State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, PR China.
School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, PR China.
J Hazard Mater. 2021 May 5;409:124983. doi: 10.1016/j.jhazmat.2020.124983. Epub 2020 Dec 28.
The presence of Fe and Mn would cause severe ultrafiltration (UF) membrane fouling and limited its extensive application in treating the groundwater. A pilot-scale gravity-driven membrane (GDM) process which coupled the dual roles of biocake layer and UF membrane was introduced to treat the groundwater under high Mnconcentrations and low temperature conditions. The results indicated that flux stabilization was observed during long-term GDM filtration with average stabilized fluxes of 3.6-5.7 L m h. GDM process conferred efficient removals of Fe and Mn with both average removals > 95%. Pre-adding manganese oxides (MnOx) could effectively shorten the ripening period of manganese removal from 50 to 30 days, and simultaneously contribute to the Mn removal and flux improvements. The presence of Mn facilitated the formation of heterogeneous structures of biocake layer to primarily determine the flux stabilization of GDM, while the influence of extracellular polymeric substances (EPS) concentrations was nearly negligible. Besides, the Mn removal was primarily attributed to the biocake layer other than UF membrane itself, and the chemically auto-catalytic oxidation by MnOx particles played the pivotal role. Therefore, these findings provide relevance for establishing new strategies in treating the iron-and manganese-containing groundwater.
铁和锰的存在会导致严重的超滤（UF）膜污染，限制了其在处理地下水方面的广泛应用。本研究采用一种中试规模的重力驱动膜（GDM）工艺，该工艺结合了生物滤饼层和 UF 膜的双重作用，用于处理高浓度锰和低温条件下的地下水。结果表明，在长期 GDM 过滤过程中通量稳定，平均稳定通量为 3.6-5.7 L m h。GDM 工艺对铁和锰的去除效率很高，平均去除率均>95%。预先添加锰氧化物（MnOx）可以有效地将锰去除的成熟周期从 50 天缩短至 30 天，同时有助于锰的去除和通量的提高。锰的存在促进了生物滤饼层异质结构的形成，主要决定了 GDM 的通量稳定，而细胞外聚合物（EPS）浓度的影响可以忽略不计。此外，锰的去除主要归因于生物滤饼层而不是 UF 膜本身，MnOx 颗粒的化学自催化氧化起关键作用。因此，这些发现为处理含铁和含锰地下水提供了新的策略。
