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Environmental Engineering Research 2001;6(3): 139-146.
Zubair Ahmed1, Volodymir Ivanov2, Seung-Hoon Hyun1, Kwang-Myeung Cho3, and In S. Kim1
1Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology, Kwangju 500-712, Korea
2Division of Environmental and Water Resources Engineering, School of Civil & Structural Engineering, Nanyang Technological University, Singapore
3Division of Environmental and Geo-system Engineering, Inha University, Inchon 402-751, Korea
Corresponding Author: In S. Kim ,Tel: +82-62-970-2436, Fax: +82-62-970-2434, Email: iskim@kjist.ac.kr
Received: April 15, 2001;  Accepted: July 15, 2001.
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Iron was used to reduce the inhibition caused by long-chain fatty acids to bacteria involved in anaerobic digestion. Degradation of stearic acid, one of model compound of LCFA, was improved in the presence of divalent iron. The methane production rate was higher in the presence of iron (0.21 mL/L-hr) as compared to control (0.17 mL/L-hr) where iron was absent. Methane yield was 0.1 L/g COD in experiment and 0.08 L/g COD in control. Iron-containing clay was applied for degradation of vegetable oil. The methane production was increased 1.5 times as compared to control receiving no clay. Methane yield was 0.09 and 0.06 L/g COD in experiment and control respectively. COD removal efficiency was 98, 80 and 77% when iron dosage was in ratio of 20, 40, and 80 mg COD/mg Fe. respectively. Acetic and propionic acid were accumulated in reactors when iron was not present or when COD/Fe ratio was higher than 20, inhibiting the meihanogenic process. However, no accumulation of acetic and propionic acid observed when the ratio of COD/Fe was 20. Optimum COD I V ratio was found 20. Presence of iron (II) significantly improved the anaerobic digestion of fat. Iron (II) can be produced in the treatment system from iron (III) hydroxide and iron-containing minerals.
Keywords: anaerobic digestion | fat-containing wastewater | iron (II) | long-chain fatty acids | stearic acid
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