The article is devoted to the study of available information about identification of groups of antibiotics in urban wastewater. At the same time, results of research conducted in Tunisia, Spain, the United States, China and other countries were examined. The comparison showed that wastewater contains a specific set of antibiotics of a country, which is aroused by special veterinary medicine and pharmaceutical industry in the country. However, there are common antibiotic types of urban wastewater in all countries, because of their high applicability and effectiveness of treating bacterial infections. The question of learning the composition of urban wastewater in Russia remains unstudied.

This article presents the test results of the laboratory flotation equipment LFM–001 for the treatment of simulated wastewater with a high content of oil products and surfactants. To obtain a water–air mixture, tap water with a volume of up to 40 dm3 was used, through which air was passed, with a volume till 5% of the water volume. The size of the resulting bubbles was determined by the pressure established in the aeration tank before the tests and by the flow rate of the air-water mixture in the flotation machine. After a series of tests, in series where a water–air mixture was added to laboratory containers with simulated wastewater, oil particles formed flakes in the presence of a coagulant. These flakes, together with air bubbles of the air–water mixture, floated to the surface of the container and formed a foamed, oily layer 5 mm thick. At the same time, the water in the laboratory vessel, after passing the air–water mixture became more transparent visually than water in other laboratory vessels.

This article presents different aeration systems for biological wastewater treatment, their classification, also advantages and disadvantages of the most common aeration methods - pneumatic and mechanical are described. Also, proposals to reduce the energy consumption of aeration systems by maintaining the optimal range of dissolved oxygen concentration at different points of the aeration tank, depending on its type, have been prepared.

The article discusses the use of mathematical modeling and system analysis methods to solve problems of water preparation. Models for predicting indicators of drinking water based on the quality of the source water are proposed. The technological process of deodorization of drinking water is considered. The following system analysis methods were used in the models development: correlation analysis of data, the principal component method, regression modeling, and the least squares method. Hidden relationships between indicators of drinking and source water were identified. The adequacy of the obtained results was proved by comparing them with the actual values. The obtained results approximate well the actual values. The results can be used in water supply systems to improve the quality of drinking water.

This article presents the test results of the laboratory flotation equipment LFM-001 for the treatment of model wastewater simulating sewage dairy production. To simulate effluents, 200 ml of goat milk was mixed with 4800 ml of tap water, which made it possible to obtain a chemical oxygen demand of 2000 mg/dm3. For each test, simulated drains were mixed in different proportions with the air-water mixture obtained in LFM-001 and tap water. To intensify the flotation processes, we used the coagulant Aqua-Aurat with alumina A12O3 and the flocculant Praestol of various modifications.