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In this study, the antibacterial effect of eucalyptus extract on different bacteria showed that the bulk of compounds present in the sap of eucalyptus leaves were formed by the phenolic compounds. starch was prepared for the production of starch film was used to improve the quality of film by 10 % of the volume of glycerol. ground beef production was evaluated by adding 0.5 and 1.5 percent of eucalyptus oil to the film, then ground mutton meat was packed with film, and microbial and chemical properties and transparency of meat after preservation in the fridge were studied in times 1, 3 and 6 days. according to the results, inhibition of DPPH increased with an increase in the amount of extract and the highest percentage was reported on day 3. also the results of TBA with a decrease in the amount of extract decreased and the maximum reduction rate was reported on day 3. according to the results, the total population count of microorganisms decreased with an increase in the amount of extract and the maximum reduction rate was reported on day 3, but did not have significant differences with the sample count on the day 6 with the spread of corruption. (P> 0.05) is based on the results that Staphylococcus aureus has decreased by increasing the amount of extract and the maximum reduction rate is reported on day 3. However, on the day 3 at 0.5 % extract, its extracts and on the day 6 with the spread of corruption, the number of samples did not show significant differences. according to the results, the amount of transparency and color spectrum decreased with the increase of the extract and had significant differences with the sample (p < 0.05). [ABSTRACT FROM AUTHOR]

Background and Objective: Access to safe water is critical for protecting human health. Turbidity is one of the main physical parameters that affect the quality of water from both health and aesthetical points of view. Therefore, waters should be treated based on the standards set for turbidity before consumption. This study was performed to determine the performance of a bench-scale baffled filter system for removing the turbidity, microbial population, and total organic carbon (TOC) from the contaminated water. Materials and Methods: A lab-scale Plexiglas baffled filter consisting of five compartments with a total working volume of 2 L was designed and constructed. The polyurethane foam cubes were used as filter media. The effect of turbidity (10, 50, and 100 NTU) and surface overflow rate (SOR: 7.5, 10 and 15 m/h) was investigated on the performance of the developed system. Results: A direct relationship between turbidity, TOC, and microbial density was observed in the inlet water. The efficiency of the baffled filter in the removal of turbidity and the period of the filter operation run both enhanced as the SOR was either decreased or the inlet turbidity was increased. In addition, almost complete removal of TOC from the inlet water was noticed. Conclusion: The results of the present study indicated that the baffled filter system with sponge media can be a novel and effective method for the removal of turbidity, microbial contaminants and TOC from the natural surface water. [ABSTRACT FROM AUTHOR]