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Water Res

Title:		Anaerobically digested biosolids odor generation and pathogen indicator regrowth after dewatering
Author(s):		Chen YC; Higgins MJ; Beightol SM; Murthy SN; Toffey WE;
Address:		"Environmental Engineering Program, Penn State Harrisburg, Middletown, PA 17057, USA. yuc12@psu.edu"
Journal Title:		Water Res
Year:		2011
Volume:		20110219
Issue:		8
Page Number:		2616 - 2626
DOI:		10.1016/j.watres.2011.02.014
ISSN/ISBN:		1879-2448 (Electronic) 0043-1354 (Linking)
Abstract:		"The objective of this research was to investigate whether a preferential stimulation of microorganisms in anaerobically digested biosolids can occur after dewatering and if it can lead to pathogen indicator regrowth and odor generation upon storage. Laboratory incubation simulating biosolids storage indicates that both odorant generation, based on total volatile organic sulfur compound concentrations (TVOSCs) and pathogen indicator regrowth, based on fecal coliform densities follow similar formation and reduction patterns. The formation and reduction patterns of both odor compounds and fecal coliforms imply that groups of microorganism are induced if shearing disturbance is imposed during dewatering, but a secondary stabilization can be achieved soon after 1-2 weeks of storage. The occurrence of the induction is likely the microbial response to substrate release and environmental changes, such as oxygen, resulting from centrifuge shearing. The new conditions favor the growth of fecal coliforms and odor producing bacteria, and therefore, results in the observed fecal coliforms regrowth and odor accumulation during subsequent storage. However, when both substrate and oxygen deplete, a secondary stabilization can be achieved, and both odor and fecal coliforms density will drop"
Keywords:		"Anaerobiosis Bacteria/*growth & development Colony Count, Microbial Desiccation Methane/analysis Odorants/*analysis Volatile Organic Compounds/analysis *Waste Disposal, Fluid Water/*chemistry;"
Notes:		"MedlineChen, Yen-Chih Higgins, Matthew J Beightol, Steven M Murthy, Sudhir N Toffey, William E eng Research Support, Non-U.S. Gov't England 2011/03/11 Water Res. 2011 Apr; 45(8):2616-26. doi: 10.1016/j.watres.2011.02.014. Epub 2011 Feb 19"