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SUMMARY REPORT: IN-VESSEL COMPOSTING OF MUNICIPAL WASTEWATER SLUDGE
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Impact/Purpose:
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Description:
This 177-page Technology Transfer Summary Report highlights design and operating considerations for possible incorporation into future in-vessel and other sludge composting systems. It is not meant to single out one design as superior to another. The document also aims to heighten awareness that a sludge in-vessel composting system includes much more than the vessel itself. Indeed, many of the difficulties encountered at in-vessel facilities have resulted from a failure to recognize the totality of the system that must be managed. This summary report is divided into 13 chapters. Chapter one presents the purpose and content of the report, an introduction to how the surveys were conducted , and an overview of in-vessel composting. Chapters two, three, and four summarize the lessons learned from the successes and failures of the sites visited. These chapters also present problems encountered during the processes of selecting, procuring, designing, and operating an in-vessel composting facility, as well as solutions developed in response to these problems. Chapter five through thirteen present detailed information on the plants visited. Chapter five introduces the case studies and includes tables that summarize the information gathered during the onsite investigations. Chapters six through thirteen present eight case studies, including a detailed description of each plant and information on the history, performance, and operations of the facilities. The historical background is presented to provide a context for the site visit information, but the factual data (such as mix ratios, loading rates, and operating practices) are accurate only for the time of the site visit.