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Air cleaning efficiency tests on placing material load into the lavsan biofilter were carried out. Testing included butanol vapour-contaminated air stream pulled during the boot. The studies were conducted by the Department of Environmental Protection at VGTU that developed a biofilter - an experimental biological air cleaning device. Measurements were done using 60 lmin and 90 lmin air volume aspirators under the initial pollutant concentration making 180,305, 350,440 and 545 mg/m³. Before measuring the concentrations of butanol lavsan cartridge, loading was periodically irrigated with nutrient-rich solution. In order to evaluate the influence of microorganisms on genus Pseudomonas, cleaning efficiency tests were repeated - Boot was moistened with water only, which allowed measuring butanol vapour concentrations after the cartridge. At the concentration of 180±9 mg/m³, efficiency reached 41% at a speed of 0,07 m/s and 46 % at a speed of 0,10 m/s. Measuring the performance of the initial concentration of 545±67 mg/m³, efficiency was 54% at 0,07 m/s and 53 % at 0,10 m/s respectively. [ABSTRACT FROM AUTHOR]

In order to properly analyse the operation of a two-level multichannel cyclone. a study on how air flow moves inside the cyclone is necessary. The two-level multichannel cyclone is designed to separate solid particles from the air stream and has been built in the Environmental Protection Laboratory at Vilnius Gediminas Technical University. Researches on finding how the air flow distributes within two levels and channels of the six-channel cyclone were made. Air velocity was measured using multimeter Testo-400 and dynamic Pito tube. Air velocity measurements in ducts before and after the device were done using an anemometer. The results showed that the air volume at both cyclone levels were equal, and air velocity in the channels that were the same at both levels was also distributed equally. The highest air speed was measured at the end of the last IV channel and reached 13 m/s. Minimum air velocity can be observed when the rings are arranged in such way that 75% of the air flow returns to the previous channel, and the maximum speed is when the previous channel returns 25% of the air flow. [ABSTRACT FROM AUTHOR]