A laboratory experiment was carried out to determine the effect of landfill bioreactor with additives of fly ash and cinder, leachate recirculation, and pH adjustment on the disposal municipal solid waste. Four simulators were used with one sanitary landfill and three landfill bioreactors. The results showed that landfill bioreactors can significantly enhance the biodegradation and upgrade the biostablization, and the leachate recirculation and pH adjustment in the bioreactor had a positive effect on municipal solid waste degradation. The landfill bioreactors could increase 11.7% landfill space and reduce the concentration of chemical oxygen demand concentration in leachate by over 60% than a sanitary landfill.
The aim of this research was a lab scale study of the influence of calcium and iron supplementations on the yield of methane in batch anaerobic digester treating dairy manure under mesophilic conditions. A gas chromatography analyzer was used to find the percentage of the methane in biogas. Results obtained indicate that both calcium and iron have a positive effect on methane yield. Calcium supplementation up to 200 mg L 1 with an organic loading rate of 60 g L 1 and calcium supplementation up to 2,500 mg L 1 with an organic loading rate of 80 g L 1 and iron supplementation up to 300 mg L 1 with an organic loading rate of 60 g L 1 and iron supplementation up to 400 mg L 1 with an organic loading rate of 80 g L 1 were found to be effective for both ultimate (total) biogas yield and methane yield.
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