Separation And Enrichment Of Organic Pollutants In Water And Degradation Methods

Molecularly imprinting technology (MIT) is a new technology with the characteristics of special selectivity and recognition. Combined the Molecularly imprinted polymer (MIP) with solid phase extraction (SPE), the sensitivity of analytical methods would be improved greatly because of the special capacity of separation and enrichment of MIP. Internal electrolysis and Fenton oxidation processes are effective technologies and have good prospect of development and application for the treatment of refractory organic wastewaters. In present study, the separation and enrichment of atrazine using SPE technique were studied in detail, and the degradation of organic wastewater by Enhanced Internal Electrolysis, Fenton oxidation and Enhanced Internal Electrolysis__Fenton combined process were investigated, the operational parameters and the degradation effect of each process were studied in detail. The results obtained in this study could provide some important theory and practice guides for the treatment of refractory organic wastewaters. All the experimental results were showed as follows:1.The preparation and evaluation of separation and enrichment efficiency of molecularly imprinted solid phase extraction (MISPE) column. In this study, MIP using atrazine as the template was prepared, a glass tube packed the particles of the MIP was employed as MISPE column. The test of binding capacity indicated that the maximum of absorption capacity of MISPE column was twenty-six times than that of MIP, and the binding time of MISPE column was cut to about one sixty-fourth of what the MIP had, so the binding performance of MIP was greatly enhanced. The comparative study of MISPE column and C18 column on separation and enrichment of atrazine showed that the MISPE column had distinct advantage for extraction and clean-up samples.2.The treatment of p-Nitrophenol (PNP) wastewater using Enhanc-ed Internal Electrolysis process. In this study, the copper-coated magnetic particles (CCMPs) were prepared by the combination of a chemical co-precipitation method with an electroless plating method and characterized by scanning electron microscope, X-ray diffraction and magnetization measurements. The Enhanced Internal Electrolysis process was employed for treating the PNP wastewater. The effects of quality rate of iron scraps to copper-coated magnetic particles, magnetic intensity, initial pH, aeration rate, and Na2SO4 dose on COD removal efficiency have been studied systematically. The degradation mechanism of PNP was also analyzed. The results of bath experiments indicated that with quality rate of iron scraps to copper-coated magnetic particles as 10, magnetic intensity as 0.04 T, initial pH as 4.0, aeration rate as 15 L/min, and Na2SO4 dosage as 2000 mg/L, after a reaction time of 3.5 h, the PNP was completely degraded and the removal efficiency of COD could reach as high as 72%. Under the same conditions, the treating effect of Enhanced Internal Electrolysis process was much better than that of traditional Fe/C process or Zero-valent Iron process.3.The analysis of factors influencing the degradation of refractory organic wastewater by Fenton reagent. In this study, Fenton oxidation process have been investigated to degrade NBCs wastewater. The operating conditions for the degradation of pollutants were determined via orthogonal experiment, and the effect of various operating parameters follows in the following decreasing order:initial pH>H2O2 dosage> Fe2+ dosage>temperature>reaction time. The optimal operating parameters were determined by single factor experiment and showed as follows:[H2O2]=80 mmol/L, [Fe2+]=8 mmol/L, initial pH=3.0, tempera-ture=25℃, reaction time=60 min. Under the conditions mentioned above, the removal efficiency of COD could reach 53.6%.4. The treatment of refractory organic wastewater using Enhanced Internal Electrolysis__Fenton combined process. In this study, Enhanced Internal Electrolysis__Fenton combined process was employed to treat refractory organic wastewater. The NBCs were used as the target pollutants and the operational parameters were optimized respectively first, and the reasons affecting the COD removal efficiency were analyzed. Experiments were conducted under optimum conditions to compare the difference among the treating effectiveness of the organic pollutants of Enhanced Internal Electrolysis__Fenton combined process, Enhanced Internal Electrolysis process, Fenton oxidation process and MISPE process.The results showed that the Enhanced Internal Electrolysis__Fenton combined process appears superior to other three processes in relation to the treatment efficiency and cost.