Michał Zielina

Cementation of iron water and sewage pipes is a standard procedure that is used to ensure internal protection against corrosion. In order to reduce leaching of chemical elements from coating to water, the neutral impact of cement coating on the water is of major importance. In the present study, the elemental composition of the cement mortar lining, taken from the new cast iron pipes with a diameter of 100 and 150 mm, has been investigated. A reference sample was made from Portland cement. Studies using scanning electron microscopy revealed an increased contents of titanium in the sewage pipes coating and also aluminum and alkali in water pipe coatings.

A classic example of the application of electron-dispersive spectroscopy (EDS) is the observation of the microstructure of solid samples using scanning electron microscope (SEM). This provides the possibility of taking measurements of chemical composition in very small areas. Measurements can be performed on any bulk sample through adjusting the X-ray excitation parameters to the elements of its expected composition. Examples of the applications of the EDS technique in the context of environmental engineering have been presented.

The article presents the results of numerical calculations performed in a computer software. The simulations concern water flow through an intake screen. This kind of screen can be used in surface water intakes. Thanks to the small inlet velocities and a small mesh size, the screen does not pose a threat to ichthyofauna.

The article presents the problem of ichthyofauna protection in aquatic ecosystems. One of the possible solutions to protect the fish and fry in the water intakes is the use of properly designed water intake screens. The article presents the results of numerical calculations performed in Autodesk Simulation CFD software considering the performance of water intake screen under various conditions.

In the paper the results of experimental research on the deterioration of drinking water quality after cement mortar lining were presented. The experiments were conducted in the renovated water pipeline section in Cracow. Based on the results, the expected degree of leaching of the pollutants from cement mortar to drinking water for specified lengths and diameters of renovated pipes, as well as water velocities, was estimated.

The paper presents laboratory experiments on the influence of different hardness water samples collected from the municipal water supply system on the intensification of leaching pollutants from the internal cement mortar pipe lining to drinking water. The paper presents the analysis of water quality indices, such as pH, aluminum and selected heavy metals concentrations after contacting with cement coatings.