title: Neutralization/purification of the wastewaters from printed circuit boards production using waste by-products.
abstract: The purpose of this work was development of a new method for the neutralization/purification of printed circuit boards wastewater (PCBW) originating from Zagreb, Croatia, using two industrial by-products. PCBW was characterized with low pH value (2.11) and high concentration of TDS (50190 mg L(-1)), copper (4190 mg L(-1)) and iron (2660 mg L(-1)). Waste base (WB), by-product of the alumina production, and waste sludge, by-product of the electrochemical treatment of groundwater, were employed as neutralization/adsorption agents. Due to its high neutralization capacity WB was used for pH adjustment to pH 8 and heavy metals removal from both effluents, yet the final removal of the contaminants down to the regulated values was assessed by adsorption/coagulation with the iron and aluminum rich waste sludge. Following the combined treatment the removal efficiency of iron and copper was higher than 99.99% with their final concentration in the treated water of 0.151 mg L(-1) and 0.129 mg L(-1), respectively. Following the ozone base oxidation the removal efficiency of the organic contaminants was more than 83%. The successful application of the industrial waste by-products for neutralization/purification of the PCBW with the removal efficiencies of the contaminants comparable or better than those obtained with conventional treatment represented the main advantage of our presented method.
authors.affiliation: a Advanced Energy Ltd. , Zagreb , Croatia.
authors.forename: Visnja
authors.initials: V
authors.lastname: Orescanin
authors.forename: Robert
authors.initials: R
authors.lastname: Kollar
authors.forename: Ivan
authors.initials: I
authors.lastname: Halkijevic
authors.forename: Marin
authors.initials: M
authors.lastname: Kuspilic
authors.forename: Vanja
authors.initials: V
authors.lastname: Flegar
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry; D017523:Croatia; D004581:Electronics; D007220:Industrial Waste / Q000032:analysis; D007501:Iron / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D014866:Waste Products / Q000032:analysis*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D003300:Copper; D007220:Industrial Waste; D007501:Iron; D019216:Metals, Heavy; D012722:Sewage; D014866:Waste Products; D062065:Wastewater