumstantiae
基金
浙江省“尖兵”“领雁”研发攻关计划资助项目(No.2022C03075)。
关键词
污水处理厂
碳排放核算
BioWin模拟
减污降碳
工艺优化
wastewater treatment plant
carbon emission accounting
BioWin simulation
reduction of pollution and carbon emissions
process optimization
