Využití Fentonova činidla pro sanaci podzemních vod na lokalitě Farmak Olomouc
Title Alternative:Fenton reagent utilization for groundwater remediation at Farmak Olomouc site
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Date
2009
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Publisher
Technická Univerzita v Liberci
Abstract
Diplomová práce se zabývá in - situ chemickou oxidací (ISCO), jejími klady a zápory, srovnáním všech oxidačních činidel, jmenovitě manganistanu, persulfátu, peroxidu vodíku, katalyzovaného peroxidu vodíku a jeho modifikace. Detailněji se práce zaměřuje na Fentonovo činidlo a jeho modifikace. Je zde vysvětlen chemismus oxidace za pomoci Fentonova činidla a vlivy na proces oxidace, jako je poměr katalyzátorů ku peroxidu vodíku, typ použitého železa (Fe2+, Fe3+), role chelatačních činidel při stabilizaci peroxidu vodíku v horninovém prostředí a role scavengerů hydroxylových radikálů. Jelikož při Fentonově oxidaci může dojít k negativní mobilizaci těžkých kovů, je jim v práce věnována samostatná kapitola. Experimentální část práce popisuje realizované laboratorní testy, kde byl zkoumán poměr Fe2+ a citrátu, jeho vliv na pH a teplotu, těkavost kontaminantů a test oxidace lehké ropné fáze (LNAPL). V další rozsáhlejší kapitole je popis pilotního testu Fentonova činidla, realizovaného na lokalitě Farmak Olomouc.. Na lokalitě probíhal detailní monitoring těžkých kovů, těkavých organických látek a vzdušniny v průběhu pilotního testu. V závěru práce jsou vyhodnoceny výsledky všech testů a na jejich základě jsou formulovány jak obecnější poznatky tak praktická doporučení pro další sanaci lokality.
This graduation thesis discuss about in - situ chemical oxidation, of its positives and negatives, basic comparision of all oxidation reagents, namely permanganate, persulfate, ozone, hydrogen peroxide, catalyzed hydrogen peroxide and his modification. The main topic of the work is Fenton´s reagent. Basic principles and all influencing factors are described. It means first of all the relationship between H2O2 and Fe2+, pH, T, different types of iron Fe2+, chelating agents, ways of stabilization of hydrogen peroxide in the subsurface and the role of scavengers of hydroxyl radicals. There is usually mobilisation of heavy metals playing a negative role during Fenton reagent aplications. That is why there is a special emphasis on this topic in this work. Experimental part of this work was done in laboratory Artec at the Technical university of Liberec. It describes the laboratory tests studying the ratio between Fe2+ and citric acid and its effects on pH and temperature, volatilization of contaminants during chemical oxidation process and the oxidation process in presence of LNAPL. The last chapter describes the pilot scale at site Farmak Olomouc with the use of Fenton reagent. The site is very specific because there is a mixture of contaminants, namely chlorobenzene, toluene, chlorinated hydrocarbons, cresols and locally methanol. During the pilot scale there was conducted a detailed monitoring of physical-chemical parameters, heavy metals, volatile organic compounds in groundwater and of the composition of soil vapor. In the summary of the work, results are discussed and following consequencies are expressed.
This graduation thesis discuss about in - situ chemical oxidation, of its positives and negatives, basic comparision of all oxidation reagents, namely permanganate, persulfate, ozone, hydrogen peroxide, catalyzed hydrogen peroxide and his modification. The main topic of the work is Fenton´s reagent. Basic principles and all influencing factors are described. It means first of all the relationship between H2O2 and Fe2+, pH, T, different types of iron Fe2+, chelating agents, ways of stabilization of hydrogen peroxide in the subsurface and the role of scavengers of hydroxyl radicals. There is usually mobilisation of heavy metals playing a negative role during Fenton reagent aplications. That is why there is a special emphasis on this topic in this work. Experimental part of this work was done in laboratory Artec at the Technical university of Liberec. It describes the laboratory tests studying the ratio between Fe2+ and citric acid and its effects on pH and temperature, volatilization of contaminants during chemical oxidation process and the oxidation process in presence of LNAPL. The last chapter describes the pilot scale at site Farmak Olomouc with the use of Fenton reagent. The site is very specific because there is a mixture of contaminants, namely chlorobenzene, toluene, chlorinated hydrocarbons, cresols and locally methanol. During the pilot scale there was conducted a detailed monitoring of physical-chemical parameters, heavy metals, volatile organic compounds in groundwater and of the composition of soil vapor. In the summary of the work, results are discussed and following consequencies are expressed.
Description
katedra: NTI; rozsah: 100
Subject(s)
in-situ chemická oxidace, fentonovo činidlo (fč), charakteristiky a vlivy na fč, pilotní test fč, mobilizace těžkých kovů, meziprodukty, isco, fenton's reagent, primary factors on fr, pilot scale of the fr, mobilization hm, byproducts