Key Lab of Environmental Engineering, Shaanxi Province, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China.
International S&T Cooperation Center for Urban Alternative Water Resources Development, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, PR China.
Bioresour Technol. 2021 Jun;330:124966. doi: 10.1016/j.biortech.2021.124966. Epub 2021 Mar 12.
The enhancement effects of biochar to an anaerobic membrane bioreactor (AnMBR) treating sewage at low temperatures was investigated in this study through analyzing organics removal, digestion performance, mixed liquor properties, membrane resistance, and foulant compositions. The chemical oxygen demand (COD) removal efficiency and the COD converted to methane rate increased by more than 12.5% at 10 °C, mainly because of the promotion of biochar to volatile fatty acids degradation. Although biochar caused higher dissolved organic matter (DOM) concentration in the AnMBR, it improved the filtration property of the bulk sludge and absorbed the hydrophobic DOM. The decreased filtration resistance assisted by biochar leads to a prolonged membrane operation duration over 200%. Surface foulants, especially cake foulants, were largely mitigated by the enhanced scouring intensity of mixed liquor at the membrane surface, and hence, decreasing the cake/gel foulants ratio.
本研究通过分析有机物去除率、消化性能、混合液特性、膜阻力和污垢成分，探讨了生物炭对低温下厌氧膜生物反应器（AnMBR）处理污水的增强效果。在 10°C 时，化学需氧量（COD）去除效率和 COD 转化为甲烷的速率提高了 12.5%以上，这主要是因为生物炭促进了挥发性脂肪酸的降解。尽管生物炭导致 AnMBR 中溶解有机物（DOM）浓度升高，但它改善了絮体污泥的过滤性能，并吸收了疏水性 DOM。生物炭有助于降低过滤阻力，从而使膜运行时间延长了 200%以上。通过增强混合液在膜表面的冲刷强度，表面污垢，特别是滤饼污垢得到了很大程度的缓解，从而降低了滤饼/凝胶污垢的比例。
