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引用本文:林建伟,朱志良,赵建夫,詹艳慧.无机盐改性对沸石覆盖技术控制底泥氮磷释放的影响研究.湖泊科学,2007,19(1):52-57. DOI:10.18307/2007.0108
LIN Jianwei,ZHU Zhiliang,ZHAO Jianfu,ZHAN Yanhui.Effect of inorganic salt modification on zeolite barriers to control phosphorus and nitrogen release from sediments. J. Lake Sci.2007,19(1):52-57. DOI:10.18307/2007.0108
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无机盐改性对沸石覆盖技术控制底泥氮磷释放的影响研究
林建伟1, 朱志良1, 赵建夫1, 詹艳慧2
1.同济大学环境科学与工程学院, 上海200092;2.重庆大学资源及环境科学学院, 重庆400044
摘要:
通过试验, 考察了无机盐改性对沸石覆盖控制底泥氮磷释放效果的影响, 并对沸石覆盖技术控制底泥氮磷释放的机理进行初步探讨, 结果表明:①NaCl及CaCl2改性对沸石吸附氨氮的性能影响不大;CaCl2改性可以提高沸石Ca2+的交换量而降低Na+的交换量, NaCl改性则可以明显降低Ca2+的交换量和增加Na+的交换量.②NaCl及CaCl2改性对沸石覆盖技术控制底泥氨氮的释放影响不大, 而对控制底泥磷的释放则影响较大, 沸石覆盖控制底泥磷释放效率从大到小依次为CaCl2改性沸石>天然沸石>NaCl改性沸石.③沸石覆盖技术控制底泥氨氮释放的机理为沸石的物理吸附和阳离子交换作用, 控制底泥磷释放的机理包括沸石的机械阻挡作用和沸石与铵所交换出来的Ca2+对磷酸盐的固定作用.
关键词:  沸石  覆盖  底泥  氮磷  无机盐改性
DOI:10.18307/2007.0108
分类号:
基金项目:科技部小城镇科技发展重大项目(2003BA808A17);国家自然科学基金项目(50478103)联合资助.
Effect of inorganic salt modification on zeolite barriers to control phosphorus and nitrogen release from sediments
LIN Jianwei1, ZHU Zhiliang1, ZHAO Jianfu1, ZHAN Yanhui2
1.School of Environmental Science & Engineering, Tongji University, Shanghai 200092, P.R.China;2.School of Resource & Environmental Science, Chongqing University, Chongqing 400044, P.R.China
Abstract:
Effect of inorganic salt modification on efficiency of zeolite barrier to control phosphorus and nitrogen release from sediments was analyzed.The results show that :( 1) Sorption of ammonium on zeolite was influenced less by modification of NaCl or CaCl2.However, in comparison to natural zeolite, NaCl modification zeolite will release more Na^+ and less Ca2+, and CaCl2 modification zeolite will release less Na+ and more Ca2+.(2) The efficiency of zeolite barrier to control ammonia release will be influenced little by modification of NaCl or CaCl2.However, the efficiency of zeolite barrier to control phosphorus release will be greatly affected by modification of NaCl or CaCl2, and in order of CaCl2 modification zeolite > natural zeolite > NaCl modification zeolite.(3) The mechanics of zeolite barrier for controlling ammonia release is physical sorption and ion exchange, and zeolite barrier reduces phosphorus release rate depends on its trapping and immobilization of Ca2+ that was released from zeolite.
Key words:  Barrier  Zeolite  sediments  phosphorus and nitrogen  inorganic salt modification
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