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Abstract
Anaerobic co-digestion improves the pig faeces digestion process. This work presents anaerobic digestion of pig faeces (C) as compared to 2 co-substrates: Sludge (L) from waste waters and bovine ruminal gastric content (R). Pig faeces used were generated in a local farm at the Juarez Autonomous University of Tabasco (UJAT), with a total population of 148 animals. Analytical determinations were made on the substrate and co-substrates. Each treatment was performed in triplicate (9 experimental units), for 18 weeks. C+R co-digestion had the highest removal of chemical oxygen demand (COD) with 90%. Biogas production (0.012 L day-1) was quantified for C and C+R, with concentrations of 70.87±8.65 and 71.89 ± 7.60% of methane (CH4), respectively. For C+L, it was 0.009 L day-1, with 77.89±6.74% of CH4. Results obtained showed that co-digestion of C+L was better with regards to the quality of biogas from low hydrogen sulfide (H2S) concentrations (70.33±6.36 ppm). The use of anaerobic co-digestion systems represents an alternative treatment for faeces generated in pig farms and other kinds of wastes to reduce the potential source of infection produced by these types of waste. Key words: Biogas, digester, manure, pig faeces, rumen.
Highlights
Breeding of pig is an important and constantly growing activity in rural areas, which represents an option of food and economical resource
Kaparaju and Rintala (2005), who suggested that the codigestion process should have a pH between 7.1 and 8.1
Oxide-reduction potential (ORP) values showed an average of 300 mV, highlighting the redox condition (Figure 4)
Summary
Breeding of pig is an important and constantly growing activity in rural areas, which represents an option of food and economical resource. Pig activity is carried out in farms with the purpose of reproduction and sale of livestock. These activities generate water from washouts, food wastes, faeces and urine, with a high organic load, mostly disposed in natural aquatic environments in open landfill, without any treatment. Productions of pig worldwide generate 9% of the greenhouse gas (GHG) emissions in the livestock sector. In Mexico, 66,708.27 tons of faeces are produced per year with contribution of 27.80% (18.547 tons per year) from the pig sector (Gerber et al, 2013). In Tabasco, in year 2015, 265,214 heads in 45,828
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