بررسي حذف باكتري پسودوموناس آئروژينوزا از آب آشاميدني به روش فوتوالکتروشيمياييInvestigation of Pseudomonas aeruginosa removal from drinking water using photo-electrochemical method

گيتي كاشي, نيلوفر حجازي مهر, سعید یاورپور

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چکیده

ABSTRACT

Background and Aims: Water disinfection by electrochemical methods is widely used in the recent years.

The goal of this research is to investigate of Pseudomonas aeruginosa, as a source of nosocomial infection

caused by waterborne bacteria, removal from drinking water by batch photoelectrochemical reactor using

zinc-copper electrode and lamp emitting dynode UV-A lamp.

Materials and Methods: In this study, the contaminated water sample was prepared through adding 102 and

103 P. aeruginosa per ml of drinking water. Different conditions were studied, including pH (6-8), number

of bacteria (102-103 per milliliter), radiation time (7.5-45 min), lamp intensity (360-600 mW / cm2), distance

between lamp and electrode (1.5 cm), and current density (3-9 mW / cm2).

Results: In electrochemical reactor, percentage of 103 bacterium / ml removal in distance 1.5 cm, current

density 6 mW / cm2 and electrolysis time 7.5 min in pHs 6, 7, and 8 were obtained 95%, 96.5%, and 95.9%,

respectively. In electrochemical reactor, percentage of 102 bacteria / ml removal in distance 1.5 cm, current

density 6 mW / cm2 and electrolysis time 7.5 min in pHs 6, 7, and 8 were obtained 95.2%, 100%, and 100%,

respectively. In photoelectrochemical reactor, percentage of 103 bacterium / ml removal in distance between

lamp and electrode 1.5 cm, radiation intensity 600 mW/cm2, current density 6 mW / cm2, and radiation time

7.5 min in pHs 6, 7, and 8 were obtained 96%, 100%, and 100%, respectively. In photoelectrochemical

reactor, percentage of 102 bacteria / ml removal in distance between lamp and electrode 1.5 cm, radiation

intensity 600 mW/cm2, current density 6 mW / cm2 and radiation time 7.5 min in pHs 6, 7, and 8 were

obtained 100%, 100%, and 100%, respectively.

Conclusion: The findings indicated that bacterium removal efficiency was increased with increasing current

density, increasing radiation time, increasing lamp intensity, and decreasing number of bacteria.

Key words: Bacterium, Disinfection, Drinking water, Photo electrochemical, Pseudomonas aeruginosa

*Corresponding Author:

Department of Environmental Health, Faculty Health, Islamic Azad University, Branch of Medical, P.O Box,1916893813,

Tehran, Iran

Tel: +982122006667

Email: g.kashi@yahoo.com

Received: 7 Oct. 2013

Accepted: 13 Jan. 2014


 

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