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Article

Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water

1
Heilongjiang Institute of Construction Technology, 999 Xueyuan Road, Hulan District, Harbin 150025, China
2
State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China
*
Author to whom correspondence should be addressed.
Water 2024, 16(17), 2374; https://doi.org/10.3390/w16172374
Submission received: 15 June 2024 / Revised: 10 August 2024 / Accepted: 14 August 2024 / Published: 23 August 2024
(This article belongs to the Special Issue Application of Membrane-Based Technology in Water Treatment)

Abstract

Manganese pollution in surface water has been a new concern in decentralized drinking water treatment. The dissolved manganese cannot be effectively removed by the traditional ultrafiltration (UF) process, but will cause severe membrane fouling. To address such issues, an innovative gravity-driven membrane (GDM) coupled with a dynamic manganese oxide (MnOx) film on the membrane surface was proposed, with hopes of enhancing manganese removal and alleviating membrane fouling. The results demonstrated that pre-coating a dynamic MnOx film on the membrane surface of a GDM system would effectively reduce start-up time for removing iron and manganese pollutants, without affecting the flux stabilization of the GDM. Effective manganese removal (~80%) primarily depended on the adsorption and auto-catalytic oxidation facilitated by the pre-coating of MnOx. Furthermore, the MnOx film notably enhanced organic pollutant removal efficiency. Additionally, the MnOx coated on the membrane surface acted as a skeleton, promoting the gradual formation of a biocake layer with a heterogeneous and porous structure, which benefited the flux stabilization of the GDM. In particular, the fine and homogeneous MnOx-M derived from the backflushing water of the mature manganese sand filter exhibited precise and uniform coating on the membrane surface, effectively mitigating the irreversible pore plugging caused by organic matter penetration and thereby enhancing stable flux by ~16.3% compared to the control. This study offered a novel strategy to enhance the purification efficiency of GDM system treating manganese pollution and was expected to contribute to the technological advancement of decentralized water supply scenarios.
Keywords: gravity-driven membrane (GDM); manganese oxide (MnOx); removal of manganese; shorten start-up period; surface water gravity-driven membrane (GDM); manganese oxide (MnOx); removal of manganese; shorten start-up period; surface water

Share and Cite

MDPI and ACS Style

Luo, J.; Zhang, Y.; Chang, H.; Lin, C.; Hu, Y.; Wang, H.; Wang, Y.; Tang, X. Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water. Water 2024, 16, 2374. https://doi.org/10.3390/w16172374

AMA Style

Luo J, Zhang Y, Chang H, Lin C, Hu Y, Wang H, Wang Y, Tang X. Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water. Water. 2024; 16(17):2374. https://doi.org/10.3390/w16172374

Chicago/Turabian Style

Luo, Jiaoying, Yaru Zhang, Hailin Chang, Chenghai Lin, Yating Hu, Haochun Wang, Yanrui Wang, and Xiaobin Tang. 2024. "Manganese Oxide Enhanced Gravity-Driven Membrane (GDM) Filtration in Treating Iron- and Manganese-Containing Surface Water" Water 16, no. 17: 2374. https://doi.org/10.3390/w16172374

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