Effect of NaCl induced floc disruption on biological disintegration of sludge for enhanced biogas production

Bioresour Technol. 2015 Sep:192:807-11. doi: 10.1016/j.biortech.2015.05.071. Epub 2015 Jun 2.

Abstract

In the present study, the influence of NaCl mediated bacterial disintegration of waste activated sludge (WAS) was evaluated in terms of disintegration and biodegradability of WAS. Floc disruption was efficient at 0.03 g/g SS of NaCl, promoting the shifts of extracellular proteins and carbohydrates from inner layers to extractable--soluble layers (90 mg/L), respectively. Outcomes of sludge disintegration reveal that the maximum solubilization achieved was found to be 23%, respectively. The model elucidating the parameter evaluation, explicates that floc disrupted--bacterially disintegrated sludge (S3) showed superior biodegradability of about 0.23 (gCOD/gCOD) than the bacterially disintegrated (S2) and control (S3) sludges of about 0.13 (gCOD/gCOD) and 0.05 (gCOD/gCOD), respectively. Cost evaluation of the present study affords net profits of approximately 2.5 USD and -21.5 USD in S3 and S2 sludge.

Keywords: Biochemical methane potential; Disintegration; Extracellular polymeric substance; Floc disruption; Waste activated sludge.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacillus / classification
  • Bacillus / drug effects*
  • Bacillus / physiology*
  • Biodegradation, Environmental
  • Biofuels / microbiology*
  • Bioreactors / microbiology
  • Cell Aggregation / drug effects
  • Cell Aggregation / physiology
  • Methane / isolation & purification
  • Methane / metabolism*
  • Refuse Disposal
  • Sewage / microbiology*
  • Sodium Chloride / pharmacology*
  • Species Specificity

Substances

  • Biofuels
  • Sewage
  • Sodium Chloride
  • Methane