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泥鳅在生物栅技术修复景观水体中的作用

DOI: 10.3724/SP.J.1145.2009.00082, PP. 82-86

Keywords: 生物栅,泥鳅,景观水体,生态修复

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Abstract:

设计一种由微生物载体填料和水生植物、水生动物为主要构件的生物栅处理装置(bgd),以强化处理污染景观水体.实验中选择组合填料、美人蕉、泥鳅作为生物栅构成要素,以上海市苏州河支流赤水河河水为实验用水,通过对比实验研究泥鳅在系统中的作用.泥鳅投放密度为650gm-2,以近自然的方式进行静态处理,过程中体系溶解氧(do)的变化范围为1.9~3.0mgl-1.bgd组do水平高于对照组,运行第24h和48h,bgd组do分别为1.96mgl-1和2.2mgl-1,而对照组只有1.5mgl-1.生物栅内泥鳅在根系和填料间往来穿梭,上下运动,增加了生物栅的复氧速率,bgd中ddo/ddoc[do减少量与溶解性有机碳(doc)减少量比值]随时间变化曲线斜率kbgd为?0.0042.?k对照<?kbgd,说明bgd中的复氧速率大于对照组.运行48h时bgd组nh4+-n和tp去除率分别为50.7%和82.4%,比对照组提高30.9%和23.5%.24h时bgd组tn去除率为34.4%,较对照组减少14.1.do水平相对较高有利于nh4+-n、tp的去除,而不利于tn的去除.对照组和bgd组对uv254类物质都有一定去除效果,但对照组的去除率低于bgd组,运行72h后,去除率分别为36.4%(对照组)和45.4%(bgd组),泥鳅分泌特定酶能够降解特定的有机物质,有利于uv254的去除.图6表3参17

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