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http://dx.doi.org/10.4491/KSEE.2016.38.11.618

Ferric Chloride Addition Enhances Performance of Bioelectrochemical Anaerobic Digestion of Sewage Sludge at Ambient Temperature  

Feng, Qing (Department of Environmental Engineering, Korea Maritime and Ocean University)
Song, Young-Chae (Department of Environmental Engineering, Korea Maritime and Ocean University)
Jang, Seong-Ho (Department of Bioenvironmental Energy, Pusan National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.38, no.11, 2016 , pp. 618-626 More about this Journal
Abstract
The influence of ferric ion ($Fe^{+3}$) on bioelectrochemical anaerobic digestion for sewage sludge was explored at ambient temperature ($25^{\circ}C$). Before the addition of ferric ion, the removal of volatile solids (VS) was 65.9% and the specific methane production rate was 370 mL/L/d. After the addition of ferric ion (200 ppm) to feed sludge, the bioelectrochemical anaerobic digester was more stable in the state variables including pH, alkalinity, COD and VFAs, and the VS removal and specific methane production rate were increased to 69.8% and 396 mL/L/d, respectively. However, the methane content in biogas was slightly reduced by the addition of ferric ion, indicating that the activity of planktonic anaerobic bacteria (PAB) was more improved after the addition of ferric ion. The dominances of syntrophic bacteria (Cloacamonas) and hyrolytic bacteria (Saprospiraceae, Ottowia pentelensis) in the PAB were increased by the addition of ferric ion. The addition of ferric ion improved the performance of bioelectrochemical anaerobic digestion for sewage sludge at ambient temperature.
Keywords
Bioelectrochemical; Anaerobic Digestion; Ferric Ion; Sewage Sludge; Ambient Temperature;
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Times Cited By KSCI : 2  (Citation Analysis)
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