US 10,870,596 B2 · Aerated reactor with internal solids separation

Abstract

A process for aerobic treatment of wastewater is provided, which process comprises: (a) supplying a liquid influent comprising wastewater to a reactor containing granular biomass; (b) subjecting the reaction mixture to aerobic conditions comprising a concentration of dissolved oxygen from 0.1 mg/L to 4.0 mg/L, and a hydraulic retention time from 0.5 to 72 hours; (c) separating the reaction mixture into granular biomass and treated wastewater; and (d) recycling separated granular biomass to the reaction mixture. A bioreactor for the process is also disclosed, comprising a reaction vessel provided with an aeration means, a solids separation device with an inlet in the lower part of the reaction vessel having an outlet line for solids arranged to transport separated solids to a riser driven by airlift action and arranged to transport the solids to the upper part of the reaction chamber.

Claims20

Dependent claims

A bioreactor for aerobic treatment of wastewater, comprising:

(a) a reaction vessel comprising a liquid inlet and a gas outlet, the reaction vessel having a lower part which is below half of the effective height of the reactor vessel, wherein the effective height of the reactor vessel is the maximum reactor wastewater level;
(b) one or more aerators located in the lower part of the vessel for upward moving of reactor content;
(c) a solids separation device for separating solids from liquid, located in the lower part of the reaction vessel, comprising a liquid inlet, a liquid outlet and a solids outlet;
(i) the liquid inlet of the solids separation device being located at a height of less than 75% of the effective height of the reactor vessel,
(ii) the liquid outlet of the solids separation device being connected to a liquid outlet line exiting the reactor vessel, and
(iii) the solids outlet of the solids separation device being connected to a solids outlet line ending above the one or more aerators for upward moving of reactor content.

3 more elements

Dependencies are inferred from the claim text.

Aerated reactor with internal solids separation

Life of this patent

Aerated reactor with internal solids separation

Life of this patent

Abstract

Claims20