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Analysis of water treatment problemAssignment

Initial problem

When the river has an Suspendable Solids (SS) of 25mg/l and alkalinity of 13.5mg/l (expressed as CaCO3), 30mg/l of alum was added during the treatment process to make sure that the water passed water standards for the World Health Organisation WHO).
But subsequently the amount of SS was found to have increased to 50mg/l. Logically, when this happens, by doubling the amount of alum added initially, we would be able to generate enough precipitate to filter off the 50mg/l of SS such that the amount of SS left in the solution would be able to pass WHO drinking water standards. This did not happen thus this report is to look into the probable reasons to why the move did not work and the possible solutions to the problem.

Allowable Limits: According to the standards of Drinking water from World Health Organization (WHO), the acceptable range of alum dosage is from 5 – 50mg/l
Thus, the 60mg/l of Alum added by the Plant manager has exceeded the acceptable limit.


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Posted by: Carlos Hernandez

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