Department of Building, Civil and Environmental Engineering, Concordia University, 1455 de Maisonneuve Boulevard W., EV6-187 Montreal, Quebec, Canada.
J Hazard Mater. 2011 Jun 15;190(1-3):486-92. doi: 10.1016/j.jhazmat.2011.03.070. Epub 2011 Mar 29.
The potential of an anaerobic sludge from an anaerobic wastewater treatment plant to remediate (inorganic) arsenic contaminated water was evaluated. The granular biomass was chemically modified as PO(4)-biomass and Cl-biomass. The biomass was then investigated in equilibrium batch experiments and continuous flow fixed-bed column operation. Initial arsenic concentration, contact time and solution pH affected the biosorption capacity. Arsenate exhibited greater removal rates than arsenite. Adsorption data fitted better with the Langmuir than the Freundlich isotherm model. Kinetic data followed a pseudo-second-order model. In column operation, at pH 5, 90 and 220 bed volumes of water with the respective arsenate concentrations of 500 and 200 μg/L were treated. Desorption of almost 40% arsenate was achieved by using 0.5M NaCl solution. Protein/amino acid-arsenic interaction was proposed as the dominant mechanism in the biosorption process. The arsenic-laden biomass satisfied USEPA's Toxicity Characteristic Leaching Procedure (TCLP) test and can be safely disposed of as non-hazardous waste.
评估了来自厌氧废水处理厂的厌氧污泥修复（无机）砷污染水的潜力。将颗粒状生物质化学修饰为 PO(4)-生物质和 Cl-生物质。然后在平衡批实验和连续流动固定床柱操作中研究了生物质。初始砷浓度、接触时间和溶液 pH 影响生物吸附能力。砷酸盐的去除率高于亚砷酸盐。吸附数据更符合 Langmuir 模型，而不是 Freundlich 等温线模型。动力学数据遵循拟二级模型。在柱操作中，在 pH 值为 5、90 和 220 床体积下，处理了相应砷酸盐浓度为 500 和 200 μg/L 的水。使用 0.5M NaCl 溶液可实现近 40%的砷酸盐解吸。提出了蛋白质/氨基酸-砷相互作用作为生物吸附过程中的主要机制。含砷生物质满足美国环保署的毒性特征浸出程序 (TCLP) 测试，可以安全地作为无害废物处理。
