Impact of channeled and diffuse emissions from a steel mill in the alpine context

Devis Panont, Claudia Tarricone

Abstract


Aosta is a small town in the Alps in Italy where there is a single industrial installation consisting in a steel mill that has obtained in 2007 the IPPC permit according to the 96/61/EC directive concerning Integrated Pollution Prevention and Control (IPPC). The Regional Environmental Agency of Valle d’Aosta (ARPA Valle d’Aosta) has been carried out from 2007 to 2012 a monitoring program to evaluate the environmental impact of the steel mill emissions on the adiacent urban area of Aosta. The monitoring program included ambient air measurements of PM10, metals in PM10 and atmospheric depositions of metals with a time coverage of almost 100% of the year. Sampling and analysis of the ambient air and depositions have been performed according to national and European standard methods. Critical levels of nickel in PM10 have been measured, above target value of 20 ng·m-3 provided by 2008/50/EC directive on ambient air quality. Levels of nickel and chromium in atmospheric deposition have been resulted quite higher respect to values reported in literature studies concerning other Italian towns and other European countries. Chemical characterization of particle emitted by the steel mill led to obtain a profile (“fingerprint”) of both diffuse and stack emissions of metals typical from stainless steel production: Cr, Ni, Mn, Fe, Zn. A marked correlation, in ambient air nearby the steel mill, has been found between the fingerprint of stack emissions and composition of PM10, and between the fingerprint of diffuse emissions and composition of atmospheric depositions. The results of the environmental assessment have been taken in reference within the renewal of the IPPC permit for the steel mill. Specific conditions on plants management and appropriate technical measures, according to best available techniques (BAT), have been included in the renewal of IPPC permit to prevent diffuse emissions and to reduce stack emissions from steelmaking processes. Ambient air and atmospheric depositions monitoring will be carried on in the future to evaluate efficacy of technical measures taken by the operator of the steel mill and to verify the operator maintaining the efficiency of emissions treatment systems.

Keywords


PM10, depositions, metals, nickel, steel, fingerprint

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