摘要
从某铜矿选矿废水中筛选分离出一株在强酸性条件下对铜去除能力较高的菌株Z-1,经鉴定为克雷伯氏杆菌.考察了碳源、氮源、pH、温度、吸附时间、投菌量等因素对菌株Z-1生长量及吸附Cu2+的影响.结果表明,菌株Z-1的最佳碳源为乙酸钠,其最佳用量为3 g.L-1;最佳氮源为硫酸铵,最佳用量为1.2 g.L-1.在投菌量为4 g.L-1、温度为30℃、吸附时间为4 h的条件下,菌株Z-1对pH=3、Cu2+100 mg.L-1的废水吸附效果最优,Cu2+去除率达到59.7%.菌株Z-1对Cu2+的吸附过程能很好地用吸附模型Langmuir方程描述,菌株Z-1去除的铜离子,有92.3%分布在细胞壁上,其余7.7%分布在细胞质内,说明菌株Z-1对铜离子的去除主要为表面吸附.
A strains named Z-1 which was separated from the drainage ditch sludge of some copper mine has good removal effect of Cu2~ under the strong acid condition. It was identified as Klebsiella oxytoca. Many influence factors for growth of the strain Z-1 and adsorption of Cu2＋ were discussed in this paper. Results indicate that the best carbon source of the strain Z- 1 is sodium acetate with the concentration of 3 g· L^-1 and the best nitrogen source is ammonium sulphate with the concentration of 1.2 g· L^-1. In a solution with pH 3.0 and the adsorption of Cu2＋by the Z- 1 strain very well and 92.3 % of the removed copper ions were on the cell wall and the remaining 7.7% were located in the cytoplasm, which indicates that the removal of copper ions of the strain Z-1 is mainly due to surface adsorption.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第4期599-604,共6页
Environmental Chemistry
基金
环保部环保公益性行业科研专项资助(201209013)资助
关键词
矿山酸性废水
重金属铜离子
耐酸性
微生物吸附
acid mine drainage, heavy metal copper ions, acid resistance, microbial adsorption.
