用微生物外红硫螺菌属形成的生物聚合物去除废水中的重金属

Using the Biopolymer of Microorganism Ectothiorhodospira Shaposhnikovii to Remove of Heavy Metals from Waste Waters

光能异养微生物外红硫螺菌属Ｓｈａｐｏｓｈｎｉｋｏｖｉ形成的胞外生物聚合物对重金属具有很强的吸附力。吸附作用与液体的ｐＨ值有关，最佳的ｐＨ值范围是６～７．在铜、锌离子浓度为１００ｍｇ／ｌ的水溶液中，两种离子的去除率达到９９．７％，水溶液中剩余的离子浓度小于０．３ｍｇ／ｌ．生物聚合物中被吸附的重金属占生物干重的２５％～３０％．

The photoheterotrophic microorganism Ectothiorhodospired Shaposhnikovii may produce an extracellular biopolymer having and the a big sorptive power against heavy metals.The sorption of metals depends on the pH value,and the optimum value is ranged from 6～7.In aqueous solution with a concentration of metal ions 100 mg/l,it was were achieved that more than 99 7% amount of copper and zinc was removed.The residue concentrations is less than 0 3 mg/l in the aqueous phases.The sorbed metal of the biopolymer were 25%～30% in the dry mass.