CEM - Abstract

Abstract Information :

During our study we are working to find a correlation between the type of odorous pollutants coming from different industrial sectors and the value of the olfactometric impact associated with it. This presentation will focus on sectors such as: ceramics, pet-food production, bituminous conglomerates and semi-permeable membranes, making of wooden products using recycled material, correlating the olfactometric impacts (expressed in UOE/m3) with the chemical emission imprinting in order to identify those specific makers to be measured to evaluate their impact on the territory. First, a careful study of the single industrial sector is necessary to try to identify which are the possible groups of substances to monitoring. For this reason, it’s essential to fully understand the raw materials and the transformations they can undergo at each step of the production process. In this way it’s possible hypotizing correlations between the odorous cause, the substances, and the relative concentrations of osmogenic impact. • We have noticed how in the ceramic sector, with the evolution of processes linked to digital printing, the class of compounds responsible for the odorous impact can mainly be attributed is VOCs, inside the firing klin. The presence of VOCs is mainly due to the transformation that the organic component of the raw materials (inks, glues, lustres, etc.) undergoes due to thermal degradation. • In the pet-food production, the olfactometric impact deriving from the various phases of the production process such as: cooking, hydrolysis, drying, pelletizing and depuration of process water determine the presence of both organic and inorganic substances with a high odor impact . • In bitumen industry, the production process involves the use of materials mainly deriving from the petrochemical sector, some of which are partly recycled from road works (e.g., milled from asphalt). In the production of semi-permeable membranes, recycled materials are used in smaller quantities by mixing different polymers with bitumen, determining a different odorous impact compared to that of bituminous conglomerates. In this compartment, the compounds responsible for the main effect olfactometrically are aliphatic and aromatic hydrocarbons and sulfur compounds. • In the wooden production industry several recycled materials are used, the odorous substances generated in the various stages of the production process (washing, chipping, drying, pressing, etc.) can be traced back to the organic content of the raw material and to the organic additives used in production (MF, MUF, Phenolic, PU resins), whose composition leads to the possible development of substances such as: formaldehyde, melamine, urea, ammonia, isocyanates, phenols, terpenes. The goal of this analytical process is to design an "emissive imprinting" responsible for the osmogenic impact by selecting the most representative markers of the various production processes and identifying them as sentinel controls on the territory through the use of active and passive monitoring systems such as radial diffusion samplers, canisters, adsorbent vials, bubblers with specific absorption solutions capable of measuring specific impacts in relapse.