研究报告
刘平,秦晶,王超.赤泥强化型岸边缓冲带模拟系统对再生水中磷净化机理初探[J].环境科学学报,2011,31(1):94-101
赤泥强化型岸边缓冲带模拟系统对再生水中磷净化机理初探
- Mechanisms of phosphorus removal from reclaimed water in a simulated wetland buffer zone enhanced with red mud
- 基金项目：中国科学院支持天津滨海新区建设科技行动计划项目(No.TJZX1-YW-03);天津科技创新专项资金项目(No.06FZZDSH00900)
- 作者
- 单位
- 刘平
- 中国科学院生态环境研究中心, 北京 100085
- 秦晶
- 中国科学院生态环境研究中心, 北京 100085
- 王超
- 中国科学院生态环境研究中心, 北京 100085
- 摘要：为了探讨赤泥对再生水中磷的净化机理,利用烧结法得到了比表面积大、孔隙众多且均匀,钙、铁金属元素含量高,对磷具有较好的吸附作用的赤泥,并通过室内模拟河岸缓冲带系统研究了不同赤泥施入比例对再生水中磷的净化效果及机理.结果表明,赤泥投加量控制在2.5%～5.0%之间时,不仅对再生水中磷的去除效果最好,而且可促使系统基质中铁铝磷向稳定态的钙磷转化.赤泥的强碱性可使基质pH增加,当赤泥的施入比例为7.5%时,扫描电镜(SEM)和X射线能谱仪(EDS)联用的分析结果表明,基质表面有大量颗粒物质形成,这可能是导致再生水中磷去除率较低的原因,其颗粒物质的组分还需进一步分析.
- Abstract：Sintered red mud,with large specific surface area and many pores,is rich in Ca,Al and Fe oxides,which result in a good adsorption capacity for phosphorus. The performance and mechanisms of phosphorus removal from reclaimed water were investigated in a lab-scale simulated wetland buffer zone with different proportions of red mud added. The results indicated that the optimum of phosphorus removal was reached at the range of 2.5%～5.0% red mud,and thus the Al-P & Fe-Pin the substrate were transferred into the more stable state of Ca-P. However,the pHvalue of the substrate rose with the increased amount of red mud. At 7.5% red mud,the results of SEM/EDSshowed that many particle materials found on the surface of the substrate may lead to lower removal of phosphorus,though their composition needs further study.
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