Abstract
Biogas production can be used to recover energy from wet organic waste such as food industry residues. In this study, residues from apple juice production at the Epleblomsten juice production plant (Norway) are analyzed to determine the biogas potential.A series of batch experiments with different initial feed concentrations (0, 1, 2, 5 and I 0%) of the leachate from the apple residues are carried out to find the total biogas potential and to investigate the composition of the leachate. These experiments were also simulated by the ADM I (Anaerobic digestion model No. I) in Aquasim as a method to estimate the chemical composition of the leachate.
 According to the batch experimental data together with the simulation results it was estimated that the leachate organic matter consisted mainly of sugar and some organic acids. The estimated concentrations were used in a follow-up study to design and simulate a full scale process. The initial feed concentrations of I and 2% gave high biogas yields, while 5 and I 0% caused an overload and relatively low biogas yields. The biogas production potential was measured as the volume of biogas produced per I L feed consumed. There is no significant relationship between the residue leachate content and the gas compositions. The COD content of the feed was calculated to be about 160 g COD/L.
Highlights
The utilization and disposal of the wastes from food industry are difficult, due to their inadequate biological stability, potentially pathogenic nature, high water content, potential for rapid autoxidation, and high level of enzymatic activity [I], Methods for treating wet organic solid waste (WOSW) should obtain mass reduction, reuse and recycling
The leachate is recovered through a sieve with -I mm openings submerged in the tank. The feed in this case is stored in the feed tank for more than I year, so that most of the degradable organic material is converted into soluble organics. 5.2 Seed sludge The inoculum seed used in this experiment is mesophilic sludge from a suspended-one- stage anaerobic digestion reactor treating primary sludge at Porsgrunn wastewater treatment plant. 5.3 Experimental design The batch experiment is perfonned in series of 60 Methane yield (mL) medical syringes (Termuro) used as small anaerobic digesters
High biogas production was observed in all 15 reactors, but biogas yield, measured as ml biogas produced per ml feed is much higher in R2 and R3 compared to R4 and R5 (Table 2 and Figure 2)
Summary
The utilization and disposal of the wastes from food industry are difficult, due to their inadequate biological stability, potentially pathogenic nature, high water content, potential for rapid autoxidation, and high level of enzymatic activity [I], Methods for treating wet organic solid waste (WOSW) should obtain mass reduction, reuse and recycling. Anaerobic digestion produces biogas for energy recovery and is the only methods available to recycle energy from WOSW to fulfil the requirements for sustainable development. Anaerobic digestion includes three main steps: hydrolysis, acidogenesis and methanogenesis. The hydrolysis step is separated from the methane production. Leachate from hydrolyzed apple residues is used as the organic feed to the biogas production process studied. The experiments were simulated by the ADM I (Anaerobic digestion model No.I) in Aquasim to estimate the chemical composition of the leachate and biogas yields
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