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1

Changes in iron(II) and iron(III) content in a solution of humic acids during coagulation by means of monomeric iron(III) salts

100%
Libecki B., Dziejowski J.
Polish Journal of Environmental Studies
|
2010
|
tom 19
|
nr 5
This study discusses the results of laboratory analyses investigating the chemical coagulation of a model of humic acid solution with the use of monomeric iron(III) salts – chloride and sulfate – in a standard coagulation test environment. The objective of the study was to determine changes in iron compound concentrations in the tested solution as a result of coagulation. The following parameters were analyzed in solution samples: changes in COD, colour, turbidity, suspended solids, pH, and streaming potential in relation to the applied coagulant dose. The content of total iron (Fetotal) and iron(II) was determined in solution samples after coagulation. The lowest Fetotal concentrations were observed following the use of optimal coagulant doses, and higher doses led to a repeated increase in total iron levels. In purified solution samples, iron(III) was partially reduced to iron(II) with an 8-42% share of Fetotal, depending on salt type and the applied dose.
2

Metal salts as homogeneous catalysts for effective combustion of liquid fuels

84%
Tic W. J.
Polish Journal of Environmental Studies
|
2008
|
tom 17
|
nr 3
439-441
Findings of research on the manufacture of metallic catalysts based on iron salts and iron-and-cerium salts of fatty acids dissolved in fuel oil are presented. Fatty acid metal salts are characterized by good solubility in fuel oil and the resulting catalyst solutions show low viscosities. The obtained metallic catalysts were used in mazout combustion tests in which reduced emissions of NOx and additional heat recovery were obtained as the result of complete fuel combustion.
3

Optimization of humic acids coagulation with aluminum and iron [III] salts

84%
Libecki B., Dziejowski J.
Polish Journal of Environmental Studies
|
2008
|
tom 17
|
nr 3
397-403
Humic substances contained in ground and surface waters increase the degree of their pollution, give it a specific colour and contribute to the formation of toxic disinfection by-products in the process of water treatment. Coagulation is an effective method of removing organic compounds, including humic acids (HA), from water and wastewater. The proper selection of coagulants and optimization of such parameters as coagulant dose and the pH of the solution enable improvement of coagulation efficiency. The objective of the present study was to determine the efficiency of humic acids removal by coagulation, depending on the dose of Al and Fe(III) salts and pH of the analyzed solutions. A model alkaline solution and 0.2 M solutions of Al₂ (SO₄)₃ and Fe₂ (SO₄)₃ were used. The experiment was performed with and without pH adjustment, by a standard jar test procedure. COD-Cr [mg O₂ ·dm⁻³], colour – PtCo [mg·dm⁻³], turbidity – FTU [mg·dm⁻³], suspended solids – SS [mg·dm⁻³], pH and streaming potential – SP [mV] were determined during coagulation tests. In the solutions coagulated without pH adjustment and with the optimum doses of Al₂ (SO₄)₃ and Fe₂ (SO₄)₃ ,COD was at a level of 0.1 to 3% of the initial value and colour was removed almost completely. Iron(III) sulfate was found to be slightly more effective as a coagulant, in respect to COD removal. The results of electrokinetic measurements showed that the charge of molecules of humic colloids depends on the type and concentration of coagulating salt, as well as on the pH of the solution. The analysis of coagulation with pH adjustment revealed that there exists the optimum value of pH for each of the salt doses applied in the experiment. Coagulation with the use of Al₂ (SO₄)₃ and Fe₂ (SO₄)₃ proceeded at pH < 5.8 and pH < 4.2, respectively. A decrease in the pH of an HA solution allowed us to considerably (even eight-fold) reduce the dose of coagulants, maintaining high (above 94%) efficiency of humic acid removal by coagulation.
4
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Prooksydatywne działanie soli miedzi i żelaza w maśle

67%
Mroczkowski S.
Roczniki Państwowego Zakładu Higieny
|
1957
|
tom 08
|
nr 5
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