Dry-thermophilic anaerobic digestion of organic fraction of the municipal solid waste: focusing on the inoculum sources.

The effect of inoculum source on anaerobic thermophilic digestion of separately collected organic fraction of municipal solid wastes (SC_OFMSW) has been studied. Performance of laboratory scale reactors (V: 1.1 L) were evaluated using six different inoculums sources: (1) corn silage (CS); (2) restaurant waste digested mixed with rice hulls (RH_OFMSW); (3) cattle excrement (CATTLE); (4) swine excrement (SWINE); (5) digested sludge (SLUDGE); and (6) SWINE mixed with SLUDGE (1:1) (SWINE/SLUDGE). The SC_OFMSW was separately and collected from university restaurant. The selected conditions were: 25% of inoculum, 30% of total solid and 55 degrees C of temperature, optimum in the thermophilic range. The six inoculum sources showed an initial start-up phase in the range between 2 and 4 days and the initial methane generation began over 10 days operational process. Results indicated that SLUDGE is the best inoculum source for anaerobic thermophilic digestion of the treatment of organic fraction of municipal solid waste at dry conditions (30%TS). Over 60 days operating period, it was confirmed that SLUDGE reactor can achieve 44.0%COD removal efficiency and 43.0%VS removal. In stabilization phase, SLUDGE reactor showed higher volumetric biogas generated of 78.9 mL/day (or 35.6 mLCH(4)/day) reaching a methane yield of 0.53 LCH(4)/gVS. Also, SWINE/SLUDGE and SWINE were good inoculums at these experimental conditions.

[1]  Daeho Ko,et al.  Optimization of start-up operating condition in RPSA , 2000 .

[2]  Antonio M. Martin,et al.  Effect of substrate concentration and temperature on the anaerobic digestion of piggery waste in a tropical climate , 2001 .

[3]  M. S. Rao,et al.  Bioenergy conversion studies of organic fraction of MSW: kinetic studies and gas yield--organic loading relationships for process optimisation. , 2004, Bioresource technology.

[4]  B. Ahring,et al.  Strategies for the anaerobic digestion of the organic fraction of municipal solid waste: an overview. , 2006, Water science and technology : a journal of the International Association on Water Pollution Research.

[5]  Paolo Pavan,et al.  Anaerobic digestion of the Barcelona central food market organic wastes. Experimental study. , 1992 .

[6]  Moktar Hamdi,et al.  Effect of temperature on the performance of an anaerobic tubular reactor treating fruit and vegetable waste , 2004 .

[7]  L De Baere,et al.  Will anaerobic digestion of solid waste survive in the future , 2006 .

[8]  C. Gallert,et al.  Scale-up of anaerobic digestion of the biowaste fraction from domestic wastes. , 2003, Water research.

[9]  J. Mata-Álvarez,et al.  Nitrification, denitrification and biological phosphorus removal in piggery wastewater using a sequencing batch reactor. , 2003, Bioresource technology.

[10]  D Bolzonella,et al.  Semi-dry thermophilic anaerobic digestion of the organic fraction of municipal solid waste: focusing on the start-up phase. , 2003, Bioresource technology.

[11]  T. Carballas,et al.  Técnicas de análisis de suelos. , 1964 .

[12]  Diego Sales,et al.  Anaerobic mesophilic and thermophilic municipal sludge digestion , 2002 .

[13]  D. H. Kim,et al.  Effect of particle size and sodium ion concentration on anaerobic thermophilic food waste digestion. , 2000, Water science and technology : a journal of the International Association on Water Pollution Research.

[14]  S. Ledakowicz,et al.  Degradation of household biowaste in reactors. , 2001, Journal of biotechnology.

[15]  S Mace,et al.  Dry anaerobic digestion of differently sorted organic municipal solid waste: a full-scale experience. , 2006, Water science and technology : a journal of the International Association on Water Pollution Research.

[16]  Joan Mata-Álvarez,et al.  Anaerobic digestion of organic solid wastes. An overview of research achievements and perspectives , 2000 .

[17]  L De Baere,et al.  Will anaerobic digestion of solid waste survive in the future? , 2006, Water science and technology : a journal of the International Association on Water Pollution Research.

[18]  W. Lopes,et al.  Influence of inoculum on performance of anaerobic reactors for treating municipal solid waste. , 2004, Bioresource technology.

[19]  F. W. Gilcreas,et al.  Standard methods for the examination of water and waste water. , 1966, American journal of public health and the nation's health.

[20]  L. Bere,et al.  Anaerobic digestion of solid waste: state-of-the-art , 2000 .

[21]  G. Bot,et al.  Effect of temperature and temperature fluctuation on thermophilic anaerobic digestion of cattle manure. , 2004, Bioresource technology.

[22]  Moktar Hamdi,et al.  Bioreactor performance in anaerobic digestion of fruit and vegetable wastes , 2005 .

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

[24]  J. M. Owens,et al.  Renewable methane from anaerobic digestion of biomass , 1997 .

[25]  L. I. Romero,et al.  Optimization of sehac start up phase of municipal solid waste anaerobic digestion , 2004 .