Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Bacterial regrowth in biofilms formed in granular activated carbon filter adsorbers and the bacterial isolation and identification

입상 활성탄 여과지에서 세균의 재성장과 생물막 형성 세균의 분리 및 동정

  • 이규철 (한국수자원공사 수자원연구원 수돗물분석연구센터) ;
  • 권순복 (한국수자원공사 수자원연구원 수돗물분석연구센터) ;
  • 이병기 (한국수자원공사 수자원연구원 수돗물분석연구센터) ;
  • 박종근 (대구대학교 사범대학 환경교육과)
  • Received : 2008.01.10
  • Accepted : 2008.03.12
  • Published : 2008.04.15
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Abstract

This study aimed to investigate the biofilm formation, bacterial regrowth, and bacterial community structure in the granular-activated carbon (GAC) filter adsorbers (FAs) used in water treatment plants. In 2005 and 2006, raw water, settled water, GAC FA by depth, and filtered water were collected twice a year from water treatment plants (WTPs) B and S. The number of heterotrophic bacteria, including mesophilic and psychrophilic bacteria, in such collected waters was investigated along with the total number of coliforms therein. Heterotrophic bacteria were detected in most samples, mainly at the surface layers of the GAC FAs, and fewer such bacteria were found in the lower and bottom layers. An increase in the bacterial number, however, was observed in the samples from various depths of the GAC FAs in WTPs B and S compared with the surface layers. An increase in the bacterial number was also detected in the filtered water. This may indicate that there is a regrowth of the bacteria in the GAC FA. Considering, however, that heterotrophic bacteria were not found in the filtered water, it can be deduced that most bacteria are removed in the chlorination process. Coliforms were detected at the surface layer of the GAC FAs, but their regrowth was not observed. MicroLog systems were used to identify the bacteria community distribution. Eight genera and 14 species, including Pseudomonas spp., were detected in WTP B, and 8 genera and 9 species, including Aeromonas spp., in WTP S. Further studies are required to elucidate their role in the biofilms in water treatment processes.

Keywords

Acknowledgement

Supported by : 한국수자원공사

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