摘要
采用内蒙古某地产膨润土处理氨氮模拟废水,在废水体积为100 mL,膨润土用量为5 g的条件下,利用静态吸附试验考察了吸附时间、溶液pH值、溶液中Ca2+,Mg2+浓度及氨氮初始浓度对氨氮去除率的影响,并采用改性液对膨润土进行了盐改性。结果表明,最佳吸附时间为60 min,溶液pH值为7.92,此时氨氮去除率最大,为63.38%;随着Ca2+,Mg2+浓度的增大,氨氮去除率降低,且Mg2+比Ca2+的影响程度大;当氨氮初始浓度为0～200 mg/L时,Langmuir等温线的相关系数达0.996 2;在改性液质量分数为4%时,盐改性膨润土的氨氮去除率最高,为90.18%。
The ammonia nitrogen simulated wastewater were treated by bentonite obtained from Nei Monggol. Under the conditions of the wastewater volume of 100 mL and bentonite of 5 g,the effect of adsorption time, solution pH value, concentration of Ca2＋ and Mg2＋ and initial concentration of ammonia nitrogen on the removal rate of ammonia nitrogen were investigated through a static adsorption test, and the bentonite was modified by sodium chloride solution. The results showed that the optimum adsorption time was 60 min, the solution pH value 7.92, and under those conditions, the removal rate of ammonia nitrogen was maximum （63. 38% ）. With the increase of Ca2＋ , Mg2＋ concentration,the ammonia nitrogen removal rate decreased, and Mg2＋ had more influences than Ca2＋ . When the initial concentration of ammonia nitrogen ranged over 0 -200 mg/ L, the correlation coefficient of Langmuir isotherm was 0. 9962. When the bentonite was modified by sodium chloride solution of concentration of 4% , the ammonia nitrogen removal rate was up to 90.18%.
出处
《石化技术与应用》
CAS
2011年第2期172-175,共4页
Petrochemical Technology & Application
关键词
膨润土
氨氮废水
吸附
改性膨润土
氨氮去除率
等温吸附线
bentonite
ammonia nitrogen waste water
adsorption
modified bentonite
ammonia nitrogen removal rate
adsorption isothermal
