POTENTIAL OF BIOGAS PRODUCTION FROM ACTIVATED SLUDGE AND ENERGY RECOVERY FOR WASTEWATER TREATMENT PLANTS | ||
| Misr Journal of Agricultural Engineering | ||
| Article 18, Volume 32, Issue 3, July 2015, Pages 1259-1276 PDF (756.47 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/mjae.2015.98620 | ||
| Author | ||
| M. A. Abdel-Hadi | ||
| Assoc. Prof., Dept. of Ag. Eng., Fac. of Ag., Suez Canal Univ., 41522 Ismailia, Egypt. | ||
| Abstract | ||
| The application of anaerobic digestion process with energy recovery is a promising option for sewage sludge stabilization in Egypt, which estimated around 2 million tons/year of dry sewage sludge from wastewater treatment plants (WWTPs). The paper presents an example of energy recovery of reuse sewage sludge according to operating data from the Serabium wastewater treatment plant, Ismailia, Egypt. Therefore, the objective of the present study was to investigate the possibility of biogas and methane production by mono-digestion sewage sludge, cattle dung and co-digestion mixture of them 1:1% volume in three vertical digesters batch bench-scale under mesophilic bacteria region 36 oC and 92 days hydraulic retention time (HRT). The results showed that, the substrate specific biogas production values were 0.177, 0.153 and 0.183 m3 kg-1 TS, while the average degradation percentages were 21.8, 28.4 and 26.2% proportional with the average methane percentages of 57.3, 63.5 and 62.6% for sewage sludge, cattle dung and mixture, respectively. The Chemical oxygen demand values (COD) were decreased from 46.0, 61.3 and 56.3 g L-1 at the beginning of experiment to 34.7, 41.2 and 39.0 g L-1 at the end of experiment for sewage sludge, cattle dung and mixture, respectively. The biogas energy and electrical energy which can be produced from sewage sludge from one cubic meter treated wastewater were 0.226 kWh and 0.079 kWhel, respectively. Production of electrical energy from biogas conducted in Serabium wastewater treatment plant leads to coverage approximately 23.4% of the total demand energy, which the average energy consumption was 0.337 kWh/m3 wastewater. | ||
| Keywords | ||
| Biogas; Sewage sludge; Wastewater treatment plants; Energy recovery; Electrical energy | ||
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