Bioaugmentation treatment process for lithium battery producing wastewater

Patent metadata

Field	Value
Publication number	US-12246977-B2
Application number	US-202217883032-A
Country	US
Kind code	B2
Filing date	Aug 8, 2022
Priority date	Jul 23, 2020
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

The present invention relates to the technical field of wastewater treatment, and discloses a bioaugmentation treatment process for lithium battery producing wastewater. The method comprises the following steps: 1) introducing wastewater into a hydrolytic acidification tank, and adding Enterobacter sp. NJUST50 and activated sludge to the hydrolytic acidification tank for hydrolytic acidification treatment; 2) introducing the effluent into an anoxic tank, and adding Enterobacter sp. NJUST50 and anaerobic activated sludge for anoxic treatment; 3) introducing the effluent into an aerobic tank, and adding Enterobacter sp. NJUST50 and aerobic activated sludge for aerobic treatment; 4) introducing the effluent into an anoxic filter tank, and adding Enterobacter sp. NJUST50 and anaerobic activated sludge to the filter tank for treatment; and 5) introducing the effluent into a biological aerated filter tank, and adding a sludge mixture of Enterobacter sp. NJUST50 with aerobic activated sludge to the filter tank for treatment.

First claim

What is claimed is:

1. A bioaugmentation treatment process for lithium battery producing wastewater, comprising the following steps:
1) introducing lithium battery producing wastewater into a hydrolytic acidification tank, and adding a sludge mixture of Enterobacter sp. NJUST50 and anaerobic activated sludge to the hydrolytic acidification tank for hydrolytic acidification treatment, wherein the Enterobacter sp. NJUST50 is deposited in China Center for Type Culture Collection under CCTCC Accession NO: M2019128;
2) introducing the wastewater after treatment in step 1) into an anoxic tank, and adding a sludge mixture of the Enterobacter sp. NJUST50 with anaerobic activated sludge to the tank for anoxic treatment;
3) introducing the wastewater after treatment in step 2) into an aerobic tank, and adding a sludge mixture of the Enterobacter sp. NJUST50 and aerobic activated sludge to the tank for aerobic treatment;
4) introducing the wastewater after treatment in step 3) into an anoxic filter tank, and adding a sludge mixture of the Enterobacter sp. NJUST50 with anaerobic activated sludge to the filter tank for anoxic treatment; and
5) introducing the wastewater after treatment in step 4) into a biological aerated filter tank, and adding a sludge mixture of the Enterobacter sp. NJUST50 with aerobic activated sludge to the filter tank for aerobic treatment.

2. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 1 , further comprising step 6) that is specifically:
6) entering an effluent after treatment in step 5) into a membrane bioreactor for solid-liquid separation treatment.

3. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 2 , wherein the mixing ratio of the Enterobacter sp. NJUST50 and the anaerobic activated sludge in steps 1), 2) and 4) is 1:5 on basis of dry weight of the sludge, and/or the mixing ratio of the Enterobacter sp. NJUST50 and the aerobic activated sludge in steps 3) and 5) is 1:5 on basis of dry weight of the sludge.

4. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 2 , wherein the lithium battery producing wastewater in step 1) has been pretreated by sedimentation-coagulation-precipitation.

5. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 1 wherein the mixing ratio of the Enterobacter sp. NJUST50 and the anaerobic activated sludge in steps 1), 2) and 4) is 1:5 on basis of dry weight of the sludge, and/or the mixing ratio of the Enterobacter sp. NJUST50 and the aerobic activated sludge in steps 3) and 5) is 1:5 on basis of dry weight of the sludge.

6. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 5 , wherein the hydraulic retention time in the hydrolytic acidification tank in step 1) is set as 16-24 hrs, and an organic load is 3.50-5.30 kgCOD/m 3 /d; and/or the hydraulic retention time in the anoxic tank in step 2) is set as 48-72 hrs, and an organic load is 0.23-0.35 kgCOD/m 3 /d; and/or the hydraulic retention time in the aerobic tank in step 3) is set as 48-72 hrs, and an organic load is 0.07-0.11 kgCOD/m 3 /d; and/or the hydraulic retention time in the anoxic filter tank in step 4) is set as 16-24 hrs, and an organic load is 0.34-0.51 kgCOD/m 3 /d; and/or the hydraulic retention time in the biological aerated filter tank in step 5) is set as 8-10 hrs, and an organic load is 0.14-0.17 kgCOD/m 3 /d.

7. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 6 , wherein the sludge mixture inoculated in the hydrolytic acidification tank in step 1) is 5 kg/m 3 ; and/or the sludge mixture inoculated in the anoxic tank in step 2) is 5 kg/m 3 ; and/or the sludge mixture inoculated in the aerobic tank in step 3) is 3 kg/m 3 ; and/or the sludge mixture inoculated in the anoxic filter tank in step 4) is 1 kg/m 3 ; and/or the sludge mixture inoculated in the biological aerated filter tank in step 5) is 1 kg/m 3 .

8. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 1 , wherein the lithium battery producing wastewater in step 1) has been pretreated by sedimentation-coagulation-precipitation.

9. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 8 , wherein in the anoxic tank, a diluted sulfuric acid solution is required to be added to adjust the pH to 6.5-7.0, and in the aerobic tank, a sodium hydroxide solution needs to be added to adjust the pH to 7.5-8.0.

10. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 9 , wherein ZVI is added into the anoxic tank, and the amount of ZVI is 6 kg/m 3 .

11. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 10 , wherein glucose is added in the anoxic filter tank, and the amount of glucose is 0.2 kg/m 3 .

12. The bioaugmentation treatment process for lithium battery producing wastewater according to claim 10 , wherein an effluent after treatment in step 3) is refluxed to the anoxic tank in step 2), and an effluent after treatment in step 5) is refluxed to the anoxic filter tank in step 4).

Assignees

• Univ Nanjing Sci & Tech
• Zhenrun Environmental Science And Tech Co Ltd

Inventors

• Shen Jinyou
• Zhang Hebing
• Wang Jing
• He Junfeng
• Jiang Xinbai
• Wang Hong
• Hou Cheng
• Liu Xiaodong

Classifications

• C02F2301/08

  Multistage treatments, e.g. repetition of the same process step under different conditions · CPC title

• Y02W10/10

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

• C02F2303/20

  Prevention of biofouling · CPC title

• C02F2101/34

  containing oxygen · CPC title

• C02F2101/16

  Nitrogen compounds, e.g. ammonia · CPC title