State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
J Hazard Mater. 2010 Apr 15;176(1-3):697-703. doi: 10.1016/j.jhazmat.2009.11.088. Epub 2009 Dec 16.
Batch experiments were conducted to remove Cr(VI) from aqueous solution using activated sludge biomass. The effects of acid pretreatment of the biomass, initial pH, biomass and Cr(VI) concentrations on Cr(VI) removal efficiency were investigated. Proton consumption during the removal process and the reducing capacity of sludge biomass were studied. The results show that acid pretreatment could significantly improve Cr(VI) removal efficiency and increase Cr(VI) reducing capacity by 20.4%. Cr(VI) removal was remarkably pH-dependent; lower pH (pH=1, 2) facilitated Cr(VI) reduction while higher pH (pH=3, 4) favored sorption of the converted Cr(III). Lower Cr(VI) concentration as well as higher biomass concentration could accelerate Cr(VI) removal. Cr(VI) reduction was not the only reason for proton consumption in the removal process. Pseudo-second-order adsorption kinetic model could successfully simulate Cr(VI) removal except under higher pH conditions (pH=3, 4).
采用活性污泥生物量进行了批量实验，以从水溶液中去除 Cr(VI)。考察了生物量的酸预处理、初始 pH 值、生物量和 Cr(VI)浓度对 Cr(VI)去除效率的影响。研究了去除过程中的质子消耗和污泥生物量的还原能力。结果表明，酸预处理可以显著提高 Cr(VI)去除效率，并将 Cr(VI)还原能力提高 20.4%。Cr(VI)去除显著依赖于 pH 值；较低的 pH 值（pH=1、2）有利于 Cr(VI)的还原，而较高的 pH 值（pH=3、4）有利于转化的 Cr(III)的吸附。较低的 Cr(VI)浓度和较高的生物量浓度可以加速 Cr(VI)的去除。Cr(VI)的还原不是去除过程中质子消耗的唯一原因。除了在较高 pH 值条件下（pH=3、4）外，准二级吸附动力学模型可以成功模拟 Cr(VI)的去除。
