The enhancement of pyridine degradation by Rhodococcus KDPy1 in coking wastewater
The enhancement of pyridine degradation by Rhodococcus KDPy1 in coking wastewater
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DOI：
10.1093/femsle/fny271
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发表时间：
2019-01-01
影响因子：
2.1
通讯作者：
Chai, Tuanyao
中科院分区：
文献类型：
--
作者：
Zhang, Yuxiu;Zhang, Yiming;Chai, Tuanyao
吡啶是焦化废水中典型的含氮杂环顽固性有机化合物。从焦化废水处理厂好氧污泥中分离出一株吡啶降解菌KDPy1。基于16S rDNA序列的同源性分析表明，KDPy1属于红球菌属。KDPy1降解吡啶的最适温度为37℃，pH为7 ~ 8℃。菌株KDPy1在48h后对1442 mg/L吡啶的降解率接近99.6%，高浓度1442 mg/L吡啶对其降解无抑制作用。吡啶的降解动力学符合Monod模型。此外，KDPy1在含喹啉和苯酚的合成废水中能有效降解吡啶。KDPy1能降解实际焦化废水中的吡啶，降低总有机碳。结果表明，KDPy1具有提高焦化废水中吡啶去除率的潜力。
Pyridine is a typical nitrogen heterocyclic and recalcitrant organic compound in coking wastewater. The pyridine-degrading bacterial strain KDPy1 was isolated from aerobic sludge in a coking wastewater treatment plant. The homology analysis based on 16S rDNA sequences suggested that KDPy1 belongs to Rhodococcus sp. The optimum temperature and pH for pyridine degradation by KDPy1 were 37 degrees C and 7-8, respectively. The strain KDPy1 degraded 1442 mg/L of pyridine nearly 99.6% after 48 h, and the high concentration of 1442 mg/L pyridine did not show an inhibitory effect on its degradation. The degradation kinetics of pyridine were fitted with the Monod model. Furthermore, KDPy1 was capable of degrading pyridine efficiently in the synthetic wastewater containing quinoline and phenol. KDPy1 could degrade pyridine and reduce the total organic carbon in the real coking wastewater. These results showed that KDPy1 had a potential for improving the removal of pyridine from coking wastewater.