	US 12,264,094 B2
	Method for chromium removal from post-tanning wastewater
Jianfei Zhou, Chengdu (CN); Liming Zhao, Jingmen (CN); Bi Shi, Chengdu (CN); and Yuling Tang, Chegndu (CN)
Assigned to SICHUAN UNIVERSITY, Chengdu (CN)
Filed by SICHUAN UNIVERSITY, Chengdu (CN)
Filed on May 7, 2022, as Appl. No. 17/739,079.
Application 17/739,079 is a continuation of application No. PCT/CN2021/109596, filed on Jul. 30, 2021.
Claims priority of application No. 202110262082.7 (CN), filed on Mar. 10, 2021.
Prior Publication US 2022/0289610 A1, Sep. 15, 2022
Int. Cl. C02F 9/00 (2023.01); C02F 1/52 (2023.01); C02F 1/66 (2023.01); C02F 1/68 (2023.01); C02F 101/22 (2006.01); C02F 101/30 (2006.01); C02F 103/24 (2006.01)

CPC C02F 9/00 (2013.01) [C02F 1/52 (2013.01); C02F 1/66 (2013.01); C02F 1/683 (2013.01); C02F 2101/22 (2013.01); C02F 2101/308 (2013.01); C02F 2103/24 (2013.01)]

16 Claims

1. A method for chromium removal from post-tanning wastewater, comprising the following steps:

(a) mixing pretreated post-tanning wastewater with an induction reagent comprising a soluble metal salt to allow an induction reaction, wherein based on metal ions in the soluble metal salt, a mass of the induction reagent is 0.01% to 0.1% of a mass of the pretreated post-tanning wastewater; and

(b) adjusting a pH of a material obtained after the induction reaction to higher than 7.0 for precipitation.