Type of Document Master's Thesis Author Vining, Michael Alden Author's Email Address firstname.lastname@example.org URN etd-1101102-142703 Title Bench-Scale Compost Reactors System and the Self-Heating Capabilities Degree Master of Science (M.S.) Department Civil and Environmental Engineering Advisory Committee
Advisor Name Title Donald Dean Adrian Committee Chair John H. Pardue Committee Member Kyoung S. Ro Committee Member W. David Constant Committee Member Keywords
Date of Defense 1998-10-16 Availability unrestricted AbstractLess expensive bench-scale composting reactor systems which can mimic actual composting process via self-heating are needed. One can achieve such systems without using the expensive temperature feed-back control by properly insulating the bench composting reactors. However, the knowledge of heat generation and transfer in bench composting reactors is essential in properly designing such inexpensive insulation systems.
All compost trial temperature profiles illustrated initial elevated temperature levels followed by a slow gradual temperature decreasing phase. Of all of the variables, the airflow rate, the volume and the overall heat transfer coefficient, seem to have the greatest impact on producing thermophilic temperatures.
From the data obtained from the experiments, some design criteria are suggested. An air flow rate of 1 m3/(kg-VS-d), an heat transfer coefficient less than .010 J/(m2-K-d), and a compost volume of ten liters or greater value are parameter guidelines for future research. The guideline of moisture content equal to or greater than 30% held.
With the experiments being a success in producing self-heating elevated temperatures, it is obvious that the precise parameters necessary are still vague. Additional future study is needed to specify the parameters necessary for optimal composting. A better understanding of composting kinetics, energy values of compost components, and mass transfer during water evaporation is needed.
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