Enhancement of Fecal Sludge Conversion Into Biogas Using Iron Powder During Anaerobic Digestion Process
American Journal of Environmental Protection
Volume 5, Issue 6, December 2016, Pages: 179-186
Received: Dec. 3, 2016;
Accepted: Dec. 12, 2016;
Published: Jan. 9, 2017
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Ignace Chabi Agani, Laboratory of Physical Chemistry, University of Abomey-Calavi, Republic of Benin, Cotonou, Benin
Fidèle Suanon, Laboratory of Physical Chemistry, University of Abomey-Calavi, Republic of Benin, Cotonou, Benin; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
Biaou Dimon, Laboratory of Physical Chemistry, University of Abomey-Calavi, Republic of Benin, Cotonou, Benin
Edouard Binessi Ifon, Laboratory of Physical Chemistry, University of Abomey-Calavi, Republic of Benin, Cotonou, Benin
Frank Yovo, Laboratory of Physical Chemistry, University of Abomey-Calavi, Republic of Benin, Cotonou, Benin
Valentin Dieudonné Wotto, Laboratory of Physical Chemistry, University of Abomey-Calavi, Republic of Benin, Cotonou, Benin
Olusegun Kazeem Abass, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
Mathieu Nsenga Kumwimba, Key Laboratory of Mountain Surface Processes and Ecological Regulation Chinese Academy of Sciences, Chengdu, China
Anaerobic digestion is often used to stabilized and convert organic wastes into methane and biological fertilizer. However, when applied to fecal sludge, it doesn’t yield good methane due to its high content of nitrogen. Here we have conducted anaerobic digestion of fecal sludge in the presence of iron powder (Fe) as electron donor. Results showed that 4822.7 mL CH4 kg-1 was successfully recovered from fecal sludge in the control. The use of Fe in the anaerobic bio-digester remarkably improved methane yield. Indeed, up to 9933.3 mL CH4 kg-1 wet sludge was recovered when Fe is properly used (1 g Fe for 400 g wet weight), compared to 4822.7 mL kg-1 in the control. The concentration of methane in the produced biogas increased from 58.0% in the control to 72.5% and 77.6% in the presence of iron powder, respectively at the dose rate of 0.5 g Fe and 1 g Fe per 400 g wet sludge. COD removal efficiency was also greatly improved. 65.5% of COD was removed when excreta was properly spiked with Fe (1g Fe) against 42.2% in the control. This corresponds to an increasing rate of 23%. Furthermore, the presence of Fe in the digesters considerably reduced the odor by trapping produced sulphur ion and prevent the formation of H2S responsible for the sickening odor.
Ignace Chabi Agani,
Edouard Binessi Ifon,
Valentin Dieudonné Wotto,
Olusegun Kazeem Abass,
Mathieu Nsenga Kumwimba,
Enhancement of Fecal Sludge Conversion Into Biogas Using Iron Powder During Anaerobic Digestion Process, American Journal of Environmental Protection.
Vol. 5, No. 6,
2016, pp. 179-186.
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