ANAEROBIC DIGESTION OF COMPOST LEACHATE UNDER MESOPHILIC AND THERMOPHILIC CONDITIONS | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 1, Volume 34, Issue 4, April 2009, Page 3985-3997 PDF (462.75 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2009.90825 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. A. Abdel-Hadi; S. A. M. Abd El-Azeem; I. H. El-Sheikh | ||||
| Faculty of Agriculture, Suez Canal University, 41522 Ismailia, Egypt | ||||
| Abstract | ||||
| The objective of the present study was to examine the feasibility of biological treating of compost leachate in anaerobic digester. The experimental work was also carried out to evaluate the biodegradable potential of compost leachate at thermophilic and mesophilic conditions. The laboratory bench-scale biogas horizontal digester was used for batch anaerobic digestion system of 312 hours hydraulic retention time (HRT). The obtained results showed that there was an influence of digestion temperature, pH value and production of volatile fatty acids (VFA) on biogas and methane production. The methane yield was 8.3 L kg-1 volatile solids (VS) and 373 L kg-1 VS under mesophilic and thermophilic conditions, respectively. Under mesophilic conditions, the amounts of biogas and methane were very small as compared with thermophilic conditions. Under mesophilic treatment, the highest amount of biogas production was reached to 16.7 L after 48 h and decreased to 1.3 L after 144 h from hydraulic retention time. The same trend was similarly observed in methane production but the highest amount of methane production (1.3 L) was achieved after 96 h (HRT). On the other hand, the biogas production continuously increased during the anaerobic digestion in thermophilic conditions. The maximum biogas and methane yield were 41.5 L and 30.4 L, respectively, after 192 h (HRT). Effluent from mesophilic digester mainly contained acetic acid and propionic acid more than n-butyric acid. In contrast, acetic and propionic acids were found in little concentration under thermophilic digestion. The levels of volatile fatty acids and pH value can be used as an indicator of methane yield and methanogenic activity. It could be concluded from this study that there was a possibility of anaerobic digestion of compost leachate to produce biogas and methane. The biogas and methane production were positively correlated with the anaerobic digestion temperature. Therefore, the temperature of anaerobic digester is very necessity for optimization of anaerobic digestion process. | ||||
| Keywords | ||||
| Compost leachate; batch anaerobic; biogas; methane content; mesophilic; thermophilic; volatile fatty acids | ||||
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