MULTICOMPONENT CONTROL OF BROWNSTOCK WASHING

Stringent effluent standards require improved washing efficiency and c ontrol. The organic content of streams from the washing process affect s the formation of chlorinated organics. Current washing control strat egies focus on inorganic materials recovery and measure organics recov ery only by inference. A laboratory displacement cell simulates a wash ing stage to measure inorganics concentration, total dissolved solids, and dissolved lignin. Using ultraviolet absorbance and refractive ind ex techniques with conductivity to measure washing performance can det ect otherwise unnoticed problems.