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This paper present a study of the effect of applying ultrasound pre-treatment in the production of methane when co-digesting mixtures of cattle manure with food waste and sludge. A series of experiments were carried out under mesophilic and thermophilic conditions in continuously stirred-tank reactors containing 70% cattle manure, 20% food waste and 10% sewage sludge. Ultrasound pre-treatment allows operating at lower HRT, achieving higher volumetric methane yields: 0.85 L CH 4 /L.day at 36ºC and 0.82 CH 4 /L.day at 55ºC, when cattle manure and sewage sludge were sonicated. With respect to the non sonicated waste, these values represent increases of up to 31% and 67% for mesophilic and thermophilic digestion, respectively.

Thermophilic co-digestion of cattle manure and food waste supplemented with crude glycerin in induced bed reactor (IBR) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. PII

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