Study on removal of iron,manganese and sulfate ions from acid mine drainage by biomass chelation
Using chitosan(CS)and sodium alginate(SA)as raw materials and calcium chloride as a crosslinking agent,two kinds of gel microspheres,SA and CS/SA,were prepared through an emulsification cross-linking method.The adsorption properties of SA gel microspheres,CS/SA gel microspheres,chi-tosan,and sodium alginate were compared for removing iron,manganese,and sulfate ions from acid mine drainage(AMD).The results showed that when the reaction temperature was 25 ℃,the stirring time was 6 h,and the dosage was 12.5 g/L,chitosan had the best removal effect on the ions in AMD,with removal ratios of 100％,21.73％and 88.88％for iron,manganese,and sulfate ions,respectively.SA Gel micro-spheres followed with removal ratios of 80.57％,9.03％and 21.68％.SA Had the lowest removal ratios,with 62.1％,6.38％and 17.11％for the above three ions.CS/SA Gel microspheres with 39.75％,4.86％and 57.94％.When CS/SA gel microspheres were prepared into aerogel,the removal ratios of iron ions were greatly improved when the dosage was 5 g/L,the removal rate reached 97.9％,and the removal ratios of manganese and sulfate ions were little improved,with the removal ratios of 5.07％and 50.57％,respectively.
NETL
NSTL
万方数据
