Recovery of nickel ions from simulated electroplating rinse water by electrodeionization process

摘要

Pure water production and recovery of Ni2+ from dilute NiSO4 solution via improved electrodeionization (EDI) process were investigated. It was indicated that, with the feed water containing 50mgL21 Ni2+, the dilute resistivity of the EDI could achieve 3MVcm which gave a Ni2+ rejection more than 99.8% while the Ni2+ was concentrated as high as 1,583mgL21 in the concentrate stream. The current efficiency was as high as 40% and the concentrate factor could reach 31.7. The experiment results demonstrated that, just in a single process, it was feasible to purifying and concentrating dilute nickel wastewater synchronously by the EDI technology.