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The feasibility of using Lemnoideae as treatment agents from nitrogen compounds during treatment of circulating water win CWS is justified in the work. The intensity of transformation of nitrogen compounds in the application of nitridenitrification is limited by the relatively low rates of nitrobacteria metabolism, sensitivity to pH fluctuations, competitive relations with heterotrophic biota of biofilters-nitrifiers. Assimilation of ammonium nitrogen by plants occurs in the process of their growth, so the intensity of water treatment will be determined only by the rate of growth of plant biomass in phytoreactors. The artificial lighting system of the phytoreactor allows, regardless of the presence and level of natural insolation, to provide the necessary effect of removal of nitrogen compounds and other biogenic elements. The expediency of using various types of lamps for lighting of the phytoreactor with Lemnoideae is investigated. The dependence of the growth of plant biomass on the duration and intensity of lighting by different types of lamps is determined. The time of plant doubling during cultivation in contaminated circulation water in CWS is 4.5–6 days with the lighting duration within 4 hours to 2–2.5 days with the lighting duration within 14–16 hours per day. It is also confirmed that the lighting intensity is important for the growth rates of Lemnoideae. When fluorescent lamps are used, the rational limits for the lighting intensity of the phytoreactor surface are 6500–6650 lux. The treatment power by nitrogen of the phytoreactor with Lemnoideae in the specific biomass of plants in the range of 4–6 kg/m 2 is 9.6–14.4 gN/(m 2 ·day). Based on the obtained results, it is possible to calculate the required area of the phytoreactor and the power of the lighting system, depending on the load on the biological treatment facilities for ammonium nitrogen

Treatment of recirculating water of industrial fish farms in phytoreactor with Lemnoideae