DocumentCode
527106
Title
Notice of Retraction
E. coli response on chlorine dose in saline CEPT effluent
Author
Zhai, L.M. ; Yin, J. ; Huang, J.C.
Author_Institution
Sch. of Municipal & Environ. Eng., Harbin Inst. of Technol., Harbin, China
Volume
3
fYear
2010
fDate
17-18 July 2010
Firstpage
381
Lastpage
385
Abstract
Notice of Retraction
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
A 1.7-km ocean outfall has been used to transport saline CEPT (chemically enhanced primary treatment) effluent which was not chlorinated to the receiving water body. Now the effluent is being considered for chlorine disinfection using existing outfall as the chlorine contact chamber to achieve a 2-3 log reduction in E. coli counts. As no purposely built sampling locations after outfall system, a simulator study coupled with batch tests has been conducted with a pipe loop which provides a similar contact time and hydraulic regime as that existing in the field to provide valuable information to correlate the E. coli kill with the final TRC after the chlorine contact, and show the exact pattern of E. coli disinfection in saline sewage. Experimental results indicate the chlorine demand of CEPT effluent is mostly satisfied within the first 10 minutes of contact, any longer contact will only increase the demand by around 3.5% and not lead to any substantial increase in the E. coli kill. The remaining E. coli levels are mainly dependent upon the prevalent TRC levels while their contact times play only a relatively insignificant role. The comprehensive E. coli-TRC correlation curve, coupled with the observed diurnal/monthly chlorine demand variations, apparently suggests that in order to comply with a promulgated E. coli limit, a certain final TRC level must be maintained at the end of the contact. Results from this study can be used as a reference to allow the operator to determine the needed chlorine dosing level in or- er to meet discharge water quality standards in future full-scale chlorination operation.
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
A 1.7-km ocean outfall has been used to transport saline CEPT (chemically enhanced primary treatment) effluent which was not chlorinated to the receiving water body. Now the effluent is being considered for chlorine disinfection using existing outfall as the chlorine contact chamber to achieve a 2-3 log reduction in E. coli counts. As no purposely built sampling locations after outfall system, a simulator study coupled with batch tests has been conducted with a pipe loop which provides a similar contact time and hydraulic regime as that existing in the field to provide valuable information to correlate the E. coli kill with the final TRC after the chlorine contact, and show the exact pattern of E. coli disinfection in saline sewage. Experimental results indicate the chlorine demand of CEPT effluent is mostly satisfied within the first 10 minutes of contact, any longer contact will only increase the demand by around 3.5% and not lead to any substantial increase in the E. coli kill. The remaining E. coli levels are mainly dependent upon the prevalent TRC levels while their contact times play only a relatively insignificant role. The comprehensive E. coli-TRC correlation curve, coupled with the observed diurnal/monthly chlorine demand variations, apparently suggests that in order to comply with a promulgated E. coli limit, a certain final TRC level must be maintained at the end of the contact. Results from this study can be used as a reference to allow the operator to determine the needed chlorine dosing level in or- er to meet discharge water quality standards in future full-scale chlorination operation.
Keywords
chlorine compounds; desalination; effluents; hydraulic systems; microorganisms; pipes; seawater; sewage treatment; wastewater treatment; water quality; water resources; E.coli response; TRC levels; batch tests; chemically enhanced primary treatment; chlorine contact; chlorine contact chamber; chlorine demand; chlorine disinfection; chlorine dose; contact time; correlation curve; full-scale chlorination operation; hydraulic regime; ocean outfall; pipe loop; receiving water body; reduction; saline CEPT effluent; saline sewage; sampling locations; water quality standards; Atmospheric measurements; Biomedical monitoring; Effluents; Fluctuations; Microorganisms; Monitoring; Particle measurements; E. coli; TRC; chlorination; saline CEPT effluent;
fLanguage
English
Publisher
ieee
Conference_Titel
Environmental Science and Information Application Technology (ESIAT), 2010 International Conference on
Conference_Location
Wuhan
Print_ISBN
978-1-4244-7387-8
Type
conf
DOI
10.1109/ESIAT.2010.5568318
Filename
5568318
Link To Document