Co - Digestion of Municipal Biowaste and Sewage Sludge for Biogas Production
نویسندگان
چکیده
Abstact: The aim of the research project was to carry out the co-digestion of organic fraction of solid municipal waste in the form of source separated kitchen waste and sewage sludge. The influence of the kitchen waste as a co-substrate on the stability and efficiency of the process was determined. Mesophilic fermentation (36 ̊C) was conducted for sewage sludge as well as mixtures of sewage sludge and biowaste based on TS proportions. Moreover, the susceptibility of the digested samples to dewatering was assessed. The kitchen waste turned out to be highly desirable as cosubstrate for methane fermentation. It exhibited a positive influence on the total biogas production, process stability, organic matter reduction (VS) as well as biogas yield. The sample with a TS proportion of 60% from kitchen biowaste turned out to be optimal. The capillary suction time (CST) measurement showed that co-digestion did not change significantly dewatering properties of the fermentation digestate.
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