Metal oxyanion removal from wastewater using manganese-oxidizing aerobic granular sludge
Metal oxyanion removal from wastewater using manganese-oxidizing aerobic granular sludge
复制标题
锰氧化好氧颗粒污泥去除废水中的金属氧阴离子
DOI：
10.1016/j.chemosphere.2019.07.124353
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Pan Xiangliang
中科院分区：
文献类型：
--
作者：
He Zhanfei;Wei Zhen;Zhang Qingying;Zou Jinte;Pan Xiangliang
As， Sb和Cr是氧化还原敏感和有毒的重金属（类）s，氧化还原反应通常涉及到含有这些元素的底物的处理。本研究采用序批式反应器（SBR），在污泥中连续添加Mn(II)，制备锰氧化好氧颗粒污泥（Mn- ags）。形态学观察，分析细胞外聚合物质（EPS）， Mn价态和微生物群落进行了产生的污泥。经过50天的培养，生物源Mn（III，IV）氧化物（bio-MnOx）积累高达约25 mg Mn/g悬浮固体（SS）。x射线光电子能谱（XPS）显示，Mn（III，IV）的含量为87.6%。培养过程中，EPS中蛋白质（PN）含量从80.3 mg/g增加到87.8 mg/g，有利于污泥颗粒化和去除重金属（loid）。批量实验表明，Mn-AGS比传统AGS更能将As(III)/Sb（III）氧化为毒性更小的As(V)/Sb(V)。值得注意的是，Mn-AGS没有氧化Cr(III)，但能够将Cr（VI）还原成相对无害的Cr（III）。本研究为处理废水中As（III）、Sb（III）和Cr（VI）提供了一种有前景的新方法。
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-MnOx) 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.