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Selective digestion of industrial potato wastes for efficient biomethanation: a sustainable solution for safe environmental disposal

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Abstract

Potato being the staple vegetable in India is widely cultivated and processed for different value additions. During processing of potato, a huge amount of waste is generated in the form of peel and meat (mash). These wastes constitute a potential feedstock for biogas generation. The present study is focused on mitigation of acidogenesis that occurs during early stages of anaerobic digestion (AD) of potato waste which eventually inhibits the process of methanogenesis. A novel strategy of selective digestion was adopted in which the leachate and solid slurry resulting from the first stage digestion were further subjected to second stage by separating the solid and liquid phases. The obtained results indicated that stepwise digestion enhanced biomethane yield with an increase in methane percent from 46.47 to 60.4 % and reduction in total COD to about 94 %. Another novel strategy adopted in this study was the use of specifically developed microbial consortia for AD of potato wastes instead of conventional inoculum for production of biogas. The obtained yield is at par with the conventional inoculums which suggests that the developed consortia could act as potential substitute. The present study paves the way for sustainable utilization of industrial potato wastes for bioenergy production by overcoming the problems associated with conventional processes.

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Acknowledgments

Authors would like to acknowledge DST-TIFAC, New Delhi, Government of India, for financial assistance (Sanction No.: B&/04/001/11/TIFAC, dated 21/09/2011) to carry out this research work. Authors would like to thank M/s. Basukinath Food Processors Ltd., for providing the potato wastes which has been used as a raw material for the present study.

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Authors and Affiliations

  1. Microbial Biotechnology and Downstream Processing Laboratory, Indian Institute of Technology, Kharagpur, West Bengal, India

    S. Jacob & R. Banerjee

  2. Advanced Technology Development Centre, Indian Institute of Technology, Kharagpur, West Bengal, India

    A. D. Chintagunta

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  1. S. Jacob
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  2. A. D. Chintagunta
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Correspondence to R. Banerjee.

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Jacob, S., Chintagunta, A.D. & Banerjee, R. Selective digestion of industrial potato wastes for efficient biomethanation: a sustainable solution for safe environmental disposal. Int. J. Environ. Sci. Technol. 13, 2363–2374 (2016). https://doi.org/10.1007/s13762-016-1051-y

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  • DOI: https://doi.org/10.1007/s13762-016-1051-y

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