Efektivitas Biokoagulan Ampas Tebu Dan Serabut Kelapa Dalam Menurunkan Tss Pada Limbah Cair Industri Batik

Abstract

Batik wastewater contains suspended solids that may cause environmental pollution if not properly treated. This study aimed to determine the effect of mixed sugarcane bagasse and coconut fiber biocoagulant composition and settling time on TSS removal efficiency, to analyze the functional groups present in sugarcane bagasse and coconut fiber using Fourier Transform Infrared (FTIR), and to determine the most suitable coagulation-flocculation kinetic model. The study was conducted using a jar test method with biocoagulant composition ratios of sugarcane bagasse to coconut fiber of 100%:0%, 80%:20%, 60%:40%, and without biocoagulant 0%:0%, with settling times of 0, 60, 90, and 120 minutes. The results showed that both biocoagulant composition and settling time affected TSS removal. The lowest final TSS concentration was obtained at the 100%:0% composition with a settling time of 120 minutes, a TSS removal efficiency of 72% was achieved, with a final TSS concentration of 29,2 mg/L. FTIR analysis revealed the presence of O-H, C=O, C-H, C-O, and C=C functional groups, indicating the presence of lignocellulosic components such as cellulose, hemicellulose, and lignin. The kinetics of the coagulation–flocculation process were described using the pseudo first order and pseudo second order models. These models were used to evaluate the coagulation–flocculation behavior of the biocoagulant composed of sugarcane bagasse and coconut fiber. For each biocoagulant composition, the kinetic parameters, including the rate constant (k), coefficient of determination (R²), and half-life time (t₀.₅), were determined. The single biocoagulant consisting of sugarcane bagasse (100:0) was better described by the pseudo first order kinetic model, whereas the mixed biocoagulants composed of sugarcane bagasse and coconut fiber at ratios of 80:20 and 60:40 were better described by the pseudo second order kinetic model.