Experimental Study on the Application of Humidification-Dehumidification Technology in the Desalination of High- Salt Industrial Wastewater

Abstract:

Thirty-four different water samples of high-salt industrial wastewater were desalinated by humidification-dehumidification and evaporation experiments. Based on the experimental results， the feasibility study of the universal application of the humidification-dehumidification technology in actual industry is conducted. Combining with the water quality characteristics and treatment effects of different high-salt industrial wastewater， the general rule for judging the effect of this method on the treatment of high-salt industrial wastewater is summarized. The results show that the conductivity drop percentage η_σ of the condensate of all wastewater in the experiment is above 80.0%， with the highest percentage of up to 99.9%. All the salinity of the condensate can reach the biochemical treatment standard， and the electrical conductivity of 32 condensates can be reduced to below 2 000 μS?cm^-1. In addition， via the humidification-dehumidification technology， salt substances with a higher boiling point than water have a complete removal effect， salt substances with a lower boiling point than water and a larger ionization constant have a better removal effect， and salt substances with a lower boiling point than water and a smaller constants have a poor removal effect.