The third era in olive oil extraction sees a new generation of decanter that give the operator the possibility to chose time by time the type of working: two or three phase shifting from one solution to the other without stopping the machine and even intermediate solutions between two or three phase, making the most suitable adjustments, following olive variety, just as the machine works. A decanter centrifuge was employed during the experimental tests with variable differential speed between bowl and screw conveyor (Dn) and with regulation capability of oil-pulp ring levels. Thus permit to shift from three to two phase, reducing water added and discharging the following by-products: dehydrated husk similar to that of three-phase and recovers a wet pulp that is the between the liquid phase and the solid phase. This paper aims to report the preliminary results of the energy and functional efficiency of the decanter when it works in the industrial scale plant and using a continuous method. The trials were carried out at two different flow rate values; for each flow rate the different variable differential speed between bowl and screw conveyor was varied at 15,50, 17,50 and 19,50. Quality olive, operating speed of the crusher machine and relative feed flow rate of the machine, the malaxing time and the degree of dilution of the paste, as well as the oil-pulp ring level were the same for all the trials. Irrespective of the flow rate and Dn used, the machine tends to stabilize energy consumption in a very short time and values were quite similar to each other. The reductions in flow rate do not involve reductions of energy consumption indeed lead to the increase of absorption per unit mass of product worked. For all thesis studied, no significant changes of the oil recovery efficiency were found, indeed changing the flow rate and the Dn a different distribution of the not extracted oil was found in the pulp and in the husk. To complete the knowledge, a set of trials changing also the oil-pulp ring levels, has been provided for the next olive oil season.

Nella presente nota si riportano i risultati di uno studio mirato all’analisi del campo elettrico generato da Stazioni Radio Base posizionate su terreni agricoli allo scopo di valutare l’esposizione degli operatori durante le lavorazioni di campo effettuate in aree ad esse circostanti. Per il rischio degli operatori si fa riferimento ai limiti di esposizione ed ai valori di attenzione (per permanenze non superiori alle quattro ore) riportati nel D.P.C.M. 08/07/2003 Art. 3 ovvero, per le frequenze a cui operano le SRB di telefonia cellulare, rispettivamente 20 V/m e 6 V/m. Sulla base dei risultati ottenuti, si può affermare che esiste effettivamente un pericolo per la salute degli operatori che compiono lavori in prossimità di SRB per telefonia cellulare per un periodo superiore alle 4 ore; tale rischio, però, si riduce sensibilmente e diviene accettabile considerando le effettive condizioni di funzionamento delle Stazione Radio Base, notevomente inferiori a quelle nominali.

The electromagnetic field (EMF) levels generated by mobile telephone radio base stations (RBS) situated on rural-agricultural lands were assessed in order to evaluate the exposure of farm workers in the surrounding area. The expected EMF at various distances from a mobile telephone RBS was calculated using an ad hoc numerical forecast model. Subsequently, the electric fields around some RBS on agricultural lands were measured, in order to obtain a good approximation of the effective conditions at the investigated sites. The viability of this study was tested according to the Italian Regulations concerning general and occupational public exposure to time-varying EMFs. The calculated E-field values were obtained with the RBS working constantly at full power, but during the in situ measurements the actual power emitted by RBS antennas was lower than the maximum level, and the E-field values actually registered were much lower than the calculated values.

In this note the experimental results of an analysis of the electromagnetic fields present in the productive area of new built oil-mill, placed in Bari district, considered representative of the majority of such a kind of the workshops in the Apulia region, are reported. Introductory study's purpose has been evidently to evaluate the exposure level of the workers during an oil production activity, inside a typology of transformation systems much spread on the Apulian territory that, even though with seasonal character, gives occupation to a big number of operators. Results of the tests highlight that inside the considered oil-mill there are not electromagnetic pollution risks for the operators during the period of maximum use of its productive capacities.