Abstract
Pollution resulting from increased human activities is threatening Lake Victoria, its effects are characterized by eutrophication, high turbidity, pH, iron(II) concentration and chemical oxygen demand (COD). In this study we have investigated the effect of Fe-montmorillonite clay from Chelel on turbidity, pH, concentration of iron, total suspended soils, total nutrients and COD of water sampled from Murchison bay watershed of Nakivubo channel south of Kampala. Varying amounts of clay powder was vigorously stirred with water samples for 5 minutes, filtered using Whatman paper at ambient temperatures. The optimum concentration of clay of 0.4 gL-1 was found to produce 73.5+2% fall in COD indicating elimination of microbes and organic waste. The pH of water became 6.3+ 0.2 showing that impurities had been bound to clay. The TSS and nutrients in MB water also decreased greatly when clay was stirred with water at ambient temperatures. The available data can be relied on to recommend use of this clay in treatment of waste water and/or sewage from Kampala. Further studies on combined use of clays with alums, zeolites and/or lime need to be carried out.
Highlights
Higher education should cultivate students’ innovation and entrepreneurship, and take “practical teaching” as a key link in deepening teaching reform [1]
Experiment teaching is an effective way to carry out comprehensive chemical education [2,3,4,5]
The teaching contents of traditional experimental teaching still remain at the verification or strength of theoretical knowledge [6]
Summary
Higher education should cultivate students’ innovation and entrepreneurship, and take “practical teaching” as a key link in deepening teaching reform [1]. This “standardized” teaching mode is difficult to provide students with space and time for thinking and practice, and it is not able to stimulate their interest in active participation. This seriously restricts the formation and improvement of practical ability and innovative consciousness. Fluidized bed drying is an important experimental project in chemical engineering experiments. In order to convert the experiment into design and research type, and compare it with the well-known fixed bed (oven) drying, the research integrates three independent basic experiments into an organic whole by improving the experimental device, screening the drying materials and integrating the fluidization curve measurement, fixed bed drying and fluidized bed drying.
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