# US 2013/0153509 A1 · Wastewater treatment comprising electrodissolution, flocculation and oxidation

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- Number: US 2013/0153509 A1
- Document ID: US20130153509A1
- Status: Published application
- Kind: A1
- Application number: 13/703,796
- Filed: 2011-06-15
- Published: 2013-06-20
- Earliest claimed: 2010-06-16
- Inventors: Fiderman Machuca Martinez; Nilson de Jesus Marriaga Cabrales; Charles Eduardo Cardona Palomino
- Web page: https://patentgrep.com/patent/US20130153509A1

## CPC

- C02F 9/00: Multistage treatment of water, waste water or sewage
- C02F 1/463: by electrocoagulation
- C02F 1/5245: {using basic salts, e.g. of aluminium and iron}
- C02F 1/66: by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58)
- C02F 1/722: {Oxidation by peroxides}
- C02F 2103/325: {from processes relating to the production of wine products}
- C02F 2201/4617: DC only
- 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

The present invention claims a process to reduce COD, TOC, and total solids from a contaminated liquid medium, which comprises of the following stages: feed an electrolytic cell provided with electrodes with the contaminated liquid medium; apply a constant direct current through said electrodes; flocculate the solids present in said contaminated liquid medium by adding coadjuvant agents, remove sludge and supernatant obtained; and oxidize the supernatant through oxidizing agents.

## Claims

### Claim 1

A process to reduce COD, TOC, and total solids from a contaminated liquid medium, which comprises the following stages:
a) Feed an electrolytic cell provided with electrodes with the contaminated liquid medium;
b) Apply a constant direct current through said electrodes;
c) Flocculate the solids present in said contaminated liquid medium by adding coadjuvant agents.
d) Remove the sludge supernatant obtained;
e) Oxidize the supernatant through oxidizing agents.

### Claim 2 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, where, additionally, the supernatant produced in step e) is reused as of step c).

### Claim 3 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, characterized because the electrodes from step a) are manufactured from a material selected from the group that comprises iron, steel to carbon, aluminum, and a combination of them.

### Claim 4 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, where the operation pH in the electrochemical reactor is between 4 and 5.

### Claim 5 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, where the load in the electrochemical reactor is between 5,000 and 10,000 Coulombs per liter, and it is applied through direct current.

### Claim 6 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, where the density of the direct current is between 0.3 and 2.0 mA/cm2.

### Claim 7 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, where the oxidizing agent from stage e) is hydrogen peroxide.

### Claim 8 (depends on 7)

The process to reduce COD, TOC, and total solids pursuant to claim 7, characterized because in stage (e), the concentration of hydrogen peroxide injected to said contaminated liquid medium is between 20 to 5,000 ppm.

### Claim 9 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, characterized because the organic part of the sludge obtained in step c) can be employed to manufacture fuels.

### Claim 10 (depends on 1)

The process to reduce COD, TOC, and total solids pursuant to claim 1, characterized because the inorganic and organic parts of the sludge obtained in step c) are matter used in the manufacture of agro-fertilizers.