Combination of captivator and fixed film bioreactor solutions
AssigneeEvoqua Water Technologies LLC
InventorsArgun O. Erdogan, Michael L. Doyle, Deborah Hyke
Life of this patent
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Abstract
A wastewater treatment system including a contact tank, a dissolved air flotation unit, a fixed film reactor, and a solids-liquid separation unit is disclosed. A method of treating wastewater with a dissolved air flotation unit and a fixed film reactor is also disclosed. A method of retrofitting a fixed film reactor wastewater treatment system including providing a contact tank and a dissolved air flotation unit is also disclosed. A method of facilitating increased operating efficiency of a fixed film wastewater treatment system including providing a dissolved air flotation unit is also disclosed.
Claims19
A wastewater treatment system comprising:
- a contact tank having a first inlet fluidly connectable to a source of wastewater to be treated, a second inlet, and an outlet, the contact tank configured to treat the wastewater with waste sludge to form a mixed liquor;
- a dissolved air flotation unit having a first inlet fluidly connected to the outlet of the contact tank, a second inlet fluidly connectable to a source of gas, a floated solids outlet, and an effluent outlet, the dissolved air flotation unit configured to treat the mixed liquor with the gas to form floated solids and a dissolved air flotation unit effluent;
- a fixed film reactor having a first inlet fluidly connected to the effluent outlet of the dissolved air flotation unit, a second inlet, and an outlet, the fixed film reactor configured to form a fixed film effluent;
- a solid-liquid separation apparatus having an inlet fluidly connected to the outlet of the fixed film reactor, an effluent outlet, and a waste sludge outlet in fluid communication with the second inlet of the contact tank and the second inlet of the fixed film reactor;
- and a sludge mixing tank having a first inlet fluidly connected to the waste sludge outlet of the solid-liquid separation apparatus, a second inlet fluidly connected to the floated solids outlet of the dissolved air flotation unit, and an outlet fluidly connected to the second inlet of the contact tank.
A method of treating wastewater comprising:
- introducing the wastewater and a waste sludge into a contact tank and mixing the wastewater with the waste sludge in the contact tank to form a mixed liquor;
- directing at least a portion of the mixed liquor to a dissolved air flotation unit and separating the mixed liquor to form a dissolved air flotation unit effluent and waste biosolids;
- directing the dissolved air flotation unit effluent to a fixed film reactor and biologically treating the dissolved air flotation unit effluent to form a fixed film effluent;
- directing the fixed film effluent to a solid-liquid separation apparatus and separating the fixed film effluent to form a solids-lean effluent and the waste sludge;
- selectively recycling a first portion of the waste sludge to a sludge mixing tank and a second portion of the waste sludge to the fixed film reactor;
- directing the waste biosolids to the sludge mixing tank and mixing the waste biosolids with the first portion of the waste sludge to form a mixed sludge;
- directing the mixed sludge to the contact tank;
- and
- directing the solids-lean effluent to a treated wastewater outlet.
Dependencies are inferred from the claim text.