Treatment method of wastewater containing heterocyclic organics and adsorbing material obtained therefrom

Patent metadata

Field	Value
Publication number	US-11760673-B2
Application number	US-201916424796-A
Country	US
Kind code	B2
Filing date	May 29, 2019
Priority date	May 31, 2018
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present disclosure relates to a treatment method of wastewater containing heterocyclic organics comprising the following steps: (1) adding a persulfate to the wastewater containing heterocyclic organics in a reaction vessel; (2) heating the reaction vessel to a reaction temperature in an inert atmosphere, then introducing an oxygen-containing gas until a reaction pressure is reached for reaction, and after the reaction is completed, cooling and filtering the reaction resultant to obtain a filtrate as a treated effluent and a filter residue; no catalyst is added to the reaction system. The treatment method provided by the present disclosure not only can significantly reduce the treatment temperature of the conventional wet oxidation, but also can control the amount of generated spherical polymer and the removal efficiency of organic pollutants by control of reaction conditions. Wastewater purification and organics recovery and reuse are achieved at the same time.

First claim

What is claimed is:

1. A treatment method of wastewater containing heterocyclic organics, wherein the treatment method comprises the following steps:
(1) adding a persulfate to the wastewater containing the heterocyclic organics in a reaction vessel;
(2) heating the reaction vessel to a reaction temperature in an inert atmosphere, then introducing an oxygen-containing gas until a reaction pressure is reached for reaction, and after the reaction is completed, cooling and filtering a resultant of the reaction to obtain a filtrate as a treated effluent and a filter residue as a polymer; and
no catalyst is added to a system of the reaction;

wherein the wastewater containing the heterocyclic organics has a COD of 2×10 3 mg/L-1×10 5 mg/L;
wherein in the wastewater containing the heterocyclic organics, a content of the heterocyclic organics is 1500 mg/L-7000 mg/L;
a COD removal rate of the treated effluent is calculated to be 95%;
(3) calcining the filter residue of the step (2) in the inert atmosphere to obtain an adsorbing material;

wherein a calcination temperature is 900-1200° C.;
wherein the adsorbing material has a hollow spherical structure, the adsorbing material has an external diameter size distribution of 0.5-10 μm and the adsorbing material has a wall thickness size distribution of 50-200 nm.

2. The treatment method according to claim 1 , wherein the heterocyclic organics include an aliphatic heterocyclic compound containing hetero atoms and an aromatic heterocyclic compound containing hetero atoms, and the hetero atoms include any one selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom and a combination of at least two selected therefrom.

3. The treatment method according to claim 1 , wherein the persulfate of the step (1) comprises any one selected from the group consisting of potassium persulfate, sodium persulfate, ammonium persulfate, potassium monopersulfate, sodium monopersulfate, ammonium monopersulfate, and a combination of at least two selected therefrom.

4. The treatment method according to claim 1 , wherein for 1 L of the wastewater, the persulfate is added in the step (1) in a weight of 0.5-5.0 times the chemical oxygen demand (COD) in the wastewater.

5. The treatment method according to claim 1 , wherein the reaction in the step (2) is performed at a temperature of 60-320° C.

6. The treatment method according to claim 1 , wherein the reaction in the step (2) is performed at an oxygen partial pressure of 0.1-8.0 MPa.

7. The treatment method according to claim 1 , wherein the reaction in the step (2) is performed for a time of 0.5-5 h.

8. The treatment method according to claim 1 , wherein the oxygen-containing gas in the step (2) comprises any one selected from the group consisting of air, oxygen, an industrial waste gas containing oxygen, and a combination of at least two selected therefrom.

9. The treatment method according to claim 1 , wherein the reaction in the step (2) is assisted by agitation.

10. The treatment method according to claim 9 , wherein a rate of the agitation is 10-1000 rpm.

11. The treatment method according to claim 1 , wherein the treatment method further comprises the following steps:
(4) immersing the adsorbing material obtained in the step (3) in an organic wastewater to adsorb and remove pollutants therein.

12. The treatment method according to claim 11 , wherein the organic wastewater of the step (4) is the same as or different from the wastewater containing the heterocyclic organics of the step (1).

13. The treatment method according to claim 11 , wherein the adsorbing material is added for treating the organic wastewater with a dosage of 0.5-10 g/L in the organic wastewater.

14. The treatment method according to claim 1 , wherein the calcination time is 2-4 h.

Assignees

• Inst Process Eng Cas

Inventors

• Cao Hongbin
• Xie Yongbing
• Zhou Linbi
• Shi Yanchun

Classifications

• B01J20/26 Primary

  Synthetic macromolecular compounds · CPC title

• B01J20/3078 Primary

  Thermal treatment, e.g. calcining or pyrolizing · CPC title

• C02F9/00 Primary

  Multistage treatment of water, waste water or sewage · CPC title

• C02F1/72

  by oxidation {(C02F1/4672 takes precedence)} · CPC title

• C02F1/725

  by catalytic oxidation · CPC title