engleski

Prevention of Microbial Deterioration of Additivized Waste Emulsion

Preservatives are natural or synthetic substances added to products in order to inhibit or retard spoilage (development of microorganisms). Their application can improve not only product’s shelf life by preventing microbial deterioration, but also its initial properties and appearance. Preservatives are especially important in the preservation of water-based products with biodegradable constituents. Waste emulsion for road construction was homogenized and enhanced by additives. Emulsion properties such as its appearance, odour and physical changes were observed in order to determine its stability. It was found that an additivized emulsion was susceptible to microbial deterioration only 7 days after its preparation. In this research, application of four different preservatives (sodium acetate, sodium benzoate, potassium metabisulfite and Preventol® B2) was investigated in order to prolong shelf life of an enhanced waste emulsion. Emulsions with various concentrations of preservatives were prepared and monitored daily during eight weeks for changes in appearance and odour caused by microbial deterioration. It was found that the addition of sodium benzoate and potassium metabisulfite in lowest tested concentrations (0.25 g preservative per 100 g non-additivized emulsion) was successful in preventing microbial deterioration since no changes in odour or appearance have occurred throughout eight weeks. However, detailed microbiological investigation should be obtained in order to confirm these findings.

preservatives ; microbial deterioration ; waste emulsion

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