AWWA JAW49195

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, Ontario. Multiple linear regression was used to assess the effects of different water quality, environmental, and engineered parameters on the average ozone (O3) concentration (C avg) in the O3 contactor. It was found that C avg was significantly affected by the transferred O3 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 O3 decay. For rapid O3 decay conditions, models predicted an increase in calculated C x T with increasing flow rate (i.e., decreased contact time). Includes 41 references, tables, figures.

Product Details

Edition:

Vol. 91 - No. 3

Published:

03/01/1999

Number of Pages:

15

File Size:

1 file , 860 KB