If you are treating your copper sulfate solution with sodium carbonate, you will need to save the solid copper carbonate waste for collection by a chemical waste disposal contractor.
There are other methods noted in the Science ASSIST Chemical Management Handbook for Australian Schools - Edition 1. (See pdf page 65) You may prefer to consider the method (ii)
(ii) Immerse steel wool in the solution, and thus displace the copper ions. Decant the supernatant from the precipitated copper and flush down the sink. Dispose of the copper metal residue as general waste.