文献类型：期刊文献

英文题名：Anaerobic co-digestion of expired alcohol-based hand sanitizer with synthetic wastewater for biogas production

作者：Vu, Hang P.[1];Cai, Zhengqing[2,3];Tra, Van-Tung[4];Wang, Qilin[1];Nghiem, Long D.[1,4]

机构：[1]Univ Technol Sydney, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200237, Peoples R China;[4]Nguyen Tat Thanh Univ, Inst Environm Sci, Ho Chi Minh City, Vietnam

年份：2023

卷号：32

外文期刊名：ENVIRONMENTAL TECHNOLOGY & INNOVATION

收录：;EI(收录号：20233714709156);WOS:【SCI-EXPANDED(收录号:WOS:001059410200001)】；

基金：The authors acknowledge financial support from RACE2030-CRC for this project.

语种：英文

外文关键词：Anaerobic co-digestion; Biogas; Alcohol-based sanitizers; COVID-19; Sewage sludge

摘要：In this work, anaerobic co-digestion was demonstrated as a viable method for utilizing expired alcohol-based hand sanitizer from COVID-19 response for additional biogas production. Co-digestion experiments were conducted using three parallel continuous flow anaerobic digesters. The results highlight the importance of acclimatisation to avoid process instability. Process instability was observed when co-digesting ethanolbased sanitizer (at 0.3% v/v) with sewage sludge without acclimatisation. However, the digester was fully recoverable and a gradual increase in the addition of ethanolbased sanitizer showed stable and good performance even at 0.6% v/v. The specific biogas production was in the range of 295-304 mL/gCOD.day and the COD removal efficiency was 76%. When isopropanol-based sanitizer was used as a co-substrate, digester previously acclimatised with ethanol-based sanitizer showed 20% higher biogas production than another digester that has not been acclimatised. These results highlight the need for an acclimatisation period so that the microbial community can adjust to the new substrate. Furthermore, due to the easily degradable nature of alcoholbased sanitizer and synthetic wastewater in this study, there was a threshold of organic loading rate of 3.5-4 gCOD/L.day. This threshold can be explained by the accumulation of volatile fatty acids that could inhibit the methanogenesis process. Results in this study demonstrate anaerobic co-digestion as a sustainable option for valorizing expired alcohol-based hand sanitizer. Crown Copyright & COPY; 2023 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).