ISU CE 421 - Pre-Treatment Technologies (9 pages)

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Pre-Treatment Technologies



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Pre-Treatment Technologies

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Pages:
9
School:
Iowa State University
Course:
Ce 421 - Environ Biotechnolg

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Pre Treatment Technologies for Increasing the Biogas Potential of Agricultural Wastes T A Shepherd 15 November 2006 Abstract Anaerobic digestion AD is a common wastewater treatment method employed in municipal industrial and agricultural systems AD requires a receiving stream with low total solids TS content typically less than 8 Low TS influent facilitates optimal conditions for microbial degradation and reduces operational cost that is associated with increased energy consumption for wastewater with high TS Animal manures especially beef manure generally contain higher levels of solids that municipal and industrial wastewaters this can limit the application of anaerobic digestion as a treatment option Pre treatment strategies have been employed in municipal and industrial systems to disrupt conglomerated solids and breakdown cell structures this facilitates the reduction of TS content and has been shown to improve AD performance and increase the bio methane potential Investigations of pre treatment methods have focused primarily on municipal and industrial systems their application to agricultural systems may provide producers with an improved waste treatment system that is capable of handling higher solid influents This paper will discuss maceration thermal hydrolysis chemical amendment liquefaction sonication and ozonation as pretreatment methods for optimizing anaerobic digestion and investigate their application within agricultural systems Key Words Anaerobic Digestion Agricultural Wastewater Pre treatment Maceration Thermal Hydrolysis Chemical Treatment Liquefaction Sonication Ozonation Introduction Conservation and management of nutrients and resources is becoming an essential factor of sustainable agriculture today Growing concerns of water quality and land management have introduced new factors for the treatment and distribution of agricultural wastes Government regulations on land application of animal manures present and pending will have a large impact



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