Abstract
Hydrogen is the richest element in energy per unit of mass that exist. The challenge nowadays is its handling for different usages, as biogas upgrading. This research aims to study the behaviour of biogas upgrading with photovoltaic in-situ hydrogen generation with different type of substrates. It operates into batch reactors with 85 % of humidity of the mixture, with stainless steel electrodes at a controlled direct current voltage of 1.2 V at 38 °C, using pig slurry, chicken dung and rabbit poop (p > 0.05). Results showed a hydrogen generation during the process of 0.13 mol, 0.21 mol and 0.192 mol for pig slurry, chicken dung and rabbit poop, respectively. Leading to energy balance and energy recovery efficiency of 302.24 Wh.kg−1 and 12.45 %, 596.53 Wh.kg−1 and 19.99 %, and 1158.84 Wh.kg−1 and 30.33 % for pig slurry, chicken dung and rabbit poop, respectively. This upgrading technique improved biomethanization, but varied depending on substrate chemical characteristics involved.
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