Experimental study of high salinity water treatment by humidification-dehumidification technology
Qing-teng FU(),Fei GUO,Xiao-hua LIU*()
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
A small-scale desalination system was presented based on the humidification-dehumidification (HDH) principle, aiming at the further treatment and concentration problem of high salinity water. The multi-faceted hollow balls were used as the packing to expand the gas-liquid contact areas in the humidifier and enhance the heat and mass transfer process. The mass fraction of salt and the volume flow of the feedliquid were changed in this experimental system, and then the water productivity per unit time was measured and the gained output ratio, the specific thermal energy consumption and the salt rejection ratio were calculated. The spreading characteristics of saline droplet impacting on polypropylene plate surface were recorded with a high-speed camera, and the effect of the mass fraction of salt on the HDH desalination system was further analyzed. Results indicated that with the increase of the mass fraction of salt, the water productivity per unit time decreased significantly, the specific thermal energy consumption increased significantly, the quality of the pure water was not reduced, and the salt rejection ratios maintained above 99.9%. For saturated brine, the increase of volume flow increased the water productivity per unit time, and had little effect on the gained output ratio and the specific thermal energy consumption. This study broadens the application field of the HDH technology. A reference for the treatment and concentration of high salinity water with HDH process was proposed.
Qing-teng FU,Fei GUO,Xiao-hua LIU. Experimental study of high salinity water treatment by humidification-dehumidification technology. Journal of ZheJiang University (Engineering Science), 2019, 53(11): 2231-2237.
Fig.2Photograph of experimental setup of HDH desalination system
Fig.3Variation of water productivity per unit time with time
Fig.4Variation of water productivity per unit time and salt rejection ratio with mass fraction of salt
Fig.5Variation of liquid film spreading area with time
Fig.6Maximum spreading diameters of salty droplet impacting polypropylene flat surface
Fig.7Variation of GOR and STEC with mass fractiion of salt
Fig.8Variation of water productivity per unit time and salt rejection ratio with volume flow of feedliquid
Fig.9Variation of GOR and STEC with volume flow of feedliquid
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