naa a22 4500 510751849 CHVBK 20180411083107.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11270-013-1559-4 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1559-4 Effect of Ultrasonic, Microwave and Combined Microwave-Ultrasonic Pretreatment of Municipal Sludge on Anaerobic Digester Performance [Elektronische Daten] [Anteneh Yeneneh, Siewhui Chong, Tushar Sen, Ha Ang, Ahmet Kayaalp] 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 presence of extracellular biopolymers. This study aims at investigating the effect of ultrasonic, microwave and combined microwave-ultrasonic treatment on biogas production, solids removal and dewaterability of anaerobically digested sludge. A comparison was made between the three pretreatment techniques conducting the digestion tests under similar conditions on the same synthetic sludge sample inoculated by digested sewage sludge. The experimental results depict that the combined microwave-ultrasonic treatment (2,450-MHz, 800-W and 3-min microwave treatment followed by 0.4-W/ml and 10-min ultrasonication) resulted in better digester performance than ultrasonic or microwave treatment. Mesophilic digestion of combined microwave-ultrasonic-pretreated sludge produced a significantly higher amount of methane (147ml) after a sludge retention time of 17days, whereas the ultrasonic- and microwave-treated sludge samples produced 30 and 16ml of methane, respectively. The combined microwave-ultrasonic treatment resulted in total solids reduction of 56.8% and volatile solid removal of 66.8%. Furthermore, this combined treatment improved dewaterability of the digested sludge by reducing the capillary suction time (CST) down to 92s, as compared to CST of 331s for microwave-treated and 285s for ultrasonically treated digested sludge samples. Optimisation tests were also carried out to determine the best combination. Springer Science+Business Media Dordrecht, 2013 Anaerobic digestion nationallicence Capillary suction time nationallicence Dewaterability nationallicence Microwave nationallicence Synthetic sludge nationallicence Ultrasonic nationallicence Yeneneh Anteneh Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut Chong Siewhui Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut Sen Tushar Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut Ang Ha Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut Kayaalp Ahmet Water Corporation of Western Australia, 6007, West Leederville, Australia aut Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-9 0049-6979 224:5<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1559-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1559-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yeneneh Anteneh Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut NATIONALLICENCE 700 1- Chong Siewhui Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut NATIONALLICENCE 700 1- Sen Tushar Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut NATIONALLICENCE 700 1- Ang Ha Department of Chemical Engineering, Curtin University, GPO Box U1987, 6845, Perth, Australia aut NATIONALLICENCE 700 1- Kayaalp Ahmet Water Corporation of Western Australia, 6007, West Leederville, Australia aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/5(2013-05-01), 1-9 0049-6979 224:5<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer