Review article

The article presents the results of the study investigating the process of reducing the performance of sheet membranes during operation in membrane bioreactor mode and post-treatment of wastewater mode. The study was carried out by means of filtering real samples of wastewater at the laboratory installation. Basing on the results obtained, there were revealed mathematical regularities witnessing the decrease in membrane productivity depending on the incoming load of pollutants and the level of trans-membrane pressure. The authors have worked out some recommendations for calculating the duration of membrane functioning. The results of the study can be applied in the design and reconstruction of treatment plants to predict the appropriateness of using the membrane installations.