Abstract: Semi-coking wastewater was treated by self-made Ce-Mn/AC. The effects of pH and dosage of Ce-Mn/AC on COD removal rate of semi-coking waste water were studied by static examination of equilibrium adsorption. The adsorption properties of semi-coking wastewater on Ce-Mn/AC was investigated by using adsorption kinetics model, adsorption isotherm and adsorption thermodynamics model to fit the adsorption process, and the probable adsorption mechanism was induced by GC-MS and UV-vis analysis. The results show that the semi-coking wastewater adsorption capacity on Ce-Mn/AC was 82. 9 mg·g-1, and the COD removal rate was 84. 6% when under the Ce-Mn/AC dosage was 10 g· L-1 without adjusting the pH value of semi-coking wastewater. The adsorption kinetics fitted pseudo-second-order model, Freundlich model could better describe adsorption of semi-coking waste water by Ce-Mn/AC,△G<0,△H>0 and △S>0 indicated that the adsorption was spontaneous, endothermic and mainly by chemisorption process. Refractory organic compounds such as polycyclic aromatic hydrocarbons and nitrogen heterocyclic compounds were adsorbed before monocyclic aromatic compounds, so the effect of refractory organic compounds on the following semi-coking wastewater-treatment system was greatly induced and some data and theory foundation were provided. Adsorption and desorption experiments indicated that the adsorbent had a better property for repeated use.

Key words: metal loaded on activated carbon;semi-coking wastewater;kinetics;thermodynamics;organic pollutant