Method for restoring heavy metal contaminated soil

Abstract

The invention discloses a method for restoring heavy metal contaminated soil. The method comprises the following steps: with crylic acid modified chitosan as a restoring agent, placing polluted soil in a restoring agent aqueous solution and stirring and eluting, or applying the restoring agent aqueous solution to a paddy field to be ploughed and ploughing so as to transfer heavy metal from the polluted soil into eluent to realize restoring of heavy metal (Pb, Cr, Cu) contaminated soil. The crylic acid modified chitosan restoring agent is prepared by Michael reaction of chitosan and crylic acid, has the advantages of environmental friendliness, non-toxic and no harm, biodegradable property, no secondary pollution and rich material source. The restoring agent is good restoring effect for heavy metal contaminated soil, and the heavy metal content of restored soil reaches the primary standard of a farmland field. The chitosan derivative restoring agent is green, good in water solubility and high in chelating capability of heavy metal.

Description

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AI Technical Summary

Benefits of technology

This patented technology relates to improving methods for treating contaminated areas containing harmful substances like heavy metallics (Cu). By utilizing specific types of chains called shellfish amino sugars, these agents were found to effectively remove Cd2+ ion while also being able to fix certain elements like iron. These modifications made them easier to use even under extreme environmental conditions compared to existing techniques involving expensive reagents. Additionally, this new technique allows us to create highly selective chimeras between different metabolites within the same molecule, resulting in improved efficiency and reducing costs associated with traditional approaches. Overall, this approach provides technical benefits over current technologies including but limited successors.

Problems solved by technology

This patents discuss various methods used during treatment and removal of harmful substances like pesticides, fertilizers, iron salts, chromates, arsenites, bacteria, lithophorum spores, pollen grains, worm rods, algae, yeast cells, microorganisms, fungal diseases, molds, rust mitigators, phytoremers, carboxyl polymerase enzyme modifiers, amino acids, proteins, nucleic acid bases, antibodies, cytokines, cell signal transducers involved with photosynthetic reactions, nutrients, oxygen transportation systems, nitrogen fixatives, calcium sources, magnesium sulfite, zinc salt, selenium, cobalt, nickel, vanadium, molybdenum, tungsten, tantaponene, ceramics, plastic films, fibres, wood, seaweeds, vegetables, nuts, seashells, fish eggs, shellfish, crustacea, crops, roots, follicles, hairiness, odour production, taste sensations, reduced yields due to overexposure thereto. These technical problem addressed by this patented method involves developing effective ways to reduce harms caused by heavy elements including those found naturally occurring throughout their environment without causing negative effects upon humans and animals.