Hydrodynamic cavitation as a novel approach for pretreatment of oily wastewater for anaerobic co-digestion with waste activated sludge |
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| Affiliation: | 1. Faculty of Environment, University of Tehran, No. 25, Ghods St., Enghelab Ave., Tehran, Iran;2. Faculty of Civil and Environmental Engineering, Ostfalia University of Applied Sciences, Herbert-Meyer-Str. 7, 29556 Suderburg, Germany;3. Department of Water and Wastewater Engineering, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, East Vafadar Blvd, Tehranpars, Tehran, Iran;1. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-338, Republic of Korea;2. Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology, Daejeon, 305-600, Republic of Korea;1. Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran;2. Department of Mechanics of Agricultural Machinery Engineering, University of Tarbiat Modares, Tehran, Iran;1. Center for Water Resources Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seonbuk-gu, Seoul 136-791, Republic of Korea;2. Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea;1. D. Y. Patil College of Engg and Tech., Kasaba Bawada, Kolhapur 416006, India;2. KLE Dr. M. S. Sheshgiri College of Engg. and Tech, Belgaum 590008, India;1. E-PIC S.r.l. Turin, Via Ippolito Nievo 25, Turin 10143, Italy;2. Dipartimento di Scienza e Tecnologia del Farmaco and NIS – Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, 10125 Turin, Italy |
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| Abstract: | Application of hydrodynamic cavitation (HC) was investigated with the objective of biogas production enhancement from co-digestion of oily wastewater (OWW) and waste activated sludge (WAS). Initially, the effect of HC on the OWW was evaluated in terms of energy consumption and turbidity increase. Then, several mixtures of OWW (with and without HC pretreatment) and WAS with the same concentration of total volatile solid were prepared as a substrate for co-digestion. Following, several batch co-digestion trials were conducted. To compare the biogas production, a number of digestion trials were also conducted with a mono substrate (OWW or WAS alone). The best operating condition of HC was achieved in the shortest retention time (7.5 min) with the application of 3 mm diameter orifice and maximum pump rotational speed. Biogas production from all co-digestion reactors was higher than the WAS mono substrate reactors. Moreover, biogas production had a direct relationship with OWW ratio and no major inhibition was observed in any of the reactors. The biogas production was also enhanced by HC pretreatment and almost all of the reactors with HC pretreatment had higher reaction rates than the reactors without pretreatment. |
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| Keywords: | Hydrodynamic cavitation Anaerobic Co-digestion Oily wastewater Biogas Batch reactors |
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