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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.

Air treatment biotechnologies are the most cost-effective and eco-friendly means of reducing the atmospheric emissions of ammonia and other odoriferous substances such as xylene, hydrogen sulphide, acetone, butanol, etc. The main shortcomings of the currently used biofilters are high aerodynamic resistance of a charge, complicated maintenance of humidity and operating temperature in a charge, obstruction of a biocharge with a mass of microorganisms and a big space required for biofilters. It is necessary to develop new technological solutions for rectifying the afore-mentioned shortcomings. The aim of this research is to investigate the effectiveness of a plate-type biofilter with a capillary charge humidification system. The investigation covered identification of the dependence of biofilter’s effectiveness on time, supplied pollutant concentration and velocity in a charge. As determined during the investigation, biofilter’s effectiveness became stable after 35 days of operation. When the velocity of airflow passed through the biofilter was 0.04 m/s, biofilter’s effectiveness reached 79 %.

Presents the results of experiments on the aerodynamics of dry and irrigated regular packing. Elements of the nozzle in the form of streamlined profiles. The material of the nozzle used polymer network made of Mylar filaments. The material and structure of the grid with two-way within the liquid film on its surface. Proven design elements of the regular packing can be used as an effective load of biofilters for air pollution control devices. Experimental data on the hydraulic resistance of dry and irrigated nozzle shown in the form of plots of ΔP=ƒ(Wo). the increasing load on the air Wo from 0.056 m/s to 0.870 m/s pressure drop ΔP/H dry nozzles CR-1K increase with the value of 6.0 Pa/m to 34.0 Pa/m.

In order to carry out an experimental investigation a biological air‐treatment device was used, namely, a biofilter with a charge of a different origin composed of zeolite, foam and wood chips. When mixing foam and zeolite together with wood chips for air treatment from volatile organic compounds, not only a biological but also adsorptive air‐treatment method is used. Using complex treatment technologies the device efficiency and the charge service period are improved. The investigation has shown that microorganisms, being predominant in the bio‐treatment process, can breed in charges of on inorganic origin made of natural zeolite and foam. While cultivating spontaneous microorganism associations in the charge, biofilter treatment efficiency was determined to be dependent on the sort of the supplied pollutant, concentration and filtration period. The charge filtration function was most efficient at a velocity of 0,1 m/s when the device was supplied with acetone‐polluted air. Cleaning air from acetone, when the original concentration of the pollutant was 103 mg/m3, the filter treatment efficiency reached 95%. When the concentration of pollutants supplied into the biofilter is reduced and the filtration period is increased, the device treatment efficiency increases as well. Santrauka Eksperimentiniams tyrimams atlikti buvo naudotas biologinis oro valymo įrenginys – biofiltras užkrautas skirtingos kilmės įkrova, sudaryta iš ceolito, porolono ir medienos drožlių. Poroloną ir ceolitą maišant su medienos drožlėmis lakiesiems organiniams junginiams valyti iš oro taikomas ne tik biologinis, bet ir adsorbcinis oro valymo metodas. Kompleksiškai taikant skirtingas valymo technologijas pagerinamas įrenginio valymo efektyvumas ir įkrovos naudojimo laikas. Tyrimai parodė, kad biologinio valymo procese vyraujantys mikroorganizmai gali daugintis ir neorganinės kilmės įkrovose, sudarytose iš gamtinio ceolito bei porolono. Įkrovoje kultivuojant savaiminių mikroorganizmų asociacijas nustatytos biofiltro valymo efektyvumo priklausomybės nuo tiekiamo teršalo rūšies, koncentracijos, filtracijos laiko. Geriausiai įkrova filtravo 0,1 m/s greičiu į įrenginį tiekiamą acetonu užterštą orą. Valant iš oro acetoną, kai pradinė teršalo koncentracija yra 103 mg/m3 , filtro valymo efektyvumas siekė 95 %. Mažinant į biofiltrą tiekiamų teršalų koncentracijas ir didinant jų filtracijos laiką, įrenginio valymo efektyvumas didėja. Peзюме Для выполнения экспериментальных исследований использовалось биологическое устройство для очистки воздуха – биофильтр, загруженный загрузкой различной породы, состоящей из цеолита, поролона и древесины. При смешивании поролона, цеолита и древесины для очистки воздуха от летучих органических составов применялся не только биологический, но и aдсорбционный метод очистки воздуха. При совместном применении разных технологий очистки улучшается эффективность устройства и продлевается срок действия загрузки. Исследование показало, что микроорганизмы могут размножаться и на загрузках неорганического происхождения, состоящих из природного цеолита и поролона. При выращивании самопроизвольных ассоциаций микроорганизмов установлены зависимости эффективности очистки воздуха от вида поступающего загрязнителя, концентрации и периода фильтрации. Фильтрация была наилучшей, когда воздух, загрязненный ацетоном, подавался в биофильтр со скоростью 0,1 м/сек. Эффективность биофильтра при очищении воздуха от ацетона, первоначальная концентрация которого составляла 103 мг/м3 , достигала 95%. Эффективность очищения воздуха в устройстве увеличивается, когда концентрация поставляемых в биофильтр загрязнителей уменьшается, а период фильтрации продлевается. First Published Online: 14 Oct 2010 Reikšminiai žodžiai: biofiltras, lakieji organiniai junginiai, biodegradacija, ceolitas, adsorbcija, mikroorganizmai. Ключевые слова: биофильтр, летучие органические составы, биологический распад, цеолит, адсорбция, микроорганизмы.