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Main Title Wastewater dechlorination state-of-the-art field survey and pilot studies [Microfiche] /
Author Chen, Ching-lin. ; Gan, Henry B.
Other Authors
Author Title of a Work
Gan, Henry B.
CORP Author Los Angeles County Sanitation Districts, Whittier, CA.;Municipal Environmental Research Lab., Cincinnati, OH.
Publisher U.S. Environmental Protection Agency, Municipal Environmental Research Laboratory : Center for Environmental Research Information [distributor,
Year Published 1981
Report Number EPA-14-12-150; EPA-68-03-2745; EPA-600/2-81-169
Stock Number PB82-102336
Subjects Sewage--Purification--Chlorination. ; Sulfur dioxide. ; Sulphur dioxide
Additional Subjects Sewage treatment ; Chlorination ; Sulfur dioxide ; Surveys ; Pilot plants ; Field tests ; Cost analysis ; Performance evaluation ; Dechlorination ; State of the art
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB82-102336 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 104 p. : ill. ; 28 cm.
A study of dechlorination was conducted in the County Sanitation Districts of Los Angeles County to determine the utility and efficiency of the sulfur dioxide method and to provide a cost-effectiveness comparison of sulfur dioxide and two other methods of dechlorination, namely, activated carbon and holding tank processes. Study objectives were accomplished through three main phases of work: literature review, pilot-scale testing, and full-scale evaluation in the field. The pilot-scale testing indicated that no degradation of physical and chemical water quality occurred in the dechlorinated effluents from any of the three dechlorination processes investigated. However, a one to two order of magnitude increase in total coliform density in the 10-minute samples following dechlorination was commonly observed among the three dechlorination processes. The increase seemed to originate from contamination by the existing microorganism communities in the dechlorinated effluent rather than from the reactivation of injured bacterial cells. The field survey involved the canvassing of 55 operating plants in California by mail, telephone, and site visits to selected facilities. Although overdosing of sulfur dioxide was frequently necessary to meet the residual chlorine discharge standards, most installations found pH adjustment and reaeration of the dechlorinated effluent unnecessary. Process cost estimates indicated that sulfur dioxide process is the most cost-effective method for dechlorination.
Caption title. "Sep. 1981." "EPA-600/2-81-169." Microfiche.