Process of removing aluminum waste in wastewater

Patent metadata

Field	Value
Publication number	US-2024279085-A1
Application number	US-202418435055-A
Country	US
Kind code	A1
Filing date	Feb 7, 2024
Priority date	Feb 9, 2023
Publication date	Aug 22, 2024
Grant date	—

Abstract

According to embodiments of the present disclosure, there is provided a process of removing aluminum waste from wastewater. The process includes (a) supplying, as a feed, wastewater containing aluminum; (b) separating the wastewater into a liquid component and a sludge component containing the aluminum; (c) reacting the sludge component with sulfuric acid to produce aluminum sulfate; (d) mixing the aluminum sulfate with alcohol to produce aluminum sulfate hydrate; and (e) adding the aluminum sulfate hydrate produced in step (d) to the wastewater of step (a) and/or to another wastewater. The process can cost-effectively remove waste from wastewater and reduce the content of waste contained in the effluent from being discharged.

First claim

What is claimed is:

1 . A process of removing aluminum waste from wastewater, the process comprising:
(a) supplying, as a feed, wastewater containing aluminum; (b) separating the wastewater into a liquid component and a sludge component containing the aluminum; (c) reacting the sludge component with sulfuric acid to produce aluminum sulfate; (d) mixing the aluminum sulfate with an alcohol to produce aluminum sulfate hydrate; and (e) adding the aluminum sulfate hydrate produced in step (d) to the wastewater of step (a) and/or to another wastewater.

2 . The process of claim 1 , wherein the wastewater in step (a) has an aluminum content of more than 15 wt %.

3 . The process of claim 1 , wherein the aluminum waste comprises boehmite (AlOOH).

4 . The process of claim 1 , step (b) comprises adding externally sourced aluminum sulfate hydrate to the wastewater.

5 . The process of claim 1 , wherein step (c) is performed with a sulfuric acid solution having a concentration of 1 M and at a temperature of 60° C. to 100° C. for 1 to 5 hours.

6 . The process of claim 5 , wherein the sludge component is added in an amount of 5 to 15 wt % based on the weight of the sulfuric acid solution.

7 . The process of claim 1 , wherein in step (d) the alcohol comprises ethanol, propanol, butanol, or a combination thereof.

8 . The process of claim 1 , wherein in step (d), the aluminum sulfate and the alcohol are mixed in a volume ratio of 1:2 to 1:5.

9 . The process of claim 1 , wherein in step (e), the aluminum sulfate hydrate is added in an amount of 10 to 300 ppm relative to the mass of the wastewater.

10 . The process of claim 1 , the another wastewater is in a separate wastewater treatment plant.

11 . The process of claim 3 , wherein step (c) includes mixing the sludge component reacts with the sulfuric acid according to the following Reaction Formula 1:

Assignees

• Sk Innovation Co Ltd

Inventors

• Song Jae Yang

Classifications

• C02F2101/10

  Inorganic compounds · CPC title

• C01F7/741

  Preparation from elemental aluminium or elemental aluminium containing materials, e.g. foil or dross · CPC title

• C02F1/38

  by centrifugal separation · CPC title

• C02F1/5236 Primary

  using inorganic agents · CPC title

• C02F1/58 Primary

  by removing specified dissolved compounds (using ion-exchange C02F1/42; softening water C02F5/00) · CPC title