新型污泥基吸附材料制备及其氨氮去除性能评价  

Preparation and NH_4^+-N Removal Performance of a Novel Filter Substrate Made from Sludges

作　　者：王文东[1,2] 刘荟[1] 张银婷[1] 杨生炯[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]浙江清华长三角研究院生态环境研究所,嘉兴314006

出　　处：《环境科学》2016年第8期3186-3191,共6页Environmental Science

基　　金：国家自然科学基金项目(21007050);教育部博士点基金项目(20106120120014);陕西省自然科学基金项目(09JS029)

摘　　要：采用高温焙烧法制备了一种以给水厂终端铝盐混凝污泥为原料的新型吸附剂.通过静态吸附实验探讨其对氨氮的吸附性能,实验中主要考察了不同初始p H、接触时间和温度等因素对氨氮吸附效果的影响,同时分析了吸附剂对氨氮的吸附等温线,动力学和热力学特性.结果表明,在中性条件下吸附剂对氨氮有较好的去除效果;吸附过程在6 h基本达到平衡,吸附过程符合准二级动力学模型,Langmuir吸附模型可较好地拟合吸附剂对氨氮的吸附;热力学参数表明陶粒吸附剂对NH_4^+-N的吸附过程是自发的、吸热反应(ΔG~θ<0、ΔH~θ>0),且由平均吸附能得到该吸附属于物理吸附.因此,混凝污泥处理氨氮废水具有良好的应用前景.A novel absorbent was prepared by high-temperature calcination using waterworks terminal aluminum coagulation sludge as a raw material. This study discussed ammonia nitrogen adsorption performance of the adsorbent by static adsorption test,mainly investigated the influences of different initial p H,contact time and temperatures on the ammonia adsorption effect,and also analyzed the adsorption isotherms,kinetic and thermodynamic properties of adsorbent on the ammonia nitrogen. Experimental results showed that the adsorbent had a better effect for ammonia removal under neutral conditions; the adsorption process was basically balanced within 6h,and it followed the pseudo second-order model. Langmuir adsorption model could be better fitted for the adsorption of ammonia adsorbent; the thermodynamic parameters indicated that the adsorption process of ceramic adsorbents on NH_4~＋-N was a kind of spontaneous,endothermic reaction（ ΔG~θ〈 0,ΔH~θ〉 0）,and it was found to be a physical adsorption based on the average adsorption energy. Thus,treating ammonia wastewater by coagulation sludge has a good prospect.

关 键 词：混凝污泥 吸附 氨氮 拟二级反应动力学 高温焙烧 

分 类 号：X131[环境科学与工程—环境科学] X703.1