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 50 mg L−1 Ni2 + , the dilute resistivity of the EDI could achieve 3 MΩ cm which gave a Ni2 +  rejection more than 99.8% while the Ni2 +  was concentrated as high as 1,583 mg L−1 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.

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