@article {27287,
	title = {Characterization of Sulfur in Raw and Anaerobically Digested Municipal Wastewater Treatment Sludges},
	journal = {Water Environment Research },
	volume = {85},
	year = {2013},
	abstract = {A microwave-enhanced acid digestion method that was integrated with inductively coupled plasma-atomic emission spectrometry was developed and validated for determining total, soluble, and precipitated sulfur in wastewater treatment sludges. The coefficient of variation of this method was less than 4.0\%. The recovery of dosed sulfur from sludge samples was between 97.1\% and 100.5\%. The composition of sulfur in primary and waste-activated sludge (WAS) before and after anaerobic digestion at 35 and 55 {\textdegree}C was characterized by employing this developed method. There was not an apparent relationship between the precipitated sulfur and nonsoluble iron concentrations in sludges. Raw WAS had a more consistent organic sulfur fractionation because of its relatively homogeneous composition. The organic-sulfur-containing components (proteins) of WAS had reduced degradability as compared with that in primary sludge during anaerobic digestion. Digestion at 55 {\textdegree}C increased solubilization but not ultimate conversion of organic sulfur in sludge.},
	author = {Wayne Parker and Weiwei Du}
}
