Abstract
Development of industry is not always accompanied with the implementation of clean technologies, thus the problem of air and water purification remains. For the moment, pollution with different paint components is widely spread and hard to be solved. A biofilter was developed at the Department Environmental Protection of Vilnius Gediminas Technical University (VGTU), and its chemical and physical purification principles and properties are analysed in works [1–3]. Besides the efficiency of pollutant cleaning, the characteristics of filter aerodynamic resistance are also essential, therefore, the aerodynamic properties of the biofilter are analysed in this work. For anticipation and theoretical evaluation of aerodynamic processes going on in a biological air‐purification device, the processes occurring in the object being investigated ‐ a biofilter ‐ were modelled with the help of Phoenics, Versions 3.2 and 3.5. Aerodynamic processes ‐ in‐coming flow velocity and aerodynamic charge resistance ‐ were analysed with the help of the software package Phoenics, Versions 3.2 and 3.5. Modelling was based on mathematical equations that describe physical laws.
Highlights
Flowing through a biofilter could be treated as flowing through a porous material
When purifying air with the help of the filter, it is purified only from some or other polluting gaseous components, in the course of operation of such a filter its aerodynamic resistance remains unchanged in time, and only filter purification efficiency undergoes changes
The biofilter with activated bark charge was modelled with the help of the software Phoenics, Versions 3.2 and 3.5, Taking into consideration the porosity of the filter charge (7580 %), the number of layers (150 mm), the dynamics of aerodynamic processes, i e the velocity of the in-coming air and aerodynamic resistance of the charge, were modelled
Summary
Flowing through a biofilter could be treated as flowing through a porous material. In practice granular or fibre filters are usually used for the purification of dusty air. Until the last works, granular filters were used only for the purification of air polluted with aerosols and dusts During operation of such filters both their aerodynamic resistance and efficiency were fluctuating. When purifying air with the help of the filter, it is purified only from some or other polluting gaseous components, in the course of operation of such a filter its aerodynamic resistance remains unchanged in time, and only filter purification efficiency undergoes changes. It is a key property of the filter.
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