Surface layer improvement system and methods for on-site remediation of contaminated sediments

A surface layer improvement system for on-site remediation of contaminated sediments at a water bottom floor, the surface layer improvement system comprising:

• a stabilizer spray unit that performs underwater spraying of a stabilizer to a remediation target region;
• and
• a disturbing and mixing unit that induces bioturbation by mixing the stabilizer with the contaminated sediments in water,
• wherein the stabilizer spray unit includes:
• a stabilizer storage in which the stabilizer is stored,
• a stabilizer supply pipe in which the stabilizer is transferred and guided from the stabilizer storage, and
• stabilizer spray pipes which are connected to the stabilizer supply pipe and through which the stabilizer is sprayed to the remediation target region,
• wherein the stabilizer supply pipe has a distribution vane which partitions an inner channel of the stabilizer supply pipe into a plurality of channels, and
• wherein the stabilizer spray pipes are arranged radially about the stabilizer supply pipe and are formed to rotate about the stabilizer supply pipe, have respective angle adjusters which adjust an arrangement angle with respect to the stabilizer supply pipe, and enable a spraying range of the stabilizer to be adjusted by adjusting a rotation speed or an arrangement angle.