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.
作者
徐倩宇
路则洋
甘莉
陈祖亮
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)
出处
《福建师范大学学报(自然科学版)》
CAS
北大核心
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)