| Title: | Semi-continuous anaerobic co-digestion of orange peel waste and residual glycerol derived from biodiesel manufacturing |
| Author(s): | Martin MA; Fernandez R; Serrano A; Siles JA; |
| Address: | "Inorganic Chemistry and Chemical Engineering Department, University of Cordoba, Spain" |
| DOI: | 10.1016/j.wasman.2013.03.027 |
| ISSN/ISBN: | 1879-2456 (Electronic) 0956-053X (Linking) |
| Abstract: | "The manufacturing of orange juice generates high volumes of orange peel waste which should not be deposited in landfill according to current recommendations. Furthermore, glycerol is a compound co-generated in biodiesel manufacturing, but the volume generated is higher than the current demand for pure glycerol. The anaerobic co-digestion of orange peel waste with residual glycerol could reduce the inhibitory effect of some compounds and provide a correct nutrient balance. Under mesophilic temperature and semi-continuous conditions, a mixture of orange peel waste-residual glycerol of 1:1 (in COD) operated favorably for organic loads up to 2.10 g VS/L. At higher organic loads, the accumulation of volatile fatty acids (VFA) and a decrease in the pH caused process destabilization. The methane yield coefficient was quite constant, with a mean value of 330+/-51 mL(STP)/g VSadded, while the organic loading rate (OLR) reached a mean value of 1.91+/-0.37 kgVS/m3 d (17.59+/-2.78 kgmixture/m3 d) and the hydraulic retention time (HRT) varied in a range of 8.5-30.0 d" |
| Keywords: | "Anaerobiosis Biodegradation, Environmental *Biofuels Biological Oxygen Demand Analysis Bioreactors *Citrus sinensis/metabolism Fatty Acids, Volatile/metabolism Food Industry Glycerol/*metabolism Hydrogen-Ion Concentration *Industrial Waste Kinetics Methan;" |
| Notes: | "MedlineMartin, M A Fernandez, R Serrano, A Siles, J A eng Research Support, Non-U.S. Gov't 2013/05/18 Waste Manag. 2013 Jul; 33(7):1633-9. doi: 10.1016/j.wasman.2013.03.027. Epub 2013 May 13" |
