## 1 Introduction  
The biomass of phototrophic microorganisms continues to be actively considered as a renewable resource that can be effectively used to produce various commercially significant products [1; 2; 3]. Unlike lignocellulosic-containing waste, microalgae and cyanobacteria biomass does not require delignification before its deep conversion into biofuels [3; 4; 5; 6], organic acids [7], compounds useful for the chemical synthesis of biodegradable polymers, commercially significant polysaccharides [8; 9], etc. Commercial production of microalgae biomass is often limited by its relatively low cell productivity per unit volume in comparison with the growth rates of bacterial cells used in biotechnological processes [10]. To increase the economic profitability of the processes of obtaining and processing biomass of phototrophic microorganisms, they can be cultivated using wastewaters with different contents. The cell biomass cultivation can be combined with wastewater treatment and purification [3; 11; 12; 13]. The prospects of using microalgae for the treatment of wastewater of different compositions are due to the flexibility of their metabolism, which allows these cells to use inorganic and organic carbon sources, as well as their mixture. This allows the use of microalgae in the treatment of municipal, agricultural and industrial wastewater in various contexts, including tannery, textiles, paper, pharmaceuticals, food (coming from the production of tofu, dairy products, confectionery and alcoholic beverages, etc. ), pig farms, etc. [14; 15; 16; 17]. Among the wastewaters to be treated, those that contain organophosphorus compounds (OPCs) are often found in agriculture and chemical industries related to the production of pesticides. Usually, undecomposed residues of OPCs enter water systems and drains [18]. Perfluorocarbons (PFCs) are also actively used in industry, for example, in the production of cookware with non-stick coating, in water-repellent coatings in clothing and packaging, in fire-fighting equipment as well as in lubricants with a wide range of applications [19]. Due to their chemical and biological inertia, PFC enter the environment with waste and wastewater, where they can stay for a long time and gradually accumulate [20; 21]. In contrast to OPCs, the presence of PFCs in river ecosystems is a relatively new problem for the environment [17], as it has been established that only some mycelial fungi and bacteria (mainly of the genus _Pseudomonas_) are able to decompose PFCs [19; 22]. To date, the simultaneous presence of OPCs and PFCs has been determined in municipal wastewater [23; 24; 25], while their cumulative toxic effect on the human body has been noted [26]. Microalgae are common participants in natural consortia in various aquatic environments [27]. Therefore, when studying the possible influence of xenobiotics on living systems, they represent promising model objects. Today, the metabolic activity of microalgae and cyanobacteria in the presence of xenobiotics is being actively investigated due to the fact that toxic pollutants can be used by these microorganisms as sources of biogenic elements. Such widespread phototrophs as cyanobacteria of the genera _Nostoc_ and _Arthospira (Spirulina)_, as well as microalgae of the genus _Chlorella_, can use OPCs as a source of phosphorus [28; 29], released under the action of enzymes present in bacterial cells capable of degrading OPCs and, as a rule, coexisting under natural conditions with microalgae and cyanobacterial cells. To estimate the possibilities of implementing such coexistence, artificially created microbial consortia can be investigated. Some PFCs and their derivatives belong to substances with a gas transport function, for which it is known that they actively carriage oxygen [30]. It is already known that the presence of chemically synthesized substances with a gas transport function in liquid media contributes to the accumulation of increased concentrations of microbial cell biomass [31; 32].