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Item Information   Holdings       More by this author     Gitter, Michael L.     Subjects     Sewage sludge digestion     Sewage -- Purification -- Biological treatment     Sanitary microbiology     Refuse and refuse disposal     MSEV Project.     Browse Catalog     by author:      Gitter, Michael L.       by title:      An assessment of tem...         MARC Display

An assessment of temperature phased anaerobic digestion for the production of Class A biosolids / by Michael L. Gitter. by Gitter, Michael L. Subjects Sewage sludge digestion   Sewage -- Purification -- Biological treatment   Sanitary microbiology   Refuse and refuse disposal   MSEV Project. Description:  109 leaves : ill. ; 28 cm. Contents:  Advisor: Dr. Francis Mahuta Committee members: Kenneth Kaszubowski, Jeffrey MacDonald Introduction -- Literature review -- Bench-scale testing methodology -- Technical performance results and discussion -- Conclusions -- References -- Appendix A) Thermal issues B) Life cycle cost analysis C) Process detention time. Publicly Owned Treatment Works (POTWs) are being subjected to increasing regulatory, political, and social pressures to produce a "safe" biosolids product. Biosolids are a significant source of needed nutrients for plant and crop growth. The Brookfield Fox River Water Pollution Control Center (FRWPCC) currently produces a Class B biosolids product, which contains a significant density of pathogenic organisms. The objective of this project is to utilize temperature phased anaerobic digestion (TPAD) treatment to meet Class A biosolids requirements. Currently, the high pathogen concentration in the FRWPCC biosolids is the only condition prohibiting Class A status. The experimental process was conducted in three sequential phases. The intent in Phase I was to environmentally adapt four laboratory-scale primary anaerobic digesters, with two operated as mesophilic temperature reactors (35 C) and two as thermophilic temperature reactors (55C). Phase I was concluded when monitoring suggested that microcosm stabilization had been achieved. Phase II instituted phasing of the process in both modes (i.e. mesophilic-thermophilic and thermophilic-mesophilic). This phase achieved Class A pathogen reduction success and demonstrated that the thermophilic-mesophilic mode was operationally preferred based on increased volatile solids reduction and organic loading capacity. These findings translate into reduced biosolids generation volume, increased treatment capacity, and higher methane gas production, which is available as an alternate fuel source. The intent of Phase III was to fine-tune the operational boundaries in regard to temperature and loading of organic matter. This phase concluded that TPAD offers the ability to stabilize organic matter with greatly reduced solids retention times than traditional mesophilic anaerobic digestion while still producing a socially acceptable resource.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .G58 2002 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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