Destabilization and separation of high stable colloids

Patent metadata

Field	Value
Publication number	US-11136249-B1
Application number	US-202016883484-A
Country	US
Kind code	B1
Filing date	May 26, 2020
Priority date	May 26, 2020
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

Provided herein are compositions and methods useful for the treatment of wastewater comprising colloidal impurities. In certain aspects and embodiments, the compositions and methods include a natural deep eutectic solvent (NADES) coagulant including a hydrogen bond acceptor and a hydrogen bond donor, wherein the NADES is a liquid at room temperature.

First claim

What is claimed:

1. A method for removal of suspended colloidal particles from wastewater effluents comprising treating the wastewater with a green natural deep eutectic solvent (NADES) coagulant comprising a hydrogen bond acceptor and a hydrogen bond donor; stirring the treated wastewater; settling the treated wastewater; and extracting the supernatant.

2. The method of claim 1 , wherein the suspended colloidal particles comprise bentonite, kaolinite, barite, and precipitated calcium carbonate.

3. The method of claim 1 , wherein the turbidity of the treated wastewater is 5 NTU or less zero as measured by a turbidity meter.

4. The method of claim 3 , wherein the turbidity is 0.653 NTU or below.

5. The method of claim 1 , wherein the resulting settled sediment comprises flocs with a diameter (D 50 ) of 36 μm, as measured by a floc size measuring device.

6. The method of claim 5 , wherein the coagulant is added at a dose where the treated wastewater turbidity is 5 NTU or less.

7. The method of claim 6 , wherein the method further comprises aggregating via an electrostatic patch coagulation mechanism.

8. The method of claim 1 , wherein the treated wastewater has a zeta potential of −18 mV, as measured by a zeta potential measuring device.

9. The method of claim 1 , wherein the hydrogen bond acceptor is choline chloride.

10. The method of claim 9 , wherein the hydrogen bond donor is selected from the group consisting of lactic acid, malic acid, citric acid, acetic acid, phenylacetic acid, trifluoroacetic acid, and trichloroacetic acid.

11. The method of claim 10 , wherein the hydrogen bond donor is acetic acid.

12. The method of claim 10 , wherein the molar ratio of choline chloride to the hydrogen bond donor is 1:1.

13. The method of claim 1 , wherein the wastewater is stirred at a speed of 180 rpm for thirty seconds.

14. The method of claim 1 , wherein the wastewater is stirred at a speed of 50 rpm for 20 minutes.

15. The method of claim 1 , wherein the treated wastewater has a 100% total suspended solids (TSS) removal at a range of high pH from 3 to 9.

16. The method of claim 1 , wherein the treated wastewater was settled for two minutes.

17. The method of claim 1 , wherein the wastewater has a pH of 9.

18. The method of claim 1 , wherein the wastewater is selected from the group consisting of oil and gas processing effluent, pulp and paper processing effluent, mineral processing effluent, tailing and tanning processing effluent, paint processing effluent, and ceramic processing effluent.

Assignees

• Univ Qatar

Inventors

• Al-Risheq Dana Izzat
• Nasser Mustafa
• Qiblawey Hazim
• Benamor Abdelbaki
• Hussein Ibnelwaleed Ali

Classifications

• C02F2103/365

  from petrochemical industry (e.g. refineries) · CPC title

• C02F2103/28

  from the paper or cellulose industry · CPC title

• C02F2103/24

  from tanneries · CPC title

• C02F2103/14

  Paint wastes · CPC title

• C02F2103/12

  from the silicate or ceramic industries, e.g. waste waters from cement or glass factories · CPC title