	US 12,240,776 B2
	Integrated boron removal and flocculation process for treating fracturing wastewater
Tao Yu, Shaanxi (CN); Chengtun Qu, Shaanxi (CN); Jinling Li, Shaanxi (CN); Bo Yang, Shaanxi (CN); Xiaofei Zhang, Shaanxi (CN); Zhen Luo, Shaanxi (CN); and Rongrong He, Shaanxi (CN)
Assigned to XI'AN SHIYOU UNIVERSITY, Shaanxi (CN); and CHINA NATIONAL PETROLEUM CORPORATION SAFETY AND ENVIRONMENTAL RESEARCH INSTITUTE CO., LTD, Beijing (CN)
Appl. No. 17/616,443
Filed by XI'AN SHIYOU UNIVERSITY, Shaanxi (CN); and CHINA NATIONAL PETROLEUM CORPORATION SAFETY AND ENVIRONMENTAL TECHNOLOGY RESEARCH INSTITUTE CO., LTD., Beijing (CN)
PCT Filed Aug. 5, 2020, PCT No. PCT/CN2020/107113 § 371(c)(1), (2) Date Dec. 3, 2021, PCT Pub. No. WO2021/027654, PCT Pub. Date Feb. 18, 2021.
Claims priority of application No. 201910747901.X (CN), filed on Aug. 14, 2019.
Prior Publication US 2022/0227650 A1, Jul. 21, 2022
Int. Cl. C02F 9/00 (2023.01); C02F 1/00 (2023.01); C02F 1/52 (2023.01); C02F 1/66 (2023.01); C02F 1/72 (2023.01); C02F 1/76 (2023.01); C02F 101/10 (2006.01); C02F 101/30 (2006.01); C02F 103/10 (2006.01); C02F 103/36 (2006.01)

CPC C02F 9/00 (2013.01) [C02F 1/004 (2013.01); C02F 1/5236 (2013.01); C02F 1/66 (2013.01); C02F 1/722 (2013.01); C02F 1/76 (2013.01); C02F 2101/108 (2013.01); C02F 2101/30 (2013.01); C02F 2103/10 (2013.01); C02F 2103/365 (2013.01); C02F 2209/06 (2013.01); C02F 2209/44 (2013.01); C02F 2305/023 (2013.01)]

5 Claims

1. An integrated boron removal and flocculation process for treating fracturing wastewater, comprising steps of:

adjusting a pH level of the fracturing wastewater to be treated with an alkali to a range of 8.5 to 10.0, wherein the fracturing wastewater to be treated has a boron content of 100 to 200 mg/L;

adding an oxidant to the wastewater after pH adjustment to carry out a reaction at room temperature for 30 to 120 minutes, wherein the oxidant is a 25 to 30 wt. % aqueous hydrogen peroxide solution or a 12 to 15 wt. % aqueous sodium hypochlorite solution and the volume of the oxidant used is 0.15 to 0.5% of the fracturing wastewater to be treated;

adding a barium salt to the reaction mixture resulting from the reaction to carry out a further reaction at room temperature for 30 to 120 minutes, wherein the ratio of the barium salt used to the fracturing wastewater to be treated is 100-150 mg:1 L; and

allowing the reaction mixture resulting from the preceding step to stand still and settle for 20 to 40 minutes before filtration via a filtration unit.