화학공학소재연구정보센터
Inzynieria Chemiczna i Procesowa, Vol.22, No.2, 311-322, 2001
Water purification by membrane distillation
Water purification by membrane distillation (MD) has been studied. The experiments were carried out by using ground water or tap water as the feed. A rapid flux decline was observed during the operation of the MD process. Basing on the experiments it was found that CaCO3 was the main foulant of the membrane surface. The initial permeability of the membrane can be restored by cleaning the membrane surface using 2% HCl solution. The thermal pre-treatment of raw water followed by filtration permits to eliminate the foulant from the feed in the form of deposit before MD process. There was not noticeable flux decline for the feed pretreated with pH adjustment to 4 by addition of HCl, during the MD process. The conductivity of the water purified with MD was with the range of 1-5 muS/cm and TDS did not exceed 2.1 ppm.