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Appl Biochem Biotechnol

Title:		Combined mesophilic anaerobic and thermophilic aerobic digestion process: effect on sludge degradation and variation of sludge property
Author(s):		Cheng J; Ji Y; Kong F; Chen X;
Address:		"School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou, China, jiehong514@hotmail.com"
Journal Title:		Appl Biochem Biotechnol
Year:		2013
Volume:		20130831
Issue:		7
Page Number:		1701 - 1714
DOI:		10.1007/s12010-013-0453-2
ISSN/ISBN:		1559-0291 (Electronic) 0273-2289 (Linking)
Abstract:		"One-stage autothermal thermophilic aerobic digestion (ATAD) is effective for the reduction of volatile solids (VSs) and pathogen in sewage sludges. A novel process of combining mesophilic (<35 degrees C) anaerobic digestion with a thermophilic (55 degrees C) aerobic digestion process (AN/TAD) occurred in a one-stage digester, which was designed for aeration energy savings. The efficiency of sludge degradation and variation of sludge properties by batch experiments were evaluated for the AN/TAD digester with an effective volume of 23 L for 30 days compared with conventional thermophilic aerobic digestion (TAD). The AN/TAD system can efficiently achieve sludge stabilization on the 16th day with a VS removal rate of 38.1 %. The AN/TAD system was operated at lower ORP values in a digestion period with higher contents of total organic compounds, volatile fatty acids, protein, and polysaccharide in the soluble phase than those of the TAD system, which can rapidly decreased and had low values in the late period of digestion for the AN/TAD system. In the AN/TAD system, intracellular substances had lysis because of initial hydrolytic acidification"
Keywords:		Aerobiosis Ammonia/metabolism Anaerobiosis Hydrogen-Ion Concentration Nitrates/metabolism Nitrogen/metabolism Oxidation-Reduction Polysaccharides/metabolism Proteins/metabolism *Sewage *Temperature Time Factors Volatilization;
Notes:		"MedlineCheng, Jiehong Ji, Yuehong Kong, Feng Chen, Xian eng Research Support, Non-U.S. Gov't 2013/09/03 Appl Biochem Biotechnol. 2013 Dec; 171(7):1701-14. doi: 10.1007/s12010-013-0453-2. Epub 2013 Aug 31"