4.7 Article Proceedings Paper

Ultrasound assisted biogas production from co-digestion of wastewater sludges and agricultural wastes: Comparison with microwave pre-treatment

Journal

ULTRASONICS SONOCHEMISTRY
Volume 40, Issue -, Pages 193-200

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2017.05.014

Keywords

Agro-wastes; Anaerobic co-digestion; Grape/olive pomace; Microwave; Ultrasonication; Wastewater sludge disintegration

Funding

  1. Research Fund of Bogazici University [08HY101D, 08Y102]

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This study investigates the effect of ultrasonication and microwave sludge disintegration/pre-treatment techniques on the anaerobic co-digestion efficiency of wastewater sludges with olive and grape pomaces. The effects of both co-digestion and sludge pre-treatment techniques were evaluated in terms of the organic removal efficiency and the biogas production. The co-digestion of wastewater sludge with both types of pomaces was revealed to be a much more efficient way for the biogas production compared to the single (mono) sludge digestion. The ultrasonication and microwave pre-treatments applied to the sludge samples caused to a further increase in biogas and methane yields. Based on applied specific energies, ultrasonication pre-treatment was found much more effective than microwave irradiation. The specific energy applied in microwave pre-treatment (87,000 kj/kgTS) was almost 9 times higher than that of used in ultrasonication (10,000 kj/kgTS), resulting only 10-15% increases in biogas/methane yield. Co-digestion of winery and olive industry residues with pre-treated wastewater sludges appears to be a suitable technique for waste management and energy production.

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