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Hazardous waste disposal regulations forced a reconsideration of process and product quality requirements to eliminate the need to treat and dispose of a hazardous sludge containing flammable solvents. This resulted in a new liquid cyclone process to replace the precoat filter system, which generated hazardous waste sludge. Besides eliminating a complex, labor-intensive, material-wasting process, replacement of the precoat filter prevented further generation of ignitable hazardous waste.
The new process, using liquid cyclones to make the required liquid-solids separation, must have a gas-free feed for efficient operation. Beneficial particle classification, a result of the cyclone process, improved material efficiencies and had no discernible negative effects on product quality.
The liquid cyclone system designed to separate suspended solids from a polymer solution, and its interrelation with the contiguous processes are described in this paper. Product and beneficial process changes resulting from the system change are also discussed.
liquid cyclones, hazardous waste, precoat filter sludge, flammable solvents, solvent sludge, extraction, solids removal, waste minimization
Associate engineer, Flexel Kansas, Inc., Tecumseh, KS