Acidic Wastewater of the Flue Gas Absorbed by Crystal Membrane Distillation

Abstract

The effect of neutralizing acidic waste water of the flue gas absorbed by using crude calcium carbonate and treatment of it by using crystal membrane distillation was studied. Effect of some factors, such as the temperature, the original concentration, the velocity of flow and the pH of feed solution, on the process of the membrane distillation and crystallization was observed. The results showed that CaCl2 crystal in the concentrated feed solution began to appear after 18 h running in the condition of the temperature 50 °C, the velocity of flow 18.5 mL/min, the pH of feed solution 7, and resulted in the desired crystal. The separation efficiency was close to 100%.