Abstract
In this study, a ceramic membrane matrix was prepared using mineral sludge compounded with kaolin as a sintering additive and an alumina ceramic membrane film layer was prepared by spraying method and applied to dyeing and printing wastewater treatment. The matrix ceramic membrane with mechanical strength of 69.12 MPa, pore size of 35.77 nm, and permeation flux of 6459.84 L·m− 2·h− 1·bar − 1 was finally prepared at a composite addition ratio of 0.75:1 of mineral sludge and kaolin, a starch content of 9 wt%, a polyvinyl alcohol (PVA) content of 4 wt%, and a sintering temperature of 1150℃. The PVA content of 5.5 wt%, alumina (Al2O3) content of 10 wt%, sintering temperature of 1100℃, sintering time of 180 min, and the number of spraying times of 4 times under the experimental conditions of the monolayer ceramic membrane by spraying method, the acid resistance rate was 99.09% and the alkali resistance rate was 99.93%. The results showed that after accessing the MBR system, the single-layer ceramic membrane had a high treatment effect on NH4+-N, which realized the resourceful use of mineral sludge and the low-cost application of the ceramic membrane.