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    Biological Clogging in Storm Water Filters

    Source: Journal of Environmental Engineering:;2015:;Volume ( 141 ):;issue: 002
    Author:
    H. S. Kandra
    ,
    J. Callaghan
    ,
    A. Deletic
    ,
    D. T. McCarthy
    DOI: 10.1061/(ASCE)EE.1943-7870.0000853
    Publisher: American Society of Civil Engineers
    Abstract: Biological clogging of filtration and infiltration systems has been acknowledged as a significant problem in the case of wastewater systems. However, scant research has been conducted on biological clogging in storm water filtration and infiltration systems, with the main hypothesis being that biological clogging is insignificant due to the low level of organics present in storm water. This article tested that hypothesis, using a laboratory-based approach. Five replicates of each zeolite-based filter design were dosed with storm water manifesting the following forms: (1) typical storm water (base case); (2) storm water containing very high nutrient concentrations to accelerate biological clogging; (3) typical storm water that was sterilized to suppress biological clogging; and (4) typical storm water with the addition of chlorine to suppress biological activity. The hydraulic performances of these four configurations were monitored over time until the systems were fully clogged. Loss on ignition (LoI) and microscopic analysis of accumulated material within the top layers of the filters were undertaken in an attempt to assess the level of organic matter present in clogging layers of the filters. It was found that all configurations performed differently in comparison to the base case, which represents the most likely set of operational conditions in the field. For instance, the chlorinated filters treated about 30% more storm water compared with the base case. Columns dosed with sterilized storm water treated almost the same volume of storm water but removed a greater quantity of sediment with higher treatment efficiency. Columns dosed with a high level of nutrients clogged more quickly than in the base case. Results of loss on ignition partially confirmed these findings. However, results of microbial cell counts provided tenuous evidence of biological clogging being present. Although the evidence was not overpowering, the variations observed in this study suggest that biological clogging in storm water filters warrants greater attention, which is mostly ignored at present.
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      Biological Clogging in Storm Water Filters

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    http://yetl.yabesh.ir/yetl1/handle/yetl/74257
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    • Journal of Environmental Engineering

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    contributor authorH. S. Kandra
    contributor authorJ. Callaghan
    contributor authorA. Deletic
    contributor authorD. T. McCarthy
    date accessioned2017-05-08T22:13:34Z
    date available2017-05-08T22:13:34Z
    date copyrightFebruary 2015
    date issued2015
    identifier other39904656.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/74257
    description abstractBiological clogging of filtration and infiltration systems has been acknowledged as a significant problem in the case of wastewater systems. However, scant research has been conducted on biological clogging in storm water filtration and infiltration systems, with the main hypothesis being that biological clogging is insignificant due to the low level of organics present in storm water. This article tested that hypothesis, using a laboratory-based approach. Five replicates of each zeolite-based filter design were dosed with storm water manifesting the following forms: (1) typical storm water (base case); (2) storm water containing very high nutrient concentrations to accelerate biological clogging; (3) typical storm water that was sterilized to suppress biological clogging; and (4) typical storm water with the addition of chlorine to suppress biological activity. The hydraulic performances of these four configurations were monitored over time until the systems were fully clogged. Loss on ignition (LoI) and microscopic analysis of accumulated material within the top layers of the filters were undertaken in an attempt to assess the level of organic matter present in clogging layers of the filters. It was found that all configurations performed differently in comparison to the base case, which represents the most likely set of operational conditions in the field. For instance, the chlorinated filters treated about 30% more storm water compared with the base case. Columns dosed with sterilized storm water treated almost the same volume of storm water but removed a greater quantity of sediment with higher treatment efficiency. Columns dosed with a high level of nutrients clogged more quickly than in the base case. Results of loss on ignition partially confirmed these findings. However, results of microbial cell counts provided tenuous evidence of biological clogging being present. Although the evidence was not overpowering, the variations observed in this study suggest that biological clogging in storm water filters warrants greater attention, which is mostly ignored at present.
    publisherAmerican Society of Civil Engineers
    titleBiological Clogging in Storm Water Filters
    typeJournal Paper
    journal volume141
    journal issue2
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/(ASCE)EE.1943-7870.0000853
    treeJournal of Environmental Engineering:;2015:;Volume ( 141 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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