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Researchers have recommended application of ozonation andbiofiltration to aid coagulation in removing disinfection byproduct(DBP) precursors, but data on the efficacy of suchcombined processes have been limited. This study was conductedto investigate the effectiveness of combined processes, andvariations on them, using a raw water with high alkalinity andlow total organic carbon (TOC).The authors evaluated nine treatment simulations, all incorporatingcoagulation, ozonation, and biofiltration in the treatmenttrain. Variations in the treatment trains studied included the pointof ozonation with respect to coagulation, the ozone dosagerequired for various disinfection objectives, the pH of coagulation,ozonation, and biofiltration, and the type of biofiltration media.According to the data, the combination of ozonation, coagulation,and biofiltration proved successful in significantly reducing trihalomethaneand haloacetic acid formation potential. The point ofozonation did not affect the overall treatment of water with lowTOC and high alkalinity. In addition, study results supported previouswork by showing the correlation between the reduction of DBPformation potential and the reduction of ultraviolet absorbance.These findings should help water utilities better understandhow ozonation and biofiltration can be coupled with coagulationto comply with requirements of the Disinfectants/Disinfection Byproducts Rule. In addition to yielding a significant quantity of data,the work also provided a protocol for future research with similarobjectives. This study is the first part of a larger project examiningthe effectiveness of coagulation, ozonation, and biofiltration usingwaters with different water quality characteristics. Includes 32 references, tables, figures.

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Edition: Vol. 94 - No. 12 Published: 12/01/2002 Number of Pages: 15 File Size: 1 file , 380 KB