International Journal of Environmental Science and Development

Abstract—Thermal and micro-aeration pretreatments were applied to swine wastewater in order to improve hydrolysis of the substrate for biogas production. The experiments were carried out in 5-L reactors using 1% total solids concentration swine manure wastewater. Thermal pretreatments were performed at temperature of 30 oC (room temperature), 45 ^oC and 55 ^oC, while the micro-aeration pretreatments were operated at controlled ORP of -300 and -420 mV. Results indicated that hydrolysis in terms of sCOD release was increased by 18.5% and 23.1% at 45 and 55 ^oC, respectively (compared to 30 oC). TVFA also increased as a result of heightened acidogenesis. Micro-aeration could improve hydrolysis by 10.1% and 21.3%, and TVFA by 7.23% and 12.87% (compared to non micro-aeration/uncontrolled ORP) at ORP -300 and -420 mV, respectively. Both pretreatment methods attained high hydrolysis efficiency within 24 hr. However, too long of micro-aeration could lead to a loss of organic carbon thru oxidation as evidenced by the disappearing organic acids in the test reactors. Both thermal and micro-aeration pretreatments are environmental friendly and could be a simple solution to increase efficiency of biogas production by means of pre-hydrolysis.

Index Terms—Swine manure wastewater, hydrolysis, temperature, micro-aeration, pretreatment.

W. Chetawan and K. Saritpongteeraka are with the Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, 90112, Thailand (e-mail: gun.rawo@gmail.com, kanya.sarit@gmail.com).
S. Chaiprapat is with the Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, Thailand, and PSU Energy Systems Research Institute (PERIN), Prince of Songkla University, Songkhla, 90112, Thailand (e-mail: sumate.ch@psu.ac.th).

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Cite: Worakan Chetawan, Kanyarat Saritpongteeraka, and Sumate Chaiprapat, "Influence of Temperature and Oxidation-Reduction Potential on Hydrolysis of Swine Manure Wastewater," International Journal of Environmental Science and Development vol. 11, no. 3, pp. 143-147, 2020.

Copyright © 2020 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).