A strain of sulfate reduction bacteria and process for using the same for treating acidic mine wastewater with straw as carbon nitrogen source

Abstract

The invention provides high-efficiency sulfate reducing bacteria (the bacteria is named Desulfotomaculum halophilum RETECH-SRB-II, the preservation unit is China Center for Type Culture Collection in Wuhan University, the preservation date is May 11th, 2007, and the preservation registration number is CCTCC NO of M207061) with wider growth temperature and pH applicability; the invention simultaneously provides a technique that can treat acid mine wastewater with the carbon and nitrogen source of straws. In the treating of the acid mine wastewater, the technique reaches the Cu<2+> removing rate of 89 to 97 percent, the Zn<2+> removing rate of 90 to 98 percent, the Fe<2+> removing rate of 91 to 99 percent, the Fe<3+> removing rate of 79 to 91 percent, and the As<3+> removing rate of 80 to 90 percent. The treated wastewater takes neutral pH value. The technique has the advantages that straws can be used as the carbon and nitrogen source required for culture growth, thus lowering the bacteria cultivation cost by 30 to 50 percent.

Description

A sulfate-reducing bacterium and its process for treating acid mine wastewater using rice straw as a carbon and nitrogen source technical field The invention relates to the technical field of microorganisms. In particular, a sulfate-reducing bacterium and its process for treating acidic mine wastewater using rice straw as a carbon and nitrogen source. Background technique The use of sulfate reducing bacteria to treat acid mine wastewater is to reduce the sulfate in acid mine wastewater to H2S through the biological reduction reaction of dissimilatory sulfate. Under different pH conditions, H2S can be used to selectively precipitate different heavy metals to form metal sulfides. In order to remove heavy metal ions in wastewater and recover valuable metals, the alkalinity generated in the bioreduction reaction can neutralize acid mine wastewater. The method has the characteristics of low cost, strong applicability, no secondary pollution, and the ability to recover heavy me...

AI Technical Summary

Problems solved by technology

However, the growth of sulfate-reducing bacteria requires additional carbon and nitrogen sources to complete. At present, the carbon and nitrogen sources used in existing processes are usually chemicals, which are expensive and costly to consume, which is not conducive to the promotion and application in industrial production.

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