Accession Number : ADA135437

Title :   A Replacement for the Silt Density Index: Permanganate Demand to Predict Reverse Osmosis Membrane Fouling.

Descriptive Note : Doctoral thesis,


Personal Author(s) : Binovi,R

Full Text :

Report Date : 13 Oct 1983

Pagination or Media Count : 204

Abstract : A new test to predict the fouling potential of a reverse osmosis (RO) feedwater was developed. The Permanganate Demand Test is based on both of the accepted equations used to describe the solvent and solute flow through the membrane. It characterizes the reduction in solvent flow by an increase in the osmotic pressure at the membrane. The Silt Density Index (SDI) is a membrane test that has come into widespread use to predict the fouling potential of a feedwater. RO processes can be expected to operate successfully over a long period of time without significant reduction in permeate flux if the SDI values are between 2 and 5.3, on a scale of 1 to 6.67. The SDI was found to be sensitive to suspended particles large enough to be measured as turbidity, but insensitive to dissolved metal concentrations.

Descriptors :   *Fouling , *Membranes , *Feed water , *Reverse osmosis , Organic acids , Chemical analysis , Test methods , Permanganates , Equations , Predictions , Solvents , Solutes , Flow , Reduction , Osmotic pressure , Permeability , Flux(Rate) , Silt , Density , Indexes , Turbidity , Concentration(Chemistry) , Saline solution , Iron , Ammonia , Sulfates

Subject Categories : Organic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE