Preparation of High-porosity Ceramsite From Municipal and Flocculation Sludge

A porous ceramsite (PC) was prepared from municipal sludge (MS), flocculation sludge (FS), and quartz, with coal as the pore-forming agent. A single-factor uniform design method generated a regression equation, which contained 25 wt% MS, 33.3 wt% quartz, 16.7 wt% FS, and 25 wt% coal. The PC had water absorption of 57.2%, porosity of 60.89%, bulk density of 1.065 g/cm³, compressive strength of 1.8 MPa, acid resistance of 97.1%, and alkali resistance of 98.3%, it would be a very good water treatment carrier.