Patent ID: 7985576

Claim:
A method of treating flue gas and wastewater generated by treating the flue gas comprising: introducing 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 and/or reduce selected heavy metals in 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; wherein the anaerobic reactor contains selected heavy metal reducing organisms to reduce oxidized species of corresponding heavy metals contained in the FGD scrubber wastewater into insoluble form.