Pradana, Brayan Multirizky, et al. “Circular Economy Approach in the Utilization of Cl? Purification Process Waste into Aluminum Sulfate”. AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment), vol. 10, no. 2, May 2026, pp. 250-6, doi:10.29165/ajarcde.v10i2.1058.