Methods and systems for biological treatment of flue gas...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/28 (2006.01) B01D 53/14 (2006.01) B01D 53/50 (2006.01) C02F 1/28 (2006.01)

Patent

CA 2661739

Systems and methods of treating flue gas and wastewater generated by treating the flue gas are disclosed and include introducing the flue gas, a flue gas treatment fluid that removes sulfur dioxide from the flue gas; and an organic acid conditioning agent into a wet-oxidation scrubber/absorber; introducing FGD scrubber wastewater generated by the wet-oxidation scrubber/absorber into an anoxic biological reactor to substantially denitrify the FGD scrubber wastewater; and introducing resulting substantially denitrified FGD scrubber wastewater into an anaerobic biological reactor to substantially reduce the amount of sulfate and/or selected heavy metals in the FGD scrubber wastewater.

L'invention concerne des systèmes et des procédés de traitement de gaz brûlé et des eaux usées générés par le traitement du gaz brûlé et consistant à injecter le gaz brûlé, un fluide de traitement de gaz brûlé éliminant le dioxyde de soufre du gaz brûlé et un agent de conditionnement d'acide organique dans un laveur de gaz/absorbeur par oxydation humide ; injecter les eaux usées laveur de gaz FGD générées par le laveur de gaz/absorbeur par oxydation humide dans un réacteur biologique anoxique pour sensiblement dénitrifier les eaux usées de laveur de gaz FGD ; et injecter les eaux usées de laveur de gaz FGD sensiblement dénitrifiées résultantes dans un réacteur biologique anaérobie pour sensiblement réduire la quantité de sulfate et/ou de métaux lourds sélectionnés dans les eaux usées de laveur de gaz FGD.

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