|Title||Enhanced methane production from rice straw co-digested with anaerobic sludge from pulp and paper mill treatment process|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2013|
|Authors||Mussoline, W., Esposito G., Lens P., Spagni A., and Giordano A.|
|Keywords||Alkalies, alkalinity, alternative energy, Ammonia, Anaerobic, Anaerobic digestion, Anaerobiosis, anoxic conditions, article, Atmospheric pressure, Biodegradation, biomass power, Bioreactors, Biotechnology, cellulose, Co-digestion, cobalt, Codigestion, controlled study, Copper, Digesters, Energy recovery, Environmental, Fatty acids, feasibility study, gas production, Hydrogen-Ion Concentration, Hydrolysis, industrial waste, Iron, laboratory, Lignin, Lignocellulosic, livestock farming, Manganese, methane, Nickel, Nitrogen, nitrogen concentration, nonhuman, Oryza sativa, Paper, Paper and pulp mills, Paper industry, Paper mill, Papermaking machinery, power generation, priority journal, pulp and paper industry, Pulp digesters, Pulps, Recovery, rice, sewage, sludge, Sludge digestion, straw, Time Factors, Trace elements, Volatile, volatile fatty acid, Waste treatment, waste water, waste water management, Wastewater, Zinc|
Rice straw is a widely available lignocellulosic waste with potential for energy recovery through anaerobic digestion. Lignin slows the hydrolysis phase, resulting in low methane recovery and long digestion periods. Although pretreatment is effective, it often requires high energy inputs or chemicals that are not feasible for farm-scale systems. This study investigates a unique co-digestion strategy to improve methane yields and reduce digestion times for farm-scale systems.By adding both piggery wastewater and paper mill sludge, specific methane yields in laboratory-scale digesters reached the theoretical value for rice straw (i.e. 330LNCH4/kgVS) over the 92-day period. Accelerated hydrolysis of the straw was directly related to the quantity of sludge added. The most stable digester, with sufficient buffering capacity and nutrients, contained equal parts of straw, wastewater and sludge. This approach is feasible for farm-scale applications since it requires no additional energy inputs or changes to existing infrastructure for dry systems. © 2013 Elsevier Ltd.
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