Effect of engineered environment on microbial community structure in biofilter and biofilm on reverse osmosis membrane
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ArticleAuthors
Jeong, SanghyunCho, Kyungjin
Jeong, Dawoon
Lee, Seockheon
Leiknes, TorOve

Vigneswaran, Saravanamuthu
Bae, Hyokwan

KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionEnvironmental Science and Engineering Program
Water Desalination and Reuse Research Center (WDRC)
Date
2017-07-25Online Publication Date
2017-07-25Print Publication Date
2017-11Permanent link to this record
http://hdl.handle.net/10754/625270
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Four dual media filters (DMFs) were operated in a biofiltration mode with different engineered environments (DMF I and II: coagulation with/without acidification and DMF III and IV: without/with chlorination). Designed biofilm enrichment reactors (BERs) containing the removable reverse osmosis (RO) coupons, were connected at the end of the DMFs in parallel to analyze the biofilm on the RO membrane by DMF effluents. Filtration performances were evaluated in terms of dissolved organic carbon (DOC) and assimilable organic carbon (AOC). Organic foulants on the RO membrane were also quantified and fractionized. The bacterial community structures in liquid (seawater and effluent) and biofilm (DMF and RO) samples were analyzed using 454-pyrosequencing. The DMF IV fed with the chlorinated seawater demonstrated the highest reductions of DOC including LMW-N as well as AOC among the other DMFs. The DMF IV was also effective in reducing organic foulants on the RO membrane surface. The bacterial community structure was grouped according to the sample phase (i.e., liquid and biofilm samples), sampling location (i.e., DMF and RO samples), and chlorination (chlorinated and non-chlorinated samples). In particular, the biofilm community in the DMF IV differed from the other DMF treatments, suggesting that chlorination exerted as stronger selective pressure than pH adjustment or coagulation on the biofilm community. In the DMF IV, several chemoorganotrophic chlorine-resistant biofilm-forming bacteria such as Hyphomonas, Erythrobacter, and Sphingomonas were predominant, and they may enhance organic carbon degradation efficiency. Diverse halophilic or halotolerant organic degraders were also found in other DMFs (i.e., DMF I, II, and III). Various kinds of dominant biofilm-forming bacteria were also investigated in RO membrane samples; the results provided possible candidates that cause biofouling when DMF process is applied as the pretreatment option for the RO process.Citation
Jeong S, Cho K, Jeong D, Lee S, Leiknes T, et al. (2017) Effect of engineered environment on microbial community structure in biofilter and biofilm on reverse osmosis membrane. Water Research. Available: http://dx.doi.org/10.1016/j.watres.2017.07.064.Sponsors
This research was supported by grants (codes 17IFIP-B088091-04 and 17IFIP-B065893-05) from Industrial Facilities & Infrastructure Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government.Publisher
Elsevier BVJournal
Water ResearchPubMed ID
28759795Additional Links
http://www.sciencedirect.com/science/article/pii/S0043135417306371ae974a485f413a2113503eed53cd6c53
10.1016/j.watres.2017.07.064
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