Anoxic bioreactor treatment followed by pH adjusted peroxide/iron treatment for enhanced, efficient selenium removal in wastewaters
AssigneeEvoqua Water Technologies LLC
InventorsAndrew Black, Luke Halverson, Timothy Pickett, Rebeccah Chapman
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Abstract
A method of treating selenium-containing wastewater comprises performing anoxic biological treatment of the selenium-containing wastewater to produce a first liquid including a residual dissolved selenium species, introducing an oxidant into the first liquid to form an oxidant-treated first liquid, introducing a coagulant into the oxidant-treated first liquid to form a second liquid having selenium-containing solids, and removing the selenium-containing solids from the second liquid in a solids-liquid separation operation.
Claims12
A system for treatment of selenium-containing wastewater, the system comprising:
- an anoxic bioreactor having an inlet fluidically connectable to a source of the selenium-containing wastewater and an outlet;
- a pretreatment system including a catalytic oxidation media bed connected between a source of the selenium-containing wastewater and the anoxic bioreactor;
- a source of an oxidant configured to introduce the oxidant into a conduit fluidically coupled to and downstream of the outlet of the anoxic bioreactor;
- a source of a coagulant configured to introduce the coagulant into the conduit downstream of the outlet of the anoxic bioreactor;
- and
- a solids-liquid separator having an inlet in fluid communication with the conduit downstream of a point of introduction of the coagulant and downstream of a point of introduction of the oxidant, a solids outlet, and a liquids outlet.
Dependencies are inferred from the claim text.