 ISSN 0235-7224 ISSN 2029-0586 (online) |
2008 m. Nr. 1 Anaerobic recycling of organic waste and recovery of biogas
The authors analyse the quantitative and qualitative findings of research on biogas. Biogas was recovered by anaerobic biodegrading of various substrates: sewage treatment sludge, hen manure, and pig manure. The volume of each substrate was 200 l, including 20% of dry mass. Once a day, the substrate temperature, pH, the content of biogas as well as of methane, hydrogen sulphide and oxygen in biogas were measured. Throughout the experiment, biogas output from sewage sludge totalled 0.0782 m3, from hen manure 0.1066 m3 and from pig manure to 0.1150 m3 from 0.2 m3 of the substrate. The largest biogas output was obtained from digesting pig manure in anaerobic conditions. The largest net amount of biogas (gas amount with regard to the content of methane therein) was produced in the course of anaerobic biodegradation of pig manure. The average amount of biogas was 0.0028 m3 per day. The evolution of gas from sewage sludge was 58.2% and from hen manure 52.7% as compared with pig manure. Keywords: organic waste, anaerobic process, biogas |
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