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Zastosowanie reakcji Fentona do rozkładu utleniającego eteru etylowo-t-butylowego (ETBE) w wodnych ekstraktach benzyn

100%

Kędzierska E. , Konopka M. , Kardasz K. , Piotrowska K.

tom nr 3

223-231

W pracy podjęto próbę usuwania eteru etylowo-t-butylowego (ETBE) z wodnych ekstraktów benzyn poprzez utlenianie nadtlenkiem wodoru w reakcji Fentona. Zdolność ETBE do rozkładu pod wpływem nadtlenku wodoru w temperaturze otoczenia stanowi potencjalną możliwość usuwania tego eteru z wody zanieczyszczonej benzyną, która zawiera ETBE jako komponent.

Ethyl-t-butyl ether (ETBE) is commonly used as a fuel component, which sometimes results in its introduction into the environment, especially to ground water. The aim of this research study is to investigate the activity of Fenton's reagent with the water extracts of the fuels containing ETBE. The ETBE removal was successfully accomplished at ambient temperature in the presence of more than 0,3 g of FeSO4 catalyst per 100 cm3 of the extract.

Aerobic sludge digestion in the presence of chemical oxidizing agents. Part II. Fenton's reagent

72%

Barbusinski K. , Filipek K.

nr 3

Aerobic sludge digestion in the presence of Fenton's reagent and hydrogen peroxide was examined. Fenton's reagent considerably improved the aerobic digestion process in comparison with hydrogen peroxide as well as classical aerobic digestion. Application of Fenton's reagent also led to improvement of settling and dewatering properties of sludge and much better clarity of supernatant. Its drawback, however, is the formation of chemical precipitate and an apparent decrease in pH which might inhibit biochemical processes important for aerobic digestion efficiency.

Aerobic sludge digestion in the presence of hydrogen peroxide and Fenton's reagent

72%

Barbusinski K. , Filipek K.

nr 1

The results of comparative experiments on aerobic digestion of excessive activated sludge using hydrogen,peroxide and Fenton’s reagent are described. Fenton’s reagent was found to have a higher oxidation potential and, as a consequence, higher efficiency in a digestion process in comparison to hydrogen peroxide. Moreover, Fenton’s reagent was shown to improve sedimentation properties of sludge and to decrease soluble COD more efficiently than H2O2. The main advantage of the Fenton’s reagent application was the fact that oxidation processes took place even though Fenton’s reagent was no longer added. On the other hand, the apparent disadvantage of its application is the formation of additional chemical sediments and possible decomposition of sludge flocs as a result of overdosage of reagents and, consequently, an increase in turbidity of supernatant liquid and some difficulties with sludge dewatering.

Effect of sludge conditioning by chemical methods with magnetic field application

72%

Krzemieniewski M. , Debowski M. , Janczukowicz W. , Pesta J.

tom 12

nr 5

The feasibility of magnetic field was examined as a factor affecting sludge conditioning intensification. In the experiment sludge after preliminary anaerobic digestion was used, coming from a domestic wastewater treatment plant. Digested sludge was taken directly from a fermentation tank. The experiment was run in three phases. They were performed on a laboratory scale, at various experimental stands. Different dosages of iron chloride, hydrogen peroxide and Fenton's reagent were applied to determine their influence on the sludge properties as well as the effect of constant magnetic field on the conditioning parameters was determined. Straight dependence was found between dosage of the reagents and the way of sludge introduction in the magnetic activity zone, as well as physical and chemical parameters of the prepared sludge.