wherein the porous biological polymerizing agent consists of irregular spheres obtained by thoroughly mixing 50 wt % to 70 wt % of a first agent and 30 wt % to 50 wt % of a second agent, and the irregular spheres have a pH of 5.0 to 6.0;

the first agent is obtained by thoroughly mixing 10 wt % to 30 wt % of cellulose, 20 wt % to 50 wt % of starch, and 20 wt % to 40 wt % of an amino acid, and a sum of a weight percentage of the cellulose, a weight percentage of the starch, and a weight percentage of the amino acid in the first agent is 100 wt %; and

the second agent is obtained by thoroughly mixing 40 wt % to 70 wt % of saccharifying enzyme (SE) and 30 wt % to 60 wt % of citric acid,

the method comprising:

preparing the porous biological polymerizing agent into an aqueous solution of 1 wt % to 2 wt %, then feeding the aqueous solution into a pipeline delivering a sediment to obtain a mixture, and

thoroughly mixing and pumping the mixture through a pipeline pump to a geotextile bag, a mud storage yard, or a dewatering device for a mud-water separation,

wherein an amount of the porous biological polymerizing agent used accounts for 0.06‰ to 0.10‰ of a weight of the sediment to be treated.