Solar Drying of Fruits and Vegetables

Authors: Y. Baradey, M. N. A. Hawlader, A. F. Ismail, M. Hrairi, M. I. Rapi

Abstract— Drying is a water removal process from foodstuffs commonly used for preservation and storage purposes. Fruits and vegetables are the most important products in agriculture sector. As its contents of nutrition are very high, it has to be preserved. Keeping the products fresh is the best way to maintain its nutritional value. There are many methods for this preservation, but drying process is the most common method of food preservation because it increases the storage life. The moisture content in these products reaches, in some cases, more than 90%. Water content is considered the main reason for microorganisms’ growth which leads to putrefaction. In this paper, the performance of a solar dryer for fruit and vegetables, using both natural and forced convection solar dryer, was investigated and compared. Drying rate, weight losses, and removal of moisture content have been studied and analyzed. A comparison between natural and forced convection solar dryers has been done.

Keywords— Drying, Solar Energy, Natural Solar Drying, Forced Solar Drying

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Removal of Manganese from wastewater by using Micellar Enhanced Ultrafiltration

Authors: Jyoti S. Sangle, K.V. Marathe

Abstract- Micellar Enhanced Ultrafiltration (MEUF) was used to remove Mn2+ from wastewater efficiently. 10 kDa Polysulfone membrane was used to obtain 97% rejection. The effect of some important parameters were investigated, including operating time, feed flow rate, surfactant to metal (S/M) ratio, feed concentration, pH. The effect of anionic surfactant on the efficiency of Mn2+ removal was also studied. The influence of input variables on permeate flux and rejection efficiency of Mn2+ ion without surfactant (anionic), in presence of surfactant was studied. Distribution coefficient and micellar loading were also estimated to confirm the reproducibility of the results.

Keywords- MEUF, Managanese, SDS, S/M ratio, Waste water

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