多孔水泥石合成滤料的制备及其污水吸附除磷试验研究.docVIP

多孔水泥石合成滤料的制备及其污水吸附除磷试验研究 摘要：以普通硅酸盐水泥为主要原料，经反应釜高温蒸汽养护制备出多孔水泥石合成滤料。通过正交实验得到最优工艺组合条件为水固比 0.25，成孔剂/水泥 0.3，反应釜内蒸养恒温温度为180 ℃，恒温时间为4 h。采用最优条件制备的多孔水泥石合成滤料进行污水除磷试验，考察了pH值、投加量及初始磷浓度对多孔水泥石合成滤料除磷的影响。结果发现，在实验条件下，滤料对浓度5～10 mg·L-1的含磷废水的去除率都在95.3%以上，最高达99.8%；废水浓度为50 mg·L-1，pH在中性条件下，每100 mL投加2.5 g滤料，磷去除率最高达89.6%。由吸附动力学过程分析可知，该滤料除磷吸附速率特性与准二级动力学模型拟合且吸附速率由颗粒内部扩散速率控制。 关键词：水泥石；除磷；吸附作用；合成滤料；动力学 中图分类号：X703 文献标志码：A 文章编号：1674-4764（2013）03-0115-06 Preparation of Porous Hardened Cement Paste Synthetic Filter Material and Phosphorus Removal from Wastewater by Adsorption Zheng Jun1，2， Yin Xing1， Liu Baohe1，3， Meng Guanhua1 （1. School of Civil Engineering and Architecture， Anhui University of Technology， Maan shan 243000， Anhui， P. R. China； 2. BAF Engineering Technology Research Center of Anhui Province， Maan shan 243051， Anhui， P. R. China； 3. School of Energy and Environment， Southeast University， Nanjing 210096， P. R. China） Abstract： Taking cement as primary raw material， a porous hardened cement paste synthetic filter material was prepared by steam curing in a reaction kettle. The optimum process combination condition of the filter material was determined. By orthogonal experiment， the optimal combinations of technical conditions were determined： water-solid ratio is 0.25， and pore-forming agent/cement equals to 0.3 with steaming temperature at 180°C in the reaction kettle for 4 h. Effects of pH value， dosing quantity and the initial concentration of phosphorus on phosphorus removal by using the filter materials which prepared under the optimal conditions were tested. The results show that the phosphorus removal rate reaches all above 95.3% and the highest one is 99.8% when the initial concentration of phosphorus is 5～10 mg·L-1. When the amount of filter material is added 2.5 g/100 mL， under the experimental condition of pH neutral， the top phosphorus removal rate reaches 89.6% when the concentration is 50 mg·L-1. The analysis of adsorption kinetic process shows that the pseudo-second-order