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A four– section trickle biofilter was constructed for experimental research. The filter was filled with the packing material of artificial origin. The material consists of plastic balls having a large surface area. The dependence of biofilter aerodynamic resistance on supply air flow rate and the number of filter sections was determined. The aerodynamic resistance of the biofilter was measured in two cases. In the first case, the packing material of the filter was dry, whereas in the second case it was wet. The experimental research determined that an increase in the air flow rate from 0.043 m/s to 0.076 m/s causes an increase in biofilter aerodynamic resistance from 30.5 to 62.5 Pa after measuring four layers of dry packing material. In case of wet packing material, biofilter aerodynamic resistance after measuring four layers of plastic balls increases from 42.1 to 90.4Pa. Article in Lithuanian. Lašelinio biofiltro aerodinaminio pasipriešinimo tyrimai Santrauka.Eksperimentiniams tyrimams atlikti sukonstruotas keturių sekcijų lašelinis biofiltras. Filtras užpildytas dirbtinės kilmės įkrova, sudaryta iš didelį paviršiaus plotą turinčių plastikinių rutuliukų. Naudojant įkrovą, skirtą introdukuotų mikroorganizmų asociacijoms kultivuoti, nustatytos biofiltro aerodinaminio pasipriešinimo priklausomybės nuo tiekiamo oro srauto greičio ir sekcijų skaičiaus. Biofiltro aerodinaminis pasipriešinimas matuotas dviem atvejais: esant sausai ir sudrėkintai įkrovai. Nustatyta, kad didinant tiekiamo oro srauto greitį nuo 0,043 iki 0,076 m/s, įrenginio aerodinaminis pasipriešinimas išmatavus keturis įkrovos sluoksnius padidėja nuo 30,5 iki 62,5 Pa tuo atveju, kai įkrova sausa, ir nuo 42,1 iki 90,4 Pa,– kai įkrova sudrėkinta. Raktiniai žodžiai: lašelinis biofiltras, aerodinaminis pasipriešinimas, mikroorganizmai, įkrova.

The experimental investigations were carried out, using the biofilter BIOF-I with the system of III cleaning stages, loaded with charge, composed of zeolite granules, wood chips, barks and foam, as well as the biofilter of II cleaning stages BIOF-II, loaded with the mixture of zeolite and wood barks. When mixing the zeolite granules with wood barks for air cleaning from xylene, not only biological, but also adsorptive air treatment method is used. Applying the complex cleaning technologies, the effectiveness of equipment cleaning as well as the life cycle of charge is improved. Cultivating the associations of spontaneous microorganisms in the charge, the dependence of cleaning efficiency of biofilters on the concentration of supplied pollutant and the speed of air flow was determined. When cleaning air from xylene with the initial concentration of pollutant equal to 120±5 mg/m3, the efficiency of filters BIOF-I and BIOF-II was 94 %. The air cleaning efficiency of biofilters increases, when reducing the speed of supplied polluted air flow. In case of reducing the air flow speed from 0.3 to 0.1 m/s, the efficiency of biofilters BIOF-I and BIOFII increases from 75 to 83 % and from 75 to 84 %, respectively.