优势植物对电解锰渣中Mn迁移的影响

Influence of dominant plants on the migration of Mn in electrolytic manganese residue

本研究对一电解锰渣堆场两种植物(五节芒、一年蓬)定植条件下的植株Mn含量、电解锰渣全Mn含量、电解锰渣有效态Mn含量和渗透水中Mn含量进行测定,计算富集系数,探讨植物定植对电解锰渣中Mn迁移的影响。结果表明,五节芒植株内Mn含量37.62 mg/kg,一年蓬植株内Mn含量98.30 mg/kg。五节芒定植后,电解锰渣有效态Mn含量下降了48.25%,一年蓬定植使电解锰渣有效态Mn含量下降了37.19%。此外,与对照相比,五节芒定植使渗透水中的Mn含量下降了65.64%~80.66%,一年蓬定植使渗透水中Mn含量下降了12.87%~19.48%。综上,两种植物定植均能减少电解锰渣中Mn向水体迁移,其中五节芒的阻控效果优于一年蓬,具有治理电解锰渣堆场Mn污染的潜力。

The Mn content in plant,substrate,residue and osmotic water were determined under the establishment conditions of two plants(Miscanthus floridulus and Erigeron annuus)in a electrolytic manganese residue storage site,and the bioaccumulation coefficient was calculated to investigate the effect of plant colonization on Mn migration in electrolytic manganese residue.The results showed that the content of Mn in M.floridulus was 37.62 mg/kg and E.annuus was 98.30 mg/kg.The content of available Mn in electrolytic manganese residue decreased by 48.25%after the establishment of M.floridulus,and the content of available Mn in electrolytic manganese residue decreased by 37.19%after the establishment of E.annuus.In addition,compared with the control,the Mn content in the osmotic water decreased by 65.64%-80.66%with the establishment of M.floridulus,and 12.87%-19.48%with the growth of E.annuus.In conclusion,the establishment of the two plants can reduce the Mn migration from the electrolytic manganese residue to water body,and the resistance control effect of M.floridulus is better than that of E.annuus,which has the potential of treating the Mn pollution in the electrolytic manganese residue storage site.