Competitive adsorption of main organic pollutants from coking wastewater on coking coal

Abstract：Using ultraviolet spectrophotometry absorbency-simultaneous equations method to detect the concentration of coking wastewater mixed simulated wastewater.Took the phenol,pyridine,quinoline and indole which were main organic pollutants in the effluent of secondary sedimentation tank as example.The adsorption capacity and adsorption rate of the major organic pollutants from coking wastewater on coking coal by single adsorption were analyzed and compared with competitive adsorption.The results show that the order of adsorption capacity in the sequence is phenol quinoline indole pyridine in the competitive adsorption.The total adsorption capacity on coking coal mixed system is approximately equal with the adsorption capacity of the single component system.The adsorption of quinoline on coking coal can be described by multi-molecular layer.The adsorption of phenol,pyridine and indole on coking coal are identified to be a mono-molecular layer adsorption model.Pyridine and indole absorption are steady and not influenced by the concentrations of other components.The adsorption of phenol is unsteady,which has a adsorbate behavior with quinoline and a direct adsorption site competition.In the competitive adsorption,the second-order kinetic model of phenol,pyridine,quinoline and indoles are fit more well than first-order kinetics model.