# US 11,999,644 B2 · Ferrate based water treatment

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- Number: US 11,999,644 B2
- Document ID: US11999644B2
- Status: Granted
- Kind: B2
- Application number: 17/145,652
- Filed: 2021-01-11
- Published: 2022-07-14
- Granted: 2024-06-04
- Earliest claimed: 2021-01-11
- Assignees: Ceco Environmental IP Inc.
- Applicants: Ceco Environmental IP Inc.
- Inventors: David Barker; Sammy Aquino
- Web page: https://patentgrep.com/patent/US11999644B2

## CPC

- C02F 9/00: Multistage treatment of water, waste water or sewage
- C02F 1/001: {Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00)}
- C02F 1/004: {using large scale industrial sized filters}
- C02F 1/281: {using inorganic sorbents}
- C02F 1/283: {using coal, charred products, or inorganic mixtures containing them}
- C02F 1/288: {using composite sorbents, e.g. coated, impregnated, multi-layered}
- C02F 1/5236: {using inorganic agents}
- C02F 1/5245: {using basic salts, e.g. of aluminium and iron}
- C02F 1/5281: {Installations for water purification using chemical agents}
- C02F 1/686: {Devices for dosing liquid additives}
- C02F 1/705: {Reduction by metals}
- C02F 1/72: by oxidation {(C02F1/4672 takes precedence)}
- C02F 11/143: using inorganic substances (C02F11/148 takes precedence)
- C02F 2001/007: {Processes including a sedimentation step}
- C02F 2103/365: {from petrochemical industry (e.g. refineries)}
- C02F 2209/105: Particle number, particle size or particle characterisation
- C02F 2209/40: Liquid flow rate
- C02F 2303/04: Disinfection
- C02F 2303/16: Regeneration of sorbents, filters
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

## Abstract

System and process for the treatment of water using a ferrate-based reduction-oxidation (redox) reactor, a clarifier, and a two-stage filtration system. Three treatment substrates can be used to treat water in the water treatment system and process, namely, a ferric compound(s), an acidic oxidant, and a flocculant-adsorbent.

## Claims

### Claim 1

A process for treatment of a contaminated water stream, comprising:
contacting the contaminated water with ferrate in a redox reactor to produce a redox water;
removing particulate contaminants from the redox water in a clarifier to produce a clarified water;
filtering at least a portion of the clarified water in a two-stage filtration system to produce a treated water,
wherein each step of the process is performed on a continuous basis;
feeding a first portion of a ferric compound solution to the redox reactor;
feeding a first portion of an acidic oxidant solution to the redox reactor;
contacting a ferric compound and an acidic oxidant to form the ferrate in-situ of the redox reactor;
feeding a second portion of the ferric compound solution to the clarifier;
feeding a second portion of the acidic oxidant solution to the clarifier;
feeding a raw source water to a buffer tank;
feeding a third portion of the ferric compound solution to the buffer tank;
feeding a third portion of the acidic oxidant solution to the buffer tank; and
removing the contaminated water from the buffer tank.

### Claim 2 (depends on 1)

The process of claim 1, wherein a volume ratio of the first portion to the second portion to the third portion of the ferric compound solution is in the range of 3:2:0 to 8:1:1.

### Claim 3 (depends on 1)

The process of claim 1, wherein a volume ratio of the first portion to the second portion to the third portion of the acidic oxidant solution is 3:2:0 to 8:1:1.

### Claim 4 (depends on 1)

The process of claim 1, further comprising:
feeding a first portion of a flocculant-adsorbent solution to the redox reactor.

### Claim 5 (depends on 4)

The process of claim 4, further comprising:
pumping a sludge from the clarifier to a sludge handling system; and
feeding a second portion of the flocculant-adsorbent solution to a sludge thickener of the sludge handling system.

### Claim 6 (depends on 5)

The process of claim 5, further comprising:
flowing a portion of the clarified water to a dirty backwash water sump;
flowing a portion of a filtered water to the dirty backwash water sump; and
feeding a third portion of the flocculant-adsorbent solution to the dirty backwash water sump.

### Claim 7 (depends on 6)

The process of claim 6, wherein a volume ratio of the first portion to the second portion to the third portion of the flocculant-adsorbent solution is 8:1:1.

### Claim 8 (depends on 1)

The process of claim 1, further comprising:
analyzing a first concentration of a contaminant in the contaminated water; and
analyzing a second concentration of the contaminant in the treated water,
wherein the first concentration is greater than the second concentration.

### Claim 9 (depends on 1)

The process of claim 1, wherein filtering at least a portion of the clarified water in the two-stage filtration system comprises:
filtering at least a portion of the clarified water in an advanced catalytic media filter to produce a filtered water; and
filtering at least a portion of the filtered water in a catalytic carbon filter to produce the treated water.