CPC C02F 3/341 (2013.01) [C02F 3/2866 (2013.01); C02F 3/345 (2013.01); C02F 3/346 (2013.01); C02F 2101/20 (2013.01); C02F 2101/30 (2013.01); C02F 2103/10 (2013.01)] | 13 Claims |
4. A method for treating wastewater comprising
adding a sulfate containing wastewater and an effective amount of a ferric iron containing solution to an anaerobic bioreactor wherein said anerobic bioreactor is a vessel that has a top, a bottom, and one or more side walls, and one or more ports for entry of one or more influents and exit of one or more effluents, and providing said anerobic bioreactor with one or more of an iron reducing bacteria and one or more of a sulfate reducing bacteria, and one or more of a fermentative bacteria, to form a mixture in said anaerobic bioreactor of said sulfate containing wastewater, said ferric iron containing solution, said iron reducing bacteria, said sulfate reducing bacteria, and said fermentative bacteria;
maintaining an anaerobic condition in said anaerobic bioreactor; adjusting a dosage of said ferric iron containing solution to said mixture in said anaerobic bioreactor to achieve a Fe/Sulfate molar ratio that is equal to or greater than 0.50; providing an internal recirculation of said mixture in said anaerobic bioreactor; maintaining a neutral pH of said mixture in said anaerobic bioreactor; producing a sludge at said bottom of said anaerobic bioreactor; and removing an effluent from said anaerobic bioreactor that is a treated wastewater.
|