Competitive-adsorption-based in-situ quick restoration method for cadmium-polluted paddy field

Competitive-adsorption-based in-situ quick restoration method for cadmium-polluted paddy field

  • CN 104,874,601 A
  • Filed: 06/03/2015
  • Published: 09/02/2015
  • Est. Priority Date: 06/03/2015
  • Status: Active Application
First Claim
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1. the in-situ rapid renovation method based on the cadmium pollution rice field of competitive Adsorption, described method is that a kind of cadmium ion is from contaminated soil situ complexing stripping to paddy field water, chelating function non-weaving cloth competitive Adsorption from water is removed, the in-situ rapid renovation new method of complexing agent regeneration release cycle application, it is characterized in that, comprise the steps:

  • A) in cadmium pollution paddy field water, spray the heavy metal cadmium complexing that complexing agent aqueous solution makes in itself and soil, cadmium is transferred in liquid phase water solution from solid phase soil;

    B) use the tractor being provided with rotary cultivator by soil and aqueous solution rotary tillage mixing, make the abundant stripping of the heavy metal cadmium in soil;

    C) in rice field, drop into rapidly chelating function non-weaving cloth offset is dynamic and its sufficient competition is adsorbed, heavy metal cadmium moves on to non-weaving cloth from liquid phase Transfer in Aqueous Solution, is taken out by non-weaving cloth afterwards;

    D) heavy metal cadmium be combined with complexing agent in liquid phase water solution is had the chelating function non-weaving cloth competitive Adsorption of stronger chelation, and complexing agent obtains release regeneration simultaneously;

    E) circulate next time, namely repeat step b)-d), until Cadmium in Soil content reaches standard of soil environment quality;

    F) become soil and supernatant water solution by standing separation, the supernatant water solution containing complexing agent can be used for repairing other cadmium pollution rice fields.

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