生物炭在厌氧污泥颗粒化中的作用及对电子传递特性的改善。
Role of biochar in the granulation of anaerobic sludge and improvement of electron transfer characteristics.
机构信息
Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China.
Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China; Zhejiang Provincial Engineering Laboratory of Water Pollution Control, 388 Yuhangtang Road, Hangzhou 310058, China.
出版信息
Bioresour Technol. 2018 Nov;268:28-35. doi: 10.1016/j.biortech.2018.07.116. Epub 2018 Jul 25.
For improving the formation of anaerobic sludge granulation and its electron transfer characteristics, two up-flow anaerobic sludge blanket (UASB) reactors (R1 with 4 g/L biochar; R2 without biochar) were built in this study. With the addition of biochar, the lag time of methanogenesis was shortened by 28.6%, and the strengthening factor of COD removal rate reached 1.6. At the same time, the conductivity of granular sludge in R1 (23.29 ± 0.99 μS/cm) was 2-fold of that in R2, and the integrity coefficient and hydrophobicity of granular sludge were improved significantly. According to the results of microbial community succession and electron transfer characteristics, the added biochar not only favors the anaerobic sludge granulation working as an inert core, but also facilitates the selective enrichment of potential direct interspecies electron transfer (DIET) partners such as Methanothrix and Geobacter spp. for enhancing the DIET process.
为了改善厌氧污泥颗粒化及其电子传递特性，本研究构建了两个上流式厌氧污泥床（UASB）反应器（R1 中添加 4g/L 生物炭；R2 中未添加生物炭）。添加生物炭后，甲烷生成的迟滞期缩短了 28.6%，COD 去除率的强化因子达到 1.6。同时，R1 中颗粒污泥的电导率（23.29±0.99μS/cm）是 R2 的两倍，颗粒污泥的完整性系数和疏水性也得到了显著提高。根据微生物群落演替和电子传递特性的结果，添加的生物炭不仅有利于厌氧污泥颗粒化作为惰性核心，而且有利于潜在的直接种间电子传递（DIET）伙伴如 Methanothrix 和 Geobacter spp 的选择性富集，从而增强 DIET 过程。
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