The present invention relates to a sediment remediation agent for eco-friendly cleaning up of coastal surface sediments. According to the present invention, the sediment remediation agent is formed by mixing an oxygen generator capable of generating oxygen at a surface layer and bio-balls supporting microorganisms in zeolite. The sediment remediation agent was sprayed on the surface of the coast and exhibited excellent effects in various areas such as chemical oxygen demand, total nitrogen and total phosphorus. It is expected that an ecological environment of a coast can be changed in an eco-friendly manner by spraying the sediment remediation agent of the present invention on the surface of the coast and simultaneously introducing a technique for resolving the oxygen-deficient water mass layer of the coast.
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