Treatment of reverse osmosis concentrate using an algal-based MBR combined with ozone pretreatment

WATER RESEARCH

卷:159

Article

Woo, Hyoungmin¹  Yang, Hee Sung²  Timmes, Thomas C.³  Han, Changseok⁴  Nam, Joo-Youn⁵  Byun, Seokjong⁶  Kim, Sungpyo⁷  Ryu, Hodon¹  Kim, Hyun-Chul⁸ 

[1] US EPA, Off Res & Dev, 26 W Martin Luther King Dr, Cincinnati, OH 45268 USA

[2] Univ Seoul, Dept Environm Engn, Seoul 02504, South Korea

[3] Virginia Mil Inst, Dept Civil & Environm Engn, Lexington, VA 24450 USA

[4] Inha Univ, Dept Environm Engn, Incheon 22212, South Korea

[5] Korea Inst Energy Res, Jeju Global Res Ctr, Jeju Si 63357, Jeju Do, South Korea

[6] Jeollanamdo Environm Ind Promot Inst, Dept Res & Dev, Naju Si 59205, Jeollanam Do, South Korea

[7] Korea Univ, Dept Environm Engn, Coll Sci & Technol, Sejong 30019, South Korea

[8] Korea Univ, Res Inst Adv Ind Technol, Coll Sci & Technol, Sejong 30019, South Korea

关键词: Reverse osmosis concentrate;    Ozonation;    Microalgae;    Microfiltration;    Fouling;   

DOI  :  10.1016/j.watres.2019.05.003

来源: Elsevier

【 摘 要 】

Algal treatment was combined with ozone pretreatment for treatment of synthetic reverse osmosis concentrate (ROC) prior to microfiltration. The research mainly focused on minimizing the fouling of polyvinylidene-fluoride membranes and maximizing the restoration of membrane permeability. The algal treatment alone was only moderately effective for the mitigation of fouling in microfiltration, while a markedly improved performance was achieved when the algal treatment followed ozonation. The combination of ozonation and algal treatment reduced membrane permeability decline and significantly (p <0.05) increased the reversibility of fouling after hydraulic washing. A longitudinal evaluation was also performed with a goal of achieving a robust removal of contaminants. Ozonation followed by algal treatment was very effective in attenuating both caffeine and carbamazepine, as well as removing organic matter and inorganic nutrients from ROC in a single bioreactor. In this study, an alkaline condition (similar to pH 12), produced by microalgae in the light without supplemental aeration was applied for in situ cleaning of fouled membranes. The result showed that the algal-induced cleaning successfully restored the permeability of organic-fouled membranes during the filtration of both raw and algal treated ROC. This in-situ strategy offers a novel option for periodic cleaning of fouled membranes while maintaining operational simplicity, especially for existing submerged membrane filtration facilities. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

Free