摘要：

蛋壳粉对废水中铅和镉的吸附符合Langmuir吸附等温式和拟二级吸附动力学模型，且无明显解吸特征。基于此特征开发出强化吸附工艺，建立了可计算出水浓度的强化吸附数学模型，并进行了实验验证。当铅和镉的初始质量浓度为10 mg/L，经强化吸附后，铅和镉出水平均质量浓度分别为0.88 mg/L和0.98 mg/L，且实验值与模型计算值吻合良好。相比于传统吸附，铅和镉的出水平均质量浓度可分别降低14.54%和44.58%。

关键词: 蛋壳粉, 铅, 镉, 强化吸附

Abstract:

The adsorption process of eggshell powder for lead and cadmium in wastewater complies with Langmuir adsorption isotherm and pseudo-second-order kinetic model and has no obvious desorption characteristics. Based on these adsorption characteristics, an enhanced adsorption process was developed, and a mathematical model which could calculate the effluent concentration was established and verified through experiments. When the initial concentrations of lead and cadmium were 10 mg/L, the average effluent concentrations after enhanced adsorption were 0.88 mg/L and 0.98 mg/L, respectively, and the experimental values were in good agreement with the model calculations. Compared with traditional adsorption, the average effluent concentration of lead and cadmium could be reduced by 14.54% and 44.58% respectively.

Key words: eggshell powder, lead, cadmium, enhanced adsorption

中图分类号: 

• X703.1