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Effects of varying the ratio of cooked to uncooked potato on the microbial fuel cell treatment of common potato waste.
Science of the Total Environment 2016 November 2
The effect of varying the ratio of cooked to uncooked potato in the performance of microbial fuel cell (MFC) treating common potato waste was investigated. Four MFCs were fed with a ratio of cooked (boiled) to uncooked (i.e. waste) potato of 0, 48.7, 67.3 and 85.6%. Respectively, the columbic efficiency was estimated as 53.5, 70.5, 92.7 and 71.1%, indicating significantly enhanced electricity generation and waste degradation at an initial feedstock mixing ratio of 2/3 cooked to 1/3 uncooked potato. The hydrolysis rate parameter (estimated using a first-order sequential hydrolysis and degradation model) increased from 0.061 to 0.191day(-1) as cooked potato was added which increased electricity generation efficiency from 24.6 to 278.9mA/m(2)/d and shortened the startup time for maximum current density from 25 to 5days. The potato slurries' chemical oxygen demand (COD) decreased by 86.6, 83.9, 84.1 and 86.3%, respectively, indicating no relationship exists between the fraction of boiled potato and the amount of COD reduction.
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