摘要
【目的】研究通过碳排放核算,针对北方季节水源性河道使用再生水作为生态补水回灌河道、恢复水生态、改善水质的情况,探讨流域污水处理再生生态补水系统的扩建布局模式。【方法】以北方某流域为例,根据《城镇水务系统碳核算与减排路径技术指南》中关于污水系统、再生水系统的碳核算边界和方法,采用对比分析法,重点分析集中+分散建设与全集中建设2种模式的碳排放特征,开展建设期和运营期的碳排放核算研究。【结果】建设期集中+分散建设、全集中建设的碳排量分别为101583、107172 t CO_(2)^(-)eq,运营期的碳排量分别为2.530、4.164 kg CO_(2)^(-)eq/m^(3),相比分别减少了5.21%和39.24%,其中污水收集管网的单位碳排放量相差76.76%。【结论】建设期碳排放量主要取决于建设的工程量,集中+分散建设模式总体上工程量越小,碳排放量低;运营期单位碳排放量的主要影响因素有污水在收集管网中的平均水力停留时间、污水处理厂的能耗和药耗、再生水提升的能耗等,污水在收集管网中的平均水力停留时间影响幅度最大,在评估时作为首要因素,总体上集中+分散建设模式的碳排放量低。因此,从降碳视角,集中+分散建设模式在建设期和运营期降低碳排放方面具有显著优势,推荐在类似流域污水处理再生生态补水系统扩建布局中推荐优先使用,对“双碳”目标下的水生态修复与水环境的改善具有重要意义。
[Objective]This study evaluates carbon emissions through the lens of using regenerated water for ecological compensation and subsurface recharge in seasonal water source channels of northern regions,aiming to restore aquatic ecosystems and improve water quality.[Methods]Taking a northern river basin as a case,the research compared two expansion patterns concentrated+distributed construction versus fully concentrated construction for wastewater treatment and ecological compensation systems.Following the carbon accounting boundaries and method ologies outlines in the Technical Guidelines for Carbon Accounting and Emission Reduction Paths in Urban Water Systems,the study employs contrastive analysis to examine carbon emission characteristics during both the construction and operation phases.[Results]Carbon emissions during construction are 101583 t CO_(2)^(-)eq for the concentrated+distributed model and 107172 t CO_(2)^(-)eq for the fully concentrated model,while unit carbon emissions during operation are 2.530 kg CO_(2)^(-)eq/m^(3) and 4.164 kg CO_(2)^(-)eq/m^(3),respectively,representing reductions of 5.21%and 39.24%.Notably,unit carbon emissions from wastewater collection networks differes by 76.76%between the two models.[Conclusion]Construction-phase emissions primarily depend on project scale,with the concentrated+distributed model generally requiring smaller engineering scope and thus lower emissions.The main influencing factors of unit carbon emissions during the operation period include the average hydraulic retention time of wastewater in the collection pipeline network,energy and chemical consumption of wastewater treatment plants,and energy consumption of recycled water upgrading.The average hydraulic retention time of wastewater in the collection pipeline network has the greatest impact.Therefore,the concentrated+distributed model demonstrates significant advantages in reducing carbon emissions during both construction and operation phases.This approach is recommended for priority adoption in similar basin expansions of wastewater treatment and ecological compensation systems,offering critical support for water ecosystem restoration and environmental quality improvement under China's"dual carbon"goals.
作者
窦娜莎
殷豪帅
黄开
赵荣
DOU Nasha;YIN Haoshuai;HUANG Kai;ZHAO Rong(Qingdao Engineering Consulting Institute<Qingdao Industrial Research Institute>,Qingdao 266035,China;Shanghai Municipal Engineering Design Institute<Group>Co.,Ltd.,Shanghai 200092,China)
出处
《净水技术》
2025年第8期154-163,180,共11页
Water Purification Technology
关键词
流域
污水厂尾水生态补水
集中+分散建设
全集中建设
碳排放
river basin
ecological reclaimed water compensation for WWTP tailwater
concentrated+distributed construction
fully concentrated construction
carbon emission
作者简介
窦娜莎(1983-),女,高级工程师,研究方向为污水及固体废弃物污染控制技术、水生态修复与重建,E-mail:qdzxy0807@126.com;通信作者:黄开(1972-),男,正高级工程师,研究方向为水处理工程、海绵城市、水环境整治与水生态修复,E-mail:huangkai1@smedi.com。
