OPTIMISATION OF ALUM (Al2(SO4)3) DOSAGE TO REDUCE TURBIDITY AND DISINFECTION OF WATER FROM EMBUNG PEPE, NGANTI VILLAGE, NGRAHO SUB-DISTRICT, BOJONEGORO DISTRICT Wahyunanto A Nugroho*, Fransiska Vinawati Putri, Yusuf Wibisono
Bioprocess Engineering, Universitas Brawijaya, Indonesia
*wahyunanto[at]ub.ac.id
Abstract
Clean water is essential for human survival, and its availability depends on quantity, quality, and continuity. Pepe Hamlet has two water sources: wells and reservoirs. While well water is abundant, it has high hardness. The reservoir (embung) water, available during the dry season, does not meet drinking water quality standards, requiring treatment. This study aims to determine the optimal alum concentration and contact time to reduce turbidity and assess the disinfection process^s effectiveness in reducing microbial levels. The research employs literature and experimental methods, using Response Surface Methodology (RSM) and Central Composite Design (CCD) models for data analysis. Results show that, during the dry season, a 4.219 g/L alum dose with a stirring time of 4.219 minutes achieves 99.528% turbidity reduction. In the rainy season, a 4.230 g/L alum dose with a 4.726-minute stirring time achieves 96.42% turbidity reduction. Additionally, a chlorine dose of 0.5 mg/L in the disinfection process eliminates 100% of total microbes.
Keywords: Coagulation-flocculation- Optimization- Water treatment
