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1

Toxicity of industrial wastewater treated by Fenton's reagent

100%
Barbusinski K.
Polish Journal of Environmental Studies
|
2005
|
tom 14
|
nr 1
Toxicity of four types of industrial wastewater, treated by Fenton’s reagent, was analyzed. Toxicity was measured using bioluminescent bacteria Vibrio fischeri NRRL B-11177. Application of Fenton’s reagent was a efficient method for treatment of this wastewater. Nevertheless, high efficiency of organic components degradation was not always followed by reduction of toxicity to a very low level. In all cases, in order to achieve total reduction of toxicity, it was necessary to increase both the H2 O2 dose and reaction time. It was concluded that optimization of Fenton’s reaction should be performed assuming toxicity changes in the examined wastewater. Reduction in toxicity should be a critical measure of the success of this method. Such an approach should be general practice in relation to all hazardous industrial wastewater.
2

Use of Fenton's reagent for removal of pesticides from industrial wastewater

100%
Barbusinski K., Filipek K.
Polish Journal of Environmental Studies
|
2001
|
tom 10
|
nr 4
The process of pesticide (gamma -HCH and inactive isomers alpha- and beta -HCH, DDT, DMDT, fenitrothion and chlorfenvinphos) removal from industrial wastewater using Fenton's reaction has been analysed. Most of the pesticides were completely degraded at H2O2 Concentration of 2.5 g/dm(3); however, only at 5 g/dm(3) were all the examined pesticides completely removed and the results repeatable. The most effective process was for fenitrothion (from 98.5 to 100%) and chlorfenvinphos (from 97.1 to 100%), whereas organochlorine pesticides were removed with efficiency of more than 90%. The optimum ratio of [Fe2+] to [H2O2] was from 1:3 to 1:2 while the optimum pH was from 3.0 to 3.5. Tests based upon a bioluminescent bacteria Vibrio fischeri NRRL B-11177, at optimized Fenton's reaction parameters, show the reduction of toxicity to non-toxic levels.
3

Anaerobic treatment of industrial wastewater by UASB reactor integrated with chemical oxidation processes; an overview

86%
Yasar A., Tabinda A. B.
Polish Journal of Environmental Studies
|
2010
|
tom 19
|
nr 5
In order to upgrade the quality of anaerobically treated effluent to a level recommended for irrigation, integration of a UASB reactor with UV and AOPs (advanced oxidation processes) (Ozone, H2O2/UV, Fenton, and photo-Fenton) could be a better option for almost complete colour, COD removal, and disinfection of pathogens. High efficiency of the UASB can be maintained by proper process conditions, including temperature, sludge age, pH, hydraulic retention time, and gas-liquid-solid separator (GLSS) design. A fraction of the COD and colour is usually non-biodegradable and renders difficulty for anaerobic digestion. AOPs degrade the organic molecules and converting completely the organic compounds to non-toxic components such as CO2 and/or water. As far as disinfection is concerned, advanced oxidation processes are proved to be extremely effective in killing pathogens (total coliform, fecal coliform, fecal streptococci, salmonella, and E. coli) due to their strong oxidative characters. Although AOPs effectively accomplish pathogen elimination, re-growth of pathogenic microorganisms can take place in the treated effluent. Re-growth potential of pathogens provides helpful information about the quality of the treated water, which is very important in all possible reuse options. The combined application of AOPs with anaerobic treatment minimizes the chances of regrowth due to irreparable damage to nucleic acid. This review paper focuses primarily on the process conditions and treatment efficiency for UASB treatment systems, and to evaluate the advanced oxidation processes (AOPs) as an option for post treatment.
4

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

72%
Barbusinski K., Filipek K.
Polish Journal of Environmental Studies
|
2000
|
tom 09
|
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.
5

Aerobic sludge digestion in the presence of chemical oxidizing agents. Part I. Hydrogen peroxide

72%
Barbusinski K., Filipek K.
Polish Journal of Environmental Studies
|
2000
|
tom 09
|
nr 3
The process of sludge digestion using hydrogen peroxide as the only oxidizing agent was carried out. It was pointed out that the application of H2O2 to the digestion process is possible provided that aerobic conditions of the process are strictly controlled in the course of the process. Since H2O2 should be added frequently into the digestion chamber it is highly recommended to supply the digestion chamber with the aeration system. It was shown that H2O2 may also be used to upgrade putrescibled sludge, what is especially important in the break-down events and when long-term storage is needed.
6

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

72%
Barbusinski K., Filipek K.
Polish Journal of Environmental Studies
|
2003
|
tom 12
|
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.
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