摘要
以河道底泥和粉煤灰为原料制备复合吸附剂,通过正交实验对吸附剂制备条件进行优化,并进一步研究了氨氮初始浓度、吸附剂投加量、初始pH及温度对复合吸附剂吸附氨氮效果的影响。结果表明,以氨氮比吸附量为衡量指标,吸附剂最佳制备条件为:河道底泥与粉煤灰原料配比7:2,烧结温度900℃,烧结时间20 min,添加剂类型为CaO。复合吸附剂对氨氮的吸附过程分三个阶段(快速吸附、缓慢吸附和吸附平衡),且吸附速率随氨氮初始浓度的升高而变大;复合吸附剂投加量的增大会提高氨氮去除率,但会导致比吸附量降低;复合吸附剂具有酸性缓冲能力,能创造有利于吸附过程的碱性环境;温度对复合吸附剂吸附过程的影响程度与氨氮初始浓度有关。
In this study,a composite adsorbent was prepared using river sediment and coal fly ash.The preparation conditions were optimized by orthogonal tests and the effects of different influential factors including the initial concentration of ammonia nitrogen,adsorbent dosage,initial pH and temperature on ammonia removal were investigated.The results showed that taking the specific adsorptive capacity for ammonia nitrogen as an indicator,the optimal preparation conditions for the composite adsorbent was achieved.The raw materials ratio of river sediment to coal fly ash was 7:2.The sintering temperature was 900℃.The sintering time was 20 min and the type of addition agent was CaO.Three stages(rapid adsorption,slow adsorption and adsorption equilibrium)were observed during the ammonia nitrogen adsorption by the composite adsorbent.The adsorption rate was increased with the increase of initial ammonia concentration.With the increase of composite adsorbent dosage,the removal efficiency of ammonia nitrogen was enhanced,but the specific adsorptive capacity was decreased.The composite adsorbent has an acid buffering capacity,creating an alkaline environment,which was beneficial for adsorption.The effects of temperature on the adsorption process of composite adsorbents were related to the initial concentration of ammonia nitrogen.
作者
王迪迪
尹志轩
乔春蕾
何德明
刘长青
WANG Didi;YIN Zhixuan;QIAO Chunlei;HE Deming;LIU Changqing(Qingdao University of Technology,School of Environmental and Municipal Engineering,Qingdao 266033,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2022年第7期83-87,97,共6页
Technology of Water Treatment
基金
山东省重大科技创新工程项目“底泥重金属污染治理关键技术与工程示范”(2018YFJH0902)
青岛理工大学环境科学与工程一流学科开放课题(QUTSEME201929)。
关键词
复合吸附剂
河道底泥
粉煤灰
制备条件
吸附性能
composite adsorbent
river sediment
coal fly ash
preparation conditions
adsorption performance
