Dye-sensitized photo-oxidation process for disinfection of secondary municipal wastewater in Hong Kong

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Dye-sensitized photo-oxidation process for disinfection of secondary municipal wastewater in Hong Kong

 

Author: Ma, Wing-tak
Title: Dye-sensitized photo-oxidation process for disinfection of secondary municipal wastewater in Hong Kong
Degree: M.Sc.
Year: 1994
Subject: Sewage sludge -- Disinfection
Oxidation
Electrocoagulation
Hong Kong Polytechnic -- Dissertations
Department: Multi-disciplinary Studies
Pages: 93, [4] leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1183008
URI: http://theses.lib.polyu.edu.hk/handle/200/1394
Abstract: The material presented represents results of a research on a new method for using the light energy for the disinfection of effluents from the secondary municipal wastewater treatment plants in Hong Kong. The treated effluents containing a dye-sensitizer were exposed to the illumination of halogen lamp with wavelength of visible spectrum for various periods of time as well as various conditions such as the pH and dye concentration etc. The influence of the light energy, absorbed by the sensitizer in the visible range, on the organic matter in secondary effluents was checked by determining the E. coli content of treated wastewater. In laboratory-scale experiments, over 97 % of E. coli (23000 No.) in 800 ml of secondary municipal wastewater containing 1.0 mg of methylene blue were destroyed in 30 minutes. After the photo-oxidation process, the dye colour of the treated effluent was removed by the electro-coagulation process. With the addition of a small amount of table salt to the sample wastewater and the applying of a 0.2A electrical current to the steel plate electrodes submerged in the wastewater, electrolysis process took place with the formation of iron hydroxide precipitates. The dye particles were mainly removed by sorption and flocculation of iron hydroxide precipitates. As a result, a transparent and clear solution can be obtained after filtration of the liquid resulting from this process treatment. The results of this research showed that the dye-sensitized photo-oxidation process can be applied to the effluents from secondary municipal wastewater treatment plants in Hong Kong. The application of the electro-coagulation process following the photo-oxidation process was also found to be feasible and the two processes formed a complete package for the disinfection of secondary municipal wastewater.

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