METHOD FOR MAKING RECYCLING PRODUCT OF DREDGING SEDIMENT

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PURPOSE : Provided is a method for producing recycled products such as block and biological filtering material for water treatment by using dredged sediment. CONSTITUTION : The recycled product, biological filtering material for water treatment, is produced by the following steps of : treating dredged sediment mechanically, physically, or chemically to separate aggregate and earth of dredge; dehydrating and drying dredged earth to contain 20-30% of moisture; optionally adding 5-40ppm of coagulants such as Al2(SO4)3, Ca(OH)2 and AlCl2, and 10wt.%(based on total amount of dredged earth and sludge) of dried sewage sludge; mixing raw materials homogeneously; forming mixtures into a sphere shape; making a hole, having a size corresponding to 10% of sphere diameter, in the x, y and z direction of the formed sphere; drying preforms for 2-3days at room temperature; sintering dried products at 1100-1700deg.C for 1-3hrs; cooling sintered products to room temperature. © KIPO 2005