Možnosti využití kombinované metody laktát-nanoželezo pro sanace
Title Alternative:Possibilities of application lactate - nanoiron combined method for remediation
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Date
2009
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Publisher
Technická Univerzita v Liberci
Abstract
Cílem této bakalářské práce bylo ověření účinnosti kombinované metody laktát - nanoželezo na degradaci chlorovaných uhlovodíků a zejména posouzení vlivu konkurenčních reakcí nanoželeza s těžkými kovy a aniony (SO4, NO3, popř. Cl), které jsou přirozenou složkou přírodního prostředí. Testování probíhalo na kontaminované vodě z lokality Kuřívody, kde převažujícími kontaminanty jsou chlorované uhlovodíky.
The main aim of this bachelor thesis was to confirm the efficiency of combined method lactate-nano iron for degradation of chlorinated hydrocarbon and especially the assessment of influence competitive reactions of nanoiron with heavy metals and anions (SO4, NO3, eventually Cl), which are natural parts of the environment. The evaluation was done in contaminated water from the locality Kuřívody where the chlorinated hydrocarbons were the main contaminants. The lactic acid was dosed directly in the locality. In two intervals samples of water were taken. In laboratory there was applied zero-valent iron in two concentrations. Also for two month the reaction kinetics of nano iron with chlorinated hydrocarbon and natural particles of environment were monitored. During the experiment the efficiency of impact of the lactate and two concentrations of zero valence iron TODA to selected parameters - pH, ORP, CHSK and content PCE, TCE, 1,2 - cis - DCE, sulphates, nitrates, nitrites, chlorides and heavy metals, especially Pb was evaluated. Five month dosing interval is a sufficiently long period for lactate to be expend in the environment and to remove high-chlorinated ClU from contaminated water. The highest efficiency of combined method lactate-nano iron was proved in the case of longer interval from dosing of both reagents and higher dosing of Fe (3.0 g/l). The degradation efficiency of ClU was 66%. In the first phase of the experiment the Fe with lactate reaction was the most important, which was expressed with low differences during ClU and anions degradation among blind sample and samples with Fe. This was approved especially in dose 0.5 g/l Fe. According to their low initial concentration the assumed competitive reactions TK and anions with Fe (0) were low significant. They would not have an important influence on reagent consumption (zero-valent iron) for remediation of this locality.
The main aim of this bachelor thesis was to confirm the efficiency of combined method lactate-nano iron for degradation of chlorinated hydrocarbon and especially the assessment of influence competitive reactions of nanoiron with heavy metals and anions (SO4, NO3, eventually Cl), which are natural parts of the environment. The evaluation was done in contaminated water from the locality Kuřívody where the chlorinated hydrocarbons were the main contaminants. The lactic acid was dosed directly in the locality. In two intervals samples of water were taken. In laboratory there was applied zero-valent iron in two concentrations. Also for two month the reaction kinetics of nano iron with chlorinated hydrocarbon and natural particles of environment were monitored. During the experiment the efficiency of impact of the lactate and two concentrations of zero valence iron TODA to selected parameters - pH, ORP, CHSK and content PCE, TCE, 1,2 - cis - DCE, sulphates, nitrates, nitrites, chlorides and heavy metals, especially Pb was evaluated. Five month dosing interval is a sufficiently long period for lactate to be expend in the environment and to remove high-chlorinated ClU from contaminated water. The highest efficiency of combined method lactate-nano iron was proved in the case of longer interval from dosing of both reagents and higher dosing of Fe (3.0 g/l). The degradation efficiency of ClU was 66%. In the first phase of the experiment the Fe with lactate reaction was the most important, which was expressed with low differences during ClU and anions degradation among blind sample and samples with Fe. This was approved especially in dose 0.5 g/l Fe. According to their low initial concentration the assumed competitive reactions TK and anions with Fe (0) were low significant. They would not have an important influence on reagent consumption (zero-valent iron) for remediation of this locality.
Description
katedra: NTI; přílohy: 1 CD; rozsah: 62
Subject(s)
konkurenční reakce, laktát, nanoželezo, degradace, competitive reaction, lactate, zero-valent nanoiron, degradation