Study On The Adsorption Of Blue/Red Substances And The Optical Properties Of Black And Odorous Water By Four Adsorption Materials

Nowadays,Aquatic environment of city has gradually become one of the important factors restricting the development of urban economy,urban water environment management has become a key point of environmental governance in our country,especially the black and odorous water bodies.Carrying out the research on black and odorous water in various aspects is very important,to control it.As the most common method to remove target pollutants,adsorption method has a wide range of application.The adsorption materials used in this study included two of the most common activated carbons,they were coconut shell and coal-based activated carbon,and two kinds of agricultural waste biomass,were walnut shell and corncob.First,using the four materials to adsorbed and treated the two colored water simulated by two kinds of dye,investigated the adsorption efficiency of the four adsorption materials for different types of colored wastewater,then compared and analysed their adsorption performance by Scanning Electron Microscope（SEM）,Brunauer Emmett Teller（BET）,Fourier infrared spectrogram,and Boehm titration.Finally,sampling the water from the typical southern black river,then analyzed the spectrum absorption characters of Dissolved Colored Organic Matter（CDOM）in the water with UV-Vis absorption spectra,discussed the correlation between absorption coefficient and black odor evaluation index.In addition,to research the effect of the adsorption method on the actual black and odorous river water,column adsorption experiment was carried out with four adsorption materials on CDOM of the water.The main results were as follows.The adsorption effect of coconut shell on Methylene blue is the greateast,and coal-based activated carbon is better than corncob,walnut shell is the worst.In 480 minutes,the adsorption rate of 1g every material on Methylene blue simulated wastewater is 99.8%,99.7%,94.7%,52.9%,respectively.The adsorption effect of four material on Congo red simulated wastewater sort by rank is coal-based activated carbon,coconut shell activated carbon,corncob,walnut shell.The adsorption rate of 1g every material to Congo red simulated wastewater reached 85.6%,67.8%,48.3%,10.3%,respectively.Langmuir isothermal adsorption equation,quasi-second-order kinetic model and particle internal diffusion fitted well with the adsorption of methylene blue and the core-red process of the four adsorption materials.The adsorption of the four materials to the two dyes is more likely tend to mono molecule layer adsorption,particle diffusion is not the only airspeed step in the adsorption process.Except that,the adsorption thermodynamic parameters ?G^θ of the four materials to the two dyes were negative,?S^θ与?H^θ were all positive,illustrats that Adsorption is a process which is spontaneous,endothermic and The surface molecules tend to go unordered.Characterization results showed that both kinds of activated carbon have high specific surface area and pore volume,the specific surface area of coconut shell and coal-based activated carbon is 707.4 m³/g and 293.9 m³/g,respectively.However,the surfaces of the agricultural waste biomass adsorption materials have good pore structure and more oxygen functional groups than the activated carbon materials.In addition,the toal number of acid functional groups of walnut shell is 1.162 mmol/g and corncob is 1.537mmol/g,particularly corncob has the potential to be a good adsorption material.The range of the CDOM absorption coefficient a₃₅₅55 of the target black and odorous water was from 19.324 to 132.276 m^-1 and the average was 74.183 m^-1 evidently higher than the other pollutant-holding water in our country.According to data,there is a good correlation between the CDOM concentration and the DOC,the linear correlation determination coefficient was 0.815,which confirmed the feasibility of using CDOM spectroscopy to study the water body of typical black and odorous river in the south,provided a new thinking for the analysis and research.The analysis of some spectral parameter,suggested that CDOM humic acid in the target water is abundant,and the aromatic nucleus of its aromatic compounds are dominated by carboxyl,hydroxy and carbonyl.a₃₅₅ had a good correlation with ammonia nitrogen,transparency,Oxidation-Reduction Potential（ORP）et.Which are used to evaluate black and odorous water,while the linear correlation coefficient of a₃₅₅ with transparency and ORP reached0.799 and 0.719.