摘要 |
Using fly ash as a raw material, porous ceramic particles with an apparent density of 1.21 g/cm3, a visible porosity of 51.03%, and a specific surface area of 4.26 m2/g were prepared and used as biofilter materials for wastewater treatment. Through SEM, XRD analysis, and heavy metal leaching analysis, it was found that porous ceramsite were porous materials with rough surfaces. After calcination, the newly formed mineral was silicate calcium feldspar. The heavy metal concentration in the leaching solution of porous ceramsite met the national surface water quality requirements. The treatment of domestic sewage showed that the volumetric loads of CODCr, NH4+-N, and TN removed by the aerated biofilter were 5.23, 0.98, and 0.35 kg/(m3·d)), respectively, with removal rates of 85.46%, 96.13%, and 32.31%. |