Anaerobic Digestability and Biogas Production Capacity of Pistachio Processing Wastewater in UASB Reactors
Publication: Journal of Environmental Engineering
Volume 145, Issue 8
Abstract
High volumes of wastewater with considerable levels of organic and phenolic compounds and solid material are produced during pistachio processing. There is not a commonly adopted treatment technology for the wastes produced during pistachio processing. The objective of this study is to evaluate the anaerobic digestability and biogas production capacity of pistachio processing wastewater in upflow anaerobic sludge blanket (UASB) reactors for the first time in the literature. The results indicated that pistachio processing wastewater can be treated anaerobically with efficiencies comparable with other high-strength agricural wastewaters. The maximum chemical oxygen demand (COD) removal efficiency and methane yield values obtained were and , respectively, at an organic loading rate (OLR) of . If the annual pistachio processing wastewater produced in Turkey per year () is digested anaerobically in a UASB reactor, 13,000 t of COD could be eliminated and 3.9 million cubic meters of methane (28,200 mWh of energy) can be produced.
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Acknowledgments
The authors would like to acknowledge TEKNOCEV Engineering and Consulting Ltd. for providing pistachio processing waste samples.
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Published In
Journal of Environmental Engineering
Volume 145 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jun 19, 2018
Accepted: Jan 10, 2019
Published online: May 31, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 31, 2019
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