a b s t r a c tThe article describes the partial outputs of the research focusing on alternative procedures and agents for water treatment. In this case, the possibilities are shown of using water glass and nanoiron as agents for removing heavy metals and nutrients from the water. In particular, laboratory experiments are presented simulating the processes of removing chromium and phosphorus from water. The purpose of the experiments was to show the efficiency of mentioned alternative agents when removing the pollution mentioned. The laboratory experiment was conceived as a series of jar tests as standard procedure used in connection with the control and optimisation of the coagulation process. Laboratory processes were carried out with model water whose main component was raw water from a surface water source enriched with a previously given concentration of selected pollution -chromium and phosphorus. During the experiments, the dependence was determined of the removal of the given pollution on the dose of the agent and simultaneous search for the optimal dose while applying water glass and/or nanoiron as innovative agents.
This paper outlines one possible approach to the comprehensive technical audit of water distribution networks. Based on practical experience, discussions with domestic and foreign operators, and knowledge gained from international projects, the paper proposes technical indicators, methods for their determination and criteria for evaluating the values reached by these indicators. The proposed procedure is based on the FMEA (Failure Modes Effects and Analysis) method, used in the general theory of risk analysis. The results of this method were employed to evaluate the technical condition of the water distribution network in Pilsen, Czech Republic.
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