Progress 10/01/02 to 09/30/03
Outputs
Research was conducted on the tedhnical and economical feasibilities of producing energy and compost from dairy manure waste in the dry New Mexico Climate. A batch method was used, where soild manure which is collected once a day was placed in a batch reactor. The batch reactor was activitated by recycling leachate from the solid manure batch into a fixed film methane reactor and back to the soild phase. The recirculation resulted in seeding of the solid batch within 7 to 10 days after which the manure batch begin producing methane gas at the rate of 0.3 m3 of biogas per m3 of reactor. The concentration of methane in the biogas was between 50-65 percent. The biogas production from the batch continues until the digestable organic is depleted. The process takes 4 to 6 weeks at which time about 60% of the original manure remains as residual compost.
Impacts
THe expected impact is a potential technology for dry climates where soild manure can be converted to biogas and soil amendment. The conversion of manure waste to renewable energy and compost is economically feasible.
Publications
- Zohrab Samani, Adrian Hanson, G. Smith. Producing energy from combined agricultural waste. 4th International Conference on anaerobic digestion, Munich, Germany, Oct. 2002.
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Progress 10/01/00 to 09/30/01
Outputs
Research was conducted to evaluate the potential conversiuon of feedlot manure waste into methane gas. Two-phase anaerobic digestion system was used where water was recirculated through solid manure to achieve hydrolysis and acidification. The enriched solution was transferred through methane columns to convert the fatty acids into methane gas. Two experiemts were conducted during 2001. The first experiment was with pure manure collected from a manure seperator from a nearby dairy. The manure produced 66 cubic meters of STP methane gas per ton of manure used (dry weight). The duration of conversion was two weeks. manure weight reduction of 40% was achieved during the experiment. The second experiment was conducted using a mixture of manure, grass and cotton gin waste. The mixture was about 50% manure and 50% cotton gin and grass. The duration of conversion was two weeks and STP methane production rate was 60 cubic meters of STP methane per dry ton of waste. The weight
reduction was 60 percent.
Impacts
Significant amount of manure waste is generated from livestock industry every year. The manure waste is currently a finacial liability for milk producers in Southern New Mexico. The New Mexico Dairy associatyion is interested in assessing the feasibilty of converting the manure waste into methane energy. To assess the technical and economical feasibility of such process, design parameters are needed to evaluate the size of reactor necessary to run an electric generator and economic return from such operation. The current research is aimed at developing the necessary design parameters for such operation.
Publications
- Yu, H. W., Z. Samani, A. Hanson, G. Smith. Enhanced Energy production and compost generation with Cattle Manure. EPA/WEF Sympoosium on Innovative Proceses to Produce Useful Materials and Energy from Biosolids and Animal Manure, Chicago. Il, June 2001.
- Z. Samani, H. W. Yu, A. Hanson. Enerfy production from municipal and agricultural waste using Bi-Phsasic anaerobic digestion. Proceedings of 9th World Congress on Anaerobic Digestion 2001. September 2-6, Belgium.
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