US 12,264,091 B1 · Wastewater treatment system

Abstract

Water treatment systems for year round consistent achievement of less than 2.5 mg/L of total nitrogen from a gray water starting effluent having about 65 mg/L of total nitrogen. The system may include a septic tank, an anaerobic upflow filter (AUF) that receives wastewater from the septic tank, a recirculating media filter (RMF) that receives wastewater from the AUF, and an anoxic denitrification filter that receives wastewater from the RMF. A drain field may be positioned downstream from the denitrification filter for ultimate disposal of the wastewater. The AUF may reduce the biological oxygen demand (BOD), although its presence also aids the combination of the RMF and denitrification filter that follow to consistently achieve <2.5 mg/L of total nitrogen in the system effluent. An equalization tank, recirculation tank, one or more recycle loops, and various pump stations may also be included. The system may be configured as a two-stage system.

Claims19

Dependent claims

A water treatment system for consistently achieving less than 2.5 mg/L of total nitrogen from a total wastewater starting influent having at least about 30 mg/L of total nitrogen, the system comprising:

a septic tank;
an anaerobic upflow filter (AUF) receiving wastewater from the septic tank;
a recirculating media filter (RMF) receiving wastewater from the AUF;
a denitrification filter receiving wastewater from the RMF and comprising a lined excavation, a wood-based media mixture, inlet and outlet manifolds, and wherein the denitrification filter is divided into a plurality of dosing sections that are dosed in sequence;
a heated alkalinity feed system positioned for feeding an alkalinity adjustment solution for increasing alkalinity into the wastewater before entrance of the wastewater into the RMF;
and
a drain field disposal downstream from the denitrification filter.

4 more elements

A water treatment system for consistently achieving less than 2.5 mg/L of total nitrogen from a gray water starting influent having at least about 40 mg/L of total nitrogen, the system comprising:

a septic tank;
a flow equalization tank receiving wastewater from the septic tank;
an anaerobic upflow filter (AUF) receiving wastewater from the flow equalization tank;
a recirculation tank receiving wastewater from the anaerobic upflow filter;
a recirculating media filter (RMF) receiving wastewater from the recirculation tank;
an RMF effluent pump station for recycling a portion of effluent from the RMF to the recirculation tank, at a selected recycle ratio;
a denitrification filter fed by the portion of effluent from the RMF that is not recycled to the recirculation tank and comprising a lined excavation, a wood-based media mixture, inlet and outlet manifolds, and wherein the denitrification filter is divided into a plurality of dosing sections that are dosed in sequence;
a heated alkalinity feed system positioned for feeding an alkalinity adjustment solution for increasing alkalinity into the wastewater before entrance of the wastewater into the RMF;
a 2nd recirculation tank receiving wastewater from the denitrification filter;
a 2nd RMF receiving wastewater from the 2nd recirculation tank;
a 2nd RMF effluent pump station for recycling a portion of effluent from the 2nd RMF to the 2nd recirculation tank;
an effluent recycle and drain field pump station receiving wastewater from the 2nd RMF;
and
a drain field disposal system receiving wastewater from the effluent recycle and drain field pump station.

11 more elements

A water treatment system for consistently achieving less than 2.5 mg/L of total nitrogen from a total wastewater starting influent having about 40 to about 80 mg/L of total nitrogen, the system comprising:

a septic tank;
a flow equalization tank receiving wastewater from the septic tank;
an anaerobic upflow filter (AUF) receiving wastewater from the flow equalization tank;
a 1st stage recirculation tank receiving wastewater from the anaerobic upflow filter;
a 1st stage recirculating media filter (RMF) receiving wastewater from the 1 stage recirculation tank;
a 1st stage RMF effluent pump station for recycling a portion of effluent from the 1st stage RMF to the 1st stage recirculation tank, at a selected recycle ratio;
a 1st stage denitrification filter fed by the portion of effluent from the 1st stage RMF that is not recycled to the 1st stage recirculation tank and comprising a lined excavation, a wood-based media mixture, inlet and outlet manifolds, and wherein the 1st stage denitrification filter is divided into a plurality of dosing sections that are dosed in sequence;
a heated alkalinity feed system positioned for feeding an alkalinity adjustment solution for increasing alkalinity into the wastewater before entrance of the wastewater into the 1st stage RMF;
a 2nd stage recirculation tank receiving wastewater from the 1st stage denitrification filter;
a 2nd stage RMF receiving wastewater from the 2nd stage recirculation tank;
a 2nd stage RMF effluent pump station for recycling a portion of effluent from the 2nd stage RMF to the 2nd stage recirculation tank;
a 2nd stage denitrification filter fed by the portion of effluent from the 2nd stage RMF that is not recycled to the 2nd stage recirculation tank;
an effluent recycle and drain field pump station receiving wastewater from the 2nd stage denitrification filter;
and
a drain field disposal fed by the effluent recycle and drain field pump station;
wherein the system consistently achieves <2.5 mg/L of total nitrogen during each month of the year, year-round, in a cold weather climate.

13 more elements

Dependencies are inferred from the claim text.

Wastewater treatment system

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Wastewater treatment system

Life of this patent

Abstract

Claims19