Pre-deposition of biochar layer improves the performance of gravity-driven membrane(GDM) filtration system for polluted surface water treatment
HE Qiang, ZUO Qing-yang, CHEN Zi-wei, LIU Cai-hong, ZHANG Tang-long, ZHI Yue
Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400044, China
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.
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