Aquatic environment

Organic matter extracted from activated sludge with ammonium hydroxideand its characterization

Liangliang Wei , Kun Wang , Qingliang Zhao , Junqiu Jiang , Chunmei Xie , Wei Qiu


Received November 02, 2009,Revised January 08, 2010, Accepted , Available online

Volume 22,2010,Pages 641-647

  • Summary
  • References
  • Related Articles
In order to characterize the organic properties of waste activated sludge in a wastewater treatment plant, organic matter within sludge was extracted with NH3 H2O preferentially, and subsequently fractionated into five fractions using XAD-8/XAD-4 resins. Up to a 63.8%–71.1% of organic matter within the sludge could be e ciently extracted by NH3 H2O. Fractionation results showed that hydrophobic acid and hydrophilic fraction were two main components among the sludge organic matter (accounting for 32.2% and 48.0% of the bulk organic matter, respectively), whereas transphilic acid, hydrophobic neutral and transphilic neutral were quite low (accounting for 9.2%, 5.8% and 4.8%, respectively). Despite that the extractant of NH3 H2O showed a relatively higher extraction e ciency of the aromatic components, the relatively low aromaticity of the organic fractions implied that those non-aromatic components could also be e ectively extracted, especially for neutral and hydrophilic fractions. In addition, acidic fractions contained more aromatic humic-like components, whereas the neutral fractions had a greater content of aromatic proteins and soluble microbial byproduct-like components. Extraction of sludge organics with NH3 H2O and subsequential fractionation using XAD resins could be a novel method for further characterization of sludge organics.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3