Application Of Zeolite-Activated Carbon Composite Materials To Coking Wastewater Treatment

In this paper, a granular composite materials containing activated carbon/zeolite was prepared from coal gangue and pitch power, Which was applied to coking wastewater treatment. And for the thermodynamics and kinetics of one-component coking wastewater in-depth study, investigated for removing the influencing factors of the various components of the coking wastewater, comprehensively. Further, Activated sludge units added with bio-carriers are called as hybrid biological reactors, compared with traditional sludge units. The experimental results showed that:1.The thermodynamics and kinetics for ammonia and phenol, respectively.(1)Batch test were performed under a range of conditions to assess the different initial ammonia concentration of phenol, respectively, to control temperature in the30℃,35℃. and40℃.the data obtained was fitted to the Langmiur, Freundlich, Redlich-Peterson (R-P) and Toth models with the R-P model providing the better description of the process. It describes that the composite surfactant bit is uneven. The free energy change (ΔG°) and the enthalpy change (ΔH°) showed that the process was feasible and endothermic respectively.(2) Batch test were performed under a range of conditions to assess the initial ammonium and phenol concentration100～500mg.L-1to carry out kinetic experiments, under normal temperature at25℃. The data results show that the adsorption characteristics can be more than90%in a short period of time and slow to reach the equilibrium. The adsorption kinetics of phenol on composite materials was investigated by three different methods:Pseudofirst-order, pseudosecond-order,and intraparticle diffusion. The data show that the pseudosecond-order kinetic model was more suitable for description of the adsorption process of ammonium and phenol on the composite materials.2.Coking wastewater containing ammonium and phenol at the same time.(1)The optimum particle size of adsorption experiments is between20to80mesh, pH is6.5～7.0, the dosage is6g/L, the contact time is60h.(2)Batch test were performed under a range of conditions to assess the different initial ammonia concentration of phenol, simultaneously. The data indicated that the R-P model provided the better description of the process which was feasible and endothermic. The free energy change (ΔGo) and the enthalpy change (AHo) showed that the process was feasible and endothermic respectively.(3)Through competitive adsorption of three kinds of material, the experimental results showed that phenol and organic matter on the absorption of ammonia nitrogen in composites have insignificant impact, but the ammonium had an adverse effect of removal efficiency of phenol, but had the promoting effect of COD.3. Coking wastewater containing ammonium、phenol and COD at the same time(1)Batch test were performed under a range of conditions to assess the effect of contact time, solution pH and the adsorbent dosage on the performance and capacity of the media for this application. The data demonstrated that The optimum pH is6.0～7.0, the adsorbent dosage is lOg/L, the contact time is90min. Furthermore, the data indicated that the R-P model provided the better description of the process which was feasible and endothermic.(2)Then comparison of different adsorbents for simultaneous coking wastewater contained ammoniunm、phenol and COD, It is clear to see that composite materials combined the performance ammonium ion-exchange of zeolite and adsorption of activated carbon, which represents a potentially viable and powerfull tool, leading to the plausible improvement of environment preservation.4. Activated sludge units added with bio-carriers are called as hybrid biological reactors(HBR), compared with traditional sludge units.(1) The activated sludge of the dosing zeolite material can not only increase the concentration of microorganisms in the system and enhance effects on organic loading rate, but also strengthen nitrogen removal and sludge dewaterability. Which is mainly due to the ion-exchange of zeolite materials and improving the denitrification capacity of the system.(2) the actual coking wastewater treatment results show that HBR can enhancement effects on higher organic loading.