In the case of limited access to a light it changes the mode of feeding and begins collecting nutrients from the environment (Fujita et al., 1999). Under conditions conducive to photosynthesis it behaves like a typical plant. arrhiza to water purification has received only a little attention. for pollutants removing from different kinds of wastewater is well known for many years (Sutton and Ornes, 1977 Vermaat and Khalid Hanif, 1998), but an applicability of W. The use of duckweeds, including Lemna and S pirodela spp.

For this purpose are used higher terrestrial plants ( Salix viminalis L., Populus deltoides), wetland plants ( Phragmites australis, Typha latifolia, Schoenplectus lacustris, Sparganium ramusom, Glyceria aquatica, Iris pseudoacorus and species of the Carex family, as well as Myriophyllum spicatum, Apium nodiflorum (L) and aquatic plants of the genus Lemnaceae (Adhikari et al., 2015 Appenroth et al., 2015 Obarska-Pempkowiak et al., 2010). Plants used for phytoremediation are characterized by a rapid increase in biomass and tolerance to a variability in a composition of treated water or soil as well as a high content of salt, phosphates and nitrogen (Justin et al., 2010). Additional benefits of phytoremediation is biomass which can be used for the energy, paper or charcoal production, reduction of CO 2 emission, erosion control and improving of an attractiveness of a landscape. The use of plants for wastewater purification is most useful in countries with warm climates, and in view of its advantages seems to be an ideal solution for developing countries (Zhang et al., 2014). Due to its high removal efficiency, simple operation, low cost and great potential for water reuse this method of purification have become a popular option for wastewater treatment (Kadlec and Wallace, 2009). The use of plant organisms in constructed wetlands for wastewater treatment meets all requirements of 'green' purification processes. arrhiza shows its good acclimation to high pollution of aquatic environment. Analysis of biochemical components, stress markers and antioxidant activity in W. arrhiza was better than obtained with the use of Lemna minor, which is wide used in constructed wetlands, and not much worse than those obtained in conventional Wastewater Treatment Plant (WWTP). Purification efficiency of non-treated municipal wastewater with W. The significant removal of nutrients (75–78%) and reduction of oxygen demand (93–97%) was achieved during cultivation of W. arrhiza in real effluent wastewater was similar to those with laboratory-made solutions. arrhiza cultivation on artificial growing medium was between 78.9 and 99.7%. The reduction of phthalates concentration observed during seven days of W. The eight most frequently detected phthalates were considered: dimethyl (DMP), diethyl (DEP), dipropyl (D nPP), dibutyl (D nBP), diisobutyl (DIBP), bis(2-ethylhexyl) (DEHP), diizoheptyl (DIHP) and diizononyl (DINP). The usefulness of Wolffia arrhiza for decontamination of waters from phthalates and other organic compounds was studied using artificial growing medium and real municipal wastewater samples.

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