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J Adv Res

Title:		Enhancing anaerobic digestion of poultry blood using activated carbon
Author(s):		Cuetos MJ; Martinez EJ; Moreno R; Gonzalez R; Otero M; Gomez X;
Address:		"Chemical and Environmental Bioprocess Engineering Department, Natural Resources Institute (IRENA), University of Leon, Avda Portugal 41, 24071 Leon 24009, Spain. Department of Applied Chemistry and Physics, IMARENABIO, University of Leon, Campus de Vegazana, 24071 Leon, Spain"
Journal Title:		J Adv Res
Year:		2017
Volume:		20161229
Issue:		3
Page Number:		297 - 307
DOI:		10.1016/j.jare.2016.12.004
ISSN/ISBN:		2090-1232 (Print) 2090-1224 (Electronic) 2090-1224 (Linking)
Abstract:		"The potential of using anaerobic digestion for the treatment of poultry blood has been evaluated in batch assays at the laboratory scale and in a mesophilic semi-continuous reactor. The biodegradability test performed on residual poultry blood was carried out in spite of high inhibitory levels of acid intermediaries. The use of activated carbon as a way to prevent inhibitory conditions demonstrated the feasibility of attaining anaerobic digestion under extreme ammonium and acid conditions. Batch assays with higher carbon content presented higher methane production rates, although the difference in the final cumulative biogas production was not as sharp. The digestion of residual blood was also studied under semi-continuous operation using granular and powdered activated carbon. The average specific methane production was 216 +/- 12 mL CH(4)/g VS. This result was obtained in spite of a strong volatile fatty acid (VFA) accumulation, reaching values around 6 g/L, along with high ammonium concentrations (in the range of 6-8 g/L). The use of powdered activated carbon resulted in a better assimilation of C3-C5 acid forms, indicating that an enhancement in syntrophic metabolism may have taken place. Thermal analysis and scanning electron microscopy (SEM) were applied as analytical tools for measuring the presence of organic material in the final digestate and evidencing modifications on the carbon surface. The addition of activated carbon for the digestion of residual blood highly improved the digestion process. The adsorption capacity of ammonium, the protection this carrier may offer by limiting mass transfer of toxic compounds, and its capacity to act as a conductive material may explain the successful digestion of residual blood as the sole substrate"
Keywords:		Activated carbon Adsorption Anaerobic digestion Residual poultry blood Thermal analysis Volatile fatty acid;
Notes:		"PubMed-not-MEDLINECuetos, Maria Jose Martinez, E Judith Moreno, Ruben Gonzalez, Ruben Otero, Marta Gomez, Xiomar eng Egypt 2017/05/04 J Adv Res. 2017 May; 8(3):297-307. doi: 10.1016/j.jare.2016.12.004. Epub 2016 Dec 29"