Abstract
The influence of co-substrates on kinetics of methane production in anaerobic fermentation of pig slurry was studied by performing a series of laboratory experiments using food waste and biowaste as co-substrates. Experiments were performed in the laboratory reactors of «Hohenheim» biogas testing system in batch mode at the temperature of 37ºC. Given 40 g of fresh pig slurry was fed to each digester and mixed with co-substrates in the ration of 55:45% by organic dry matter content. Methane production rate was used to evaluate co-digestion of pig slurry. Research results showed that co-substrates gave significant effect to methane production kinetics. The kinetic parameters of methane production i.e. potential yield of methane (P), maximum methane yield rate (Rm) and duration of lag-phase (λ) were analyzed using modified Gompertz equation. Technical time to produce 95% of potential methane yield was investigated and efficient period of anaerobic digestion was calculated. The potential production of methane was reached in lag-phase duration (λ) of 10-13 days. Maximal methane production rate was reduced 2-3 times in co-digestion than in mono-digestion of pig slurry. The potential yield of methane (P) was 0.420 Nm3(kg оDM)-1, 0.246 Nm3(kg оDM)-1 and 0.198 Nm3(kg оDM)-1 in mono-digestion and co-digestion of pig slurry with food waste and biowaste, respectively.
Highlights
Anaerobic digestion (AD) is one of the most effective and alternative methods of organic wastes treatment from agriculture and food industry that was used for many years result in improvement of waste stabilization, pollution control, manure quality producing fertilizer and biogas production (Weiland, 2006)
Four groups of microorganisms take place in methane fermentation creating syntrophic interrelation and requiring different environmental conditions in separate phases of anaerobic digestion indicated as hydrolysis, acidogenesis, acetogenesis and methanogenesis (Deublein & Steinhauser, 2008; Weiland, 2010)
Volume of methane was identified in the amount of 0.006 Nm3(kg organic dry matter (oDM))-1day-1 to 3-4 days and the slow gradual rise of the daily production of methane was found up to the 30th day, showing a peak in the 29th day in a volume of 0.069 Nm3(kg oDM)-1 for sample 1, 0.054 Nm3(kg oDM)-1 for sample 2 and 0.044 Nm3(kg oDM)-1 for sample 3
Summary
Anaerobic digestion (AD) is one of the most effective and alternative methods of organic wastes treatment from agriculture and food industry that was used for many years result in improvement of waste stabilization, pollution control, manure quality producing fertilizer and biogas production (Weiland, 2006). Martins das Neves et al (2009) pointed biogas as a renewable energy source produced by a large number of anaerobic microorganisms consortia and AD process is characterized by a series of biochemical transformations (Fantozzi & Buratti, 2009). Four groups of microorganisms take place in methane fermentation creating syntrophic interrelation and requiring different environmental conditions in separate phases of anaerobic digestion indicated as hydrolysis, acidogenesis, acetogenesis and methanogenesis (Deublein & Steinhauser, 2008; Weiland, 2010). Methane fermentation can be limited by formation of ammonia and hydrogen sulfide in the protein decomposition (Deublein & Steinhauser, 2008)
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