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Cow dung rich in lignocellulosic material present in it could be potentially used as a good carbon source for biogas production. The major component present in cow dung is cellulose (55%) and hemicellulose (25%), both of which can be used to produce biomethane by fermentation (Mandal and Durvasula 2000; Ray et al. 2001). The biogas potential of cow dung has been investigated by several workers. Ramachandran et al. (2014) reported that cow dung produced biogas with high methane yield in comparison to rice straw. Thus, cow dung could be used as a potential biogas source and thus a better option to coal or oil based fuels. In order to overcome the problem of co-digestion of cow dung with municipal solid waste, Jilani et al. (2013) carried out experiments of co-digestion of cow dung with municipal solid waste and cow dung showed higher biogas production (on an equal weight basis) in comparison to co-digestion of cow dung and municipal solid waste. Thus co-digestion of cow dung and cow dung rich in lignocellulosic material can be used as a good source of biogas.
The objective of the present review is to provide an insight in the area of utilisation of cow dung for energy, medicine, agriculture and environment based on scientific publications available in various databases and journals. It is expected that this review will provide a complete appraisal of the actual status and future prospects of cow dung utilisation.
Adams, J. A., J. L. Rios, J. M. Cazzone, C. K. Chung, D. R. Compton, S. Nandi, and K. C. Cameron. 2014. “The natural ability of cow dung microorganisms to degrade waterborne polycyclic aromatic hydrocarbons.” Sci. Total Environ.. 474:443-452.
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