林金清,李超群,张玉生

• 1:华侨大学材料学院

摘要(Abstract)：

将填料层二氧化碳脱气柱合建在套管式磷回收装置的内套管上部,建立了一种新型的套管式空气脱气填料层鸟粪石法磷回收装置及其工艺,并详细研究了其脱气性能和磷回收效率。结果表明:该装置对废水中二氧化碳的脱除速度快、效果好,废水的pH值可从7.0迅速提升至8.0左右;废水中的氮磷对pH的提升都有抑制作用,磷的抑制作用尤为明显,但氮磷的存在对耗碱量的减少比例都没有影响,碱用量平均节省约20%;该工艺可提高磷回收率2%~5%,并可在较低的pH值-氮磷比和镁磷比的条件下实现磷回收,节省磷回收成本。研究结果还表明:磷回收率随pH值、磷初始浓度、氮磷和镁磷摩尔比的增大而升高,当后三个参数分别小于77.5 mg-L-1、2和1.2时,磷回收率随参数值的增大都迅速升高,但当这些参数大于其拐点值后,磷回收率继续升高的幅度都不大。

关键词(KeyWords)： 废水;磷回收;鸟粪石;装置;套管式;填料层;二氧化碳脱除

Abstract:

Keywords:

基金项目(Foundation): 福建省科技计划项目(2006HG028);; 厦门市科技计划项目(3502Z20093030)

作者(Author): 林金清,李超群,张玉生

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