Flocculation Efficiency and Mechanism of Carbamazepine by Microbial Flocculant Extracted from Klebsiella pneumoniae J1.

IF 2.3 4区生物学 Q3 MICROBIOLOGY

Archaea-An International Microbiological Journal Pub Date : 2020-11-18 eCollection Date: 2020-01-01 DOI:10.1155/2020/8811516

Jie Xing, Nanzhe Song, Xiangwei Chen, Ang Li, Hongwei Ni

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引用次数: 5

Abstract

The microbial flocculant (MFX) extracted from Klebsiella pneumoniae J1 was used to remove carbamazepine in prepared wastewater and domestic sewage. The influence factors and flocculation mechanism were studied. The optimal carbamazepine removal conditions for MFX were pH of 7-8, 7 mL of flocculant, 0.1 mL of coagulant, and 35°C, and the removal rate reached 81.75%. MFX was efficient in the removal of carbamazepine in both domestic sewage (75.03%) and secondary sedimentation tank effluent (69.76%). The pseudo-first-order kinetic equation fitted the adsorption process better than the pseudo-second-order kinetic equation, which suggested that the adsorption was not pure chemical adsorption. The analysis of floc size suggested that the repulsive force between carbamazepine and MFX was weakened under alkalescent conditions, which can help the growth and coherence of flocs and increase the carbamazepine removal efficiency. Enough dosage of MFX can generate larger flocs, but excessive dosage of MFX will decrease the carbamazepine removal rate because of increase in electrostatic repulsion. The analysis of 3D-EEM and FTIR suggested that hydroxyl, amino, and carboxyl in MFX played an important role in the removal of carbamazepine. As an eco-friendly and highly efficient microbial flocculant, MFX has potential for practical applications in carbamazepine removal.

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肺炎克雷伯菌微生物絮凝剂对卡马西平的絮凝效果及机理研究

用从肺炎克雷伯菌J1中提取的微生物絮凝剂(MFX)去除制备废水和生活污水中的卡马西平。对影响因素和絮凝机理进行了研究。MFX对卡马西平的最佳去除条件为pH 7 ~ 8、絮凝剂7 mL、絮凝剂0.1 mL、35℃，去除率达81.75%。MFX对生活污水(75.03%)和二沉池出水(69.76%)的卡马西平去除率均较高。拟一级动力学方程比拟二级动力学方程更符合吸附过程，说明吸附不是纯化学吸附。对絮凝体粒径的分析表明，在碱性条件下，卡马西平与MFX之间的斥力减弱，有利于絮凝体的生长和凝聚，提高卡马西平的去除率。适量的MFX可以产生较大的絮凝体，但过量的MFX会由于静电斥力的增加而降低卡马西平的去除率。3D-EEM和FTIR分析表明，MFX中的羟基、氨基和羧基在卡马西平的去除中起重要作用。作为一种环保高效的微生物絮凝剂，MFX在卡马西平的去除中具有潜在的实际应用价值。

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来源期刊

Archaea-An International Microbiological Journal MICROBIOLOGY-

CiteScore

7.50

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Archaea is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles dealing with all aspects of archaea, including environmental adaptation, enzymology, genetics and genomics, metabolism, molecular biology, molecular ecology, phylogeny, and ultrastructure. Bioinformatics studies and biotechnological implications of archaea will be considered. Published since 2002, Archaea provides a unique venue for exchanging information about these extraordinary prokaryotes.