SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (2): 429-439.DOI: 10.1016/j.cjche.2019.06.005

• Separation Science and Engineering • Previous Articles     Next Articles

Insights into membrane fouling implicated by physical adsorption of soluble microbial products onto D3520 resin

Ruyi Cao, Juanjuan Zhou, Weiwei Chen   

  1. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
  • Received:2019-02-25 Revised:2019-05-19 Online:2020-05-21 Published:2020-02-28
  • Contact: Weiwei Chen
  • Supported by:
    This work was financially supported by the Inner Mongolia Natural Science Foundation of China (No. 2016BS0205) and the Scientific Research Foundation of the Inner Mongolia University of Technology of China (No. ZD201505).

Insights into membrane fouling implicated by physical adsorption of soluble microbial products onto D3520 resin

Ruyi Cao, Juanjuan Zhou, Weiwei Chen   

  1. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
  • 通讯作者: Weiwei Chen
  • 基金资助:
    This work was financially supported by the Inner Mongolia Natural Science Foundation of China (No. 2016BS0205) and the Scientific Research Foundation of the Inner Mongolia University of Technology of China (No. ZD201505).

Abstract: Membrane fouling is a major problem in membrane bioreactors (MBRs). In this study, membrane fouling caused by membrane rejection and adsorption was study. Filtration tests indicated that membrane rejected SMP, causing membrane pore blockage and then forming a gel layer. Batch adsorption experiments showed that adsorption of SMP onto PVDF membrane was a spontaneous physical adsorption process.
Meanwhile, the absolute value ΔG of adsorption of SMP onto D3520 was higher than that of adsorption of SMP onto PVDF membrane, so SMP preferentially adsorbed onto D3520 rather than PVDF membrane. Thus, the effect of ARs on reducing the SMP concentration was investigated. It was found that, 6 g of D3520 was suitable for adsorption of SMP. This physical adsorption involved external film diffusion, intra-particle diffusion, and surface adsorption. The Redlich-Peterson isotherm model performed best in terms of describing this equilibrium data. The mechanism of membrane fouling mitigation was verified by MBR simulation system. A case study of AR-MBR system was conducted. The results showed that addition of D3520 can effectively alleviate the development of membrane fouling.

Key words: Adsorption resin, Soluble microbial products, Membrane fouling, Membrane bioreactors

摘要: Membrane fouling is a major problem in membrane bioreactors (MBRs). In this study, membrane fouling caused by membrane rejection and adsorption was study. Filtration tests indicated that membrane rejected SMP, causing membrane pore blockage and then forming a gel layer. Batch adsorption experiments showed that adsorption of SMP onto PVDF membrane was a spontaneous physical adsorption process.
Meanwhile, the absolute value ΔG of adsorption of SMP onto D3520 was higher than that of adsorption of SMP onto PVDF membrane, so SMP preferentially adsorbed onto D3520 rather than PVDF membrane. Thus, the effect of ARs on reducing the SMP concentration was investigated. It was found that, 6 g of D3520 was suitable for adsorption of SMP. This physical adsorption involved external film diffusion, intra-particle diffusion, and surface adsorption. The Redlich-Peterson isotherm model performed best in terms of describing this equilibrium data. The mechanism of membrane fouling mitigation was verified by MBR simulation system. A case study of AR-MBR system was conducted. The results showed that addition of D3520 can effectively alleviate the development of membrane fouling.

关键词: Adsorption resin, Soluble microbial products, Membrane fouling, Membrane bioreactors