ABSTRACT

The efficiency of Saccharomyces cerevisiae in the removal of heavy metals from effluents was tested using one real and four synthetics nickel-containing effluents. The removal of metal ions from synthetic effluents was studied as a function of pH, interaction time, nickel concentration and temperature. Characterisation of biosorption equilibrium was evaluated employing the Langmuir, Freundlich and Temkin models. The maximum sorption capacity of biomass for Ni(II) was 8.9 mg/g in Ni(II) system, 8.3 mg/g in Ni(II)–Cr(VI)–Fe(III), 11.9 mg/g in Ni(II)–Zn(II)–Sr(II)–Cu(II) and 7.3 in Ni(II)–Zn(II)–Cu(II)–Mo(VI) systems. The kinetics of the biosorption was described using pseudo-first order, pseudo-second order, Elovich model and the intra-particle Weber and Morris diffusion models. According to the thermodynamic parameters the biosorption can be described as a spontaneous process. Fourier-transform infrared analysis was carried out to identify the role of functional groups on metal ions binding. To determine the main metal species present in the solution at different pH values, thermodynamic calculations were performed. The effect of pH and sorbent dosage on metal removal from real industrial effluent was investigated. The two-stage sequential scheme of Ni(II) removal from effluent by the addition of different dosage of new biomass sorbent was proposed.

摘要

酿酒酵母的功效使用一种真实的和四种合成的含镍废水测试了废水中重金属的去除率。研究了pH值，相互作用时间，镍浓度和温度对合成废水中金属离子去除的影响。使用Langmuir，Freundlich和Temkin模型评估生物吸附平衡的特征。Ni（II）系统中生物质对Ni（II）的最大吸附能力为8.9 mg / g，Ni（II）-Cr（VI）-Fe（III）中为8.3 mg / g，Ni（II）中为11.9 mg / g Ni（II）-Zn（II）-Cu（II）-Mo（VI）体系中的II）–Zn（II）–Sr（II）–Cu（II）和7.3。使用伪一级，伪二级，Elovich模型以及粒子内韦伯和莫里斯扩散模型描述了生物吸附的动力学。根据热力学参数，生物吸附可以描述为自发过程。进行了傅里叶变换红外分析，以确定官能团在金属离子结合上的作用。为了确定在不同pH值下溶液中存在的主要金属种类，进行了热力学计算。研究了pH和吸附剂用量对从实际工业废水中去除金属的影响。提出了通过添加不同剂量的新生物质吸附剂从废水中去除Ni（II）的两阶段顺序方案。