In the thesis we discuss small waste water treatment plants (WWTP) up to 2000 PE and we focus on the comparison of different types and strive to extract the best available options for Slovenian users. While different types of WWTP operate on different principles, the particularly important point of use are the enviromantal and economic aspects. In this regard, the most effective are shown to be plant and lagoon WWTP, but their use is limited by the spatial and capacity aspects. If these restrictions are not problematic, plant and lagoon WWTP are representing a solution, that doesn't require complex executable part, high investment costs and electricity for operation and at the same time does not constitute interference in the landscape environment.
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