The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 31, 2023
Filed:
Feb. 06, 2022
Tiangong University, Tianjin, CN;
Zhejiang Jinmo Environmental Technology Co., Ltd, Zhejiang, CN;
Haitao Wang, Tianjin, CN;
Na Chang, Tianjin, CN;
Yan Wang, Tianjin, CN;
Yinong Xu, Zhejiang, CN;
Qiliang Wang, Zhejiang, CN;
Rui Liu, Zhejiang, CN;
Tieying Jin, Zhejiang, CN;
Ruhan A, Zhejiang, CN;
Hao Zhang, Tianjin, CN;
Wei Shao, Tianjin, CN;
Yanjun Jia, Tianjin, CN;
Tiangong University, Tianjin, CN;
Zhejiang Jinmo Environmental Technology Co., Ltd, Zhejiang, CN;
Abstract
The present application relates to a preparation method for recycling inorganic salt in printing and dyeing wastewater and comprises the following process steps: S1, performing impurity removal, softening, COD removal and decoloration on reverse osmosis (RO) membrane concentrated water to obtain pretreated wastewater; S2, performing two-stage electrodialysis on the wastewater obtained in step S1: returning fresh water obtained in a first-stage electrodialysis desalination chamber to a front end of the RO process, and taking saline water obtained in a concentration chamber as raw water of a second-stage electrodialysis desalination chamber and a second-stage electrodialysis concentration chamber; and returning the fresh water obtained by the second-stage electrodialysis desalination chamber to the first-stage electrodialysis concentration chamber; and S3, dealkalizing the concentrated saline water obtained in the step S2 and then adjusting the pH value to obtain concentrated saline water capable of being reused for cloth dyeing in a printing and dyeing mill.