改性矿化垃圾对渗滤液生化出水中COD和氨氮的吸附  

Adsorption of COD and ammonia nitrogen in leachate from biochemical process on modified aged refuse adsorbent

作　　者：聂发辉[1] 刘荣荣[1] 李文婷[1] 刘占孟[1] 

机构地区：[1]华东交通大学土木建筑学院,南昌330013

出　　处：《环境工程学报》2016年第6期2786-2792,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51168013);国家科技支撑项目(2014BAC04B03)

摘　　要：用矿化垃圾作为吸附剂吸附处理生化后的垃圾渗滤液,利用单因素变量法研究了改性温度、p H、吸附剂投加量和反应时间对吸附效果的影响,并采用红外光谱和电镜扫描对矿化垃圾进行表征。结果表明:矿化垃圾改性温度为700℃,水样p H值为9,吸附剂用量为60 g/L,反应时间为10 h时,COD和氨氮去除率分别达到58.38%和79.77%,平衡吸附量分别为11.68 mg/g和1.58 mg/g;动力学数据拟合COD和氨氮吸附过程均符合拟二级动力学方程即吸附速率被化学吸附所控制;等温方程拟合表明,矿化垃圾对COD和氨氮的吸附分别属于多层吸附和单层吸附;红外光谱分析结果显示,吸附过程中OH、C=O和C—O 3种基团起主要作用;电镜扫描结果显示,矿化垃圾改性前、后和吸附前、后内部结构均发生变化。In the biological treatment of leachate using aged refuse as the adsorbent,the effects of modifying the temperature,p H,adsorbent dosage,and reaction time on biosorption capacity were studied using the univariate variable method. Moreover,the adsorption mechanism was studied by infrared spectroscopy and scanning electron microscopy. Using aged refuse under the conditions of 700 ℃,p H 9,aged refuse dosage of 60 g /L,and reaction time of 10 h,the COD and ammonia nitrogen removal rates reached 58. 38% and 79. 77%,and the equilibrium adsorption capacity were 11. 68 mg / g and 1. 58 mg / g. The fitting of dynamics data from the COD and ammonia nitrogen adsorption processes was in line with the quasi-second order equation,which indicated that the rate of adsorption was dependent on chemical adsorption. The fitting of the isotherm equation showed that the adsorption of COD and ammonia nitrogen onto aged refuse can be classified as multilayer adsorption and monolayer adsorption,respectively. IR micrographs of the aged refuse obtained before and after adsorption of COD and ammonia nitrogen indicate that the aged refuse was mainly composed of OH,C=O and C—O,and the main mechanism for adsorption of COD and ammonia nitrogen was surface complexation. The scanning electron microscopy results showed that the aged refuse before and after the modification,and internal structures of before and after adsorption,were changed.

关 键 词：矿化垃圾 垃圾渗滤液 吸附动力学 吸附等温线 红外光谱 电镜扫描 

分 类 号：X703[环境科学与工程—环境工程]