摘要
酸性老窑水给当地关键带的水资源及生态环境带来潜在风险。因此,研究治理闭坑矿区的酸性老窑水已是迫在眉睫。以马兰黄土为吸附剂,通过吸附实验研究了黄土剂量、吸附时间等因素对酸性老窑水中典型污染物(SO4^2-、Fe、Mn、Zn)的吸附特性。结果表明:黄土可以有效吸附酸性老窑水中典型污染物。随着黄土剂量和吸附时间增加,SO4^2-、Fe、Mn和Zn的去除率增加,且由于存在竞争性吸附,导致黄土对污染物去除率不一致。黄土对酸性老窑水典型污染物的吸附更符合准二级动力学模型。同时对吸附饱和的黄土进行碱再生,表明再生黄土首次对污染物也有较好的处理效果。此外,利用扫描电子显微镜(SEM)和X射线衍射(XRD)研究分析了黄土的吸附前后特性,表明马兰黄土对其吸附以化学吸附为主,伴随物理吸附。
Acid mine drainage(AMD)affected the regional water resources and ecological environment,and bring potential risk to the earth critical zone.Therefore,it is imminent to research rehabilitation of AMD.The adsorption performances and mechanisms of SO4^2-、Fe、Mn and Zn adsorbed on Malan loess(Q3)were evaluated using batch adsorption experiments.The effects of the dosage and contact time on SO4^2-、Fe、Mn and Zn adsorption in acid mine drainage(AMD)were studied.The results indicated that SO4^2-、Fe、Mn and Zn removal rate in loess increased with increasing dosage and contact time.Due to competitive adsorption,the removal rates are difference.The optimal dosage was 4 g/40 mL.The adsorption kinetics of SO4^2-、Fe、Mn and Zn onto loess were most accurately described by the pseudo-second-order model.The alkaline regeneration of the loess showed that the regenerated loess also had a good treatment effect on SO4^2-,Fe,Mn and Zn in the first cycle.Scanning electron microscope(SEM)and X-ray diffraction(XRD)analysis with or without SO4^2-,Fe,Mn and Zn adsorption demonstrated that calcite of loess played a key role during adsorption.These results suggested that Malan loess is an applicable adsorbent for sulfate pollution.
作者
郑强
张永波
吴艾静
时红
常诚
ZHENG Qiang;ZHANG Yong-bo;WU Ai-jing;SHI Hong;CHANG Cheng(College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《科学技术与工程》
北大核心
2020年第3期1277-1282,共6页
Science Technology and Engineering
基金
科技部重点研发计划(2018YFC0406403)。
关键词
马兰黄土
酸性老窑水
吸附
再生
Malan loess
acid mine drainage
adsorption
regeneration
