Membrane and Water Treatment

  • 제10권5호
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  • Pages.331-338
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  • 2019
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Membrane fouling and sludge characteristics in submerged membrane bioreactor under low temperature

  • Yuan, Yuan (College of Bioengineering, Beijing Polytechnic) ;
  • Zhang, Jianqiao (Environmental Protection and Water Affairs Bureau, Luohu District)
  • 투고 : 2018.05.17
  • 심사 : 2019.04.10
  • 발행 : 2019.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study aimed to investigate the membrane fouling and sludge characteristics in a pilot-scale submerged membrane bioreactor (MBR) operated under low temperature ($7^{\circ}C$). To elucidate the mechanisms of membrane fouling at low temperature, we studied the correlation between MBR performances and physicochemical properties of sludge including extracellular polymeric substance (EPS), relative hydrophobicity (RH) and floc size during long-term operation. The MBR was shown able to remove chemical oxygen demand (COD) stably and efficiently (>90 %) in the case of overgrowth of filamentous bacteria (bulking sludge) at low temperature. On the other hand, the occurrence of filamentous bulking greatly accelerated membrane fouling, as indicated by membrane filtration period of 14 days for filamentous bulking at $7^{\circ}C$, in comparison with that of 27 days for non-bulking sludge at $24^{\circ}C$ The overgrowth of filamentous bacteria resulting from low-temperature condition led to an increased release of EPS, higher RH, smaller floc size and lower fractal dimension of sludge. These factors accelerated the formation of compact cake layer on membrane surface in association with performance diminution in terms of increase in transmembrane pressure (TMP) of the membrane and thus the decrease in membrane permeability.

키워드

과제정보

연구 과제 주관 기관 : Beijing PolyTechnic

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