Methane production in an anaerobic osmotic membrane bioreactor using forward osmosis: Effect of reverse salt flux

Sheng Li, Youngjin Kim, Sherub Phuntsho, Laura Chekli, Ho Kyong Shon, TorOve Leiknes, NorEddine Ghaffour

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

This study investigated the impact of reverse salt flux (RSF) on microbe community and bio-methane production in a simulated fertilizer driven FO-AnMBR system using KCl, KNO3 and KH2PO4 as draw solutes. Results showed that KH2PO4 exhibited the lowest RSF in terms of molar concentration 19.1 mM/(m2.h), while for KCl and KNO3 it was 32.2 and 120.8 mM/(m2.h), respectively. Interestingly, bio-methane production displayed an opposite order with KH2PO4, followed by KCl and KNO3. Pyrosequencing results revealed the presence of different bacterial communities among the tested fertilizers. Bacterial community of sludge exposed to KH2PO4 was very similar to that of DI-water and KCl. However, results with KNO3 were different since the denitrifying bacteria were found to have a higher percentage than the sludge with other fertilizers. This study demonstrated that RSF has a negative effect on bio-methane production, probably by influencing the sludge bacterial community via environment modification.
Original languageEnglish (US)
Pages (from-to)285-293
Number of pages9
JournalBioresource Technology
Volume239
DOIs
StatePublished - May 10 2017

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