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Gamma radiation inactivation of pathogens in sludge under larger-scale condition

Abstract

The effect of gamma radiation on microorganisms in sludge from Huay Kwang Sewage Treatment Plant and Vajira Hospital showed that total bacterial counts were reduced to 2-3 log cycles and 1-2 log cycles at 5 kGy irradiation with and without aeration, respectively. Inactivation of coliform bacteria in sludge required irradiation with and without aeration at the dosages of 3-4.5 and 4-5 kGy, respectively. A dose of 2-3 kGy was sufficient to inactivate fecal coliform bacteria and E. coli. The doses used for inactivation these bacteria depend on the irradiation condition and solid content in sludge sample. Irradiation with aeration led to an increased microbial inactivation. According to our results, the frequency of occurrence of salmonella e contaminated in sludge from Huay Kwang Sewage Treatment Plant and Vajira Hospital was 50% and 75%, respectively. A dose of 2 kGy irradiation with or without aeration, salmonella e could not be detected in any sludge. Clostridium perfringens organisms were also detected in non-irradiated and irradiated sludge from both sources. Moreover, a dose of 5 kGy irradiation with or without aeration was not enough to eliminate C. perfringens. However, no shigella e were isolated from any treatment of sludge
Publication Date:
Dec 01, 1996
Product Type:
Miscellaneous
Report Number:
INIS-TH-006; CONF-9612121-
Reference Number:
SCA: 070205; PA: AIX-29:044572; EDB-98:086067; SN: 98001995026
Resource Relation:
Conference: 6. conference on nuclear science and technology, Bangkok (Thailand), 2-4 Dec 1996; Other Information: PBD: Dec 1996; Related Information: Is Part Of Proceedings of the 6th nuclear science and technology conference; PB: 761 p.
Subject:
07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; EXPERIMENTAL DATA; GAMMA RADIATION; PATHOGENS; SEWAGE SLUDGE
OSTI ID:
635362
Research Organizations:
Office of Atomic Energy for Peace, Bangkok (Thailand)
Country of Origin:
Thailand
Language:
Thai
Other Identifying Numbers:
Other: ON: DE98632369; TRN: TH9800065044572
Availability:
INIS; OSTI as DE98632369
Submitting Site:
INIS
Size:
pp. [16]
Announcement Date:

Citation Formats

Sermkiattipong, N, and Pongpat, S. Gamma radiation inactivation of pathogens in sludge under larger-scale condition. Thailand: N. p., 1996. Web.
Sermkiattipong, N, & Pongpat, S. Gamma radiation inactivation of pathogens in sludge under larger-scale condition. Thailand.
Sermkiattipong, N, and Pongpat, S. 1996. "Gamma radiation inactivation of pathogens in sludge under larger-scale condition." Thailand.
@misc{etde_635362,
title = {Gamma radiation inactivation of pathogens in sludge under larger-scale condition}
author = {Sermkiattipong, N, and Pongpat, S}
abstractNote = {The effect of gamma radiation on microorganisms in sludge from Huay Kwang Sewage Treatment Plant and Vajira Hospital showed that total bacterial counts were reduced to 2-3 log cycles and 1-2 log cycles at 5 kGy irradiation with and without aeration, respectively. Inactivation of coliform bacteria in sludge required irradiation with and without aeration at the dosages of 3-4.5 and 4-5 kGy, respectively. A dose of 2-3 kGy was sufficient to inactivate fecal coliform bacteria and E. coli. The doses used for inactivation these bacteria depend on the irradiation condition and solid content in sludge sample. Irradiation with aeration led to an increased microbial inactivation. According to our results, the frequency of occurrence of salmonella e contaminated in sludge from Huay Kwang Sewage Treatment Plant and Vajira Hospital was 50% and 75%, respectively. A dose of 2 kGy irradiation with or without aeration, salmonella e could not be detected in any sludge. Clostridium perfringens organisms were also detected in non-irradiated and irradiated sludge from both sources. Moreover, a dose of 5 kGy irradiation with or without aeration was not enough to eliminate C. perfringens. However, no shigella e were isolated from any treatment of sludge}
place = {Thailand}
year = {1996}
month = {Dec}
}