A simple UV spectrophotometric procedure is proposed for the survey of an industrial sewage system. Simple, fast and reliable, this technique has been first designed for natural and waste water. It is based on the assumption that any UV spectrum of a sample can be decomposed by using a set of reference spectra. The main application is the determination of specific compounds such as nitrate or anionic surfactants (expressed as DBS) or the estimation of global parameters such as COD, TOC or TSS. Another interest can be found in process control or alarm detection. Based on the UV light absorption by all unsaturated compounds and particularly anthropogenic organic matter, the method is obviously limited by the nature of organics. So, its use for industrial application needs a good knowledge of wastewater composition -and variation- for the choice of the dedicated spectra library. This paper will present the industrial application of UV spectrophotometry including the methods for the definition of the spectra libraries. Its application in the wastewater survey of a large petrochemical site, located in the South of France, is also presented.
There is a tendency to design biological units for chemical or petrochemical wastewater treatment. Some of these treatment plants are even sometimes used for the degradation of any external industrial sewage transported for the purpose. In this case, the decision to accept or refuse the waste must be rapid and sure. The aim of this paper is to propose a new treatability test based on a direct far UV photooxidation of the sample, coupled with a UV spectrophotometric survey of the waste quality. The test has been applied on different samples from chemical and petrochemical industries and the results have been compared to those obtained with more classical tests, as for example, biodegradation tests using either air or pure oxygen. For most of the samples, quite good correlation has been observed between the photooxidation test and biodegradation. The UV treatability test is currently used for checking up on petrochemical wastewater and chemical sewage.
Ultra‐violet Spectrophotometry has been used for qualitative and quantitative analysis of water and wastewater in conjunction with appropriate signals and a deconvolution method. Application of this procedure with the use of a portable UV spectrophotometer was carried out to study treated wastewater discharge into a river. The data obtained were used to estimate dilution factors of polluted waters at different points of sampling. This simple and rapid methodology can be easily transposed with any PC‐controlled UV spectrophotometer including a multicomponent routine.
Industrial wastewater management is nowadays a reality in most industries and particularly in petrochemical ones. As a consequence, some treatment plants appear to be over designed because of waste minimization. Actually supplementary organic loads coming from incidents or external effluents have to be treated. As classical parameters or compound analyses are not well adapted, a new methodology based on the use of UV spectrophotometry is proposed. Starting from several samplesof wastewater in different points of sewage network, a procedure, called UVDIAG is used for the exploitation of the corresponding UV spectra. Some complementary measurements such as pH or conductivity can be carried out. This methodology allows a better characterization of wastewater including the detection of incidents and most often the determination of the major pollutant(s). Several months of application in a large petrochemical site located in the south of France have lead to a better knowledge of the waste production andthus to the reduction of organic load to be treated. At the same time, the company has decided to consider external wastes for treatment and to check the effluent conformity with the proposed procedure.
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