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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 13, 2006
Accepted June 9, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Control of residual organic matter to reduce bacterial regrowth potential for wastewater reuse

Shijun Kim Jeongsook Kim^1† Yutaka Suzuki²

Ulsan Regional Innovation Agency, #758-2 Yenamdong, Buggu, Ulsan 683-804, Korea ¹Busan Environmental Technology Center, #203 Daeyeondong, Namgu, Busan 608-737, Korea ²Recycling Research Team, Material and Geotechnical Engineering Research Group, Public Works Research Institute, Minamihara 1-6, Tsukuba, Ibaraki 305-8516, Japan

jkim@km-c.ac.kr

Korean Journal of Chemical Engineering, November 2007, 24(6), 1042-1046(5), 10.1007/s11814-007-0118-3

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Abstract

Several problems have been reported about accumulated microorganisms in reclaimed water distribution systems. This paper presents the results of residual organic matter (OM) removal and apparent bacterial regrowth potential of treated wastewater obtained from laboratory-scale experiments using advanced biological treatments: two immobilization processes in series and a membrane bioreactor (MBR) process. Furthermore, a nanofiltration (NF) membrane process was applied to effluents of both advanced biological treatments. The immobilization process removed large molecular weight (MW) fractions >5,000 since immobilized microorganisms had sufficiently acclimated. The NF membrane was more effective in rejecting large MW fractions in the effluents of the immobilization and the MBR treatments. But it was difficult to reject small MW fractions <1,000 by NF. Neutral hydrophilic fraction of DOC was reduced by both advanced biological processes, and it can be thought that the microorganisms in the advanced processes could decompose and grow on some part of the neutral hydrophilic fraction. Quantity of attached microorganisms in the second immobilization reactor was significantly reduced compared to that in the first immobilization reactor. This suggests that apparent bacterial regrowth potential is controlled by the accumulation of effective microorganisms in the first reactor.

Keywords

Wastewater Reuse Bacterial Regrowth Biological Advanced Treatment

References

Gary AL, Curtis BW, Mosen B, Water Sci. Technol., 19, 529 (1987)
Dignac MF, Ginestet P, Rybacki D, Bruchet A, Urbain V, Scribe P, Water Res., 34(17), 4185 (2000)
Manka J, Rebhun M, Water Res., 16, 399 (1982)
Hem LJ, Efraimsen H, Water Res., 35(4), 1106 (2001)
Shon HK, Kim SH, Erdei L, Vigneswaran S, Korean J. Chem. Eng., 23(4), 581 (2006)
Namour, Muller MC, Water Res., 32, 2224 (1988)