| 简介 |
Provided is a method for producing recycled products such as block and biological filtering material for water treatment by using dredged sediment. 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. |
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