Summary:

The character of development of rural settlement units imposes the need for searching each time for optimal solutions with regard to sewage systems, including wastewater treatment plants. One may take into account household (local) treatment plants as well as the treatment plants that serve several or dozen households located close to one another within the compact, dispersed or open development. During this process one should not overlook the necessity for building collective wastewater treatment plants which consist one of the elements of collective sewerage system. The article presents technological, technical and economical aspects of the above-mentioned solutions which allow to choose optimal solutions for specified size and development of rural settlement units. Apart from its scientific character, the paper has also applicable value as it enhances decisions about choosing proper solutions of wastewater sewage systems at rural areas.