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۱semi–continuous anaerobic co–digestion of poultry manure and wheat straw:effect of loading
نویسنده(ها): ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۷
We studied the effect of loading on anaerobic co–digestion of poultry manure with straw. The mixture of poultry manure and straw has been experimentally evaluated in a complete–mix, lab–scale digester with working volume of 70 l and the effect of loading on the process wasinvestigated at 34°C and HRT of 15 days. Anaerobic co–digestion appeared feasible with a loading rate of 3.0 kgVS\m3.d. At this state, the specific methane yield was calculated about 0.12 m3\kgVS with a methane content in the biogas of 53–70.2% and the VS removal amounted 72%. At a higher or lower loading in the range from 1.0 to 4.0 kgVS\m3.d, the process appeared inhibited and\or overloaded, as resulted by the accumulation of volatile fatty acids with decreasing in pH and decline in the methane yield. The nitrogen in the feed, ca 5.6% of total solids (TS).<\div>

۲Effects of Temperature and Organic Loading Rates on the Biogas Yield of MSW Anaerobic Digester
نویسنده(ها): ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۷
The amount of municipal solid waste (MSW) generated in Iran is around 60000 ton\day of which more than 70% is organic wastes. The objective of this study was to optimize the applications of anaerobic digestion for the treatment of municipal organic wastes. In order to obtain basic designcriteria for anaerobic digester of MSW, the effect of different organic loading rates (OLR) and digesting temperatures were investigated. The study was made at pilot scale using 70l reactor. In the first part of the investigation, the digester was operated at different organic feeding rates of 1.4,2 and 2.75 kg VS\(m3.d). The biogas produced had methane composition of 49.7– 64% and biogas production rates of 0.12–0.4 m3\ (kg VS). The reactor showed stable performance with highest biogas production (0.4m3\kg VS) and VS reduction of around 88% during loading rate of 1.4 kg VS\(m3.d). VS removal and methane concentration in biogas was decreased when the organic loading rate was increased. In the second part of the investigation, digester temperatures were setbetween 25–34°C. Digestion with temperature in these range resulted in biogas yield of 0.23–0.33 m3biogas\ kg VS, with a methane content in the biogas of 52.4–62.6%. The methane content and yield decreased with reduction of digestion temperature. However this reduction was almost negligible from 34°C to 30°C. Based on the data obtained from this study, organic loading rates of1.4 kg VS\ (m3.d) and temperature in the range of 30–34°C is suggested as a base for design purpose.<\div>
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