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Ecologically friendly wastewater disinfection techniques
Year:
1997
Source of publication :
Water Research
Authors :
Acher, Aureliu J.
;
.
Fischer, Erwin
;
.
Turnheim, Roni
;
.
Volume :
31
Co-Authors:
Acher, A., Volcani Center, Institute of Soils and Water, P.O. Box 6, Bet Dagan 50250, Israel
Fischer, E., Volcani Center, Institute of Soils and Water, P.O. Box 6, Bet Dagan 50250, Israel
Turnheim, R., Volcani Center, Institute of Soils and Water, P.O. Box 6, Bet Dagan 50250, Israel
Manor, Y., Sheba Medical Center, Central Virology Laboratory, Ramat Gan, Israel
Facilitators :
From page:
1398
To page:
1404
(
Total pages:
7
)
Abstract:
The toxicity of the by-products found in water disinfected by chlorination methods prompted the regulatory agencies to insist on the use of alternative, ecologically friendly methods. This paper presents new disinfection techniques developed in our laboratory, which use sunlight or artificial UV radiation to promote photochemical disinfection processes. The sunlight was either used as global irradiation or concentrated by mirrors via an intermediary photosensitizer dissolved in water. Under these conditions the sunlight produces oxidative species in water which kill the microorganisms and oxidize organic materials. The disinfection efficiency of these methods has been proven in two experimental pilot plants operating in a continuous process with outputs of 50 and 0.15 m3 h-1, and retention times of 35 min and 3 s, respectively. The former process is economically competitive and is ready for practical use, especially in countries with high solar radiation flux densities. Data about a potential industrial application of concentrated solar radiation for detoxification of industrial wastewater polluted by a pesticide (bromacil) are presented. A new technique was used for UV (254 nm) water disinfection; it employs custom-designed elliptical UV reflectors which concentrate the radiation on a UV-transparent pipe through which the wastewater flows. The 5 m3 h-1 laboratory installation provided efficient disinfection of wastewater with turbidities up to 20 NTU. For large UV water disinfection plants (> 100 m3 h-1), a new design is proposed, which could replace the present gravitational systems.
Note:
Related Files :
Bromacil
E. coli
pesticides
Photochemical reactions
Solar radiation
ultraviolet radiation
waste water management
wastewater treatment
Show More
Related Content
More details
DOI :
10.1016/S0043-1354(96)00000-0
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30907
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:58
Scientific Publication
Ecologically friendly wastewater disinfection techniques
31
Acher, A., Volcani Center, Institute of Soils and Water, P.O. Box 6, Bet Dagan 50250, Israel
Fischer, E., Volcani Center, Institute of Soils and Water, P.O. Box 6, Bet Dagan 50250, Israel
Turnheim, R., Volcani Center, Institute of Soils and Water, P.O. Box 6, Bet Dagan 50250, Israel
Manor, Y., Sheba Medical Center, Central Virology Laboratory, Ramat Gan, Israel
Ecologically friendly wastewater disinfection techniques
The toxicity of the by-products found in water disinfected by chlorination methods prompted the regulatory agencies to insist on the use of alternative, ecologically friendly methods. This paper presents new disinfection techniques developed in our laboratory, which use sunlight or artificial UV radiation to promote photochemical disinfection processes. The sunlight was either used as global irradiation or concentrated by mirrors via an intermediary photosensitizer dissolved in water. Under these conditions the sunlight produces oxidative species in water which kill the microorganisms and oxidize organic materials. The disinfection efficiency of these methods has been proven in two experimental pilot plants operating in a continuous process with outputs of 50 and 0.15 m3 h-1, and retention times of 35 min and 3 s, respectively. The former process is economically competitive and is ready for practical use, especially in countries with high solar radiation flux densities. Data about a potential industrial application of concentrated solar radiation for detoxification of industrial wastewater polluted by a pesticide (bromacil) are presented. A new technique was used for UV (254 nm) water disinfection; it employs custom-designed elliptical UV reflectors which concentrate the radiation on a UV-transparent pipe through which the wastewater flows. The 5 m3 h-1 laboratory installation provided efficient disinfection of wastewater with turbidities up to 20 NTU. For large UV water disinfection plants (> 100 m3 h-1), a new design is proposed, which could replace the present gravitational systems.
Scientific Publication
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