剩余污泥吸附Cu2+、Cd2+试验

Experimental study on adsorption of Cu2+ and Cd2+ by residual sludge

摘要:

为研究剩余污泥的有效利用,通过实验室静态吸附试验,研究剩余污泥对Cu2+、Cd2+溶液的吸附特性及影响因素.结果表明,吸附过程中pH值、污泥量、吸附时间和初始溶液质量浓度对吸附效率均有影响,pH值是吸附过程的最重要因素,增加投泥量和提高pH值可以明显提高吸附量,而温度对污泥吸附的影响并不显著.吸附热力学数据表明,污泥对Cu2+、Cd2+的吸附较好地符合Langmuir和Freundlich模型,最大吸附容量分别为32.4mg/g和30.2mg/g.剩余污泥能够作为重金属离子的吸附剂.

Abstract:

For effective utilization of residual sludge,biosorption experiments of Cu2+ and Cd2+ were carried out using waste activated sludge from municipal sewage treatment plant as adsorption material,and the effects of pH value,temperature,reaction time,sludge quantity and initial solution concentration on the adsorption efficiency were studied through static state experiment.Results indicate that temperature has no significant effect on the adsorption,while pH value is the most important factor in the adsorption process and the increase of sludge quantity will enhance the adsorption capacity greatly.Besides,the adsorption process of Cu2+ and Cd2+ is in accordance with Langmuir isotherm and Freundlich model,and the maximum adsorption amounts at room temperature(20±2℃) are 32.4 mg/g and 30.2 mg/g respectively.It is indicated that the residual sludge can be used as an effective biosorbent for the removal of heavy metals.