| The adsorption method is widely used in the water treatment and recovery process of organic wastewater including coking wastewater and oily wastewater. It is very effective for removing water particulate matter and refractiroy organics from wastewater. This method has advantage and disadvantage. How to enhance advantage and avoid disadvantage is an emphasis during research process. The coal is a complex porous medium and natural adsorbent. After adsorption, the coal would be used as original purpose and its value was not reduced. So the novel method of industrial organic wastewater was treatment by using coal adsorption was presented. In this dissertation, the simulation coking wastewater treatment by using the lignite, coking coal and anthracite are chosen as research object, the adsorption rule, adsorption efficiency, adsorption process, adsorption type and adsorption mechanism of degradation resistant organic compounds adsorption by coal were researched. Therefor the method of coal adsorption purification for organic wastewater was presented. The effect of this method applied in the coking wastewater treatment and oily wastewater treatment were investigated, which provide the guidance to the development and industrial application of coal adsorption purification method in organic wastwater. The major research includes the following aspects:The physicochemical properties of three kind’s coal were analysed. The mineral composition, surface micro topography characteristics, surface oxygen-containing functional groups compose and contents of three kinds of coal were analysed through using XRF、XRD、SEM、FTIR and titration research methods, respectively. The characters includes specific surface area, pore specific surface area, pore volume and pore size distribution were received by using BEL automatic adsorption instrument. The effect of different p H values on specific surface area of coal was obtained. The heat stability of coal was researched by using TG-gas chromatography/mass spectrometry equipment. The feasibility of coal as adsorbent was provided from the research result of physicochemical properties of coal.The physicochemical properties of regular indices, organics compose and concentrations were tested using by regular water quality analysis and GC/MS methods. The main pollutant of coking wastewater was phenol chemicals, next are quinolines, pyridines, indoles and other macromolecule condensed ring compounds.The static adsorption system of organic adsorption on coal was established. Theassay method of organics content was determined. Several operating parameters which impact removal efficiencies of sole macromolecule organics(including quinoline, pyridine, indole and phenol) including coal consumption, constant temperature oscillation adsorption time, different of initial concentrations, different p H values and different adsorption temperature were investigated through static adsorption experiment. The adsorption efficiencies of coal adsorb mixture organics were also investigated. There is the competitive adsorption between different organics because of that different organics has different adsorption diameter and point due to different organics has different molecular organization, molecular structure, functional group andmolecular sizes. The order of adsorption efficiencies was quinoline>indole>pyridine>phenol as research results.The thermodynamics characteristics of macromolecule organics(including quinoline, pyridine, indole and phenol) adsorption by lignite, coking coal and anthracite were investigated. The adsorption isotherms of three kinds of coal were fitted by using five different adsorption models such as Langmuir, Freundlich, Temkin, Redlich-Peterson(R-P) and Dubinin-Radushkevich(D-R). The error analysis of fitting results were calculated and obtained. The processes of macromolecular organic matters adsorption by lignite, coking coal and anthracite matched both the Freundlich and R-P models very well. The quinoline adsorption by coking coal was used as research object, and the relevant thermo dynamical functions of ΔG°, ΔH°, ΔS° were calculated and obtained. the adsorption process was spontaneous process because the ΔG° vaule is less than 0, it is exothermic reaction because the process heat release is around 20.00 KJ·mol-1 that was from ΔH°=﹣21.27 KJ·mol-1, so the low adsorption temperature is advantage for adsorption process. The result of ΔS°= ﹣ 66.48 J·mol-1·K-1<0 showed that adsorption entropy decreased in this process because organic molecule movement was under restriction after adsorption on the coal surface.The adsorption kinetics characteristics of macromolecule organics(including quinoline, pyridine, indole and phenol) adsorption by lignite, coking coal and anthracite were investigated. The adsorption kinetics curves of three kinds of coal were fitted by using four different adsorption models such as pseudo-first order kinetic expression, pseudo-second order kinetic expression, intraparticle diffusion model and bangham model. The error analysis of fitting results were calculated and obtained. The processes of organics adsorption by different kinds of coal accorded with pseudo-first order kinetic very well. Both of internal diffusion and film diffusioncontrol the adsorption rate together according to experiment date. The correlation between adsorption rate and specific surface area of adsorbent is positive. The quinoline adsorption by coking coal was used as research object, the adsorption activation energy Ea was 5.51 KJ·mol-1, the adsorption process belong to physical adsorption according to the calculation tesults. The adsorption was easy because the adsorption activation energy was small.The dynamic adsorption system was established. The dynamic adsorptions of macromolecule organic adsorption by lignite, coking coal and anthracite were investigated. The effects of its main parameters including adsorbate concentrations, flow arte, the number of adsorption column were discussed. The quinoline adsorption by three kinds of coal were used as this research object, the adsorption kinetic model of adsorption column was established. The breakthrough curve of adsorption column can be forecast well by this model.Compare to the FTIR, SEM, and XPS photographs of between before adsorption and after adsorption of lignite, coking coal and anthracite. The points of zero charge and isoelectric points of three kinds of coal were tested. The organic adsorption on coal has both physical adsorption and chemical adsorption according to the research results. The adsorption mechanism was received.The method of coal adsorption purification for organic wastewater was presented. The effect of this method applied in the coking wastewater treatment and oily wastewater treatment were investigated. The best operation conditions for two kinds of wastewater treatment by using this method were determined. The adsorption purification mechanism for oily wastewater by using this method was researched. The adsorption type and the processing of adsorption purification were obtained. |
PDF Full Text Request