Efficacy of hybrid adsorption/membrane pretreatment for low pressure membrane

WATER RESEARCH

卷:99

Article

Malczewska, B.^1,2  Benjamin, M. M.¹ 

[1] Univ Washington, Civil & Environm Engn, Box 352700, Seattle, WA 98195 USA

[2] Wroclaw Univ Environm & Life Sci, Fac Environm Engn & Geodesy, Pl Grunwaldzki 24, PL-50363 Wroclaw, Poland

关键词: Membrane fouling;    Natural organic matter;    Aluminum oxide particles;    HAOPs;    Precoat filtration;   

DOI  :  10.1016/j.watres.2016.04.065

来源: Elsevier

【 摘 要 】

Fouling by natural organic matter (NOM) is a major obstacle when water from natural sources is treated using low-pressure membranes. Prior research by our group has demonstrated that passing natural water through a thin, pre-deposited layer of heated aluminum oxide particles (HAOPs) can remove substantial amounts of NOM from the feed and thereby reduce the fouling rate of downstream membranes. The work reported here explored the technical efficacy of such a pretreatment process under more challenging (and therefore realistic) conditions than reported earlier. Several analytical techniques were applied to the feed and permeate in an attempt to identify the key fouling components. The results demonstrate that a HAOPs layer can be pre-deposited on a stainless steel mesh and then be readily washed off at the end of a filtration cycle with very little irreversible fouling due to residual NOM or HAOPs left on the mesh. In addition, the pretreatment step removes enough foulant to allow a downstream UF membrane to operate at significantly higher fluxes than when conventional pretreatment is applied. HAOPs pretreatment also reduced the formation of chlorinated and brominated trihalomethanes (THM4) by more than 67% and of haloacetic acids (HAA9) by 64%-88% in simulated distribution system (SDS) tests. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free