Cadmium-tolerant intestinal strain and cadmium adsorption method

Abstract

The invention discloses an Enterobacter sp. FM-1 obtained through separation from mining soil, purifying and domestication, deposited at China Typical Culture Collection on December22, 2017, the deposit number of which is CCTCC M2017825. The method comprises such steps as taking soil, culturing soil, obtaining initial extracting solution, enriching culture with LB liquid medium, purifying culturewith LB solid medium, inoculating single colony into LB plate medium containing cadmium for further domestication and culture, and obtaining Enterobacter sp. FM-1 with high tolerance to cadmium. The Enterobacter sp. FM-1 has good tolerance and adsorption properties to cadmium. The adsorption of cadmium in the medium containing 4 mmol L-1 cadmium. The maximum adsorption rate of cadmium was 80.36% at 30 DEG C and pH 7. 190.45 mg g-1 of cadmium adsorption capacity was added under sterile operation at this time. The strain can be applied to the remediation of cadmium polluted water and soil with phytoremediation, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of microorganisms, in particular to an enterobacter and a method for adsorbing cadmium. Background technique [0002] my country's soil is seriously polluted by heavy metals, and the land with cadmium as the main pollutant accounts for about half. The methods of remediation of cadmium-contaminated soil mainly include physical methods, such as soil washing method, soil replacement method, electrodynamic treatment method, vitrification and so on. These methods often have high technical requirements and high costs, and are not suitable for large-scale contaminated soil remediation. Chemical methods, such as adding zeolite, lime, fly ash, domestic garbage, etc.; these methods often have the characteristics of large impact on the environment, poor removal effect, and poor system stability. The biological method has attracted much attention because it is environmentally friendly, does not produce secondary pollu...

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Problems solved by technology

These methods often have high technical requirements and high cost, and are not suitable for large-scale contaminated soil remediation.

Chemical methods, such as adding zeolite, lime, fly ash, domestic garbage, etc.; these methods often have the characteristics of large impact on the environment, poor removal effect, and poor system stability

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