Boron rejection from aqueous solution and wastewater by direct contact membrane distillation

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Environmental Research and Technology
Volume:4 Issue:1
Boron rejection from aqueous solution and wastewater by direct contact membrane distillation

Boron rejection from aqueous solution and wastewater by direct contact membrane distillation

Authors : Burcu TAN, Uğur SELENGİL, Tijen Ennil BEKTAS

Pages : 73-82

Doi:10.35208/ert.842919

View : 47 | Download : 12

Publication Date : 2021-03-31

Article Type : Conference Paper

Abstract :Boron is widely used in various areas of modern technology. Due to the environmental problems arising during the production and use, the studies on the removal and recovery of boron from wastewater have been increased recently. Membrane distillation insert ignore into journalissuearticles values(MD); system is smaller in size with respect to other common distillation systems and needs lower operating temperatures. In addition, the equipment costs are reduced and the safety of the process increases since it operates at lower pressures. Moreover, the membrane distillation process can remove pollutants from water without using chemicals. In this study, boron rejection from aqueous solutions and wastewater was investigated by using direct contact membrane distillation insert ignore into journalissuearticles values(DCMD); system where both surfaces of a porous hydrophobic membrane were in contact with liquid streams. The effects of various parameters insert ignore into journalissuearticles values(pH, feed concentration, feed temperature, etc.); on boron rejection were investigated and the highest boron rejection was found to be 50 % when pH=10 at 50 °C and with feeding by a pump of 54 rpm. According to the test results of wastewater from Kırka Borax treatment plants, the mean distillate fluxes were found as 13, 16 and 14 L m -2 h -1 at the feed temperatures of 30, 40 and 50 °C, respectively. The boron removal percentages were found to be 47, 64 and 48 % at 30, 40 and 50 °C, respectively. It was observed in the XRD spectra that the crystals in wastewater mainly consist of Na 2 Binsert ignore into journalissuearticles values(OH); 4 Cl and Mg 2 B 2 O 5 structures.
Keywords : Boron, membrane distillation, recovery, rejection, wastewater

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