Simultaneous removal of fluoride and arsenic in geothermal water in Tibet using modified yak dung biochar as an adsorbent.

ABSTRACT: Fluoride (F) and arsenic (As) are two typical and harmful elements that are found in high concentrations in geothermal water in Tibet. In this work, yak dung, an abundant source of biomass energy in Tibet, was made into biochars (BC1, BC2 and BC3) by pyrolysis under different conditions, and the better biochar was modified by FeCl₂ (Fe-BC3). The adsorption conditions were optimized to adsorb F and As in geothermal water. The results showed that BC3 can remove 90% F^- and 20% As(V), which is the best effect of the three initial biochars. Fe-BC3 could remove 94% F^- and 99.45% As(V) under the same conditions as BC3, which was an adsorbent dosage 10 g l^-1, pH 5-6 and temperature of 25°C. It was also demonstrated that the removal rate did not decrease

SUBMITTER: Chunhui L 

PROVIDER: S-EPMC6281945 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature