固定化脱氮副球菌同时去除硝酸盐和重金属锌离子  

Simultaneously Removal Nitrate and Zn2+ by Immobilized Paracoccus

作　　者：徐倩宇 路则洋 甘莉[1] 陈祖亮[1] XU Qianyu;LU Zeyang;GAN Li;CHEN Zuliang(Fujian Key Laboratory of Pollution Control and Resource Reuse,School of Environmental Science and Engineering,Fujian Normal University,Fuzhou 350007,China)

机构地区：[1]福建省污染控制与资源循环利用重点实验室福建师范大学环境科学与工程学院

出　　处：《福建师范大学学报（自然科学版）》2020年第1期35-41,共7页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省科技厅重点项目(2016Y0026)

摘　　要：采用将脱氮副球菌Paracoccus strain YF1固定在竹炭上,以达到同时提高硝酸盐和重金属锌的去除效率的目的.实验结果表明:在最佳炭化温度600℃的条件下,改性竹炭对0.5 mmol·L^-1 Zn^2+的去除率接近100%,对5 mmol·L^-1硝酸盐去除率为20%.培养基中单独加入硝酸盐或Zn^2+,或者同时加入硝酸盐和Zn^2+时,24 h时固定化菌对两者去除效率都达到96%以上;而竹炭对Zn^2+的去除效率均达到99%,对硝酸盐的去除率都小于24%;游离菌对Zn^2+基本没有去除作用,对硝酸盐去除由于Zn^2+共存,从96%降低到81%.固定化菌对Zn^2+的吸附符合伪二级动力学模型,对硝酸盐符合零级动力学模型.此外,固定化菌重复利用5次,前3次对5 mmol·L^-1硝酸盐和0.5 mmol·L^-1Zn^2+的去除率均高于96%,第4次开始,去除率有所下降.In order to achieve simultaneous effectively removal of nitrate and heavy metal Zn^2+, the immobilized Paracoccus strain YF1 on bamboo charcoal were proposed. The results showed that the removal efficiency of 0.5 mmol·L^-1 Zn^2+ using modified bamboo charcoal was up to 100%, and the removal efficiency of 5 mmol·L^-1 nitrate was only 20% under the optimal carbonization temperature of bamboo charcoal at 600 ℃. Whether nitrate and Zn^2+ was added respectively, or nitrate and Zn^2+ were added simultaneously, the removal efficiencies of nitrate and Zn^2+ by immobilized bamboo charcoal reached more than 96% at 24 h;the removal efficiency of aseptic bamboo charcoal on Zn^2+ reached 99%, and the removal rate of nitrate was less than 24%. Free bacteria had little effect on the removal of Zn^2+, while nitrate removal decreased from 96% to 81% due to the coexistence of Zn^2+. The adsorption of Zn^2+ by immobilized bamboo charcoal was fit with pseudo-second-order kinetic model and zero-order kinetic model for nitrate. In addition, the removal efficiencies of 5 mmol·L^-1 nitrate and 0.5 mmol·L^-1 Zn^2+ were higher than 96% by 3 recycles of the immobilized cells, and decreased at fourth recycle.

关 键 词：脱氮副球菌Paracoccus strain YF1 固定化 竹炭 硝酸盐 重金属锌离子 

分 类 号：X172[环境科学与工程—环境科学] X703