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Enhance volatile fatty acid (VFA) and bio-methane productivity by pretreatment of lawn grass

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

Citation:  Paper number  131604035,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131604035) @2013
Authors:   Liang Yu, Jingwei Ma, Quanbao Zhao, Craig Frear, Shulin Chen
Keywords:   Anaerobic digestion pretreatment volatile fatty acid bio-methane lawn grass.

Abstract. Lawn grass is a huge potential source of bio-fuel production because there are 27.6 million acres of turf grass in U.S., and 21 million acres in home lawns. Anaerobic digestion (AD) of lawn grass is an effective way to produce bio-methane, and to reduce the strain on the environment from greenhouse gases and overcrowded landfills. The potential bioconversion of carbohydrates in this potential resource, however, is limited by the associated cellulose and hemicellulose within the grass fiber. These constitutes must be broken down into their corresponding monomers (sugars), so that microorganisms can efficiently utilize them. To establish an efficient AD system, three pretreatments including ozone, soaking aqueous ammonia (SAA), and a combination of ozone and soaking aqueous ammonia (OSAA) optimized in our group were investigated to enhance volatile fatty acid (VFA) and bio-methane productivity of Kentucky bluegrass (Poa pratensis L.). Sodium 2-bromoethanesulfonate was used to inhibit methanogenic bacteria for studying VFA production. The results showed that the ammonia pretreatment was the most effective way to accelerate VFA and bio- methane production rate of kentucky bluegrass. These results would suggest that aqueous ammonia reused from our developed nutrient recovery system will reduce the cost of pretreatment.

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