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|1. (WO2018179203) EXHAUST GAS TREATMENT DEVICE AND EXHAUST GAS TREATMENT METHOD|
|Applicants:||MITSUBISHI HEAVY INDUSTRIES ENGINEERING, LTD.
|Title:||EXHAUST GAS TREATMENT DEVICE AND EXHAUST GAS TREATMENT METHOD|
An exhaust gas treatment device comprises: a flue gas desulfurization unit 13 that emits desulfurization wastewater 12 containing sulfate ions; a membrane treatment unit 16 that has a separation membrane 16a that separates a separated liquid 12A, resulting from separating solids and liquid from the desulfurization wastewater 12, into permeated water 14 in which the sulfate ion is reduced and concentrated water 15 in which the sulfate ion is concentrated; a forward osmosis membrane device 19 that has a supply solution accommodation unit 17 to accommodate, as a supply solution 14A, the permeated water 14, a drive solution accommodation unit 18 to accommodate, as a drive solution 15A, the concentrated water 15 having a higher osmotic pressure than the permeated water 14, and a water permselective forward osmosis membrane 19a disposed between the supply solution accommodation unit 17 and the drive solution accommodation unit 18; a diluted drive solution return line L4 that returns, as a desulfurization treatment liquid 11, a diluted drive solution 15B, which is diluted by water being transferred to the drive solution 15A side by way of forward osmosis, to the flue gas desulfurization unit 13 side; and a non-wastewater processing unit 21 that transmits water from the supply solution 14A by way of forward osmosis and does not drain a concentrated supply solution 14B.