Effect of organic loading rate and feedstock composition on foaming in manure-based biogas reactors P.G. Kougias, K. Boe and I. Angelidaki “NOTICE: this is the author’s version of a work that was accepted for publication in Bioresource Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Bioresource Technology, vol 144, pp 1-7, September 2013, doi: 10.1016/j.biortech.2013.06.028