Treatment of flue gas desulfurization wastewater
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The wastewater from catalytic flue gas desulfurization and sulfur tail gas desulfurization is rich in sulfates and sulfites; discharging it into the sewage treatment system is suspected to cause stress on the aeration system, so it can only be sent to acidic water stripping, but the results are not satisfactory. Seeking help.
Concentrated crystallization for salt production, for reuse or export
The sulfur exhaust gas contains a particularly high concentration of sulfur dioxide; the volume of flue gas is very small, and the amount of desulfurization wastewater is also low. The concentrations of sulfates and sulfites are high, so the suggestion mentioned above is excellent – crystallization alone is sufficient.
Can’t we first add an alkaline solution to neutralize it and then discharge it into the wastewater tank?
Acid-base neutralization also does not change the fact that wastewater contains sulfate and sulfite ions
I’m here to learn * as well; I don’t know much about it
Then use calcium hydroxide to precipitate it?
It is necessary to have more detailed data on the components
It is recommended to introduce Na+ for ion exchange, followed by evaporation crystallization using sodium sulfate; this is the best approach. However, it is necessary to understand the other components and their concentrations in your desulfurization wastewater in order to determine the final technical approach.