预沉积生物炭强化重力驱动超滤膜处理受污染地表水的效能研究

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Abstract In this study, pre-deposition of biochar (BC) was conducted to strengthen gravity-driven membrane (GDM) performance for treating contaminated surface water, and the effect of pre-deposited biochar on water flux and decontamination efficiency was investigated. The applied BC was a mesoporous material prepared by pyrolysis of corn stalk powder at a high temperature of 600℃. The obtained BC possessed rich pore structure and abundant oxygen-containing functional groups, with specific surface area and total pore volume of 181.09m²/g and 0.12cm³/g, respectively. The feed water was realistic Jialing River water polluted by domestic sewage, and the filtration operation period was 50d. The pristine membrane in the absence of BC deposition served as a control group (i.e., GDM). During membrane filtration process, we systematically investigated the flux stability, removal efficiency on main water quality parameters including turbidity, dissolved organic carbon (DOC), UV₂₅₄, fluorescent organics and ammonia of both control GDM and BC-GDM systems. The results show that the stable flux (4.82L/(m²·h)) of BC-GDM was slightly higher than that of control GDM (4.72L/(m²·h)) under long-term operation. The pollutants removal performance indicate that the BC-GDM system slightly improved the removal of turbidity and ammonia, accelerated the start-up process of ammonia removal, and significantly improved the organic removal such as DOC, UV₂₅₄ and fluorescent organics. Specifically, after BC pre-deposition, the average removal efficiency of DOC and UV₂₅₄ increased from 16.7% and 10% to 34.1% and 39.9%, respectively. Our results reveal that pre-deposition of BC in GDM could effectively improve the water purification efficiency without compromising membrane water flux.

Key words： gravity-driven membrane (GDM) pre-deposition biochar stable flux pollutant removal efficiency

Received: 29 July 2022

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X703

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	Articles by authors
	HE Qiang
	ZUO Qing-yang
	CHEN Zi-wei
	LIU Cai-hong
	ZHANG Tang-long
	ZHI Yue

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HE Qiang,ZUO Qing-yang,CHEN Zi-wei等. Pre-deposition of biochar layer improves the performance of gravity-driven membrane(GDM) filtration system for polluted surface water treatment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1122-1130.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1122

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