Bioremediation of Heavy Metal Ions by Phosphate-mineralization Bacteria and Its Mechanism
Bioremediation of Heavy Metal Ions by Phosphate-mineralization Bacteria and Its Mechanism
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磷酸盐矿化细菌对重金属离子的生物修复及其机制
DOI：
10.1002/jccs.201600002
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发表时间：
2016
影响因子：
1.8
通讯作者：
Zhan Qiwei
中科院分区：
文献类型：
--
作者：
Qian Chunxiang;Zhan Qiwei
磷酸盐矿化细菌(PMB)修复重金属离子是一种新型的绿色环保方法，它依赖于微生物诱导的磷酸盐沉淀，并能阻止重金属离子的迁移。分别从控制培养时间、控制pH值、控制环境条件和控制重金属离子四个方面对PMB的生长进行了研究。同时，分析了四种常见重金属离子对磷酸盐的矿化沉淀作用及机理。实验结果表明，在最初的5 小时内，PMB没有立即生长，在13 小时后达到最快的繁殖率。随着PM0B的生长，PMB溶液的pH值从7.0逐渐升高到8.6，在成矿过程中起着重要的作用。当温度为30 °C、pH为8、重金属离子浓度较低时，菌体生长最快。结果表明，过高或过低的温度和pH以及高浓度的重金属离子都会抑制PMB的繁殖。通过PMB诱导底物分解从而有效矿化重金属离子的过程，获得了稳定的大颗粒磷矿化沉淀物，其粒径可达10微米以上。
Bioremediation of heavy metal ions by phosphate‐mineralization bacteria (PMB), as a new green and en‐ vironmental method, relies on microbe‐inducing phosphate precipitation and can prevent heavy metal ions from transferring. The growth of PMB was investigated via four aspects respectively — the control of incubation time, pH value, environmental conditions, and heavy metal ions. At the same time, phosphatemineralization precipitations and mechanism of four common kinds of heavy metal ions were analyzed. The experimental results indicated that PMB didn’t grow immediately in the first 5 hours, and they reached to the fastest reproduction rate after 13 hours. The pH value of PMB solution increased gradually from 7.0 to 8.6 when PM0B grew, which plays an important role in the mineralization process. PMB could grow most rapidly at 30 °C, pH of 8 and low concentration of heavy metal ions. It showed that too high or too low temperature and pH, as well as high concentration of heavy metal ions, could inhibit the reproduction of PMB. Stable and large particles phosphate‐mineralization precipitation, whose particle size could be more than 10 microns, were obtained by the process that PMB induced substrate to decompose and thus mineralized heavy metal ions effectively.