Integrated pretreatment with capacitive deionization for reverse osmosis reject recovery from water reclamation plant

被引：57

作者：

Lee, Lai Yoke ^{[1
]}

Ng, How Yong ^{[1
]}

Ong, Say Leong ^{[1
]}

Tao, Guihe ^{[2
]}

Kekre, Kiran ^{[2
]}

Viswanath, Balakrishnan ^{[2
]}

Lay, Winson ^{[2
]}

Seah, Harry ^{[2
]}

机构：

[1] Natl Univ Singapore, Ctr Water Res, Div Environm Sci & Engn, Fac Engn, Singapore 117576, Singapore

[2] Publ Util Board, Singapore, Singapore

来源：

WATER RESEARCH | 2009年 / 43卷 / 18期

关键词：

Capacitive deionization; Biological activated carbon; Inorganics removal; Organics removal; Reverse osmosis reject; Water reclamation; MATTER; PURIFICATION;

D O I：

10.1016/j.watres.2009.08.006

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Reverse osmosis (RO) reject recovery from the water reclamation process was demonstrated feasible using an integrated pretreatment scheme followed by the Capacitive Deionization (CDI) process. The RO reject had an average total dissolved solids (TDS) of 1276 +/- 166 mg/L. Water recovery of 85% with water quality comparable with the RO feed was achieved. Pretreatments using biological activated carbon (BAC) and BAC-ultrafiltration (UF) attained total organic carbon (TOC) removal efficiencies of 23.5 +/- 6.0% and 39.9 +/- 9.0%, respectively. Organics removal of RO reject was attributed to simultaneous adsorption and biodegradation in the BAC pretreatment, while further biodegradation in the submerged UF membrane tank provided additional organics removal. Membrane and CDI fouling was reduced by pH adjustment of the pretreated RO reject to approximately 6.5, which prolonged the CDI operation time by at least two times. The CDI process was able to achieve more than 88 and 87% TDS and ion removals, respectively, while PO43- and TOC removals were at 52-81% and 5G-63%, respectively. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：4769 / 4777

页数：9

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