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Impact of coconut husk biochar on methane production rate in batch type anaerobic digester fed with cattle dung and cooked kitchen waste
Biomass & Bioenergy ( IF 5.8 ) Pub Date : 2024-07-04 , DOI: 10.1016/j.biombioe.2024.107300
Shayaram Basumatary , Pranab Goswami , Pankaj Kalita

The current investigation is a comparative study of anaerobic co-digestion (AcoD) of cattle dung (CD) and cooked kitchen waste (CKW) without and with biochar addition under ambient and mesophilic (35 ± 2 °C) temperatures. The novelty of the investigation is that it focuses on the effect of substrate mixing ratio (SMR), biochar addition, and temperature on AcoD. Initially, four sets of biochemical methane potential (BMP) tests were performed simultaneously, considering the same SMR of 100:0,0:100, 70:30, 60:40, 50:50, 40:60, and 30:70 on mass basis without and with biochar (15 g/L) addition. Considerably, a higher rate of methane (CH) yield was achieved for the biochar-added and mesophilic digesters. The maximum specific methane yield (SMY) was detected for the SMR 40:60 for all sets of BMP tests, wherein the SMY for the biochar-added digesters under ambient and mesophilic temperatures were 213.29 and 249.98 mLCH/gVS, respectively. Consequently, considering the SMR 40:60, another set of BMP test was performed under ambient temperature by adding varying quantities of biochar: 5, 10, 15, 20 and 25 g/L, to identify the most feasible needed amount of biochar to be added for maximum CH generation. The digester containing 15 g/L biochar exhibited 14.23 %, 9.89 %, 3.00 %, and 7.91 % higher cumulative CH yield than the digesters containing 5, 10, 20 and 25 g/L biochar, respectively, confirming that 15 g/L biochar addition in the slurry of SMR 40:60, can be recognised as the most effective SMR for AcoD of CD and CKW. This study reveals that biochar addition improves the AcoD process.

中文翻译:


椰壳生物炭对牛粪和餐厨垃圾间歇式厌氧消化池甲烷产率的影响



目前的研究是在环境温度和中温 (35 ± 2 °C) 温度下,对未添加和添加生物炭的牛粪 (CD) 和熟厨余垃圾 (CKW) 进行厌氧共消化 (AcoD) 的比较研究。该研究的新颖之处在于它重点关注底物混合比 (SMR)、生物炭添加量和温度对 AcoD 的影响。最初,同时进行四组生化甲烷潜力(BMP)测试,考虑到相同的 SMR 100:0、0:100、70:30、60:40、50:50、40:60 和 30:70不添加和添加生物炭 (15 g/L) 的质量基础。值得注意的是,添加生物炭的中温消化池获得了更高的甲烷 (CH) 产率。所有 BMP 测试组均检测到 SMR 40:60 的最大比甲烷产量 (SMY),其中添加生物炭的消化池在环境温度和中温温度下的 SMY 分别为 213.29 和 249.98 mLCH/gVS。因此,考虑到 SMR 40:60,在环境温度下进行了另一组 BMP 测试,添加了不同数量的生物炭:5、10、15、20 和 25 g/L,以确定最可行的生物炭所需量。添加的目的是为了最大程度地产生 CH。含有 15 g/L 生物炭的消化池的累积 CH 产量分别比含有 5、10、20 和 25 g/L 生物炭的消化池高 14.23%、9.89%、3.00% 和 7.91%,证实了 15 g/L 生物炭在SMR 40:60的浆料中添加,可以被认为是对CD和CKW的AcoD最有效的SMR。这项研究表明,生物炭的添加改善了 AcoD 过程。
更新日期:2024-07-04
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