Enhanced azo dye removal in a continuously operated up-flow anaerobic filter packed with henna plant biomass.
Enhanced azo dye removal in a continuously operated up-flow anaerobic filter packed with henna plant biomass.
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DOI：
10.1016/j.jhazmat.2015.05.044
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发表时间：
2015-12
影响因子：
13.6
通讯作者：
Jingang Huang;Mengke Wu;Jianjun Chen;Xiuyan Liu;Tingting Chen;Y. Wen;Junhong Tang;Zhengmiao Xie-Zhengmiao
中科院分区：
文献类型：
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作者：
Jingang Huang;Mengke Wu;Jianjun Chen;Xiuyan Liu;Tingting Chen;Y. Wen;Junhong Tang;Zhengmiao Xie-Zhengmiao
研究了在上流式厌氧生物滤池（UAF）中填料指甲花（茎）对偶氮染料（AO7）去除效果的影响。在添加了指甲花的UAF （R2）中，AO7的去除、磺胺酸（SA）的形成以及这些反应（kao7和ksa）的准一级动力学常数（kao7和ksa）均高于不添加指甲花的UAF （R1）。第18天kao7inr1和r2最大值分别为0.0345和0.2024 cm−1；SA生成与AO7去除的摩尔比分别为0.582和0.990。吸附和内源生物还原是r1中主要的AO7去除途径，而inR2生物还原是主要的去除途径。指甲花中的有机物可以释放并发酵成挥发性脂肪酸，作为AO7还原的有效电子供体，通过可溶性和/或固定的法律加速AO7的还原。之后，去除过程随着时间的推移而减弱，表明在UAF的长期运行过程中存在电子捐赠和释放的需求。
Effects of henna plant biomass (stem) packed in an up-flow anaerobic bio-filter (UAF) on an azo dye (AO7) removal were investigated. AO7 removal, sulfanilic acid (SA) formation, and pseudo first-order kinetic constants for these reactions (kAO7andkSA) were higher in the henna-added UAF (R2) than in the control UAF without henna (R1). The maximumkAO7inR1 andR2 were 0.0345 and 0.2024 cm−1, respectively, on day 18; the corresponding molar ratios of SA formation to AO7 removal were 0.582 and 0.990. Adsorption and endogenous bio-reduction were the main AO7 removal pathways inR1, while inR2 bio-reduction was the dominant. Organics in henna could be released and fermented to volatile fatty acids, acting as effective electron donors for AO7 reduction, which was accelerated by soluble and/or fixed lawsone. Afterwards, the removal process weakened over time, indicating the demand of electron donation and lawsone-releasing during the long-term operation of UAF.