“THE EFFECT OF HYDRAULIC RETENTION TIME (HRT) AND AERATION RATE ON THE REMOVAL OF COD, TSS, AND COLOR IN BATIK WASTEWATER USING A SEQUENCING BATCH REACTOR (SBR)” (2025) Lingkar: Journal of Environmental Engineering, 6(1), pp. 33–41. Available at: https://journal.ar-raniry.ac.id/index.php/lingkar/article/view/8503 (Accessed: 18 October 2026).