Development of biomass carrier from high-filled with microcellulose LDPE

Abstract

In this paper, a composite material based on LDPE filled with 30 vol.% wood microcellulose (MC), in order to assess the possibility of its use as a biomass carrier treatment facilities.The material was obtained in industrial conditions by means of a twin-screw extruder with a leaf head, then samples of a composite biomass carrier in the form of discs with a diameter of 4 cm and a thickness of 1.5 mm were obtained from the sheet by means of a cutting press.Investigated the microstructure and morphological parameters of the composite, it was found that the porosity is about 58%, the surface roughness is 3.5 units of density about 450 kg/cubic m. the basic technological parameters of the melt of the composite by the method of capillary viscometry, the dependences of the shear stress and the melt viscosity of the test material in the velocity range processing, it was found that the composite refers to satisfactory recyclable thermoplastics. Bagley correction was performed. The thermomechanical stability of the material was investigated, the critical temperature of processing-200 °C. the operational properties of the material were Investigated: the tensile strength was 1.6 MPa, the elongation at break-12%, water absorption for 24 hours of soaking-31.2%. The dry biomass residue of activated sludge for 10 days of its immobilization on a composite biomass carrier amounted to 5.54%, which exceeds by 2.4 times the biomass growth on the traditionally used material-pure polyethylene. The material has a relative chemical resistance, does not lose its performance over a long period of operation. In particular, the loss of tensile strength after 5-fold freezing, soaking in 0.01 n solutions of sulfuric acid, acetic acid and sodium hydroxide (for 6 months), exposure to UV solar radiation (for 12 months), soaking in water (for 12 months) did not exceed 10-12%. Thus, the composite composition of LDPE: MC (70: 30 vol.% ) can be recommended for use in biological treatment plants as a highly efficient carrier material-biomass.