Przemysl Chemiczny, Vol.94, No.6, 924-929, 2015
Treatment of wastewater from the photochemical production of printed circuit boards by using Fenton reagent after addition of disodium percarbonate
Wastewater from prodn. of printed circuit boards was treated with Na2CO3.3H(2)O(2), FeSO4 and H2SO4, at 19 degrees C and pH 2.0-4.0 for 60 min (Fe2+ concn. 400-600 mg/L, Na2CO3.3H(2)O(2) concn. 8000-12000 mg/L). The chem. O-2 demand in the system decreased from 1690 mg/L down to even 432 mg/L. The results were presented as polynomial regression equations. The concn. of Cu2+ ions in the system also decreased from 25.9 mg/L down to 0.4 mg/L with the increasing pH (to 12.5).