研究报告
张双圣,刘汉湖,张双全,罗鹏,邱超.污泥吸附剂的制备及其对含Pb2+模拟废水的吸附特性研究[J].环境科学学报,2011,31(7):1403-1412
污泥吸附剂的制备及其对含Pb2+模拟废水的吸附特性研究
- Lead adsorption properties of a sludge adsorbent prepared from sludge and coal
- 基金项目：江苏省级科技创新与成果转化(自然科学基金)专项引导资金项目(No.BK2009097)
- 作者
- 单位
- 张双圣
- 1. 中国矿业大学 江苏省资源环境信息工程重点实验室, 徐州 221116;
2. 中国矿业大学环境与测绘学院, 徐州 221116
- 刘汉湖
- 1. 中国矿业大学 江苏省资源环境信息工程重点实验室, 徐州 221116;
2. 中国矿业大学环境与测绘学院, 徐州 221116
- 张双全
- 中国矿业大学化工学院, 徐州 221116
- 罗鹏
- 中国矿业大学化工学院, 徐州 221116
- 邱超
- 1. 中国矿业大学 江苏省资源环境信息工程重点实验室, 徐州 221116;
2. 中国矿业大学环境与测绘学院, 徐州 221116
- 摘要：以污水处理站脱水污泥和煤为原料,通过共热解法制备污泥吸附剂,并将其用于吸附含Pb2+的模拟废水.同时,考察了污泥吸附剂制备过程中热解温度、配比、热解时间、粒径对碘吸附值及产率的影响,以及吸附时间、温度、pH值、污泥吸附剂投加量对吸附效果的影响,并对其吸附动力学和热力学特性进行了探讨.结果表明,制备污泥吸附剂的最佳条件为热解温度900 ℃,煤在混合样中的比例为20%,热解时间保持60 min,粒径为10~20目.所制备的污泥吸附剂的碘吸附值为321.62 mg · g-1,产率为44.85%,比表面积为189.23 m2 · g-1.污泥吸附剂对Pb2+的吸附量均随着吸附时间、温度、pH、投加量的增加而增大,并逐渐趋于平衡.污泥吸附剂对Pb2+的吸附动力学比较符合伪二级吸附动力学方程、二阶段吸附动力学方程,颗粒内扩散过程是吸附速率的控制步骤,但不是唯一的速率控制步骤.Langmuir等温方程比Freundlich等温方程更适合于描述此吸附行为.
- Abstract：A sludge adsorbent was prepared by pyrolysis from wastewater treatment plant sludge and coal. The adsorbent was used to adsorb Pb2+ from simulated wastewater. The influences of pyrolysis temperature, mass ratio of coal with sludge, pyrolysis time and diameter of particles on iodine adsorption value and yield were studied,as well as adsorption time, temperature, pH values and the adsorbent amount on adsorption effect. The optimum conditions for the preparation of sludge adsorbent were a pyrolysis temperature of 900℃, mass ratio of coal of 20%, pyrolysis time of 60 min, and diameter of particles 10~20 mesh. The iodine absorption value of sludge adsorbent is 321.62 mg · g-1, the yield is 44.85%, and the specific surface area is 189.23 m2 · g-1. The adsorption of Pb2+ increases with the adsorption time, temperature, pH value and adsorbent amount, until equilibrium is reached. The adsorption kinetics of Pb2+ in the sludge adsorbent accords with the pseudo-second-order kinetics equation and the two-step adsorption kinetics rate equation. The adsorption rate is not only controlled by intra-particle diffusion but also by extra-particle diffusion. Compared with the Freundlich isotherm equation, the Langmuir isotherm equation is more appropriate to describe the adsorption behavior.
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