Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (7): 20250039.doi: 10.7503/cjcu20250039

• Environmental Chemistry • Previous Articles     Next Articles

Recycling Treatment of Unsymmetrical Dimethylhydrazine High-salinity Wastewater via "Electrodialysis+Reverse Osmosis" Double Membrane Processes

XUE Linyong1, ZHU Helin2, ZHANG Nian1, WU Yannan1, YANG Zhenmiao1, WEI Chenjie1(), LIU Lifen1()   

  1. 1.College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China
    2.Kaiyuan Environmental Technology Group Co. ,Ltd. ,Hangzhou 311200,China
  • Received:2025-02-14 Online:2025-07-10 Published:2025-04-21
  • Contact: LIU Lifen E-mail:cjwei@zjut.edu.cn;lifenliu@zjut.edu.cn
  • Supported by:
    the Natural Science Foundation Joint Key Project of Zhejiang Province, China(LHZ22E080004);the "Jianbing-Lingyan+X" Science and Technology Program of Zhejiang Province, China(2025C02241)

Abstract:

Unsymmetrical dimethylhydrazine(UDMH) is the main fuel for missile, satellite and spacecraft launch tests as well as carrier rockets. Its production wastewater contains high concentrations of salt, alkali and UDMH. Direct discharge of the UDMH wastewater can cause water and soil pollution, seriously endangering human health. Therefore, this paper designed a kind of “electrodialysis+reverse osmosis” double membrane processes for recycling treatment of the high salinity UDMH wastewater. Firstly, the electrodialysis(ED) was used to remove the impunities of salt and base in the wastewater, and then the reverse osmosis(RO) was carried out to further concentrate the desalinated wastewater for the highly purified recovery of UDMH. Meanwhile, the influences of ion exchange membrane, operating voltage and feed liquid flow rate on desalination process of ED were investigated, and the concentration technique of reverse osmosis process was also optimized. The research results showed that the electrodialysis process can remove 98.6% of NaCl and base(NaOH, ect.), the loss rate of UDMH is less than 13.5%, the current efficiency can reach 53.1%, and the process energy consumption is about 1.02 kW·h/kg. The concentration of UDMH is concentrated from 1.1 g/L to 6.3 g/L, and the concentration ratio of UDMH is about 5.6 times, which meets the reuse requirement of UDMH.

Key words: High-salinity unsymmetrical dimethyl hydrazine wastewater, “Electrodialysis+reverse osmosis” double membrane process, Recycling treatment, Highly purified recovery of unsymmetrical dimethylhydrazine(UDMH)

CLC Number: 

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