Method and apparatus for simultaneous clarification and endogenous post denitifrication
AssigneeAqwise Wise Water Technologies Ltd.
InventorsRonen Itzhak Schechter, Nir Assulin
Life of this patent
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Abstract
A method for treatment of nitrified wastewater, the method including supplying wastewater to be treated to a tank having a layer of biomass supporting media near or at the top thereof, retaining biomass on and below the biomass supporting media for a sufficient time such that the biomass hydrolyses and supplies organic carbon to the wastewater in the tank; denitrifying and simultaneously clarifying the wastewater by providing an upward flow of the wastewater in the tank through the layer of biomass supporting media and discharging excess sludge from the bottom of the tank at a rate which is selected to maintain nitrate and ammonia concentrations below selected thresholds.
Claims17
A method for treatment of nitrified wastewater, the method comprising:
- supplying wastewater to be treated to a tank having a layer of biomass supporting media near or at the top thereof, said layer of biomass supporting media comprising a multiplicity of biomass carriers;
- retaining biomass on and below said biomass supporting media for a sufficient time such that said biomass hydrolyses and supplies organic carbon to said wastewater in said tank;
- and
- denitrifying and simultaneously clarifying said wastewater by providing an upward flow of said wastewater in said tank through said layer of biomass supporting media, thereby causing mutual movement and realignment of said multiplicity of biomass carriers and causing suspended solids to be accumulated in and below said biomass supporting media.
A system for treatment of nitrified wastewater, the system comprising:
- a tank having a layer of biomass supporting media retained near or at the top thereof, said layer of biomass supporting media comprising a multiplicity of biomass carriers, and operative to retain biomass on and below said biomass supporting media for a sufficient time such that said biomass hydrolyses and supplies organic carbon to said wastewater in said tank;
- an inlet near the bottom of the tank for receiving said wastewater;
- and
- a wastewater flow driver providing an upward flow of said wastewater in said tank through said layer of biomass supporting media, which causes mutual movement and realignment of said multiplicity of biomass carriers and causes suspended solids to be accumulated in and below said biomass supporting media, thereby denitrifying and simultaneously clarifying said wastewater.
Dependencies are inferred from the claim text.