Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion
Direct addition of sulfur-reducing agents during anaerobic digestion (AD) is very effective in controlling hydrogen sulfide (H<sub>2</sub>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 w...
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2021-10-01
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| Online Access: | https://www.mdpi.com/1996-1073/14/20/6542 |
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| author | Byung-Kyu Ahn Tae-Hoon Kim Jiyun Seon Seung-Kyun Park Yeo-Myeong Yun |
| author_facet | Byung-Kyu Ahn Tae-Hoon Kim Jiyun Seon Seung-Kyun Park Yeo-Myeong Yun |
| author_sort | Byung-Kyu Ahn |
| collection | DOAJ |
| description | Direct addition of sulfur-reducing agents during anaerobic digestion (AD) is very effective in controlling hydrogen sulfide (H<sub>2</sub>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<sub>2</sub>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<sub>3</sub>). Both FeCl<sub>3</sub> and MS played an important role as electro-conductive materials in improving methane productivity by promoting direct interspecies electron transfer. An increase in H<sub>2</sub>S removal efficiency was observed with increases in both materials. In total, 30%, 60%, and 90% of H<sub>2</sub>S production based on the maximum sulfur in the form of H<sub>2</sub>S (control) was 3.7, 9.4, and 23.8 g FeCl<sub>3</sub>/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<sub>2</sub>S removal in AD fed with FW. |
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| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T06:35:41Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-6e75c43d9fd44a369ff3f4b512809b0c2023-11-22T18:04:45ZengMDPI AGEnergies1996-10732021-10-011420654210.3390/en14206542Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic DigestionByung-Kyu Ahn0Tae-Hoon Kim1Jiyun Seon2Seung-Kyun Park3Yeo-Myeong Yun4Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, KoreaDepartment of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, KoreaSeojin Energy Co., Ltd., 410, Jeongseojin-ro, Seogu, Incheon 22689, KoreaSeojin Energy Co., Ltd., 410, Jeongseojin-ro, Seogu, Incheon 22689, KoreaDepartment of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju 28644, KoreaDirect addition of sulfur-reducing agents during anaerobic digestion (AD) is very effective in controlling hydrogen sulfide (H<sub>2</sub>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<sub>2</sub>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<sub>3</sub>). Both FeCl<sub>3</sub> and MS played an important role as electro-conductive materials in improving methane productivity by promoting direct interspecies electron transfer. An increase in H<sub>2</sub>S removal efficiency was observed with increases in both materials. In total, 30%, 60%, and 90% of H<sub>2</sub>S production based on the maximum sulfur in the form of H<sub>2</sub>S (control) was 3.7, 9.4, and 23.8 g FeCl<sub>3</sub>/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<sub>2</sub>S removal in AD fed with FW.https://www.mdpi.com/1996-1073/14/20/6542anaerobic digestionfood wastehydrogen sulfide productionmill scalesulfur-reducing agent |
| spellingShingle | Byung-Kyu Ahn Tae-Hoon Kim Jiyun Seon Seung-Kyun Park Yeo-Myeong Yun Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion Energies anaerobic digestion food waste hydrogen sulfide production mill scale sulfur-reducing agent |
| title | Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion |
| title_full | Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion |
| title_fullStr | Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion |
| title_full_unstemmed | Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion |
| title_short | Mill Scale Addition to Reduce Hydrogen Sulfide Production in Anaerobic Digestion |
| title_sort | mill scale addition to reduce hydrogen sulfide production in anaerobic digestion |
| topic | anaerobic digestion food waste hydrogen sulfide production mill scale sulfur-reducing agent |
| url | https://www.mdpi.com/1996-1073/14/20/6542 |
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