Activating agent for treatment of radioactive wastewater and method using the same for radioactive wastewater treatment

Patent metadata

Field	Value
Publication number	US-10315938-B2
Application number	US-201615264580-A
Country	US
Kind code	B2
Filing date	Sep 13, 2016
Priority date	May 26, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

An activating agent for the treatment of radioactive wastewater. The activating agent is prepared by dissolving a mixture of inorganic salts including Ca 2+ , Na + , Sr 2+ , Zn 2+ , Mg 2+ , Fe 2+ and K + in pure water having an electrical resistivity greater than 0.5 MΩ·cm to yield a solution. A method of radioactive wastewater treatment using the activating agent includes: 1) preparing the activating agent; 2) adding the activating agent to radioactive wastewater having an electrical resistivity greater than 0.5 MΩ·cm; uniformly mixing the activating agent and the radioactive wastewater; 3) further treating the radioactive wastewater including the activating agent using an electro-deionization device; and 4) collecting two liquid flows obtained in 3), one being purified water, the other being concentrated water returning to 2) for further purification.

First claim

The invention claimed is:

1. An activating agent for treating wastewater comprising radioactive substances, the activating agent being prepared by dissolving inorganic salts comprising Ca 2+ , Na + , Sr 2+ , Zn 2+ , Mg 2+ , Fe 2+ , and K + in pure water having an electrical resistivity greater than 0.5 MΩ·cm, wherein the concentrations of the Ca 2+ , Na + , Sr 2+ , Zn 2+ , Mg 2+ , Fe 2+ , and K + in the activating agent are as follows:
Ca 2+ : 0.01-1 g/L;
Na + : 0.02-1.5 g/L;
Sr 2+ : 0.8-45 mg/L;
Zn 2+ : 1.8-100 mg/L;
Mg 2+ : 0.02-1.25 g/L;
Fe 2+ : 4-250 mg/L; and
K + : 10-750 mg/L.

Assignees

• Univ Tsinghua

Inventors

• Li Fuzhi
• Zhao Xuan
• Zhang Meng

Classifications

• B01D2311/12

  Addition of chemical agents · CPC title

• B01D61/025

  Reverse osmosis; Hyperfiltration · CPC title

• C02F2305/00

  Use of specific compounds during water treatment · CPC title

• B01D61/52

  Accessories; Auxiliary operation · CPC title

• B01D61/42

  Electrodialysis; Electro-osmosis {; Electro-ultrafiltration; Membrane capacitive deionization} · CPC title