Effect of Eco-Enzyme Dosage Variations in an Intermittent MBBR System on the Efficiency of Domestic Wastewater Treatment: Pengaruh Variasi Penambahan Eco-Enzyme pada Sistem Intermittent MBBR terhadap Efisiensi Pengolahan Limbah Domestik

Adinda Permata Salsabila (UPN “Veteran” Jawa Timur)
Praditya Sigit Ardisty Sitogasa (UPN “Veteran” Jawa Timur)

Media Ilmiah Teknik Lingkungan
Vol. 11 No. 2 (2026): Media Ilmiah Teknik Lingkungan (MITL)

This study aimed to analyze the effect of a Moving Bed Biofilm Reactor (MBBR) operated under oxic–anoxic conditions with the addition of an external carbon source in the form of eco-enzyme during the anoxic phase on the reduction of COD and BOD concentrations in domestic wastewater. The investigated variables included oxic–anoxic duration ratios (2:1, 4:1, and 6:1) within an 8-hour operational cycle and eco-enzyme dosages (0%, 0.5%, 1%, 1.5%, and 2%). The results showed that at an oxic–anoxic ratio of 6:1, the addition of 1.5% eco-enzyme achieved COD removal efficiency of up to 87%, while a 2% dosage resulted in BOD removal efficiency of 89%. These findings indicate that the appropriate eco-enzyme dosage enhances the biodegradation of organic compounds and supports biological organic removal in the intermittent MBBR system by creating optimal reactor environmental conditions.