Lightweight composite sewage treatment material and preparation method thereof

The invention discloses a lightweight composite sewage treatment material and a preparation method thereof, and belongs to the technical field of sewage treatment material preparation, the preparation method comprises the following steps: preparation of composite whiskers, preparation of ceramsite, preparation of intercalated montmorillonite, primary surface modification, and secondary surface modification; the preparation of the composite whisker comprises the following steps: preparing a magnesium oxide whisker, and coating; the primary surface modification comprises the following steps: adding ceramsite, intercalated montmorillonite, an acetic acid aqueous solution of chitosan and water into a beaker, stirring at room temperature, adding calcium carbonate and a glutaraldehyde aqueous solution, stirring, adjusting the pH value to 9-9.5, heating to 60-65 DEG C, stirring, filtering, cleaning filter residues, adding the cleaned filter residues and a hydrochloric acid aqueous solution into the beaker, stirring