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鋸末-零價鐵混合PRB去除地下水中硝酸鹽研究
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國家自然科學基金資助項目（41101288）


Nitrate Removal from Groundwater Using Permeable Reactive Barrier Amended with Sawdust and Zero-valent Iron
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    摘要:

    以鋸末,、零價鐵、活性碳為反應介質，研究填裝方式,、接種量,、停留時間等對可滲透反應墻去除硝酸鹽的影響,。結果表明：鋸末和零價鐵混合填裝PRB中硝酸鹽的去除率達到99.39%,，高于兩者分層填裝的PRB,；增加反應時間可以提高硝酸鹽的去除率,，但會增加出水的可溶性有機碳,；在一定范圍內(nèi)增加接種量可以提高硝酸鹽的去除率；硝酸鹽的去除率,、出水可溶性有機碳和菌落數(shù)隨硝酸鹽初始濃度的升高而降低,，但銨態(tài)氮的積累有所升高；活性炭不僅可以促進硝酸鹽的去除,、降低體系中銨態(tài)氮積累,，還可以改善出水色度。鋸末和零價鐵混合填裝PRB的出水檢測不到亞硝態(tài)氮,，分層填裝PRB的出水檢測到亞硝態(tài)氮質量濃度最低為0.764 mg/L,，最高為1.285 mg/L；此外,，各PRB中的出水菌落數(shù)在103~106 CFU/mL之間變化,。

    Abstract:

    To investigate the effects of different packing modes, inoculation quantites and hydraulic retention time on nitrate removal, permeable reactive barriers (PRBs) packed with sawdust, zero-valent iron (Fe0) and active carbon were tested in laboratory. The PRB filled with completely mixed sawdust and Fe0 showed higher nitrate removal efficiencies than those filled with sawdust and Fe0 in layer modes. Nitrate removal efficiencies and dissolved organic carbon (DOC) in effluent increased with hydraulic retention time increased. Within limits, increasing the amount of inoculum quantity of PRB could increase nitrate removal rate. Nitrate removal efficiency, DOC concentration and the number of bacterial colonies in effluent decreased with the initial nitrate concentration increasing, whereas the accumulation of ammonium showed an opposite trend. Addition of active carbon not only could promote the reduction of nitrate, decrease ammonium concentration but also could improve outlet water chroma. Furthermore, the nitrite could be nearly detected in the effluent, while the number of bacrteria colonies changed from 103 CFU/mL to 106 CFU/mL. 

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王珍,張增強,李榮華,肖然.鋸末-零價鐵混合PRB去除地下水中硝酸鹽研究[J].農(nóng)業(yè)機械學報,2013,44(8):112-117. Wang Zhen, Zhang Zengqiang, Li Ronghua, Xiao Ran. Nitrate Removal from Groundwater Using Permeable Reactive Barrier Amended with Sawdust and Zero-valent Iron[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(8):112-117.

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  • 在線發(fā)布日期: 2013-07-19
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