摘要
考察了好氧颗粒污泥(AGS)对Pb2+的吸附及铵盐解吸附效果,为离子型稀土矿山尾水的治理提供技术支持。通过单因子实验研究了Pb2+浓度及吸附时间对吸附效果的影响,利用热力学模型及动力学模型研究了AGS对Pb2+的吸附能力及吸附速率,最后探索了0.1~2.0 mol/L氯化铵对AGS的解吸效果。当初始Pb2+浓度小于等于80 mg/L时,吸附率接近100%;前60 min吸附反应内,Pb2+浓度快速减小,但60 min后其减小趋势逐渐变缓。AGS(2690 mg/L)吸附Pb2+(20~1000 mg/L)过程符合Langmuir模型(R2=0.998,饱和吸附容量为55.37 mg/g)和伪二级动力学模型(R2=0.999)。AGS的首次吸附率接近100%,第5次时吸附率减小至38.2%;首次解吸附率为78.5%,第5次时的解吸率减小至39.9%。经过5次吸附-解吸附后AGS的颗粒化率仍在97%以上。结果表明AGS具有重复吸附Pb2+应用潜力。
The Pb2+adsorption by aerobic granular sludge(AGS) and the ammonium salt desorption are investigated, which aims to provide technical support for the treatment of wastewater from ionic rare earth mines.The influence of Pb2+concentration and adsorption time on the adsorption performance is explored by the single-factor experiment.Then, the Pb2+adsorption capacity and rate of AGS are studied by the thermodynamic model and kinetic model.Finally, ammonium chloride with a concentration of 0.1~2.0 mol/L is employed to desorb AGS.When the initial Pb2+concentration in wastewater is less than 80 mg/L,the adsorption efficiency is close to 100%.During the first 60 min of the adsorption, the concentration of Pb2+decreases rapidly, but the decreasing trend gradually slows down after the first 60 min.The Pb2+(20~1 000 mg/L) adsorption by AGS(2 690 mg/L) is in line with the Langmuir model(R~2 equals 0.998,and the saturated adsorption capacity is 55.37 mg/g) and the pseudo-second-order kinetic model(R~2= 0.999).The adsorption efficiency of AGS is close to 100% for the first time and decreases to 38.2% for the fifth time.The desorption efficiency is 78.5% for the first time and declines to 39.9% for the fifth time.After five rounds of adsorption and desorption, the granulation rate of AGS is still above 97%,which indicates that AGS has the potential for repeated adsorption of Pb2+.
作者
刘永
程媛媛
曾凌聪
张雨航
曾敏静
曾玉
李正昊
吴俊峰
龙焙
LIU Yong;CHENG Yuanyuan;ZENG Lingcong;ZHANG Yuhang;ZENG Minjing;ZENG Yu;LI Zhenghao;WU Junfeng;LONG Bei(School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Henan Key Laboratory of Water Pollution Control and Rehabilitation,Pingdingshan 467036,China)
出处
《人民珠江》
2023年第1期93-100,共8页
Pearl River
基金
国家自然科学基金资助项目(52060007)
江西省教育厅科技项目(GJJ190502)
江西理工大学研究生创新专项资金项目(XY2021-S024)
江西省大学生创新训练计划项目(S202110407051)
河南省水体污染防治与修复重点实验室开放基金(CJSP2021004)。
关键词
好氧颗粒污泥
铅离子
吸附
解吸附
铵盐
aerobic granular sludge
lead ions
adsorption
desorption
ammonium salt
