Degradation of Recalcitrant Chlorinated Organics by Radiochemical and Biochemical Oxidation

Berge, D.; Ratnaweera, Harsha; Efraimsen, Harry

doi:10.2166/wst.1994.0716

Cited by 14 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Adsorbable organic halogens (AOX) are also responsible for the high toxicity of the effluente (27) and are difficult to degrade. Biological digestion usually takes 10-20 days for degradation of 30% (28).…”

Section: Resultsmentioning

confidence: 99%

Photoassisted Electrochemical Degradation of Organic Pollutants on a DSA Type Oxide Electrode: Process Test for a Phenol Synthetic Solution and Its Application for the E1 Bleach Kraft Mill Effluent

Freire

Durán

et al. 2001

Environ. Sci. Technol.

View full text Add to dashboard Cite

In this paper, the performance of a photoassisted electrolysis process, for the degradation of organic pollutants, is investigated. Results obtained in this work have shown that the thermally prepared anode of titanium, coated with 70TiO2/30RuO2, exhibits photoactivity and may be used for the treatment of effluents. A synthetic phenol aqueous solution and a real paper mill industry effluent were treated. Kinetic analysis showed a synergetic effect of electrolysis and photocatalysis and degradation rates are an order of magnitude greater than the sum of the results reached by using both processes individually. Using a 125 W mercury bulb and 20 mA cm-2, the phenol concentration decayed 85% in 90 min and 70% reduction of TOC was obtained. In the application of the treatment process for the degradation of the E1 bleach Kraft mill effluent, total phenols were practically eliminated in a short period of processing time, and color, usually resistant to biological treatment, was reduced to 10% from its initial value measured in terms of absorbance. Reductions of AOX, COD, and BOD by 25%, 30%, and 35%, respectively, were also observed.

show abstract

Section: Resultsmentioning

confidence: 99%

Photoassisted Electrochemical Degradation of Organic Pollutants on a DSA Type Oxide Electrode: Process Test for a Phenol Synthetic Solution and Its Application for the E1 Bleach Kraft Mill Effluent

Freire

Durán

et al. 2001

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Dissociative capture of intermediates is quite common during ELT. For example, ELT is suitable to neutralize toxic and carcinogenic organochlorine impurities such as dichloroethane, trichloroethane, trichlorethylene, tetrachlorethylene, chlorobenzene, chlorophenols, dichlorophenols, pentachlorophenols or some others. ,,,,− In the presence of organochlorine impurities, the synergistic effect of the combined use of radiolysis and ozonolysis is most often observed. ,,− Ozone is inevitably formed due to the radiolysis of air between the beam window of the accelerator and the flow of water subjected to irradiation. Due to the high oxidizing ability (Figure ), ozone itself is a very effective means of disinfecting impurities in water; − therefore, radiolytic ozone is advisible for use in enhancing the radiolytic treatment of water.…”

Section: Combined Application Of Treatment Methodsmentioning

confidence: 99%

The Green Method in Water Management: Electron Beam Treatment

Пономарев

Ершов

2020

Environ. Sci. Technol.

View full text Add to dashboard Cite

During the prebiotic era, radiolytic transformations in the oceans played a key role in purifying water from toxic impurities and, thus, played a role in the formation of the aquatic environment of our planet, making it suitable for the emergence of life. Today, the planet again faces the challenge of how to provide people with clean water. Therefore, it is reasonable to look back at past historical stages and again consider the possibility of neutralizing pollutants in water by means of radiolysis, which has already been tested by time. Modern radiolytic treatments can be much faster and safer thanks to the advent of powerful electron accelerators and high-rate electron beam treatment (ELT) of water and wastewater. Radiolytic treatment of water using accelerated electrons corresponds to the essence of advanced oxidative technologies and green chemistry. The ELT of water instantly generates a high concentration of short-lived radicals that can quickly neutralize and decompose chemical and bacterial pollutants. Due to the ability of accelerated electrons to penetrate into a substance, ELT provides the decomposition of both dissolved and suspended pollutants. The cleaning effect of ELT is due to the ability to inactivate toxic and chromophore functional groups, transform impurities into an easily removable form, damage the DNA of microorganisms and their spore forms, and increase the biodegradability of organic impurities. The use of ELT in water treatment provides significant savings in chemical reagents, thereby improving quality and reducing the number of cleaning steps. The compactness, high degree of automation of the equipment used, energy efficiency, high productivity, and excellent compatibility with traditional water treatment methods are important advantages of ELT. Unlike conventional chemicals, the excess radicals generated in the ELT process are converted back to water and hydrogen; thus, the chemical and corrosive activity of water does not increase. Equipping research institutes with electron accelerators, developing cheaper accelerators, and granting government support for pilot projects are key conditions for introducing ELT into water treatment practice.

show abstract

“…These AOPs are not very efficient in generating hydroxyl radicals and are sensitive to the presence of hydroxyl radical scavengers. Longer irradiation or reaction durations are needed to treat wastewater with high concentrations of pollutants and radical scavengers (Berge et al, 1994). AOP pretreatments have led to enhanced biodegradation of some aromatic compounds such as PCBs (polychlorinated biphenyls) and PAHs (polynuclear aromatic hydrocarbons) (Aronstein et al, 1995;Carberry et al, 1995;Martens et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Process for degradation of nitrobenzene: Combining electron beam irradiation with biotransformation

Zhao

Ward

Lubicki

et al. 2001

Biotech & Bioengineering

View full text Add to dashboard Cite

Electron beam irradiations of aqueous solutions containing 15-30 mg/L of nitrobenzene at 60 kGy dose removed 78% of the contaminant. Three mononitrophenols were detected as by-products of electron beam treatment of nitrobenzene. A mixed culture enriched on a mixture of 2-, 3-, and 4-nitrophenol degraded both the residual nitrobenzene and the nitrophenol products. Percentage removal of nitrobenzene increased with increasing electron beam dose. This observation led to the conceptual design of a two-stage electron beam microbial process for degradation of nitrobenzene. Three groups of pure isolates were characterized from the mixed culture based on their abilities to grow on cor- responding nitrophenol substrates: Group A, 2NP(-)3NP(-)4NP(+); Group B, 2NP(+)3NP(+)4NP(-); and Group C, 2NP(-)3NP(+)4NP(-). Bacteria that grew on 3-NP transformed nitrobenzene into ammonia in the electron beam-treated nitrobenzene samples.

show abstract

Degradation of Recalcitrant Chlorinated Organics by Radiochemical and Biochemical Oxidation

Cited by 14 publications

References 0 publications

Photoassisted Electrochemical Degradation of Organic Pollutants on a DSA Type Oxide Electrode: Process Test for a Phenol Synthetic Solution and Its Application for the E1 Bleach Kraft Mill Effluent

Photoassisted Electrochemical Degradation of Organic Pollutants on a DSA Type Oxide Electrode: Process Test for a Phenol Synthetic Solution and Its Application for the E1 Bleach Kraft Mill Effluent

The Green Method in Water Management: Electron Beam Treatment

Process for degradation of nitrobenzene: Combining electron beam irradiation with biotransformation

Contact Info

Product

Resources

About