Volatile fatty acids production from food waste: effects of pH, temperature, and organic loading rate.

The effects of pH, temperature, and organic loading rate (OLR) on the acidogenesis of food waste have been determined. The present study investigated their effects on soluble chemical oxygen demand (SCOD), volatile fatty acids (VFAs), volatile solids (VS), and ammonia nitrogen (NH4(+)-N). Both the concentration and yield of VFAs were highest at pH 6.0, acetate and butyrate accounted for 77% of total VFAs. VFAs concentration and the VFA/SCOD ratio were highest, and VS levels were lowest, at 45 °C, but the differences compared to the values at 35 °C were slight. The concentrations of VFAs, SCOD, and NH4(+)-N increased as OLR increased, whereas the yield of VFAs decreased from 0.504 at 5 g/Ld to 0.306 at 16 g/Ld. Acetate and butyrate accounted for 60% of total VFAs. The percentage of acetate and valerate increased as OLR increased, whereas a high OLR produced a lower percentage of propionate and butyrate.

[1]  R E Speece,et al.  Hydrolysis and acidogenesis of particulate organic material in mesophilic and thermophilic anaerobic digestion , 2003, Environmental technology.

[2]  Soon Keat Tan,et al.  Municipal solid waste management in China: status, problems and challenges. , 2010, Journal of environmental management.

[3]  Wilson Parawira,et al.  Profile of hydrolases and biogas production during two-stage mesophilic anaerobic digestion of solid potato waste. , 2005 .

[4]  Yu-You Li,et al.  Continuous H2 and CH4 production from high-solid food waste in the two-stage thermophilic fermentation process with the recirculation of digester sludge. , 2010, Bioresource technology.

[5]  R Borja,et al.  Evaluation of the hydrolytic-acidogenic step of a two-stage mesophilic anaerobic digestion process of sunflower oil cake. , 2009, Bioresource technology.

[6]  Tarek Abichou,et al.  Methane flux and oxidation at two types of intermediate landfill covers. , 2006, Waste management.

[7]  R. Gill,et al.  Organic acid toxicity, tolerance, and production in Escherichia coli biorefining applications , 2005, Microbial cell factories.

[8]  Hyomi Kim,et al.  Effect of Enzymatic Pretreatment on Acid Fermentation of Food Waste , 2006 .

[9]  G. Zeeman,et al.  Anaerobic stabilisation and conversion of biopolymers in primary sludge--effect of temperature and sludge retention time. , 2004, Water research.

[10]  P. Llabrés,et al.  The use of organic fraction of municipal solid waste hydrolysis products for biological nutrient removal in wastewater treatment plants , 1999 .

[11]  Hang-Sik Shin,et al.  Effect of initial pH independent of operational pH on hydrogen fermentation of food waste. , 2011, Bioresource technology.

[12]  Qiang Guo,et al.  Bio-hydrogen production from food waste and sewage sludge in the presence of aged refuse excavated from refuse landfill , 2008 .

[13]  Ammaiyappan Selvam,et al.  Effect of inoculum to substrate ratio on the hydrolysis and acidification of food waste in leach bed reactor. , 2012, Bioresource technology.

[14]  T. Toda,et al.  Effect of temperature on VFA's and biogas production in anaerobic solubilization of food waste. , 2009, Waste management.

[15]  H. Shu,et al.  Treatment of MSW landfill leachate by a thin gap annular UV/H2O2 photoreactor with multi-UV lamps. , 2006, Journal of hazardous materials.

[16]  Zhang Wei-hong,et al.  Influence of alkalinity on the stabilization of municipal solid waste in anaerobic simulated bioreactor. , 2009, Journal of hazardous materials.

[17]  Jonathan W C Wong,et al.  Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: effect of pH and bulking agent. , 2011, Bioresource technology.

[18]  Paolo Pavan,et al.  Acidogenic fermentation of organic urban wastes in a plug-flow reactor under thermophilic conditions , 1995 .

[19]  P Pearce,et al.  Mechanical sludge disintegration for the production of carbon source for biological nutrient removal. , 2007, Water research.

[20]  Elsayed Elbeshbishy,et al.  Comparative study of the effect of ultrasonication on the anaerobic biodegradability of food waste in single and two-stage systems. , 2011, Bioresource technology.

[21]  D. Wareham,et al.  Utilization patterns of volatile fatty acids in the denitrification reaction , 2007 .

[22]  D. Stuckey,et al.  Nitrogen removal in a modified anaerobic baffled reactor (ABR): 1, denitrification , 2000 .

[23]  D. Wareham,et al.  Use of volatile fatty acids from an acid-phase digester for denitrification. , 2004, Journal of biotechnology.

[24]  Ho Nam Chang,et al.  Anaerobic organic acid production of food waste in once-a-day feeding and drawing-off bioreactor. , 2008, Bioresource technology.

[25]  Chen Hong,et al.  Optimization of volatile fatty acid production with co-substrate of food wastes and dewatered excess sludge using response surface methodology. , 2010, Bioresource technology.

[26]  A. E. Greenberg,et al.  Standard Methods for the Examination of Water and Wastewater seventh edition , 2013 .

[27]  G. Demirer,et al.  Performance of leaching bed reactor converting the organic fraction of municipal solid waste to organic acids and alcohols. , 2009, Chemosphere.