Electrochemical decolorization of liquid digestate from coffee waste biomass using a boron-doped diamond anode
抄録
Liquid digestate can be used to provide nutrients for microalgae cultivation but the medium needs to be clear and colorless. The aim of this work was to use liquid digestate from coffee waste biomass to produce a light-permeable medium for microalgae cultivation. A boron-doped diamond anode was applied for electrochemical decolorization of the digestate. The electrochemical oxidation process reduced the platinum-cobalt color value by up to 97% and the chemical oxygen demand by 84.1%. After electrochemical oxidation, 87.4% of the ammonium nitrogen (NH₄-N) was retained. Decolorization of the spent coffee grounds liquid digestate was compared with that of dairy cow manure liquid digestate. It took 90 min longer to fully decolorize the spent coffee grounds liquid digestate compared with the dairy cow manure liquid digestate. The boron-doped diamond anode performed better in the decolorization than Ti/IrO₂ and Ti/Pt anodes. The effects of the initial Fe²⁺ concentration and current on the electrochemical oxidation process were also evaluated. Increasing the initial Fe²⁺ concentration enhanced the Fenton reaction and chemical oxygen demand removal. A higher current enhanced the electrochemical decolorization process and side reactions. Electrochemical oxidation using a boron-doped diamond anode is a promising method for producing an appropriate medium for microalgae cultivation because it promotes decolorization of liquid digestate and retains most of the NH₄-N.
収録刊行物
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- International Journal of Environmental Science and Technology
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International Journal of Environmental Science and Technology 21 (10), 6999-7008, 2024-06
Springer Nature
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詳細情報 詳細情報について
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- CRID
- 1050018672316304896
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- ISSN
- 17352630
- 17351472
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- HANDLE
- 20.500.14094/0100489427
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB