Article ID Journal Published Year Pages File Type
4997653 Bioresource Technology 2017 37 Pages PDF
Abstract
Anaerobic digestion is the most cost effective technology for sustainable biogas production from rice straw. Rice straw was subjected to ambient pretreatment with alkali and subsequently digested anaerobically. A dimensional equation was developed to predict the efficacy of alkali treatment in terms of soluble COD. Biomethanation process parameters like temperature, initial pH, particle size, substrate/inoculum ratio, trace element supplementation, C/N ratio and hydraulic retention time were optimized. The highest biogas production under optimized conditions was 514 L/kg VS/day (∼59% CH4) from milled rice straw (1 mm) pretreated with sodium hydroxide (1% w/v) at ambient temperature for 180 min. The digester was operated at 15 days HRT at 37 °C and neutral pH. C/N ratio was optimized at 25 using urea. Higher biogas yield from rice straw treated with lower concentration of NaOH at ambient temperature may make this process more economical than the previous reports.
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Physical Sciences and Engineering Chemical Engineering Process Chemistry and Technology
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