解糖假苍白杆菌还原六价铬的特性及条件优化
Characteristics and condition optimization of hexavalent chromium reduction by pseudochrobactrum saccharolyticum
从湖南省长沙市废弃铬盐厂的土壤中成功分离出一株具有高Cr(Ⅵ)抗性和去除率的菌株W1。通过16S rDNA基因序列和DNA G+C mol%含量测定,该菌株被鉴定为假苍白杆菌属(Pseudochrobactrum)革兰氏阴性杆菌。研究探讨了不同初始温度(25~40℃)、pH(7.5~11.0)和Cr(Ⅵ)(0~3 000 mg/L)浓度下对菌株生长及Cr(Ⅵ)去除效果的影响,并分析了胞外多聚物(EPS)与去除效率的关联。结果表明,从铬渣中分离出的菌株W1的最适生长及Cr(Ⅵ)去除条件为温度35℃、pH=9.5;其对Cr(Ⅵ)的最低抑菌浓度约为2 500 mg/L,在1 000 mg/L Cr(Ⅵ)处理下56 h内去除率高达71.54%,且此时EPS产量最高(357.14 mg/g),其中蛋白质为主要组分,与Cr(Ⅵ)去除呈正相关。该菌株在高浓度Cr(Ⅵ)污染场地的微生物修复中具有良好应用前景。
A strain W1 with high Cr(Ⅵ) resistance and removal rate was successfully isolated from chromium-contaminated soil from an abandoned chromium salt factory in Changsha,Hunan Province.Through 16S rDNA gene sequence and DNA G+C mol% content determination,the strain was identified as a Gram-negative bacterium of the genus Pseudochrobactrum.The study investigated the effects of different initial temperatures (25-40℃),pH (7.5-11.0),and Cr(Ⅵ) concentrations (0-3 000 mg/L) on bacterial growth and Cr(Ⅵ) removal efficiency,and analyzed the correlation between extracellular polymeric substances (EPS) and removal efficiency.The results showed that the optimal growth and Cr(Ⅵ) removal conditions for strain W1 isolated from chromium slag were temperature of 35℃ and pH 9.5;Its minimum inhibitory concentration for Cr(Ⅵ) is about 2 500 mg/L,and the removal rate reaches 71.54% within 56 hours under 1 000 mg/L Cr(Ⅵ) treatment.At this time,EPS production is the highest (357.14 mg/g),with protein as the main component,positively correlated with Cr(Ⅵ) removal.This strain has good application prospects in microbial remediation of high concentration Cr(Ⅵ) contaminated sites.
六价铬[Cr(Ⅵ)] / 假苍白杆菌 / 分离 / 鉴定 / 抗性
hexavalent chromium[Cr(Ⅵ)] / pseudochrobactrum / isolation / identification / resistance
| [1] |
|
| [2] |
|
| [3] |
杨宇, 高宇, 程潜, |
| [4] |
王文婧, 卢松霖, 刘雪, |
| [5] |
陈少金, 刘仕柏, 梁健敏, |
| [6] |
牛永艳, 陈正军, 赵帅, |
| [7] |
朱培蕾, 焦仕林, 姜朴, |
| [8] |
|
| [9] |
潘俊, 董欣, 王兴作. 一株新型Lysinibacillus fusiformis菌株G5M11b对Cr(Ⅵ)的还原性能研究[J]. 安全与环境学报, 2024, 24(10):4062-4070. |
| [10] |
姜毅, 汤鼎, 周宇诚, |
| [11] |
吴卿, 李倩男, 张颖, |
| [12] |
王广顺, 张皓璠, 唐晨, |
| [13] |
赵光辉, 常文越, 李雄勇, |
| [14] |
徐淑霞, 王晓雅, 张来星, |
| [15] |
吴磊, 张学洪, 李宁杰, |
| [16] |
|
| [17] |
牟杨龙, 张振华, 辜丽军, |
| [18] |
潘星时, 韦业成, 芦耀波, |
| [19] |
魏复盛. 水和废水监测分析方法(第四版)[M]. 北京: 中国环境科学出版社,2002:180-183. |
| [20] |
|
| [21] |
徐彦, 方先芝, 陈俊辉, |
| [22] |
|
| [23] |
李维宏, 杨宁, 魏晓峰, |
| [24] |
胡永娟, 李学梅, 王海磊, |
| [25] |
|
| [26] |
韩剑宏, 宋玉艳, 张铁军, |
| [27] |
孙梦格, 宋卫锋, 杨佐毅, |
国家自然科学基金(31370053)
/
| 〈 |
|
〉 |