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Modeling enhanced coagulation to improve ozone disinfection
Author(s) -
Urfer Daniel,
Huck Peter M.,
Gag Graham A.,
Mutti Dennis,
Smith Franklyn
Publication year - 1999
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1999.tb08600.x
Subject(s) - ozone , coagulation , contactor , water treatment , volumetric flow rate , water quality , chemistry , environmental engineering , water flow , environmental chemistry , environmental science , thermodynamics , psychology , ecology , power (physics) , physics , organic chemistry , psychiatry , biology
Empirical modeling accurately predicts the benefits of enhanced coagulation in an investigation at full scale. Use of enhanced coagulation to improve disinfection capabilities ( C X T ) of a postsedimentation ozonation system was investigated at full scale at the Mannheim Water Treatment Plant in Kitchener, Ont. Multiple linear regression was used to assess the effects of different water quality, environmental, and engineered parameters on the average ozone (O 3 ) concentration ( C avg ) in the O 3 contactor. It was found that C avg was significantly affected by the transferred O 3 dose, the settled water pH, the settled water nonpurgeable organic carbon concentration, the flow rate, and the water temperature. For the specific water tested, model predictions indicated that operation of the plant under enhanced coagulation conditions could substantially improve the disinfection capacity of the ozone system, compared with conventional coagulation. Modeling results also showed that the effect of flow rate (i.e., contact time) on C X T depended on the rate of O 3 decay. For rapid O 3 decay conditions, models predicted an increase in calculated C X T with increasing flow rate (i.e., decreased contact time).