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WASTE TO ENERGY: FIXED BED GASIFICATION OF FEEDLOT AND CHICKEN LITTER BIOMASS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  034135,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13887) @2003
Authors:   S. Priyadarsan, K. Annamalai, J. M. Sweeten, M. T. Holtzapple, S. Mukhtar
Keywords:   Feedlot biomass, chicken litter biomass, fixed-bed, gasification, and renewable energy

In the US, the cattle industry is a $175 billion industry with an estimated 100 million cattle. At the same time the US poultry industry is the world largest producer and exporter of poultry meet. Not surprisingly, the outcome of such large manufacturing units is the production of large quantity of byproducts in the form of wastes with approximately 200 million tons of dry cattle waste being produced annually. This review provides a method of generating energy from the feedlot and chicken litter waste. High-ash (around 45% weight basis) feedlot biomass and chicken litter biomass were gasified in a 10 kWt fixed bed counter current atmospheric pressure gasifier to generate a mixture of combustibles gases which could be further burned to generate heat. In this review the effect of biomass particle size on the composition of the product gas leaving the gasifier, the temperature profiles in the fixed bed, and the ash fusion of the feedlot biomass and chicken litter biomass during gasification are discussed. The gasification yielded a low-Btu gas with a heating value in the range of 4.0 4.8 MJ/m3. The experimental results show that high-alkaline content fuels, like litter biomass (LB) can be gasified by blending with lower-alkaline content fuels like high-ash feedlot biomass (HFB), to reduce the agglomeration in the bed without significantly affecting the heating value of the product gas. The gasification of highash LB and HFB not only yields a low-Btu gas, but also reduces the animal waste disposal problem.

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