Membrane and Water Treatment

  • 제6권6호
  • /
  • Pages.501-512
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  • 2015
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Relation between sludge properties and filterability in MBR: Under infinite SRT

  • Zhang, Haifeng (School of Chemistry Engineering, Northeast Dianli University) ;
  • Wang, Bing (School of Chemistry Engineering, Northeast Dianli University) ;
  • Yu, Haihuan (School of Chemistry Engineering, Northeast Dianli University) ;
  • Zhang, Lanhe (School of Chemistry Engineering, Northeast Dianli University) ;
  • Song, Lianfa (Department of Civil, Environmental, and Construction Engineering, Texas Tech University)
  • 투고 : 2015.01.31
  • 심사 : 2015.11.04
  • 발행 : 2015.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

A laboratory-scale submerged membrane bioreactor (MBR) was continuously operated for 100 d at an infinite sludge retention time (SRT) with the aim of identifying possible relation between the filterability of mixed liquor and sludge properties, such as extracellular polymeric substances (EPS), soluble microbial products (SMP), viscosity of mixed liquor, zeta potential of flocs and particle size distributions (PSD). Research results confirmed that MBR can operate with a complete sludge retention ensuring good treatment performances for COD and $NH_3-N$. However, the long term operation (about 40 d) of MBR with no sludge discharge had a negative influence on sludge filterability, and an increase in membrane fouling rates with the time was observed. There as a strong correlation between the sludge filterability and the fouling rate. Among the different sludge properties parameters, the concentration SMP and EPS had a more closely correlation with the sludge filterability. The concentrations of SMP, especially SMP with MW above 10 kDa, had a strong direct correlation to the filterability of mixed sludge. The protein fractions in EPS were biodegradable and available for microorganism metabolism after about 60 days, and the carbohydrates in EPS had a significantly negative effect on sludge filterability in MBR at an infinite SRT.

키워드

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