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植物-浮床触生藻类对富营养化水体氮磷去除的协同效果

Keywords: 富营养化水体,植物,水芹,豆瓣菜,藻类

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Abstract:

利用植物浮床系统,通过室内静态模拟试验,研究了在有光、避光条件下,植物与浮床触生藻类协同作用对水体中氮、磷等营养盐的去除效果。结果表明,试验后水体中的藻类减少,但在浮床上的触生藻类增多,且其主要以小球藻(Chlorella.vulgaris)、小球衣藻(Chamydomonas.microsphaera)等绿藻为主。植物和无植物在有光条件下对TN、TP、CODMn、BOD5的去除率比在避光时要高,且植物处理的水体中的TN、TP去除率明显高于无植物(对照)处理。处理20d,植物在有光条件下对TN的去除率达76.8%以上,对TP的去除率在89.9%以上;而在遮光时对TN的去除率最高仅为61.1%,对TP的去除率最高为85.4%。植物在有光条件下对CODMn、BOD5的去除率达94.0%以上,而在遮光时对CODMn、BOD5的去除率最高为89.5%。有植物和无植物在有光、遮光条件下处理,水体中的NH4-N、NO3-N、NO2-N,DP,Chla的浓度均随处理时间的延长而降低,且有光处理下,NH4-N、NO2-N、DP浓度下降明显低于比在遮光下和对照处理。然而,DO浓度变化则相反,即随着处理时间的延长而升高,且在有光条件下的比在遮光下和对照处理要高。本试验结果还表明,遮光条件下,水芹和豆瓣菜地上部分N的净积累量分别为0.5908和0.

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