Orozco A Micaela Ferro, Contreras Edgardo M, Zaritzky Noemí E
Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET, Fac. de Cs. Exactas, UNLP. 47 y 116 (B1900AJJ), La Plata, Argentina.
J Hazard Mater. 2008 Jan 15;150(1):46-52. doi: 10.1016/j.jhazmat.2007.04.043. Epub 2007 Apr 20.
The combined carbon-activated sludge process has been proposed as an alternative to protect the biomass against toxic substances in wastewaters; however, the information about the effect of powdered-activated carbon (PAC) addition in activated sludge reactors for the treatment of wastewaters containing Cr(VI) is limited. The objectives of the present study were: (a) to evaluate the removal of hexavalent chromium by (i) activated sludge microorganisms in aerobic batch reactors, (ii) powdered-activated carbon, and (iii) the combined action of powdered-activated carbon and biomass; (b) to propose mathematical models that interpret the experimental results. Different Cr(VI) removal systems were tested: (S1) biomass (activated sludge), (S2) PAC, and (S3) the combined activated carbon-biomass system. A Monod-based mathematical model was used to describe the kinetics of Cr(VI) removal in the system S1. A first-order kinetics with respect to Cr(VI) and PAC respectively, was proposed to model the removal of Cr(VI) in the system S2. Cr(VI) removal in the combined carbon-biomass system (S3) was faster than both Cr(VI) removal using PAC or activated sludge individually. Results showed that the removal of Cr(VI) using the activated carbon-biomass system (S3) was adequately described by combining the kinetic equations proposed for the systems S1 and S2.
已提出联合碳-活性污泥工艺作为一种保护生物质免受废水中有毒物质影响的替代方法；然而，关于在活性污泥反应器中添加粉末活性炭（PAC）以处理含六价铬（Cr(VI)）废水的效果的信息有限。本研究的目的是：（a）评估通过（i）好氧间歇反应器中的活性污泥微生物、（ii）粉末活性炭和（iii）粉末活性炭与生物质的联合作用去除六价铬；（b）提出解释实验结果的数学模型。测试了不同的Cr(VI)去除系统：（S1）生物质（活性污泥）、（S2）PAC和（S3）活性炭-生物质联合系统。基于莫诺德方程的数学模型用于描述系统S1中Cr(VI)去除的动力学。分别针对Cr(VI)和PAC提出了一级动力学模型，以模拟系统S2中Cr(VI)的去除。碳-生物质联合系统（S3）中Cr(VI)的去除速度比单独使用PAC或活性污泥去除Cr(VI)的速度都要快。结果表明，通过结合为系统S1和S2提出的动力学方程，可以充分描述使用活性炭-生物质系统（S3）去除Cr(VI)的情况。
