Introduction: Biological wastes represent a major environmental problem and, due to the content of food waste, it is also a social issue. In recent years, interest in monitoring quantities and the composition of biological waste has increased dramatically. The purpose of this monitoring is to optimize the handling of biological waste at domestic and international levels, as well as finding ways to prevent and reduce the emergence of food waste, on the basis of quantities and composition. Purpose: The purpose of the master's thesis is to obtain data on the amount of waste food produced in the dietary care of patients in the University Medical Center Ljubljana and to estimate the costs of this waste. We monitored separately the food remains that are produced in the central kitchen (excess food) and the amount of discarded food that returned from wards. Method: For the period of seven consecutive days, the weighing method was used to determine the amount of unserved food, the amount of returned uneaten bread and the amount of dehydrated discarded food. We compared the amount of disposed food with the quantities of prepared and served food. Results: In the observed period, one third of the prepared food in the hospital was discarded, ranging from 19 to 54%. The total amount of waste food prepared by the University Medical Center Ljubljana was mostly affected by discarded serviced food, by 29.8%. Within that amount, 7.1% of food was completely intact. To a lesser extent, the total amount of waste food was influenced by the amount of food that was not distributed, by 4.8%. 23% of served bread was returned from wards during this period (range 14 to 30%). In the analysed period in University Medical Center Ljubljana, the cost of disposed food represented 32.6% of the value of food used for meal preparation. Discussion and conclusion: The comparison of data on the amount of waste food indicates that University Medical Center Ljubljana, in comparison with the hospitals across Europe, discards a smaller amount of this waste. The amount of waste food is difficult to reduce due to various factors that occur in the hospital system. Through the results obtained and the proposed measures presented in international literature, we present short-term and long-term measures that could reduce the amount of waste in University Medical Center Ljubljana by 42%.
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