Reducing methane emissions from gravity sewer pipelines by ultrasonication

IF 7.1 2区 环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Mohamadali Mohit , Masoud Makian , Om Prakash , Gyeongcheol Kim , Hojung Rho , Jong-Han Lee , Dong-Hoon Kim
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引用次数: 0

Abstract

Methane (CH4), a potent greenhouse gas (GHG), is a major concern in sewer pipelines, and its emissions can increase with food waste (FW) introduction via disposer systems. To mitigate these emissions, several chemical approaches have been attempted, yet they face environmental and economic challenges. In this study, ultrasonication was applied inside sewer pipelines at different intervals (30 min once every 4, 5, and 6 weeks) to evaluate its long-term effect on CH4 emission reduction. Two lab-scale gravity sewer pipelines (7 m long, 80 mm diameter) were constructed and fed with: only domestic wastewater (R1) and domestic wastewater plus FW (R2). FW addition increased CH4 emissions from 52 to 110 mL CH4/Lsewage, due to higher organics entering the sewer pipelines (500→1000 mg COD/L). Following ultrasonication, CH4 emissions decreased by 40–56 % and 34–39 % in R1 and R2, respectively, attributed to biofilm detachment, as confirmed by changes in extracellular polymeric substances concentration and shear stress test. The average daily GHG reduction by ultrasonication was 10.5, 9.2, and 7.7 g CO2 eq./d for R1, and 15.8, 14.6, and 13.9 g CO2 eq./d for R2, at 4-, 5-, and 6-week intervals, respectively, clearly indicating a revival in CH4 emissions. Considering the energy use, net GHG reduction effectiveness significantly dropped with longer intervals in R1 (38→28 %), while remaining relatively stable (28–30 %) in R2. These results emphasize the importance of shortening ultrasonication intervals, particularly when only domestic wastewater is conveyed in the sewer pipelines.
通过超声波减少重力下水道管道的甲烷排放
甲烷(CH4)是一种强效温室气体(GHG),是下水道管道的主要问题,随着食物垃圾(FW)通过处理系统进入下水道,甲烷的排放量会增加。为了减少这些排放,人们尝试了几种化学方法,但它们面临着环境和经济方面的挑战。在本研究中,超声波在污水管道内以不同的间隔时间(30 min,每4周、5周、6周各1次),评估其对CH4减排的长期效果。建造了两条实验室规模的重力下水道管道(长7 m,直径80 mm),并分别饲喂生活废水(R1)和生活废水加FW (R2)。由于进入下水道管道的有机物含量较高(500→1000 mg COD/L),添加FW使CH4排放量从52增加到110 mL CH4/L。超声处理后,CH4排放量在R1和R2分别下降了40-56 %和34-39 %,归因于生物膜脱离,细胞外聚合物物质浓度的变化和剪切应力测试证实了这一点。在4周、5周和6周的时间间隔内,R1的平均每日温室气体减量分别为10.5、9.2和7.7 g CO2当量/d, R2的平均每日温室气体减量分别为15.8、14.6和13.9 g CO2当量/d,清楚地表明CH4排放的复苏。考虑能源使用,在R1中,净温室气体减排效率随着时间间隔的延长而显著下降(38→28 %),而在R2中保持相对稳定(28 ~ 30 %)。这些结果强调了缩短超声间隔的重要性,特别是当只有生活污水在污水管道中输送时。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Environmental Technology & Innovation
Environmental Technology & Innovation Environmental Science-General Environmental Science
CiteScore
14.00
自引率
4.20%
发文量
435
审稿时长
74 days
期刊介绍: Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.
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