Monitoring Noxious Substances From Combined Feed Factories for Environmental Protection

Compound feeds are an important source of food for the animals from zootechnical farms, because in addition to ground cereals they also contain vitamins, minerals, proteins, amino acids, and sometimes even drugs, energizers, or flavors. The process of obtaining different varieties of compound feeds involves a complex technological flow, with specific stages of production. Mixing, sterilization, and granulation activities, where steam jets are used at very high temperatures, determine the elimination of different types of noxious substances in the air. This article presented the experimental measurements performed at the critical points of working installations from a compound feed factory, on the entire duration of the assortment lot. Considering the purpose of the performed researches, the critical measurement points were established at the exit of steam generator, where steam jets are obtained at very high temperatures, with values of approximately 150-180 °C. Using a TESTO 350 M/XL gas analyzer, the measured values allow a complete analysis of the types of noxious eliminated. The results of experimental measurements show that the fluctuations obtained during the measurements are very small, of the order 2 mg/m 3N for each type of noxious eliminated, which indicates a very good regulation of the work process. The average values of the eliminated noxious substances, CO, NO x , CO 2 indicate compliance with European environmental quality standards. The use of high-performance instalations, with a high degree of automation allows rigorous control over the different types of pollutants released into the atmosphere by the work installations from compound feed factories.