جستجوی مقالات مرتبط با کلیدواژه « فیلتر زیستی » در نشریات گروه « شیمی »

Any change in food that reduces its quality value or reduces its popularity and marketing is called food spoilage. Ethylene gas is one of the gases produced from ripe fruits that causes high ripening and spoilage of the fruit during storage. Solutions have been suggested to absorb this gas during fruit storage. The aim of this study was to apply bio-filters to remove ethylene gas to increase the life of banana fruit after harvest during storage. Various samples prepared from agricultural wastes containing natural environmental microorganisms were evaluated in biological filters designed to remove ethylene gas and prevent spoilage of banana fruit compared to control samples. The gas chromatograph showed that the amount of gas passing through column 4, which contained peat soil substrates, poplar wood chips, enriched organic substrate, leaf soil, straw and creamy organic fertilizer was equal to 0.6528 ml of ethylene per liter of air. It had the highest ability to remove ethylene gas compared to other columns and showed a significant difference with the control sample. In addition, this filter was observationally effective in terms of shelf life of immature bananas compared to control samples, and biological filters containing Pseudomonas putida have the highest amount of ethylene gas absorption. Based on the findings, the use of biological filters is recommended to increase the shelf life of fruits in storage.

In recent years biofiltration has been attended as an alternative method for the treatment of polluted air stream instead of traditional processes. Although temperature is a key factor in this process, biofiltration modeling based on the temperature effect on the reaction kinetics has been rarely considered. In this contribution, a dynamic mathematical model has been presented which takes into account the dispersion in gas phase, diffusion in biofilm, temperature effect, and potential of oxygen limitation in reaction kinetic. Model was calibrated and validated by using an experimental data in which the effect of temperature, intermittent and continuous loading on the biodegradation of n-hexane vapor was investigated. Results showed that model well predicted experimental data at intermittent loading in the temperature range of 30-35°C and continuous loading in the temperature range of 35-40°C. Sensitivity analysis showed that at high inlet loads, decreasing bed temperature may change the rate limited biodegradation to the diffusion limited and a part of biofilm become inactive.