Title:
METHOD FOR TREATING CHROMIUM IN LEATHER-MANUFACTURING DYEING AND FINISHING WASTEWATER
Document Type and Number:
WIPO Patent Application WO/2022/188341
Kind Code:
A1
Abstract:
The present invention relates to the technical field of chromium-containing wastewater treatment, and in particular to a method for treating chromium in leather-manufacturing dyeing and finishing wastewater. The method for treating chromium in leather-manufacturing dyeing and finishing wastewater comprises the following steps: (a) mixing pretreated dyeing and finishing wastewater with an induction reagent to enable induction reaction; and (b) adjusting materials after the induction reaction to a basic pH to carry out precipitation treatment, the induction reagent comprising a soluble metal salt. In the treatment method of the present invention, pretreated dyeing and finishing wastewater is mixed with an induction reagent; under the action of the induction reagent, a small amount of neutral chromium complex remaining in the wastewater is converted into a positive chromium complex, and the charge properties of complexed chromium are changed; then the pH is adjusted to carry out precipitation to remove chromium, thereby greatly improving the effect of removing chromium from the wastewater.
Inventors:
ZHOU JIANFEI (CN)
ZHAO LIMING (CN)
SHI BI (CN)
TANG YULING (CN)
ZHAO LIMING (CN)
SHI BI (CN)
TANG YULING (CN)
Application Number:
PCT/CN2021/109596
Publication Date:
September 15, 2022
Filing Date:
July 30, 2021
Export Citation:
Assignee:
UNIV SICHUAN (CN)
International Classes:
C02F1/62; C02F101/22; C02F103/30
Foreign References:
| CN113044946A | 2021-06-29 | |||
| CN102505057A | 2012-06-20 | |||
| JPH04131186A | 1992-05-01 | |||
| CN101805052A | 2010-08-18 | |||
| CN109133408A | 2019-01-04 | |||
| US5000859A | 1991-03-19 |
Other References:
TANG YULING, ZHAO JIETING, ZHOU JIANFEI, ZENG YUNHANG, ZHANG WENHUA, SHI BI: "Highly efficient removal of Cr(III)-poly(acrylic acid) complex by coprecipitation with polyvalent metal ions: Performance, mechanism, and validation", WATER RESEARCH, vol. 178, 1 July 2020 (2020-07-01), AMSTERDAM, NL, pages 1 - 10, XP055965274, ISSN: 0043-1354, DOI: 10.1016/j.watres.2020.115807
Attorney, Agent or Firm:
CHENGDU CENTRAL ASIA PATENT AGENCY CO., LTD (CN)
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