Journal
WASTE AND BIOMASS VALORIZATION
Volume 11, Issue 11, Pages 5665-5678Publisher
SPRINGER
DOI: 10.1007/s12649-019-00874-9
Keywords
Spent tea waste; Cow manure; Fuzzy logic; Biogas; Mamdani approach; Regression analysis
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Modelling and optimization of production of different renewable energy sources are receiving great interest by researchers; as they are used to provide gross information on the possibilities of harnessing energy from variety of resources. Spent tea waste (STW) is one of the potential organic wastes remarkably available in India. In this research work, possibility of producing biogas by co-digesting STW with cow manure (CM) was predicted through a novel fuzzy regression approach. Triangular membership functions with five levels were considered for the fuzzy subsets and a Mamdani-type of fuzzy approach was used to implement a total of 125 rules in the IF-THEN format. The digestion time, carbon to nitrogen (C/N) ratio and pH were considered as input parameters, while the biogas yield was considered as an output. Experimental data obtained from the lab scale reactors were used to predict the biogas yield using fuzzy logic methodology. The obtained results were validated with the experimental results by carrying out a regression analysis. The results indicated that a good agreement found between experimental and predicted data with a coefficient of determination R-2 = 0.994. [GRAPHICS] .
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