Study on performance enhancement of anaerobic digestion of municipal sewage sludge
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This research focuses on investigating effects of combined microwave-ultrasonic pretreatment of municipal sewage sludge on anaerobic digester performance. Application of a novel combined microwave-ultrasonic pretreatment on thickened excess activated and mixed sludge significantly improved methane production, volatile solid and COD reduction, digestion kinetics, pathogen removal and dewaterability. Effects of Organic loading rate, sludge retention time and sludge mixing ratio were studied. Microwave and ultrasonic pretreatment conditions and digester operational parameters were optimized using experimental and modelling techniques.
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Yeneneh, Anteneh Mesfin; Sen, Tushar; Ang, Ha Ming; Kayaalp, A.; Kayaalp, N M. (2014)Sewage sludge is categorised under the class of non-Newtonian fluids and it manifests shear thinning behaviour. The flow patterns and rheology of sludge in wastewater treatment plants particularly before and after the ...
Effect of Ultrasonic, Microwave and Combined Microwave–Ultrasonic Pretreatment of Municipal Sludge on Anaerobic Digester PerformanceYeneneh, Anteneh; Chong, Siew; Sen, Tushar; Ang, Ha Ming; Kayaalp, A. (2013)Anaerobic digestion is one of the most effective means for the stabilisation of sludge. However, it has a very slow rate-limiting hydrolysis phase which is attributed to the low biodegradability of cell walls and the ...
Effect of combined microwave-ultrasonic pretreatment of real mixed sludge on the enhancement of anaerobic digester performanceYeneneh, Anteneh; Kayaalp, A.; Sen, Tushar; Ang, Ming (2015)The anaerobic biodegradability of combined microwave-ultrasonic pretreated thickened excess activated sludge (PTEAS) mixed with raw primary sludge (PS) was investigated in this study. The pretreatment resulted in the ...