In-situ biogas upgrading during anaerobic digestion of food waste amended with walnut shell biochar at bench scale [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 662.8 Other fuels
• Thông tin xuất bản: Argonne, Ill. : Oak Ridge, Tenn. : Argonne National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017
• Mô tả vật lý: Size: p. 669-679 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 263245
• Chủ đề: 1. 09 biomass fuels; 2. 12 management of radioactive and non-radioactive wastes from nuclear facilities; 3. Anaerobic digestion; 4. Co2 removal; 5. Renewable methane

Tóm tắt

 Here, a modified version of an in-situ CO<
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  removal process was applied during AD of food waste with two types of walnut shell biochar (WSB) at bench-scale under batch operating mode. Compared to the coarse WSB, the fine WSB has a higher ash content (43 vs. 36 wt%) and higher concentrations of calcium (31 vs. 19 wt% of ash), magnesium (8.4 vs. 5.6 wt% of ash) and sodium (23.4 vs. 0.3 wt% of ash), but a lower potassium concentration (0.2 vs. 40% wt% of ash). The 0.96 - 3.83 g biochar (g VS<
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  fine WSB amended digesters produced biogas with 77.5-98.1% CH<
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  content by removing 40-96% of the CO<
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  compared to the control digesters at mesophilic and thermophilic temperature conditions. In a direct comparison at 1.83 g biochar (g VS<
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 , the fine WSB amended digesters (85.7% CH<
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  content and 61% CO<
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  removal) outperformed the coarse WSB amended digesters (78.9% CH<
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  content and 51% CO<
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  removal). Biochar addition also increased alkalinity as CaCO3 from 2,800 mg L<
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  in the control digesters to 4,800-6,800 mg L<
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  providing process stability for food waste AD.