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Main Title Waste stabilization lagoon microorganism removal efficiency and effluent disinfection with chlorine /
Author Johnson, Bruce A. ; Wight, Jeffrey L. ; Bowles, David S. ; Reynolds, James H. ; Middlebrooks, E. Joe
Other Authors
Author Title of a Work
Johnson, Bruce A.
CORP Author Municipal Environmental Research Laboratory.
Publisher Environmental Protection Agency, Office of Research and Development [Office of Energy, Minerals, and Industry], Municipal Environmental Research Laboratory ; For sale by the National Technical Information Service,
Year Published 1979
Report Number EPA/600/2-79/018; EPA-68-03-2151
Stock Number PB-300 631
Subjects Sewage lagoons. ; Sewage--Purification--Chlorination.
Additional Subjects Sewage treatment ; Lagoons(Ponds) ; Disinfection ; Chlorination ; Microorganisms ; Coliform bacteria ; Mathematical models ; Stability ; Performance evaluation ; Concentration(Composition) ; Comparison ; Biochemical oxygen demand ; Computer programs
Library Call Number Additional Info Location Last
NTIS  PB-300 631 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation xxiii, 360 pages : illustrations, graphs ; 28 cm.
This project had two major objectives: (1) to evaluate the amenability of algae-laden lagoon effluent to chlorine disinfection; and (2) to evaluate the performance of a multi-cell lagoon system in removing coliform bacteria by natural means without the need for disinfection. Results indicate that adequate disinfection was obtained with combined chlorine residual within a contact period of 60 minutes. Filtered effluent was found to exert less chlorine demand tha unfiltered. Temperature, sulfide, and total chemical oxygen demand were the most important factors affecting the chlorine dose necessary to achieve a specified bacteriological quality. A mathematical model was developed and a series of design curves were constructed for use in selecting the optimal chlorine dosages needed for achieving prescribed levels of disinfection. Total and fecal coliform removal in the lagoon system was related to hydraulic residence time. Coliform die-away rate was 16 times greater in summer months than in winter months.
Contract no. 68-03-2151. July 1979. Includes bibliographical references (pages 216-226). Microfiche.