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

Feng, Qing; Song, Young-Chae; Jang, Seong-Ho; Feng, Qing; Song, Young-Chae; Jang, Seong-Ho

doi:2016.38.11.618

The Korean text of this paper can be translated into multiple languages on the website of http://jksee.or.kr through Google Translator.

J Korean Soc Environ Eng > Volume 38(11); 2016 > Article

Original Paper

J Korean Soc Environ Eng 2016;38(11): 618-626. doi: https://doi.org/10.4491/KSEE.2016.38.11.618

제2철 이온을 이용한 상온조건에서 하수슬러지의 생물전기화학 혐기성소화 성능향상

풍경¹, 송영채¹, 장성호²

¹한국해양대학교 환경공학과
²부산대학교 바이오환경에너지학과

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

Qing Feng¹, Young-Chae Song¹, Seong-Ho Jang²

¹Department of Environmental Engineering, Korea Maritime and Ocean University
²Department of Bioenvironmental Energy, Pusan National University

Corresponding author

Young-Chae Song ,Tel: 051-410-4417, Fax: 051-410-4415, Email: soyc@kmou.ac.kr

Received: October 18, 2016; Revised: November 14, 2016; Accepted: November 28, 2016. Published online: November 30, 2016.

ABSTRACT

The influence of ferric ion (Fe⁺³) on bioelectrochemical anaerobic digestion for sewage sludge was explored at ambient temperature (25℃). 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.

Key Words: Bioelectrochemical, Anaerobic Digestion, Ferric Ion, Sewage Sludge, Ambient Temperature