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Anaerobic digestion of industrial dairy wastewater and cheese whey: Performance of internal circulation bioreactor and laboratory batch test at pH 5-6

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  • Charalambous, Panagiotis
  • Shin, Juhee
  • Shin, Seung Gu
  • Vyrides, Ioannis

Abstract

This study pointed out the performance of a full-scale internal circulation (IC) bioreactor (140 m3) inoculated with anaerobic granular sludge for the treatment of dairy wastewater for 91 days. The average COD removal was 80% and the average biogas was 69.8 m3 per influent COD/L per day. Then the anaerobic digestion of cheese whey (CW) at a pH 5–6 was examined at a laboratory level as a strategy to reduce the requirement for alkalinity. First, anaerobic granular sludge from IC bioreactor (pH 7–7.5), was exposed to pH 5–6 while utilizing acetic acid for 7 months. This laboratory adapted anaerobic granular sludge when fed with CW showed 30% higher methane generation under batch conditions compared to non-acclimatized granular sludge under the same conditions (pH 5–6). Higher percentage of hydrogenotrophic methanogens (mostly Methanolinea) and increase of Clostridium at the anaerobic granular sludge exposed to pH 5–6 compared to initial granular sludge was found. Propionic acid was the reaction limiting step for granular sludge under pH 5–6. Anaerobic digestion at moderately low pH required 68% less NaOH (50 %v/v) per m3 of CW however it can theoretically produce 53% less kWh per day compared to digestion at neutral pH.

Suggested Citation

  • Charalambous, Panagiotis & Shin, Juhee & Shin, Seung Gu & Vyrides, Ioannis, 2020. "Anaerobic digestion of industrial dairy wastewater and cheese whey: Performance of internal circulation bioreactor and laboratory batch test at pH 5-6," Renewable Energy, Elsevier, vol. 147(P1), pages 1-10.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:1-10
    DOI: 10.1016/j.renene.2019.08.091
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    References listed on IDEAS

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    1. Aspasia A. Chatzipaschali & Anastassios G. Stamatis, 2012. "Biotechnological Utilization with a Focus on Anaerobic Treatment of Cheese Whey: Current Status and Prospects," Energies, MDPI, vol. 5(9), pages 1-34, September.
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    1. Huy N. Q. Phan & Jyh Hoang Leu & Vi N. D. Nguyen, 2023. "The Combination of Anaerobic Digestion and Electro-Oxidation for Efficient COD Removal in Beverage Wastewater: Investigation of Electrolytic Cells," Sustainability, MDPI, vol. 15(6), pages 1-17, March.
    2. Claudio B-Arroyo & Antonio Lara-Musule & Ervin Alvarez-Sanchez & Gloria Trejo-Aguilar & Juan-Rodrigo Bastidas-Oyanedel & Eliseo Hernandez-Martinez, 2020. "An Unstructured Model for Anaerobic Treatment of Raw Cheese Whey for Volatile Fatty Acids Production," Energies, MDPI, vol. 13(7), pages 1-14, April.

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