Production of cost-effective activated carbon from tea waste for tannery waste water treatment

Abstract

Abstract In this study, we attempted to develop a cost-effective activated carbon (AC) from local tea waste. AC was synthesized via a pyrolysis process and used it to treat tannery waste-water. A methylene blue adsorption test was then conducted to determine the highest adsorption capability of synthesized AC. The crystal structure and microstructure of AC were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). An average crystallite size of 15 nm was measured from XRD while sub-nano meter scale particle size was confirmed from SEM images. Produced AC was then used for the treatment of industrial waste-water that results in a reduction of about 89–97% chromium from water. In addition, other physical parameters (Biochemical oxygen demand chemical oxygen demand turbidity, conductivity, Cr content) were also significantly reduced from the waste-water. These results suggest the use of AC for the treatment of industrial as well as domestic waste-water.

Keywords

• Pyrolysis
• Scanning electron microscopy
• X-ray diffraction
• Activated carbon.