Impact of the excess sludge modification with selected chemical reagents on the increase of dissolved organic substances concentration compounds transformations in activated sludge

Environ Res. 2017 Jul;156:652-656. doi: 10.1016/j.envres.2017.04.033. Epub 2017 May 5.


Submission of excess sludge initial disintegration process significantly affects the efficiency of anaerobic stabilization process. Expression of increasing the concentration of organic matter in dissolved form is to increase sludge disintegration. As a result of chemical modification is an increase of the chemical oxygen demand and the concentration of volatile fatty acids. The aim of this study was to determine the impact of the disintegration process with selected chemical reagents to increase the concentration of organic substances in dissolved form. The process of chemical disintegration of excess sludge was treated using the following reagents: Mg(OH)2, Ca(OH)2, HCl, H2SO4, H2O2. The modification was carried out at ambient temperature for 2, 6 and 24h. During sludge disintegration it was noticed the growth of indicators values that confirmed the susceptibility of prepared sludge to biodegradation.

Keywords: Chemical disintegration; Chemical oxygen demand; Excess sludge; Volatile fatty acids.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biological Oxygen Demand Analysis
  • Calcium Hydroxide / chemistry
  • Fatty Acids, Volatile / analysis
  • Hydrochloric Acid / chemistry
  • Hydrogen Peroxide / chemistry
  • Magnesium Hydroxide / chemistry
  • Oxidants / chemistry
  • Sewage / analysis
  • Sewage / chemistry*
  • Sulfuric Acids / chemistry
  • Waste Disposal, Fluid / methods*


  • Fatty Acids, Volatile
  • Oxidants
  • Sewage
  • Sulfuric Acids
  • Hydrogen Peroxide
  • Magnesium Hydroxide
  • sulfuric acid
  • Calcium Hydroxide
  • Hydrochloric Acid