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Effects of the Variation of Aeration Time in Sequencing Batch Reactor (SBR) (1) - Nutrient Removal

Sequencing Batch Reactor (SBR)에서 포기시간 변경에 따른 영향 (1) - 영양염류 제거

  • Jeong, No-Sung (Department of Environmental Science, Catholic University of Daegu) ;
  • Park, Young-Seek (Department of Health & Environment, Daegu University) ;
  • Kim, Dong-Seog (Department of Environmental Science, Catholic University of Daegu)
  • 정노성 (대구가톨릭대학교 환경과학과) ;
  • 박영식 (대구대학교 보건과학부) ;
  • 김동석 (대구가톨릭대학교 환경과학과)
  • Received : 2010.08.24
  • Accepted : 2010.09.25
  • Published : 2011.01.31

Abstract

The effect of the variation of aeration time on the removal of organics, nitrogen and phosphorus using synthetic wastewater was investigated in sequencing batch reactors (SBRs) which included DNPAOs and DNGAOs. The cycling times in four SBRs were adjusted to 12 hours and then included different aerobic times as 1 hr, 2.5 hr, 4 hr and 5.5 hr, respectively. Four SBR systems have been operated and investigated for over 40 days. Average TOC removal efficiencies were about 71 % in all SBRs. The $NH_4^+$-N removal efficiency was increased as the increase of aeration time. After changing aeration time, the total nitrogen removal efficiencies of SBRs were shown as 35 %, 85 %, 75 % and 65 %, respectively. Higher phosphorus release and uptake were occurred as the decrease of the aeration time. After all, the overall phosphorus removal efficiency decreased and the deterioration of phosphorus removal was occurred when aeration time was over 4 hr. Denitrification in aerobic conditions was observed, which showed the presence of DNPAOs and DNGAOs. In batch experiments, PAOs were shown as the most important microorganisms for the phosphorus removal in this experiment, and the role of DNGAOs was higher than that of DNAPOs for the nitrogen removal.

Keywords

SBR;Aeration time;Nutrient removal;PAOs;DNPAOs;DNGAOS;Batch experiment

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