PDF Publication Title:
Text from PDF Page: 041
variety of added substrates. Energy Production The quantity of energy produced from each gallon of waste processed is strictly a function of the percentage conversion of volatile solids to gas. Each pound of volatile solids destroyed will produce 5.62 cubic feet of methane. Each cubic foot of methane will contain 1000 Btu’s of energy. Therefore, each pound of volatile solids converted will produce 5620 Btu’s of energy. At 35 percent conversion efficiency, each pound of volatile solids destroyed will produce 0.58 kWh of energy. It is therefore important to look at the conversion efficiencies of the various anaerobic processes. As pointed out earlier, the conversion of volatile solids to gas is a function of the organic loading to the digester. Higher percentage conversions to gas are achieved at lower organic loadings. Low loadings however, translate into larger digestion facilities. However, it is possible to achieve a higher volatile solids conversion to gas by increasing the digester loading while maintaining a higher biomass concentration in the digester. In other words, the food to microorganism (F/M) ratio remains low resulting in a higher rate of conversion. The rate of volatile solids conversion to gas is related to the type of anaerobic digester used. Conventional completely mixed and plug flow digesters, which do not retain biomass, should have comparable volatile solids destructions. Anaerobic lagoons will have a lower rate of conversion, while high rate retained biomass reactors will have higher rates of solids conversion to gas. Each is discussed separately below. Conventional Digesters A review of recent dairy waste anaerobic digestion studies has established that most engineers anticipate a 50 percent conversion of volatile solids to gas. The planned Three-Mile Farm (Oregon) dairy waste thermophilic anaerobic digestion facility is expected to achieve a 50 percent volatile solids conversion to gas. The C. Bar M. (Idaho) plug flow anaerobic digester facility anticipated a 50 percent conversion of dairy waste volatile solids to gas. The recently completed Myrtle Point (Oregon) feasibility study utilizing the gravity separation contact process anticipated a 50 percent conversion of dairy waste volatile solids to gas. Relatively high loading rates were anticipated in each case. The organic loading rates varied between 5.6 and 6.4 kg per cubic meter per day. The available literature does not support such high volatile solids conversions to gas at high organic loading rates. A summary is as follows: The Monroe Honor Farm (Ecotope 1979) completely mixed anaerobic digester achieved a maximum of 40 percent volatile solids conversion to gas at a loading © Environmental Energy Company 38 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
PDF Search Title:
Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy ManureOriginal File Name Searched:
biogas11.pdfDIY PDF Search: Google It | Yahoo | Bing
Capstone Turbine and Microturbine: Capstone microturbines used and new surplus for sale listing More Info
Consulting and Strategy Services: Need help with Capstone Turbine, sizing systems, applications, or renewable energy strategy, we are here to assist More Info
Container Lumber Dry Kiln: Since 1991 developing and innovating dry kilns using standard shipping containers More Info
Supercritical CO2 Lumber Dry Kiln: Compact fast drying in 3 days or less for small amounts of wood and lumber drying More Info
BitCoin Mining: Bitcoin Mining and Cryptocurrency... More Info
Publications: Capstone Turbine publications for microturbine and distributed energy More Info
FileMaker Software for Renewable Energy Developing database software for the renewable energy industry More Info
CO2 Gas to Liquids On-Demand Production Cart Developing a supercritical CO2 to alcohol on-demand production system (via Nafion reverse fuel cell) More Info
Stranded Gas for low cost power Bitcoin Mining Using stranded gas for generators may provide breakthrough low power costs for cryptocurrency miners. More Info
CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com (Standard Web Page)