Suspended filler for biologically treating wastewater and a method for preparing the same

The present invention relates to a suspended filler for biologically treating wastewater, comprising a primary material, a specific gravity adjusting material and a microbial nutrient substance, wherein the primary material is a high-density polyethylene resin, which accounts for 95.5-98. 0 wt%; the specific gravity adjusting material accounts for 1.0-4.0 wt%; the microbial nutrient substance accounts for 0.1-0.5 wt%, and the suspended filler has a specific gravity of 0.96-1.1 g/cm3. The invention is reasonably designed for realizing a simple process with convenient material sources, It can produce a suspended filler having better rigidity and toughness property as well as a prolonged service life, and making the biofilm adhesion faster and more stable, also improving the utility of the biofilms.