Organic matter extracted from activated sludge with ammonium hydroxideand its characterization
Liangliang Wei , Kun Wang , Qingliang Zhao , Junqiu Jiang , Chunmei Xie , Wei Qiu
DOI:
Received November 02, 2009,Revised January 08, 2010, Accepted , Available online
Volume 22,2010,Pages 641-647
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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.
