During the waste determination process, the CHO will determine whether or not you may put the remains of your chemical process down the sink to the sanitary sewer.
In general, non-water soluble items (such as powders, solvents, paints, paint thinners, etc.) should never be put down any drain. Some of these items may not necessarily be regulated as hazardous waste, but should still be managed in a proper manner.
Examples of acceptable discharges to the sanitary sewer:
Additionally, the Richmond Sanitary District has approved Earlham's discharge of currently used fabric dye solutions (Art Dept. - Weaving) and certain currently used biological dye solutions in the Biology and Chemistry departments (in negligible quantities only).
Examples of unacceptable discharges to the sanitary sewer: