Performance and activated sludge characteristics at short solid retention time in a submerged MBR: effects of C/N ratio of wastewater


Sarı Erkan H. , Engin G.

Environmental Technology, vol.40, no.1, pp.2085-2092, 2019 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 1
  • Publication Date: 2019
  • Doi Number: 10.1080/09593330.2018.1437223
  • Journal Name: Environmental Technology
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.2085-2092
  • Keywords: Membrane bioreactors, activated sludge, physico-chemical characteristic, short solid retention time, extracellular polymeric substances, MEMBRANE BIOREACTOR, NITROGEN RATIO, FILTRATION CHARACTERISTICS, POLYMERIC SUBSTANCES, ORGANIC-MATTER, BIOMASS, MICROFILTRATION, BIOFLOCCULATION, CARBON

Abstract

This study investigated the effect of carbon to nitrogen (C/N) ratio of influent wastewater on performance and activated sludge properties at a sludge retention time of 5 d in a submerged membrane bioreactor. The chemical oxygen demand and ammonia-Nitrogen (NH3-N) removal ef?ciencies were found to be over 96.3% and 86.9% in the sMBRs having different C/N ratios. It was found that total extracellular polymeric substances and total soluble microbial products increased with an increase in C/N ratio. It was also observed that critical flux, relative hydrophobicity and zeta potential values decreased, and capillary suction time, particle size and viscosity of sludge increased as the C/N ratio increased.