COD and TPH analysis in slops experimental treatment plants: analytical problems.

Risultato della ricerca: Other

Abstract

COD AND TPH ANALYSIS IN SLOPS EXPERIMENTAL TREATMENT PLANTS: ANALYTICAL PROBLEMS.In the last years, the persistence and accumulation of xenobiotic compounds in theenvironment created many disposal problems of oily wastewater generated byships, mainly in engine-rooms (bilge waters) and by cleaning of tanker (slops).The high salinity levels (up to 25.000 mgL-1) and the pollutants concentration,both limit the chances of discharge into the sewer systems and address thedisposal of these wastewaters to the sea. For these reasons it is necessary to treatsuch wastewater efficiently before discharging [1]. As a part of a broader projectconcerning slops treatments, this work addresses issues related to the analyticalmethods of the COD and TPH parameters, chosen under the provisions of ItalianLegislative Decree 152/06, that implements the European directives onenvironmental protection. In the COD analysis the greatest difficulty was the highsalinity levels corresponding to high chlorides levels. Chlorides cause a positiveinterference in the measurement, and this interference during the analysis of CODwas investigated at various concentrations of mercury in order to try to minimizethe use of this reagent that causes many problems of safety and disposal, and atdifferent times reaction [2][3][4]. The major problems in TPH analysis concernedcorrect setup of the gas chromatographic separation, high variability in samplecomposition and the high capacity of the sample to form emulsions during theliquid-liquid extraction procedure.This paper reports the results of the analysis of COD and TPH and the problemsrelated to the development of a suitable analytical method for the analysis of thesespecimens.This study is part of STITAM European project, created with the aim to developinnovative technologies for the treatment of liquid wastes of navigation, in orderto better safeguard marine environment.[1] G. Mancini, S. Cappello, M.M. Yakimov, A. Polizzi, M. Torregrossa,Chemical Engineering Transactions 27 (2012) 37-42.[2] I. Vyrides, D.C. Stuckey, Bioresource Technology 100 (2009) 979–982[3] Alexandra M.E. Viana da Silva, Ricardo J.N. Bettencourt da Silva , M.Filomena G.F.C. Camoes, Analytica Chimica Acta 699 (2011) 161– 169[4] D.D.C. Freire, G.L. Sant’anna jr, Environmental Technology 19 (1998) 1243-1247
Lingua originaleEnglish
Pagine324-324
Numero di pagine1
Stato di pubblicazionePublished - 2015

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