The non-sintered foundry dust (FD) based ceramsite formed by curing steam (FDNCCS), and non-sintered FD based ceramsite formed by curing CO₂ (FDNCCC) were obtained under steam temperature of 80˚C for 16 h, and air humidity at 70%, temperature at 20°C, and CO₂ volume fraction of 20% for 2 h. The compressive strength, specific surface area, and the water absorption rate were respectively 5.18 MPa, 48.1%, and 22.4% for FDNCCC. Compressive strengths of FDNCCC were found to be 2.2 times than that of FDNCCS. The specific surface areas of and total pore volumes of commercial non-sintered ceramsite (CNC), FDNCCS, and FDNCCC were respectively 12.04 m²/g and 0.0621 cm³/g, 27.46 m²/g and 0.0795 cm³/g, and 28.11 m²/g and 0.1328 cm³/g, indicating that FDNCCC and FDNCCS have higher the specific surface area than that of CNC, and the total pore volume of FDNCCC is nearly twice that of the other two types of ceramsites. Biofilm was easy to form on the surface of FDNCCC as biocarrier in biological aerated filters (BAF), and the removal rate of COD, NH₄⁺-N, TN, and phosphate were respectively 75%-85%, 80%-90%, 55%-65%, and >85% were obtained when BAF with FDNCCC as biocarrier was used to treat swine wastewater.

Yue Zhang. Purification of swine wastewater using a biological aerated filter with non-sintered foundry dust based ceramsite. Academic Journal of Materials & Chemistry (2024) Vol. 5, Issue 2: 46-54. https://doi.org/10.25236/AJMC.2024.050208.

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