分段进水对人工快渗系统脱氮效率的影响
Impact of step-feed mode on removal of nitrogen in a constructed rapid infiltration system
查看参考文献18篇
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文摘
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为提高人工快速渗滤系统(CRI)的处理效率,研究了分段进水方式下以河砂/钢渣(1~#)和河砂/天然沸石(2~#)为填料的两个快渗池中氮的垂直分布规律,以及对氨氮、硝酸盐氮、亚硝酸盐氮及总氮四种形态的氮和COD_(Mn)的去除效果。结果表明,1~#池、2~#池采用2∶1的进水比例在表层下600 mm处分段进水对总氮的平均去除率分别为50.90%和45.93%,相对常规进水1~#、2~#池总氮去除率分别提高12.45%和12.23%,但对氨氮及COD_(Mn)的去除率影响较小;1~#池、2~#池采用1∶1的进水比例在表层下1000 mm处分段进水对总氮的平均去除率分别为47.80%和36.21%,相对常规进水1~#、2~#池总氮去除率分别提高9.35%和2.51%,但是对氨氮及COD_(Mn)的去除率大幅下降。CRI系统中不同形态氮、DO及ORP垂直分布特征显示表层为好氧环境,有利于有机物的分解及硝化作用,底层为缺氧环境,有利于反硝化作用的顺利进行。此外,相对于天然沸石而言钢渣对污染物具有更好的去污效果。本研究表明,选取适当的分段进水位置及进水比例是提高CRI系统对氮的去除率的有效途径。 |
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其他语种文摘
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In order to improve the removal performance of constructed rapid infiltration (CRI) system, two CRI systems were operated with bank sand/steel slag (system 1) or bank sand/zeolite (system 2) as media material, respectively, and the effect of step-feed position and step-feed ratio on the removal efficiencies of nitrogen and COD_(Mn) as well as the vertical distribution patterns of nitrogen in them were investigated. The results showed that when the step-feed ratio was 2∶1 and step-feed position was at a depth of 600 mm below the surface, the TN removal efficiencies of system 1 and system 2 reached 50.90% and 45.93%, respectively, increasing by 12.45% and 12.23% compared with the normal flooding pattern, whereas no significant effect was observed for NH_3-N and COD_(Mn) removal. The TN removal efficiencies of system 1 and system 2 were 47.80% and 36.21%, respectively, increasing only by 9.35% and 2.51% when the step-feed ratio was 1∶1 and the step-feed position was at 1 000 mm depth, and the removal efficiencies of NH_3-N and COD_(Mn) decreased dramatically. The vertical distribution patterns of different forms of nitrogen, DO and ORP (oxidation-reduction potential) in CRI system suggested that the aerobic conditions in the upper layer favored nitrification and organic matter degradation, while the anoxic conditions in the bottom layer enhanced denitrification. Furthermore, the addition of steel slag was more efficient than zeolite in removing pollutants. These results implied that an improved nitrogen removal can be achieved through optimizing step-feed position and step-feed ratio in the CRI system. |
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来源
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环境工程学报
,2012,6(11):3999-4005 【核心库】
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关键词
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快速渗滤
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分段进水
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脱氮
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溶解氧
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地址
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1.
武汉理工大学资源与环境工程学院, 武汉, 430070
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中国科学院水生生物研究所, 武汉, 430072
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语种
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中文 |
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ISSN
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1673-9108 |
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学科
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行业污染、废物处理与综合利用 |
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基金
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国家重大科技专项
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广东新高地建设专项工程资助
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文献收藏号
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CSCD:4680762
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