Excess residual MACROTROL 9210 and NALCO 9380 not deactivated by natural solids or turbidity in water must be detoxified prior to discharge to a receiving stream using the proprietary compound NALCO 1315 (a stabilized clay slurry) or bentonite clay at a minimum ratio of 5 ppm clay to 1 ppm product.
Feed clay continuously to the outfall to ensure maximum distribution and mixing with the water to be detoxified.