CONSTRUCTION OF A SOLAR BOILER-DRYER FOR PROCESSING RESTAURANT FOOD WASTES FOR THEIR USE AS INGREDIENTS IN ANIMAL FEED

We examined various methods of solar drying of restaurant leftovers. O pen air as well as forced air drying gave bacteriologically inadequate products. We therefore constructed a solar boiler-dryer working at 10 5-degrees-C. To prevent the observed heating to higher temperatures at the later stages, drying was extended to two days. While sterilizatio n and removal of most of the water are achieved by boiling in the sola r boiler-dryer on the first day. open air drying on the second day all owed us to obtain a light brown, colored product with trace amounts of bacteria and mold. The energy efficiency for vaporization was 85%. He at losses of the whole dryer due to reflection, convection, and radiat ion were calculated to be 13%, 7%, and 20%, respectively. The product obtained from the mixture over five successive days had a composition close to recommended values for chicken feed (e.g., broiler).