Effect of pH, OLR, and HRT on performance of acidogenic and methanogenic reactors for treatment of biodiesel wastewater.

AbstractTwo-stage anaerobic process was studied in order to treat biodiesel wastewater. The first stage represented acidogenic reactor while the second stage was methanogenic reactor. The effect of pH, hydraulic retention time (HRT), and organic loading rate (OLR) on performance of both reactors was investigated. The optimum condition was examined using response surface methodology with the Box–Behnken Design. In the acidogenic reactor, the optimum pH, HRT, and OLR were 6.48, 16 h, and 26 g COD/(l d), respectively. High VFA production of 9.35 g/l was achieved with the low methane production. In the methanogenic reactor, the optimum pH, HRT, and OLR were 6.95, 30 h, and 6 g COD/(l d), respectively. Biogas production of 19.1 l/d was obtained with the methane content of 66%. VFA was completely consumed. In comparison, the two-stage system showed higher efficiency (COD removal, biogas production, and methane yield) than the one-stage system.

[1]  Mali Hunsom,et al.  Management of biodiesel wastewater by the combined processes of chemical recovery and electrochemical treatment , 2010 .

[2]  Maria Angeles Martin Santos,et al.  Anaerobic digestion of glycerol derived from biodiesel manufacturing. , 2009 .

[3]  Sami Sayadi,et al.  Application of acidogenic fixed-bed reactor prior to anaerobic membrane bioreactor for sustainable slaughterhouse wastewater treatment. , 2007, Journal of hazardous materials.

[4]  A. Dikshit,et al.  Optimization of the parameters for decolourization by Aspergillus niger of anaerobically digested distillery spentwash pretreated with polyaluminium chloride. , 2010, Journal of hazardous materials.

[5]  Y. Kuang.  Enhancing anaerobic degradation of lipids in wastewater by addition of co-substrate , 2002 .

[6]  J. Siles,et al.  Anaerobic co-digestion of glycerol and wastewater derived from biodiesel manufacturing. , 2010, Bioresource technology.

[7]  Xavier Font,et al.  Optimization of the hydrolytic-acidogenic anaerobic digestion stage (55 degrees C) of sewage sludge: influence of pH and solid content. , 2008, Water research.

[8]  C. Suksaroj,et al.  Enhanced efficiency of dissolved air flotation for biodiesel wastewater treatment by acidification and coagulation processes. , 2011 .

[9]  C. Banks,et al.  Anaerobic treatment of palm oil mill effluent in a two stage up-flow anaerobic sludge blanket (UASB) system , 1996 .

[10]  Qi Zhou,et al.  Enhancement of bioenergy production from organic wastes by two-stage anaerobic hydrogen and methane production process. , 2011, Bioresource technology.

[11]  M. Ongwandee,et al.  Anaerobic baffled reactor treatment of biodiesel-processing wastewater with high strength of methanol and glycerol: reactor performance and biogas production , 2011 .

[12]  M. Alam,et al.  Optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum, using response surface methodology. , 2007, Journal of environmental sciences.

[13]  M. Kálmán,et al.  Comparison of the effectivities of two-phase and single-phase anaerobic sequencing batch reactors during dairy wastewater treatment , 2008 .

[14]  Heguang Zhu,et al.  Evaluation of alternative methods of preparing hydrogen producing seeds from digested wastewater sludge , 2006 .

[15]  Vasileios Diamantis,et al.  Comparison of single- and two-stage UASB reactors used for anaerobic treatment of synthetic fruit wastewater , 2007 .

[16]  Samir Kumar Khanal,et al.  Anaerobic Biotechnology for Bioenergy Production: Principles and Applications , 2008 .

[17]  Youcai Zhao,et al.  Optimization of methane fermentation from effluent of bio-hydrogen fermentation process using response surface methodology. , 2008, Bioresource technology.

[18]  Diego Sales,et al.  The evolution of biomass in a two-phase anaerobic treatment process during start-up , 2002 .

[19]  Iván López,et al.  Modelling a full scale UASB reactor using a COD global balance approach and state observers , 2009 .

[20]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[21]  C. Visvanathan,et al.  Effect of organic loading rate on VFA production, organic matter removal and microbial activity of a two-stage thermophilic anaerobic membrane bioreactor. , 2011, Bioresource technology.

[22]  T. R. Sreekrishnan,et al.  Enhancement of biogas production from solid substrates using different techniques--a review. , 2004, Bioresource technology.

[23]  M. Gutiérrez,et al.  Physical-chemical and biomethanization treatments of wastewater from biodiesel manufacturing. , 2011, Bioresource technology.

[24]  Rafael Borja,et al.  Kinetic study of the methanogenic step of a two-stage anaerobic digestion process treating olive mill solid residue , 2010 .

[25]  Hang-Sik Shin,et al.  Enhancement of bioenergy production and effluent quality by integrating optimized acidification with submerged anaerobic membrane bioreactor. , 2010, Bioresource technology.

[26]  Karl-Heinz Robra,et al.  Two-stage anaerobic fermentation of organic waste in CSTR and UFAF-reactors. , 2002, Bioresource technology.

[27]  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.

[28]  Samir Kumar Khanal,et al.  Anaerobic Biotechnology for Bioenergy Production , 2008 .