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The use of biochar as an additive material in various compositions to the anaerobic digestion of the tannery wastewater was investigated. Pyrolytic biochar made from Khat waste with different compositions was added to anaerobic batch digesters in laboratory-scale experiments. Biogas digesters of 500 ml volume were used to explore the effects of biochar on anaerobic digestion in the ratios of 5, 10, 15, and 20% (w/w) at constant mesophilic temperature (38 °C). The results show that for five experimental tests in digesters (D0, D1, D2, D3, and D4), which contains 0, 5, 10, 15, and 20% of biochar, the cumulative methane and biogas yields were, respectively, 17.04, 41.2, 43.8, 51.6, 48.6% and 150, 520, 680, 760, 690ml. Compared to the cumulative methane production efficiency of the digester without biochar (D0), the addition of 5, 10, 15, and 20% biochar had more favorable effects and increased the efficiency by 58.6, 61.1, 66.98, and 64.94%, respectively. From these results, adding 15% of biochar to anaerobic digestion causes a three-fold increase in methane compared to the control and more positive effects than all other biochar compositions. According to this result, the right dose of biochar must be added to maximize biogas production.

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研究了使用生物炭作为各种组合物的添加剂材料对制革废水进行厌氧消化。在实验室规模的实验中，将由不同成分的阿拉伯茶废物制成的热解生物炭添加到厌氧间歇式消化器中。使用500 ml体积的沼气池来探讨恒定中温温度（38℃）下生物炭在5%、10%、15%和20%（w/w）比例下对厌氧消化的影响。结果表明，在含有 0%、5%、10%、15% 和 20% 生物炭的消化池（D0、D1、D2、D3 和 D4）中进行 5 次实验测试，累积甲烷和沼气产量分别为 17.04 、41.2、43.8、51.6、48.6% 和 150、520、680、760、690ml。与不添加生物炭的沼气池的累计甲烷生产效率（D0）相比，添加5、10、15、和20%生物炭的效果更佳，效率分别提高了58.6%、61.1%、66.98%和64.94%。从这些结果来看，在厌氧消化中添加 15% 的生物炭会导致甲烷含量比对照增加三倍，并且比所有其他生物炭组合物产生更积极的效果。根据这一结果，必须添加正确剂量的生物炭才能最大限度地提高沼气产量。