When a malfunction in the collection system occurs and a pipe overflows, the wastewater may be discharged in the natural environment. To avoid such pollution, nuisances to inhabitants living nearby and extra cost for the operator, there is an issue of detecting early enough the buildup of obstructions in sewerage pipes in order to react before the damage is done. The aim of this thesis was thus to develop a decision support tool to detect obstructions and to optimize cleaning operations. Some additional specifications were the file size for sending by email, the simplicity of setup and use, the visual attractiveness and a quick visualization of results. The tool consists of two Excel files coupled with a database which permits to send a daily email to the operator with the functioning state of each measurement point. However, the tool does not do everything, human analysis is necessary to have a critical eye on the results and to decide when to trigger a cleaning operation. The main perspective at the end of this thesis is the replacement of the preventive cleaning operations that were previously performed with a fixed frequency per year by conditional cleaning operations triggered by the tool and to observe the decrease of cleaning operations. Other perspectives are to spread the tool to other sites and to use the received feedbacks to adjust the different parameters and eventually to determine an automatic trigger condition of cleaning operations.

Рассмотрены существующие методы проведения операции чистки оптических поверхностей с целью удаления с нее всех загрязнений и создание необходимого состояния поверхности. Приведены результаты измерения краевого угла смачивания, который позволяет проанализировать, какие свойства обретает поверхность после чистки. Описан комплекс измерительного оборудования для определения угла смачивания поверхности жидкостью. / The existing methods of carrying out the operation of cleaning optical surfaces in order to remove all contaminants from it and create the required surface condition are considered. The results of measuring the contact angle of wetting are given, which makes it possible to analyze what properties the surface acquires after cleaning. A set of measuring equipment for determining the angle of surface wetting with a liquid is described.