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Study on the operational performance for low-temperature high-salt wastewater desalination by the air-bubbling method
Yuchi Liu1, Zhigen Wu1,2, Xingjuan Yu1,3
1State Key Laboratory of Water Pollution Control and Green Resource Recycling, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
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In this study, an air-bubbling humidifier, a dehumidifier (also referred to as an open-air HD system) and a closed-air HD system for desalting high-salt wastewater were designed and constructed. Experimental tests and analyses of these desalination systems were conducted under different operating parameters. The results showed that for the closed-air HD system, the recommended evaporation temperature and the condensate solution temperature are 50-80 and 20-40 °C, respectively. The system achieved a maximum energy recovery rate of 24.55% and a minimum specific vapor consumption ratio (SVCR) of 0.756. In addition, the air-bubbling closed-air HD system was proven effective in treating high-salt wastewater, with the electrical conductivity of the condensate solution reaching a maximum of 670.22 μS/cm. This study demonstrates that the air-bubbling HD system has great potential for high-salt wastewater treatment without requiring an indirect contact heat exchanger.
