Rapid Production of a Novel Al(III) Dependent Bioflocculant Isolated From Raoultella ornithinolytica 160-1 and Its Application Combined With Inorganic Salts.
Rapid Production of a Novel Al(III) Dependent Bioflocculant Isolated From Raoultella ornithinolytica 160-1 and Its Application Combined With Inorganic Salts.
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DOI：
10.3389/fmicb.2020.622365
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发表时间：
2020
影响因子：
5.2
通讯作者：
Hong J
中科院分区：
文献类型：
--
作者：
Ding R;Luo L;Han R;Zhang M;Li T;Tang J;Huang S;Hong J
通过16S rRNA和质谱分析，鉴定出一株高效的微生物絮凝剂产生菌--溶解鸟氨酸拉氏杆菌160-1。通过响应曲面法优化，获得了投加量为10.01g/(L⋅d)的生物絮凝剂EPS160的快速生产。在Al(III)的辅助下，投加量为8 mg/L的EPS-160在5min内可达到90%以上的絮凝活性。因此，这种新型的依赖于Al(III)的生物絮凝剂被用于与化学混凝剂AlCl3结合去除高岭土悬浮液和废水处理。结果表明，在聚合体系中加入EPS160，不仅比单独使用化学絮凝剂(30%以上)有较大的絮凝效果，而且克服了AlCl3投加量过大导致的絮凝活性下降，保持了AlCl3在较大范围内(11~23 mg/L)的最佳投加量。Zeta电位和EPS-160结构分析表明，高岭土的絮凝机理既有电荷中和作用，也有架桥作用。在废水处理中，由EPS-160和AlCl3组成的复合絮凝剂也具有良好的除浊性能。此外，EPS-160还具有较高的絮凝活性、高温稳定性、耐pH和无毒等特性，显示出很大的应用潜力。
An efficient bioflocculant-producing strain, Raoultella ornithinolytica 160-1, was identified by 16S rRNA and mass spectrometry analyses. Rapid production of bioflocculant EPS-160 was obtained with 10.01 g/(L⋅d) after optimized by response surface methodology. With the aid of Al(III), more than 90% flocculation activity of EPS-160 at 8 mg/L dosage was achieved in 5 min. Thus, this novel Al(III) dependent bioflocculant was used in combined with chemical coagulants AlCl3 to remove kaolin suspensions and wastewater treatment. The results indicated that the addition of EPS-160 in aggregation system not only largely improved the flocculation ability than the individual use of chemical flocculant (over 30 percent), but also overcome the decrease of flocculation activity due to the overdose of AlCl3 and maintained the optimum dosage of AlCl3 in a wide range (11–23 mg/L). The zeta potentials and EPS-160 structure indicated that both charge neutralization and bridging were the flocculation mechanism with kaolin. During the wastewater treatment, this composite flocculants consisted of EPS-160 and AlCl3 also had great performance for turbidity elimination. Moreover, with the properties of high flocculation activity, hyperthermal stability, pH tolerance and non-toxicity, EPS-160 shows great potential applications.
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