Liquid purification or separation – Processes – Treatment by living organism
Patent
1998-06-18
1999-07-06
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210614, 210630, 210631, C02F 330
Patent
active
059193670
ABSTRACT:
This is an oxidation-reduction treatment of wastewater with biomass, comprising (a) a step of charging in the said system a recuperable oxidation-reduction mediator specie (metallic ions, metal containing species, oxyions with variable oxidation-reduction states, redox ion exchange materials, and combinations thereof), (b) a step of oxidizing terminal reducing agents with participation of the said recuperable oxidation-reduction mediator species (nitrification treatment, anoxic treatment, denitrification treatment, facultative anaerobic treatment, sulfate reduction, carbonate reduction, sludge conditioning, biomass oxidation treatment, and combinations thereof), (c) a step of reducing primary oxidizing agents with participation of the said recuperable oxidation-reduction mediator species (oxygen enriched treatment, aerobic treatment, nitrification treatment, anoxic treatment, denitrification treatment, facultative anaerobic treatment, and combinations thereof), (d) a step of retaining the said recuperable oxidation-reduction mediator specie in the treatment system in a form insoluble in the effluent, and wherein at least a portion of the said biomass together with the said recuperable oxidation-reduction mediator species are repeatedly treated in the said steps (b) and (c). The metal containing species include iron, nickel, cobalt, manganese, vanadium, and combinations thereof. This method improves the removal of hydrocarbons, nutrients, toxic and recalcitrant organics, and reduces biomass generation.
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