... systems of either the packed or expanded type. The application of the fixed bed system has been shown to have several distinct advantages for water and wastewater treatment application [2]. In fact, ... Al-Ghouti, M .A. , Khraisheh, M .A. , Allen, S. and Ahmad, M.N. The Removal of Dyes from Textile Wastewater: A Study of the Physical Characteristics and Adsorption Mechanisms of Diatomaceous Earth. J. ... by Walker and Weatherley [7] where the authors found that by increasing inlet adsorbate concentration, the slope of the breakthrough curve increased and the International Journal of Energy and...