Resin Separation And Spectral Characterization Of DOM Of The Tail Water From Urban Sewage Treatment Plants

As the modern urban sewage collection and treatment rate increases,the recycling of sewage is becoming increasingly important.In the treatment process of urban sewage treatment plants,the processing and analysis techniques of conventional indexes have been very mature,but there are few studies on the treatment and analysis of organic matter pollution in tailings.In the tail water discharged from the city sewage,a wide variety of substances,and the relative concentration is low.The limitations of traditional chemical analysis methods lead to rapid characterization of materials and quantitative analysis is difficult to achieve,and molecular spectrum with its fast and sensitive characteristics of many organic matter rapid characterization method.In this paper,the composition and properties of DOM in urban tail water and pollutant river water samples were studied by fluorescence,ultraviolet and midof infrared spectroscopy combined with stoichiometric method.The main contents and results are as follows:1.The fluorescence spectra of protein and humus in tail water were obtained by three-dimensional fluorescence spectroscopy.The Domflour and PARAFAC analysis methods were used to extract the main component information and the composition of dissolved organic matter in tail water was obtained.research shows: The dissolved organic matter in urban tail water is divided into two major categories: protein and humus.The protein is divided into two substances,namely,lysine and tryptophan.Humic substances are divided into humic acid and fulvic acid.At the same time,it compares the upstream and downstream water samples of the sewage river,indicating that the effluent from the sewage plant plays a certain role in the purification of organic pollutants in the river.2.The low concentration of DOM water samples were enriched and separated by XAD-8 resin and anion and cation exchange resin to obtain hydrophobic substance:Hydrophobic bases?HOB?,hydrophobic acids?HOA?,hydrophobic neutral substances?HON?,Hydrophilic substances: hydrophilic bases?HIB?,hydrophilic acids?HIA?,hydrophilic neutral substances?HIN?.The hydrophobic substance accounts for about 75% of the total organic carbon content,and the hydrophobic substance HOA and HOB mainly contain the hydrophobic substance,and the hydrophobicity of the hydrophobic substance is about 75% of the total organic carbon content.Some fluorescent organic substances such as proteins,phosphate compounds,organic acids and other substances,in which the hydrophobic acidic substances are the main components of hydrophobic substances.Hydrophilic substances HIB,HIA,HIN mainly contains some non-fluorescent organic substances such as polysaccharides,lipids and so on.3.Based on the common humic substances,humic acid and fulvic acid,the extraction of specific chemical key information by UV and three-dimensional fluorescence spectra was carried out.The quencher Fe???was studied by the stoichiometric method.And the identification model of dissolved organic matter in tail water was established.The results show that there are fluorescence quenchingphenomena of humic acid and fulvic acid and meet the Stern-Volmer formula: I / I₀ =1-f_c * K_c * [c] /?1 + K_c * [c]?.The UV spectra of the humic acid were not affected by Fe???,and the three-dimensional fluorescence-UV spectra were used to construct the identification model of quencher Fe???.The actual sample of the forecast,the effect is good.