Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion

Byung-Kyu Ahn, Tae-Hoon Kim, Jiyun Seon, Seung-Kyun Park and Yeo-Myeong Yun
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Byung-Kyu Ahn: Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, Korea
Tae-Hoon Kim: Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, Korea
Jiyun Seon: Seojin Energy Co., Ltd., 410, Jeongseojin-ro, Seogu, Incheon 22689, Korea
Seung-Kyun Park: Seojin Energy Co., Ltd., 410, Jeongseojin-ro, Seogu, Incheon 22689, Korea
Yeo-Myeong Yun: Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, Korea

Energies, 2021, vol. 14, issue 20, 1-8

Abstract: Direct addition of sulfur-reducing agents during anaerobic digestion (AD) is very effective in controlling hydrogen sulfide (H 2 S) content in biogas, although one major problem is the high operational cost due to the large amount of chemicals used. The objective of this study was to remove H 2 S using a waste mill scale (MS) as a sulfur-reducing agent. To evaluate its feasibility, MS was added to AD fed with food waste (FW) at concentrations between 0 and 160 g MS/kg total chemical oxygen demand (TCOD) during the batch test, and the experimental results were compared to those of the batch test with the addition of iron chloride (FeCl 3 ). Both FeCl 3 and MS played an important role as electro-conductive materials in improving methane productivity by promoting direct interspecies electron transfer. An increase in H 2 S removal efficiency was observed with increases in both materials. In total, 30%, 60%, and 90% of H 2 S production based on the maximum sulfur in the form of H 2 S (control) was 3.7, 9.4, and 23.8 g FeCl 3 /kg TCOD and 13.3, 34.1, and 86.2 g MS/kg TCOD, respectively. This finding indicates that MS can be used as a sulfur-reducing agent substitute for H 2 S removal in AD fed with FW.

Keywords: anaerobic digestion; food waste; hydrogen sulfide production; mill scale; sulfur-reducing agent (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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