A new method of chlorophenols decomposition based on UV-irradiation by XeBr-excilamp and their subsequent biodegradation

E. A. Sosnin; G. G. Matafonova; V. B. Batoev; N. Christofi

doi:10.1117/12.785675

19 February 2008 A new method of chlorophenols decomposition based on UV-irradiation by XeBr-excilamp and their subsequent biodegradation

E. A. Sosnin, G. G. Matafonova, V. B. Batoev, N. Christofi

Author Affiliations +

Proceedings Volume 6938, Atomic and Molecular Pulsed Lasers VII; 693815 (2008) https://doi.org/10.1117/12.785675
Event: Atomic and Molecular Pulsed Lasers VII, 2007, Tomsk, Russian Federation

Abstract

The combined decomposition method of chlorophenols (CP) is offered. The method is based on photolysis of CP through XeBr-excilamp UV irradiation at 283 nm in a flow photoreactor with subsequent treatment of photolysis products by microorganism-destructor B. cereus isolated from an aeration pond of Baikal pulp-and-paper mill. At initial concentration of CP of 20 mg/l the polluted solutions can be utilized directly by means of biological treatment using B. cereus under aerobic conditions. However, if the initial CP concentration is higher than 20 mg/l, the polluted solutions are low biodegradable. It is shown, that the combined treatment is most effective method in this case. At initial CP concentration of 50 mg/l and higher it is suggested to use the deep preliminary UV-treatment with the purpose of removal 80-90 % of initial CP. It is revealed, that 4-CP is relatively persistent compound for B. cereus, easily decomposed by UV-radiation of XeBr-excilamp. As a result of subsequent biological treatment during 10 days the utilization of basic CP photoproducts is obtained. Experimentally, the preliminary UV-processing time was essentially less than that found earlier by E. Tamer, Z. Hamid, Aly A. (Chemosphere, 2006), where the half-life periods of initial CP were from 2.2 to 54 hours at the same value of initial concentration of CP. Correspondingly, the total CP decomposition process was accompanied by high power inputs. It is suggested to use mentioned above method for effective CP decomposition at high concentration values.

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E. A. Sosnin, G. G. Matafonova, V. B. Batoev, and N. Christofi "A new method of chlorophenols decomposition based on UV-irradiation by XeBr-excilamp and their subsequent biodegradation", Proc. SPIE 6938, Atomic and Molecular Pulsed Lasers VII, 693815 (19 February 2008); https://doi.org/10.1117/12.785675

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KEYWORDS

Photolysis

Ultraviolet radiation

Lamps

Excimers

Californium

Oxidation

Ultraviolet sources

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