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The scarcity of conventional energy sources and their environmental impacts have led to successful implementation of biogas technologies in various applications. However, the lack of awareness in the society and economic viability are a few constraints that hinder the effective use of biogas in many sectors. Therefore, intensive research is needed to overcome the above said issues and extend the use of biogas into many newer avenues. Academic institutions are the places where people have more awareness on the environmental impacts. However, the nonuniform availability of biowastes and the lack of studies on the economic benefits of this technology restrict the implementation of the same. This study focuses on the economic benefits of implementing three types of biogas digesters, KVIC, JANATA, and Fiber‐glass reinforced polyester biogas plants, in five different academic institutions where the student population and generation of biowastes throughout a year are nonuniform, and the digester may not run with full load continuously. Based on a pilot study, the quality and quantity variations because of the nonuniform strength of student during a year have been studied and the same have been used to predict the biogas generation in the selected institutions. The result shows that biogas energy production is economically viable for capacities ranging from 25 to 450 m3 with a payback period between 3.18 and 7.59 years for various types used in the study. The economic viability of the biogas plants is proved with positive net present value. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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In the present investigation, a detailed experimental study is carried out on a conventional single slope solar still with sand heat energy storage for improving the yield of fresh water. Yield of the solar still depends on the type of energy storage material used in the basin. Yield of the present study is compared with the solar still without any storage medium. Similarly, mathematically correlations of yield as a function of water and basin temperature were depicted. The results show that the use of sand as energy storage in cuboidal boxes the yield of solar still has improved by 145% than that of conventional single slope solar still. The total yield from the solar still with and without energy storage materials was found to be 5.1 and 1.9 kg/m2day respectively.