An evaluation of variables affecting the virus removal capabilities of the coagulation-filtration process Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hm50tw06f

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  • The capabilities of the coagulation-filtration process for virus removal were evaluated by constructing and operating a one step, 2 gpm coagulation-filtration pilot plant. Multi-media filters were used without pre-coagulation and sedimentation. A T2 bacteriophage was used as the indicator organism. The plant was operated under a variety of conditions in order to evaluate the effect on virus removal efficiencies of pH, coagulant aid use, and filtration rate. The process removed from 90 percent to 99.99 percent of the influent virus. The following conclusions were drawn from the data obtained. 1. The virus removal ability of the coagulation-filtration process is considerably better at a pH between 6.0 and 7.0 than at a pH of 8.0 even though effluent turbidities may remain essentially constant. 2. The use of cationic polyelectrolyte coagulant aids may enhance the virus removal ability of the process, but data collected during this investigation on the extent of improvement were unconclusive. 3. An increase in filtration rate between 3.0 and 9.0 gpm/ft² may have a somewhat negative effect on virus removal, but the difference in removal efficiency is very slight. 4. Although no exact correlation appears to exist between effluent turbidity and virus passage, and an increased virus passage can occur without being indicated by a corresponding increase in turbidity, turbidity measurements still offer a valuable index to virus passage: An increase in turbidity passage almost always demonstrates an increase in virus passage, assuming the virus are present.
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