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A two-phase anaerobic process to produce hydrogen and methane from swine manure was investigated, using pretreated sludge with heat, acid and alkali treatment as inoculum. The relative order of pretreatment methods of H 2 productivity effectiveness and CH 4 productivity effectiveness produced by the residua of the first phase was heat treatment>alkali treatment>acid treatment...
Volatile fatty acids (VFAs) are important mid-products in the production of methane, and their concentrations affect the efficiency of fermentation. However, their effects on methane yield and methanogenic bacteria growth have been less extensively studied. To address these effects, acetic acid, propionic acid, butyric acid and ethanol were used as substrates and an L 9 (3 4 ) orthogonal...
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