Autoclaved aerated concrete waste (AACW) resulted from construction and demolition was used as a bio-carrier in a passively aerated biological filter (PABF) treating municipal wastewater. Physical, chemical and morphological characterization of AACW were carried out in terms of X-ray diffraction, surface area, porosity, scanning electron microscopy and energy-dispersive X-ray. Results showed that the main crystalline phases in AACW are mainly oxides of SiO 2 , CaO and Al 2 O 3 beside hydrous silicates (Ca 5 Si 6 O 18 H 2 ). In addition, AACW has a rough surface with a high specific surface area of 42.8 m 2 /g. Different from commercially available bio-carriers, AACW has an open macro- porous structure that is suitable for immobilizing microorganisms. The use of AACW as a bio-carrier in a pilot scale PABF reactor improved greatly the removal of organic and inorganic pollutants. Average removal values of chemical oxygen demand, biochemical oxygen demand and total suspended solids were 90%, 92% and 89% with corresponding average residual values of 36.4, 17.2, 11.3 and 3.3 mg/L. Results indicated that the potential of using AACW as a bio-carrier in a PABF is recommended and it provides a promising approach to utilize construction and demolition solid waste.
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Abou‐Elela et al. (2019) studied this question.
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