碳酸盐矿化菌株A固结土壤Cd^(2+)的生物矿化过程  

BIOREMEDIATION PROCESS OF Cd^(2+) REMOVAL FROM SOIL BY BACTERIA A BIOMINERALIZATION

作　　者：成亮[1] 钱春香[1] 王瑞兴[1] 王剑云[1] 

机构地区：[1]东南大学材料科学与工程系,南京211189

出　　处：《硅酸盐学报》2008年第A01期215-221,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50578035)资助项目。

摘　　要：研究菌株A在Cd^(2+)存在条件下的生物矿化行为以及所选用菌株修复Cd^(2+)污染土壤的效果。结果表明:菌株A的脲酶常数K_m为1.231mol/L,Cd^(2+)浓度为0.595 mg/L时,菌株生长良好;随着Cd^(2+)浓度的增加,细菌生长由促进变为抑制。细菌在Cd^(2+)污染的水溶液和土壤中仍具有很强的酶活性。游离态Cd^(2+)能够与细菌新陈代谢产物CO_3^(2-)形成CdCO_3不溶晶体沉淀。通过盆栽实验,经过菌株A对Cd^(2+)污染土壤的处理,有效的降低土壤游离态Cd^(2+)植物体内Cd^(2+)含量。在土壤、水资源处理方面,菌株A在生物矿化固结重金属有着广阔的应用前景。The behavior of biomineralization of bacteria A in the presence of Cd^2＋ and the effect of Cd^2＋ polluted soil repaired by bacteria A were investigated. The results show that while the bacteria A had a high urease constant Km of 1.231 mol/L and the Cd^2＋ concentration was 0.595 mg/L, the bacteria grew well. The growth of bacteria changed from accelerated to restrained with the increase of Cd^2＋ concentration. Bacteria A have high urease activity in Cd^2＋ polluted solution and soil. Free Cd^2＋ ions can react with CO3^2- induced by bacteria urease to form insoluble CdCO3 crystals. By pot experiment, the Cd^2＋ content in soil and Cd^2＋ concentration in wheat can be efficiently reduced after the polluted soil was recovered by bacteria A culture medium. The extensive prospect of applying bacteria A to soil and water remediation has been shown.

关 键 词：生物矿化 生物修复 碳酸镉 土壤 

分 类 号：TU526[建筑科学—建筑技术科学]