The invention discloses a covering carpet for repairing degradation-resistant organic substance contaminated
sediment in situ and a laying method of the covering carpet. The covering carpet comprises a bottom layer, a lower layer, an upper layer and a
surface layer from bottom to top in sequence, wherein the bottom layer is made of nonwoven
geotextile, the lower layer is a solubilizing layer, the upper layer is an adsorption filler layer, the
surface layer is woven
geotextile, the solubilizing layer adopts filler mixed by
rhamnolipid-modified
montmorillonite and
active carbon, the adsorption filler layer adopts a
quaternary ammonium salt type surfactant and organic
bentonite modified by
zirconium oxychloride octahydrate. The laying method of the covering carpet comprises the following steps: directly laying the covering carpet on contaminated
sediment, connecting adjacent covering carpet units through stubble, and additionally arranging a fine sand layer on the covering carpet. The filler is mixed by the
rhamnolipid-modified
montmorillonite and the
active carbon, so that degradation of degradation-resistant organic substances is promoted; modified organic
bentonite is adopted as the adsorption filler layer, so that adsorption capacity on organic pollutants in water is relatively strong; and the laying mode is flexible, construction is simple and convenient, and the
living environment of bentonic organisms is not damaged.