The Research For Sulfate Reducting Bacteria Biological And Three Kinds Of Chemicals Stabilize The Combined Heavy Metals Pollution In Sediments

Qingshuitang Industrial Park is co mposed of co mpanies for heavy metal pollution such as Zhuzho u smelting group, and Xiawan Port is the primary water body for holding the wastewater fro m Qings huitang. By reason of accepting heavy metal conta minated effluent in the long term, the sedi ment of Xiawan Port deposited a large number of heavy metals. Sedime nt is an important gathering place for heavy metals in natural waters, and it also provides a place to live and food source for benthic organis ms. This makes sediment of heavy metals have the possibility of entering the food chain and lead to a direct or indirect threat to huma n health. Therefore, treatment for Xiawan Port is urgent. Among all kinds of remediation technology for heavy metals in sediment, the technology of sediment dredging combine with che mical solidification/stabilization usually used for practical engineering. Besides biostabilization of bioremediation Technique is one of the hottest issues in recent years.In this paper, the judgme nt of stabilization effect on the basis of BCR continuous extraction and leaching to xicity. The BCR results show that SRB have the ability of transforming metal forms to more stable precipitate, for exa mple the conversion rate of Cu is 33% for the best effect, the conversion rate is 28 %, 19% and 72% for Zn, Pb and Cd effects are second-best. In general, SRB perfor m the excellent effective for reducing toxicity of heavy metals. The leaching toxicity results show that, the stabilization efficiency of S RB for Cu is best with 100 %,for Zn is worse with 60%,for Pb is best with 100% and for Cd is second-best with 87%.For the high efficiency of stabilization, the SRB have the huge potential to be biological stabilizer.