Division of Environmental Engineering, Graduate School of Engineering, Hokkaido University, North-13, West-8, Kita-ku, Sapporo 060-8628, Japan.
Division of Environmental Engineering, Graduate School of Engineering, Hokkaido University, North-13, West-8, Kita-ku, Sapporo 060-8628, Japan.
Sci Total Environ. 2022 Jul 1;828:154573. doi: 10.1016/j.scitotenv.2022.154573. Epub 2022 Mar 15.
Biological in-situ biogas upgrading is a promising approach for sustainable energy-powered technologies. This method increases the CH content in biogas via hydrogenotrophic methanogenesis with an external H supply. In this study, an anaerobic membrane bioreactor (AnMBR) was employed for in-situ biogas upgrading. The AnMBR was operated in semi-batch mode using waste activated sludge as the substrate. Pulsed H addition into the reactor and biogas recirculation effectively increased the CH content in the biogas. The addition of 4 equivalents of H relative to CO did not lead to appreciable biogas upgrading, although the acetate concentration increased significantly. When 11 equivalents of H were introduced, the biogas was successfully upgraded, and the CH content increased to 92%. The CH yield and CH production rate were 0.31 L/g-VS and 0.086 L/L/d, respectively. In this phase of the process, H addition increased the acetate concentration and the pH because of CO depletion. Compared with a continuously-stirred tank reactor, the AnMBR system attained higher CH content, even without the addition of H. The longer solid retention time (100 d) in the AnMBR led to greater degradation of volatile solids. Severe membrane fouling was not observed, and the transmembrane pressure remained stable under 10 kPa for 117 d of continuous filtration without cleaning of the membrane. The AnMBR could be a promising reactor configuration to achieve in-situ biogas upgrading during sludge digestion.
生物原位沼气升级是一种有前途的可持续能源技术方法。该方法通过外部 H 供应的氢营养型产甲烷作用增加沼气中的 CH 含量。在这项研究中，采用厌氧膜生物反应器（AnMBR）进行原位沼气升级。AnMBR 采用间歇式操作模式，以废活性污泥作为底物。脉冲式 H 加入到反应器中并进行沼气再循环，有效地增加了沼气中的 CH 含量。尽管乙酸盐浓度显著增加，但加入 4 当量的 H 相对于 CO 并没有导致沼气明显升级。当引入 11 当量的 H 时，沼气成功升级，CH 含量增加到 92%。CH 产率和 CH 生产速率分别为 0.31 L/g-VS 和 0.086 L/L/d。在此过程的这一阶段，由于 CO 耗尽，H 加入会增加乙酸盐浓度和 pH 值。与连续搅拌槽式反应器相比，即使不添加 H，AnMBR 系统也能达到更高的 CH 含量。AnMBR 中的固体停留时间（100 d）更长，导致挥发性固体的降解更大。在 117 天的连续过滤过程中，未进行膜清洗，膜跨膜压力在 10 kPa 以下保持稳定，没有出现严重的膜污染。AnMBR 可能是一种很有前途的反应器构型，可在污泥消化过程中实现原位沼气升级。
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