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首页> 外文会议>International Conference on Wetlands amp; Remediation Salt Lake City, Utah, November 16-17, 1999 >Removal of tnt using plants in constructed wetlands
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Removal of tnt using plants in constructed wetlands

机译：使用人工湿地中的植物清除tnt

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The TNT degradation study was conducted using three typical wetlands plant litter types (straw, cattail, and bulrush) in hydroponic solution. TNT (220 #mu#M) was rapidly and completely removed with all plants (10 g/L) within three to five days at 20 deg C. The first order rate constant of TNT disapperance using straw litter was 0.59 day~(-1) at 20 deg C, and similar rates were observed with bulrush and cattail ranging from 0.56 to 1.33 day~(-1). TNT removal first resulted in an initial increase of 4-amonodinitrotoluene (4-ADNT). The concentration of 4-ADNT also decreased and was below detectable limits after further incubation. Disapperarance of 4-ADNT could have been due to further reduction to 2,4-diamino-6-nitrotoluene (2,4-DANT). The same patterns of metabolites formation and degradation were observed with other bulrush, and cattail carbon sources. A significant difference in TNT degradation rates (0.12 day~(-1) at 10 deg C) was observed with 10 deg C difference. The maximum combined level of metabolites concentration was only 10 to 18 percent of the initial TNT. From extraction study, we found the trace amounts of 4-ANDT and 2,4-DANAT, but no TNT was detected. The ~(14)C study and sorption experiment also showed that TNT mineralization did not take place, and the TNT disappearance have been the result of a combination of two processes; initial sorption followed by bacterial degradation. A mesocsm scale constructed wetlands for treating TNT is now underway at the Richmond Field Station (Richmond, CA).
机译：在水培溶液中使用三种典型的湿地植物凋落物类型（稻草，香蒲和芦苇）进行了TNT降解研究。在20℃下三到五天内，所有植物（10 g / L）均快速，完全地去除了TNT（220＃mu＃M）。使用秸秆凋落物进行TNT分解的一阶速率常数为0.59天〜（-1 ）在20℃时，芦苇和香蒲的观测速率相似，为0.56至1.33天〜（-1）。 TNT的去除首先导致4-氨基二硝基甲苯（4-ADNT）的初始增加。进一步孵育后，4-ADNT的浓度也降低并且低于可检测的极限。 4-ADNT的失配可能是由于进一步还原为2,4-二氨基-6-硝基甲苯（2,4-DANT）。在其他芦苇和香蒲碳源中观察到了相同的代谢物形成和降解模式。观察到TNT降解速率的显着差异（在10℃下为0.12天〜（-1）），差异为10℃。代谢物浓度的最大合并水平仅为初始TNT的10％至18％。从提取研究中，我们发现了痕量的4-ANDT和2,4-DANAT，但未检测到TNT。 〜（14）C研究和吸附实验还表明，TNT没有发生矿化作用，并且TNT的消失是两个过程结合的结果。初始吸附，然后细菌降解。里士满野外站（加利福尼亚州里士满）正在建设一个中尺度规模的湿地来处理TNT。

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