The aim of this work is to study the immobilization ability of new composite materials based on polyethylene (PE) and polysaccharides (PS) in relation to the biocenosis of activated sludge (AS). The objects of the study were selected composite materials of the following composition: PE : pure microcellulose (MCc), PE : waste microcellulose (MCw), PE : starch (ST), at a ratio of components PE : PS = 70:30 wt.%. The objectives of the study were to determine the main morphological parameters of new composites (porosity, roughness, density), assessment of hydrochemical and hydrobiological state of AS (silt index, mass concentration of silt, species composition) until it locks into composites, assessment of the immobilization ability of the studied materials by biomass weight gain, monitoring of the state of AS after fixing. The tests found that the composite of structure of PE : MCc of has a density of 410 kg/m3 and a porosity of 60%, the roughness of 3.5; the composite of structure of PE : MCw has a density of 590 kg/m3 and a porosity of 40%, roughness of 2.0, composite of structure of PE : ST has a density of 640 kg/m3 and a porosity of 50%, the roughness of 2.5; wherein the reference sample - PE - has the parameters: density 860 kg/m3 and a porosity of 0%, roughness 0. To determine the immobilization capacity of the new composite materials, a laboratory experimental immobilizer was used, which is a container filled with 70% of the useful volume of the active sludge suspension and 30% of the floating loading samples. Immobilization was carried out under aeration conditions during 2, 4, 8, 12, 24, 48, 72 hours. As a result of tests it is established that the sample of structure of PE : MCc for 72 hours of immobilization showed a gain of biomass of the order of 12%, the sample of structure of PE : MCw - 5%, the sample of structure of PE : ST – 7%, PE – 3%. The condition of the organisms AS after fixing was evaluated by washings with immobilized samples, as a result of microscopy of washouts, the presence of living representatives of the biocenosis of AS in all samples was established, but they differ in number: for the sample of structure of PE : MCc - numerous, PE : MCw, PE : ST - average number, PE - small number. Further studies on the modification of the synthetic polyolefin matrix by functional fillers, including those from a number of polysaccharides, are of interest, allowing to increase the affinity of the carrier material with the extracellular matrix of activated sludge.

composite material, loading the biofilter, immobilization, biological wastewater treatment

1. Korchevska Y.V., Kudysheva A.A., Gorelkin G.A., Magagine A.A. et al. the Use of fluidized bed biological wastewater treatment. Vestnik Altajskogo gosudarstvennogo agrarnogo universiteta [Bulletin of Altai state agrarian University]. 2016. no. 2. pp. 67–71. (in Russian).

2. Studenikina L.N., Korchagin V.I., Shelkunova M.V., Dochkina Yu.N. et al. The Modification of polyethylene with microcellulose to increase its immobilization ability. Vestnik VGU [Vestnik VSU]. 2018. no. 3. pp. 23–29. (in Russian).

3. Markevich R.M., Grebenshikova I.A., Rodenko A.V., Vostrova R.N. Features of a biocenosis of active silt, in the free state and immobilized on the polymeric media. Trudy BGTU [Proceedings of BSTU]. 2013. no. 4. pp. 219–223. (in Russian).

4. Davletyarov R.R., Bobykin D.V. improving the reliability of the wastewater treatment system. Nauka i tekhnologii truboprovodnogo transporta nefti i nefteproduktov [Science and technology of pipeline transportation of oil and oil products]. 2013. no. 2. pp. 79–83. (in Russian).

5. Iitti Yu.V., Nekrasova V.K., Kulikov N.I., Simankova M.V. et al. Detection of anaerobic processes and microorganisms in immobilized activated sludge of wastewater treatment with intensive aeration. Mikrobiologiya [Microbiology]. 2013. no. 6. pp. 672. (in Russian).

6. Nozhevnikova A.N., Iitti Yu.V., Kulikov N.I., Zubov M.G. New technology for wastewater treatment with immobilization of the active microbial sludge and an effective removal of nitrogen with the participation of anammox-bacteria implemented on the sites of the winter Olympic games Sochi2014. Biotekhnologiya i kachestvo zhizni [Biotechnology and quality of life: International scientific-practical conference]. 2014. pp. 410–411. (in Russian).

7. Nguyen Tuan Anh, Kulkov V.N., Solopanov E.Yu. The use of synthetic materials based on polyamide fibers for intensification of biological purification of waste waters. Izvestiya vuzov. Investicii. Stroitel'stvo. Nedvizhimost' [Proceedings of the universities. Investment. Construction. Realty]. 2018. vol. 8. no. 1. pp. 168–174. (in Russian).

8. Dolzhenko L.A. Immobilization of activated sludge in the bioreactor media in the context of nitrification and denitrification. Obrazovanie i nauka v sovremennom mire. Innovacii [Education and science in the modern world. Innovations]. 2016. no. 4. pp. 150–157. (in Russian).

9. Kalashnikova M.E., Belik E.S. Investigation of methods of adsorption immobilization of hydrocarbon-oxidizing microorganisms on carbonate. Ehkologiya i nauchno-tekhnicheskij progress. Urbanistika [Ecology and scientific and technical progress. Urbanism]. 2013. vol. 1. pp. 76–84. (in Russian).

10. Chernysh, Y., Plyatsuk, L. The carrier for biofilms development on the basis of technogenic wastes for pollutants treatment in the environmental protection technologies. Lecture Notes in Mechanical Engineering Volume. Part F2. 2019. pp. 422–432.

11. Bidinger S.C., Dzedzig B. Mutag BioChip, the ultimate MBBR carrier for biological wastewater treatment. Available at: http://www.mutag?biochip.com

12. Zherdev V.N., Studenikina L.N., Shelkunova M.V. Species composition of activated sludge from VOC aeration tanks. Modeli i tekhnologii prirodoobustrojstva (regional'nyj aspekt) [Models and technologies of nature management (regional aspect)]. 2016. no. 1 (2). pp. 34–39. (in Russian).