Suitable electrolyte for electrocoagulation treatment of wastewater?

Dear friends,

We are trying to use electrocoagulation method for treating waste water generated from paper industry. Can someone please suggest which electrolyte will best suit in electrocoagulation treatment of paper industry wastewater? The electrolyte should be helpful in the adjustment of conductivity of a solution and enhance the reduction of pollutants.

Preferably electrolyte should be environment-friendly!