Method and equipment for near in-situ removal of heavy metal ions from groundwater

Abstract

The invention relates to a process for removing heavy metal ions from groundwater. According to the process, a pumping well is arranged, the bottom portion of the pumping well is provided with a submersible pump, the pumping well is divided into an upper layer and a lower layer by a separation plate, the outlet of the submersible pump is arranged at the central outlet of the separation plate, groundwater directly enters from the bottom portion of the well or enters through the submersible pump, and in the pumping well, an iron plate is used as an anode, and a cathode is a composite electrode comprising a metal selected from iron, platinum and copper or carbon and Fe3O4; iron is used as an anode, a composite electrode prepared from a metal electrode or carbon and Fe3O4 is used as a cathode; a voltage is applied between the anode and the cathode prepared from the composite electrode, the groundwater directly enters from the bottom portion of the well or enters through the submersible pump, the anode iron is dissolved, and the iron ions enter the water; the Fe3O4 in the cathode can adsorb heavy metals in the water; the groundwater treated by the anode and the cathode flows upward and is mixed while the magnetic Fe3O4 particles returned from an aging device are added; and the water is sufficiently mixed and reacts in a ferrite precipitation reactor, and the heavy metal ions in the groundwater are removed under the actions of flocculation, net catching and adsorption.

Description

technical field [0001] The invention relates to a treatment process for removing heavy metal pollutants in groundwater, in particular to a process and a device for coupling treatment of groundwater with electrochemical and ferrite precipitation. Background technique [0002] Years of rapid economic development and insufficient environmental protection measures have caused my country to face an increasingly serious water crisis. This includes not only large areas of polluted rivers and lakes, but also increasingly polluted groundwater. Among the various pollutants in groundwater, heavy metal pollution is cumulative, hysteresis, concealment, and irreversible damage to the human body. The treatment of heavy metal pollution in groundwater has become a key issue in the environmental field. The treatment processes for heavy metal pollution in groundwater include: phytoremediation, infiltration wall method, and adsorption method. [0003] Phytoremediation utilizes the enrichment o...

AI Technical Summary

Problems solved by technology

There are also related studies on the use of active adsorption materials for cathodes. Patent 201110312666.7 uses conventional dense mesh materials to fix active materials for the preparation of electrodes. The active materials used are activated carbon, zeolite, etc. The electrode manufacturing process is complicated, and active materials that absorb heavy metals need further research. treatment to avoid secondary pollution

[0005] In addition, the sludge produced by electrochemistry is the hydroxide of heavy metals, which has poor stability and high toxicity.

These shortcomings limit the popularization and application of electrochemical methods

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