利用锰氧化好氧颗粒污泥去除废水中的金属含氧阴离子。
Metal oxyanion removal from wastewater using manganese-oxidizing aerobic granular sludge.
机构信息
Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China.
Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
出版信息
Chemosphere. 2019 Dec;236:124353. doi: 10.1016/j.chemosphere.2019.124353. Epub 2019 Jul 11.
As, Sb, and Cr are redox-sensitive and toxic heavy metal(loid)s, and redox reactions are usually involved in the treatment of substrates containing these elements. In this study, manganese-oxidizing aerobic granular sludge (Mn-AGS) was obtained by continuously adding Mn(II) to the sludge in a sequencing batch reactor (SBR). Morphological observations, and analyses of extracellular polymeric substances (EPS), Mn valence-states, and microbial communities were performed on the resulting sludge. After 50 days of cultivation, biogenic Mn(III,IV) oxides (bio-MnO) accumulated up to approximately 25 mg Mn/g suspended solids (SS). X-ray photoelectron spectroscopy (XPS) revealed that the percentage of Mn(III,IV) was 87.6%. The protein (PN) component in EPS increased from 80.3 to 87.8 mg/g volatile suspended solids (VSS) during cultivation, which might be favorable for sludge granulation and heavy metal(loid) removal. Batch experiments showed that Mn-AGS was better at oxidizing As(III)/Sb(III) into less toxic As(V)/Sb(V) than traditional AGS. Remarkably, the results indicated that Mn-AGS did not oxidize Cr(III) but was able to reduce Cr(VI) into relatively harmless Cr(III). This work provided a new promising method with which to treat As(III), Sb(III), and Cr(VI) in wastewaters.
As、Sb 和 Cr 是氧化还原敏感和有毒的重金属（类金属），并且氧化还原反应通常涉及含有这些元素的基质的处理。在这项研究中，通过在序批式反应器（SBR）中连续向污泥中添加 Mn(II)，获得了好氧颗粒污泥（Mn-AGS）。对所得污泥进行了形态观察以及细胞外聚合物（EPS）、Mn 价态和微生物群落的分析。经过 50 天的培养，生物生成的 Mn(III,IV)氧化物（bio-MnO）积累至约 25 mg Mn/g 悬浮固体（SS）。X 射线光电子能谱（XPS）表明 Mn(III,IV)的百分比为 87.6%。在培养过程中，EPS 中的蛋白质（PN）组分从 80.3 增加到 87.8 mg/g 挥发性悬浮固体（VSS），这可能有利于污泥颗粒化和重金属（类金属）去除。批量实验表明，Mn-AGS 比传统 AGS 更能将 As(III)/Sb(III)氧化成毒性较小的 As(V)/Sb(V)。值得注意的是，结果表明 Mn-AGS 不会氧化 Cr(III)，但能够将 Cr(VI)还原为相对无害的 Cr(III)。这项工作提供了一种处理废水中 As(III)、Sb(III)和 Cr(VI)的有前途的新方法。
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