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Effectiveness of coagulation, ozonation, and biofiltration in controlling DBPs
The objective of this research was to investigate the effectiveness of coagulation, ozonation, and biofiltration in controlling disinfection by‐product (DBP) formation in a drinking water with a low specific ultraviolet (UV) absorbance. Because such waters are not amenable to removal of dissolved organic carbon by coagulation, ozonation and biofiltration have been suggested as complementary treatment processes to increase removal of DBP precursors. This study was conducted at pilot scale, and the variables in the treatment train included the point of ozonation with respect to coagulation; the ozone dosage required for various disinfection objectives; the pH of coagulation, ozonation, and biofiltration; and the type of biofiltration media. Results indicated that the combination of ozonation, coagulation, and biofiltration achieved significant reductions in trihalomethane and haloacetic acid formation potential. The reduction in DBP formation potential closely paralleled the reduction in UV absorbance. Preozonation appeared to be more effective than intermediate ozonation when evaluated as a singular process. However, the total reduction in DBP formation potential was the same for the overall treatment process, regardless of the point of ozonation relative to coagulation.
Effectiveness of coagulation, ozonation, and biofiltration in controlling DBPs
The objective of this research was to investigate the effectiveness of coagulation, ozonation, and biofiltration in controlling disinfection by‐product (DBP) formation in a drinking water with a low specific ultraviolet (UV) absorbance. Because such waters are not amenable to removal of dissolved organic carbon by coagulation, ozonation and biofiltration have been suggested as complementary treatment processes to increase removal of DBP precursors. This study was conducted at pilot scale, and the variables in the treatment train included the point of ozonation with respect to coagulation; the ozone dosage required for various disinfection objectives; the pH of coagulation, ozonation, and biofiltration; and the type of biofiltration media. Results indicated that the combination of ozonation, coagulation, and biofiltration achieved significant reductions in trihalomethane and haloacetic acid formation potential. The reduction in DBP formation potential closely paralleled the reduction in UV absorbance. Preozonation appeared to be more effective than intermediate ozonation when evaluated as a singular process. However, the total reduction in DBP formation potential was the same for the overall treatment process, regardless of the point of ozonation relative to coagulation.
Effectiveness of coagulation, ozonation, and biofiltration in controlling DBPs
Chaiket, Thom (author) / Singer, Philip C. (author) / Miles, Amy (author) / Moran, Melissa (author) / Pallotta, Catherine (author)
Journal ‐ American Water Works Association ; 94 ; 81-95
2002-12-01
15 pages
Article (Journal)
Electronic Resource
English
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