Optimisation of single-phase dry-thermophilic anaerobic digestion under high organic loading rates of industrial municipal solid waste: population dynamics.
Different high feed organic loading rates (OLRs) (from 5.7 g to 46.0 g TVS/l/d) or hydraulic retention times (HRTs) (from 15 d to 2 d) in single-phase dry-thermophilic anaerobic digestion (AD) of organic fraction municipal solid waste (OFMSW) were investigated. The specific gas production (SGP) values (0.25-0.53 m(3)/kg TVS) and the percentages of Eubacteria, Archaea, H2-utilising methanogens (HUMs) and acetate-utilising methanogens (AUMs) were stable within the ranges 80.2-91.1%, 12.4-18.5%, 4.4-9.8% and 5.5-10.9%, respectively. A HUM/AUM ratio greater than 0.7 seems to be necessary to maintain very low partial pressures of H2 required for dry AD process. Increasing OLR resulted in an increase in all the populations, except for propionate-utilising acetogens (PUAs). Optimal conditions were obtained at 3d HRT (OLR=30.7 g TVS/l/d), which is lower than the doubling time of acetogens and methanogens. The methane production (MP) was clearly higher than those reported in AD of OFMSW.
Department of Environmental Technologies, Faculty of Marine and Environmental Sciences (CASEM), University of Cádiz, Pol. Río San Pedro s/n, 11510 Puerto Real Cádiz, Spain.
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Zahedi
Department of Environmental Technologies, Faculty of Marine and Environmental Sciences (CASEM), University of Cádiz, Pol. Río San Pedro s/n, 11510 Puerto Real Cádiz, Spain.
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Sales
Department of Chemical Engineering and Food Technology, Faculty of Sciences, University of Cádiz, Pol. Río San Pedro s/n, 11510 Puerto Real Cádiz, Spain.
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Romero
Department of Environmental Technologies, Faculty of Marine and Environmental Sciences (CASEM), University of Cádiz, Pol. Río San Pedro s/n, 11510 Puerto Real Cádiz, Spain. Electronic address: rosario.solera@uca.es.
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Solera
D000693:Anaerobiosis; D001105:Archaea / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology*; D005740:Gases; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D008697:Methane / Q000737:chemistry*; D015345:Oligonucleotide Probes / Q000737:chemistry; D011312:Pressure; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000382:microbiology; D062611:Solid Waste; D013997:Time Factors
D056804:Biofuels; D005740:Gases; D007220:Industrial Waste; D015345:Oligonucleotide Probes; D012722:Sewage; D062611:Solid Waste; D008697:Methane
Dry-thermophilic; High OLR; Methane production; Methanogenic activity; Microbial dynamic