Shandong Science ›› 2023, Vol. 36 ›› Issue (6): 121-130.doi: 10.3976/j.issn.1002-4026.2023.06.015

• Environment and Ecology • Previous Articles    

Research progress in high-salinity wastewater treatment by the freeze concentration method

WANG Xiaokai(), ZHAO Changsheng(), LI Luzhen, ZHANG Bowei, LIU Xuzhen, TAN Yu   

  1. Shandong Analysis and Testing Center,Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
  • Received:2023-04-18 Online:2023-12-20 Published:2023-12-07

Abstract:

The industrial production process produces large quantities of high-salinity wastewater comprising complex water-quality components, including a large amount of Na+, Cl-, SO42-, and other salts as well as toxic substances. Traditional high-salinity wastewater treatment technology has low efficiency and high operating cost. The freeze concentration method for high-salinity wastewater treatment has received widespread attention as a highly efficient and clean treatment technology without secondary pollution. However, the problem of impurities in the ice crystals prepared via freeze concentration should be solved urgently. This article summarizes the research progress of freeze concentration technology in high-salinity wastewater treatment in recent years. The key parameters such as freezing time, freezing temperature, and initial solution concentration were discussed, and various methods for removing impurities from ice crystals, including immersion, gravity, and water addition purification methods, were investigated. To accelerate the desalination process and improve the desalination effect, nucleating agent and ultrasonic-assisted freeze concentration methods were investigated. Furthermore, the energy consumption of the freeze concentration technology was economically analyzed. Moreover, the development of the technology is summarized and a prospect is proposed to provide specific references for the development and application of freeze concentration method in high-salinity wastewater treatment.

Key words: freeze concentration, high-salinity wastewater, ice purification, assistant method, economic analysis

CLC Number: 

  • X-1