离子交换树脂对高浓度氨氮废水的吸附研究  

Removal of high concentration ammonia from wastewater by ion exchange resins

作　　者：罗圣熙 杨春平[1,2,3] 龙智勇[2,3,5] 罗肃霜 吕黎[1] 何闪英[1] 

机构地区：[1]浙江省固体废物处理与资源化重点实验室,浙江工商大学环境科学与工程学院,杭州310018 [2]湖南大学环境科学与工程学院,长沙410082 [3]环境生物与控制教育部重点实验室(湖南大学),长沙410082 [4]湖南省建筑设计院,长沙410082 [5]中国城市建设研究院,北京100120

出　　处：《环境科学学报》2015年第8期2457-2463,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.51278464,51478172)~~

摘　　要：采用D707、D708两种不同类型的离子交换树脂对高浓度氨氮废水进行吸附处理研究,分析了不同的吸附条件及等温吸附模型对吸附效果的影响.静态吸附实验表明:NH+4的吸附率随树脂投加量的增大而增加,在非碱性条件下树脂对NH+4的吸附率随p H的升高而增加;恒速振荡时间达到90 min以上时两种树脂可吸附平衡,当p H为7时,D707、D708树脂对NH+4的吸附容量分别达到196.1、217.4 mg·g-1;D707、D708树脂对NH+4的吸附属吸热过程,随温度的升高树脂对NH+4的吸附率逐渐增大,在298 K温度下D707、D708树脂吸附NH+4的表观吸附活化能Ea分别为54.67和34.46 k J·mol-1,吸附过程为液膜扩散主控制;树脂对NH+4吸附符合Langmuir吸附等温式;使用2 mol·L-1H2SO4对树脂进行解吸,脱附率达到98%以上,重复实验3次吸附率基本不变.Two different types of resins,D707 and D708,were selected for the treatment of wastewater with high-concentration ammonia from vanadium smelting. Static adsorption experiments showed that the adsorption removal rates increased with the increasing dosage of the resins. In acidic condition,the adsorption removal rate increased with the increase of the p H value. The adsorption reached equilibrium at a mixing time of 90 min. At p H value of7,adsorption capacities of D707 and D708 achieved 196. 1 and 217. 4 mg·g^- 1,respectively. Data of the adsorption by the resins showed the adsorption was endothermic. At 298 K,the activation energy for the adsorption of NH＋4by D707 and D708 were 54. 67 and 34. 46 k J·mol^-1,respectively. Liquid film diffusion was the rate-control process for the adsorption. Experimental data correlated well with the Langmuir adsorption isotherm. When 2 mol·L^-1H2SO4 was used for desorption of D707 and D708 resins,desorption removal rates for both resins exceeded 98%. The adsorption rate remained unchanged after three repeated adsorption cycles.

关 键 词：离子交换树脂 静态吸附 吸附容量 等温吸附 脱附 

分 类 号：X703.1[环境科学与工程—环境工程]