A method for combining nano-zero valent iron and reducing microorganisms to remediate contaminated sites

Abstract

The invention relates to a contaminated site remediation method, in particular to utilization of nanoscale zero-valent iron particles and orthotopic injection of microbial bacteria in a site, namely, a contaminated site remediation technology adopting nanoscale zero-valent iron and a microorganism remediation technology. The method for remedying the contaminated site through combination of the nanoscale zero-valent iron and reducing microorganisms comprises steps as follows: a nanoscale zero-valent iron injection is injected to contaminated soil through an injection well, and the nanoscale zero-valent iron in the injection is coated with an organic polymer coating layer. The method is characterized in that after the nanoscale zero-valent iron injection coated with the organic polymer coating layer is injected and the nanoscale zero-valent iron in the injection is completely oxidized, a reducing bacterium solution is injected into the contaminated soil for microorganism remediation. The organic polymer layer on the surface of the nanoscale zero-valent iron can stop agglomeration of the nanoscale zero-valent iron, can promote growth of indigenous microorganisms and accelerates pollutant degradation. According to the remediation method, the synergistic effect for the nanoscale zero-valent iron remediation technology and the microorganism remediation technology for the contaminated site remediation is realized.

Description

technical field [0001] The invention relates to a method for remediating a polluted site, in particular to the use of nanometer zero-valent iron particles and in-situ injection of microbial fungi, that is, nanometer zero-valent iron contaminated site remediation technology and microbial remediation technology. Background technique [0002] Due to the extremely small particle size and the resulting large specific surface area of ​​nano-zero-valent iron, it exhibits a high oxidation-reduction potential, which can reduce a variety of halogenated organic pollutants, high-priced heavy metal ions, and inorganic pollutants (such as Nitric acid / nitrite), etc., and nano-zero-valent iron can be injected into the underground of the polluted site to achieve the purpose of in-situ rapid repair of the polluted site. However, the nano-zero-valent iron particles are oxidized while reducing pollutant molecules, forming a layer of iron oxide layer on the surface of the nano-zero-valent iron p...

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Problems solved by technology

Although this document combines nano-zero-valent iron and microorganisms (H1) to jointly explain PCB101, the method is to first reduce and remove part of the chlorine atoms in PCB101 molecules through nano-zero-valent iron under anaerobic conditions, and then oxidize them through good bacteria. Intermediate product, because it needs to meet anaerobic-aerobic conditions in sequence, so it is not suitable for remediation of contaminated sites under anaerobic conditions