标題: Life Cycle Assessment and Life Cycle Cost of Sludge Dewatering, Conditioned with Fe2+/H2O2, Fe2+/Ca(ClO)2, Fe2+/Na2S2O8, and Fe3+/ CaO Based on Pilot-Scale Study Data

作者: Wang, SY (Wang, Shiyu); Sadhukhan, J (Sadhukhan, Jhuma); Xuan, J (Xuan, Jin); Yu, YJ (Yu, Yanjuan); Mao, XH (Mao, Xuhui); Wang, ML (Wang, Mingliang); Chen, XF (Chen, Xiaofei); Zhou, XG (Zhou, Xiaoguo); Xing, L (Xing, Lei); Wang, X (Wang, Xu)

來源出版物: ACS SUSTAINABLE CHEMISTRY & ENGINEERING DOI: 10.1021/acssuschemeng.3c00505 提前訪問日期: APR 2023

摘要: Numerous advanced oxidation processes (AOPs) have been developed for conditioning sewage sludge due to their excellent dewaterability, which can reduce the water content of sludge to below 60 wt %. However, the application of different chemical reagents for sludge dewatering inevitably causes varying degrees of environmental impact and economic pressure. It is still questionable whether advanced sludge dewatering processes can reduce environmental and economic burdens. In this work, life cycle assessment (LCA) and life cycle cost (LCC) of three types of AOPs (Fe2+/H2O2, Fe2+/Ca(ClO)2, and Fe2+/Na2S2O8) were compared to the traditional conditioner (Fe3+/CaO) for the first time based on pilot-scale study data to measure the optimal choice of environmental and economic performance. Fe2+/Ca(ClO)2 and Fe2+/H2O2 exhibited the highest and lowest environmental and economic burdens, respectively. Among them, the total environmental impact and total cost of Fe2+/H2O2 were equivalent to 54-62% and 56-66% of other processes, respectively. In the sludge treatment routes, the sludge conditioning and landfill stages were the largest contributors to the environmental impact and economic cost. The greenhouse gas emissions and particulate matter generation were the main impact indicators of LCA and LCC. In addition, the superior dewatering performance did not result in significant environmental benefits. The obtained LCA and LCC results will support the selection and application of sludge pretreatment processes in wastewater treatment plants and contribute to the improvement and development of the technology.

作者關鍵詞: Waste activated sludge; Advanced oxidation processes; Dewatering; Life cycle assessment; Life cycle cost

地址: [Wang, Shiyu; Mao, Xuhui; Wang, Xu] Wuhan Univ, Sch Resources & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.

[Sadhukhan, Jhuma; Xuan, Jin; Xing, Lei] Univ Surrey, Fac Engn & Phys Sci, Dept Chem & Proc Engn, Guildford GU27XH, England.

[Yu, Yanjuan] Liaoning Yujia Technol Co Ltd, Shenyang 115000, Liaoning, Peoples R China.

[Wang, Mingliang] China Commun Construct Co Ltd, Beijing 100088, Peoples R China.

[Chen, Xiaofei] Hubei Prov Acad Ecoenvironm Sci, Wuhan 430079, Peoples R China.

[Zhou, Xiaoguo] Yangtze Ecol & Environm Co Ltd, Wuhan 430077, Peoples R China.

通訊作者地址: Wang, X (通訊作者)，Wuhan Univ, Sch Resources & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430079, Peoples R China.

Xing, L (通訊作者)，Univ Surrey, Fac Engn & Phys Sci, Dept Chem & Proc Engn, Guildford GU27XH, England.

電子郵件地址: l.xing@surrey.ac.uk; xu.wang@whu.edu.cn

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