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Unsuitable feed water quality causes fouling and serious decrease in membrane permeability during the operation of reverse osmosis filters, which leads to costly operation and low contaminant removal efficiency. The purpose of the experiment was to create a detailed, yet simple calculation scheme, suitable for higher education and everyday pilot experiments. The obtained formulas were calibrated against measured results, while investigating the fouling of the membranes at different iron concentrations. Pressure losses on a reverse osmosis equipment with a permeate capacity of 100 L/h were investigated for almost a year. Changes in permeability and cleaning methods were investigated with different feed water qualities.

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flow with the trans-membrane pressure. Three 8-h process runs were carried out at 1.5 bar, and an additional run at 0.5 bar was conducted for 25 h. In all test runs, the permeate of the UF module (i.e. the enzyme-free product) was withdrawn from the

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