Ismi Khairunnissa Ariani (2025) “Application of Mixed Pineapple Peel and Papaya Seed Extracts as a Biocoagulant for Reducing Fe, Mn, and Turbidity in Acid Mine Drainage Using the Jar Test Method”, SPECTA Journal of Technology, 9(3), pp. 291–302. doi: 10.35718/specta.v9i3.8481486.