Method for biological reduction of pentavalent antimony in wastewater by taking methane as electron donor

Abstract

The invention relates to biological removal technologies for heavy-metal wastewater and aims at providing a method for biological reduction of pentavalent antimony in wastewater by taking methane as an electron donor. The method comprises the steps: preparing simulated wastewater, and aerating the wastewater with argon gas, so as to obtain the simulated wastewater for later use under microaerophilic conditions; introducing the simulated wastewater into a methane matrix membrane bioreactor, adding Sb(V) and activated sludge, and carrying out self-circulation, so as to obtain a bacterial solution; and introducing the simulated wastewater and CH4 by adopting a continuous flow mode, carrying out gradient control on mass concentration of Sb(V) in influent water, and ensuring that the mass concentration of the Sb(V) in the influent water reaches a stable state for at least one week during the running of each stage. According to the method, microaerophilic CH4-MBfR can be used for effectivelyreducing toxic and water-soluble pentavalent antimony Sb(V) into trivalent antimony Sb(III) which is liable to precipitation, and thus, antimony pollution is removed from printing and dyeing wastewater.

Description

technical field [0001] The invention belongs to the technical field of biological removal of heavy metal wastewater, and in particular relates to a method for biologically removing antimony in wastewater by using methane as an electron donor. Background technique [0002] The printing and dyeing industry is one of the basic industries of my country's national economy, and its scale has become the first in the world. However, the printing and dyeing industry consumes a lot of water and has serious sewage discharge. The printing and dyeing wastewater produced by it contains a large number of stable and complex chemical substances (dyes, auxiliaries, heavy metals, etc.), which pose a huge threat to my country's water environment. Therefore, it is of great significance to strengthen the prevention and control of water pollution in the printing and dyeing industry. [0003] Metal antimony (Sb) pollution is a new challenge in the pollution prevention and control of printing and d...

AI Technical Summary

Problems solved by technology

In addition, some antimony-containing dyes, additives and other additives used in the weaving and printing process will also cause the antimony content in the printing and dyeing wastewater to seriously exceed the standard

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