Influence of Continuous Flow Microwave Pre-Treatment on Anaerobic Digestion of Secondary Thickened Sludge for Sustainable Energy Recovery in Sewage Treatment Plant

International Conference on Advances in Renewable Energy and Technologies 2016

Hephzibah, D.^1 ; Kumaran, P.^2 ; Saifuddin, N.M.^2

Postgraduate Stud., Centre for Renewable Energy, Universiti Tenaga Nasional, Kajang, Selangor

43000, Malaysia^1

Principal Researcher, Centre for Renewable Energy, Universiti Tenaga Nasional, Kajang, Selangor

43000, Malaysia^2

关键词: Biogas production;    Biogas quantities;    Continuous flows;    Irradiation time;    Microwave power levels;    Pre-Treatment;    Soluble chemical oxygen demands;    Sustainable energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/32/1/012004/pdf
DOI  :  10.1088/1755-1315/32/1/012004

来源: IOP

【 摘 要 】

This work elucidates the effects of pre-treatment of secondary thickened sludge (STS) for enhancement of biogas production that has great potential to generate energy for the utilization of the sewage treatment plant (STP) itself. Microwave pre-treatment has been adopted for this study. Experiment works have been designed and conducted to examine the effectiveness of continuous flow microwave pre-treatment on the solubility of STS, digestibility of STS and biogas production at a power level of 80 W for 5, 10 and 15 minutes. A few characteristics of the sewage sludge were monitored daily to identify the effect of pre-treatment on the sludge. The soluble chemical oxygen demand (SCOD)/total chemical oxygen demand (TCOD) ratio increased by 0.1, 1.0 and 1.8%, while the volatile fatty acids (VFA) concentration of the pre-treated sludge improved by 4.4, 5.1, 5.9% at the irradiation time of 5, 10 and 15 minutes, respectively at a microwave power level of 80 W. Besides that, the digestate also indicates that the pre-treated sludge undergoes efficient VS removal and TCOD removal after anaerobic digestion compared to the untreated sludge. Moreover, the biogas quantity increased by an average of 19.2, 24.1 and 32.2% in 5, 10 and 15 minutes irradiation time respectively compared to the untreated sludge. The additional quantity of biogas generated has shown a great potential for sustainable energy generation that can be utilized internally by the STP.