AbstractThis research aimed to investigate the adsorption of heavy metals and dyes using adsorbent and filter cartridge from kenaf bast fiber (KBF). This research was conducted in several stages starting with adsorption and characterization studies followed by production and evaluation of filter cartridge prototype. Adsorption was studied through removal of heavy metals (Cd, Cu, Ni, Pb and Zn) and dyes (Congo red, Methyl orange, Methylene blue and Rhodamine B.) in single- and multi-systems. The effects of experimental variables (solution pH, initial concentrations and adsorbent dosage) on adsorption of KBF were also assessed. The adsorption equilibrium was analyzed using Langmuir and Freundlich isotherm models. The KBF adsorbent was characterized using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-Ray (EDX) spectrometer and Fourier Transform Infrared Spectrometer (FTIR) before and after adsorption process. The performance of filter cartridge prototype to treat synthe.....