River bottom sediment washing and purifying device and construction method thereof

The invention discloses a river bottom sediment elution and purification device and a construction method. According to the first aspect of the invention, the river bottom sediment elution and purification device is provided; comprising a main shell, a bottom mud dehydration unit arranged in the main shell, a chemical disinfection unit, a thermocatalytic disinfection unit and a high-temperature sterilization unit which are sequentially connected with the output end of the bottom mud dehydration unit in a penetrating manner, and a drainage filtering unit which is arranged at the other output end of the bottom mud dehydration unit in a penetrating manner, dehydration, chemical disinfection and high-temperature sterilization integrated assembly line purification is adopted, and the sediment is finally discharged into the river channel again, so that deep purification of the river channel sediment is completed. Meanwhile, a chemical agent mixing and stirring procedure and a heating and catalyzing procedure are fi