用阴极放大的电-生物膜固定床反应塔处理含Zn^(2+)废水

Purifing Zn^(2+) organic wastewater in magnify cathode bio-electro fixed-bed reaction tower

经Zn2+驯化所得的功能混合菌,在陶瓷小球表面挂膜后置于电-生物反应器内.考察该反应器在间歇实验与连续实验过程中对于Zn2+的去除效果,并对吸附时间、Zn2+初始质量浓度和溶液pH值等实验条件对Zn2+吸附率的影响进行了分析.结果表明:在间歇实验中,当Zn2+初始质量浓度较高时,吸附很快达到饱和,吸附率随之下降,低初始质量浓度下生物膜对重金属离子的吸附未达到饱和,对吸附率影响不大;pH值在7～9范围内时,吸附效果最好;连续实验进行44 h后,出水口处重金属离子吸附率达到了稳定;同间歇处理废水方法相比,连续流程处理的重金属离子总量大大增加,但达到稳定平衡所需时间较长,处理效果较差.

The pottery ball which filled with functional microbe acclimatized by Zn^2＋ is put in bio-electro fixed-bed reaction tower as biofilm carriers to inspect the adsorption effect of reaction tower for Zn^2＋ in the interim experiment and continuous process. The influences of adsorption time, initial concentration of Zn^2＋. and pH value of solution on Zn^2＋ adsorption efficiency are analyzed. The experimental results show that, in interim experiment, when initial concentration at high level, Zn^2＋ reach to adsorption saturation quickly and adsorption rate decrease at the same time. Zn^2＋ at low initial concentration do not reach to adsorption saturation and has little influences on adsorption rate. The best adsorption effect appeared at the range of pH value 7 to 9. Zn^2＋ adsorption rate steady gradually after 44 h continuously run at water exit. Compared with interim experiment, biofilm can adsorb more Zn^2＋ in continuous process, but the latter cost more time to get to adsorption balance and obtain poor adsorption effect.