Investigation Into Determining the Humidity of Charge Used for Biological Air Treatment

Abstract

Microorganisms can reproduce only in such substrata which contain a certain amount of water and dissolved nutritious substances. Therefore, it is necessary to search for such charges that are distinguished by a large filtering surface and good humidity‐retaining properties. In experiments three types of materials ‐ wood, zeolite and foam ‐ were used as a charge for the biological air‐cleaning process. The charges were mixed up to maintain humidity necessary for the microorganisms in the biofilter as long as possible. The charges were placed into three different cassettes in the biofilter. The wood charge consisted of wood chips of 10–15 mm and that of zeolite contained 10–12 mm of zeolite granules. The foam rubber was cut into separate cubes each having the dimensions of 30×30×20 mm. Dependence of the charge humidity on the airflow rate, temperature, time and charge thickness was determined in the work. During the experiments the airflow rate reached 0.1–0.6 m/sec., and the temperature ranged from 15 to 35 °C. Foam showed the best sorption properties, but a better distribution of humidity was found in the wood‐chip charge.

Investigation and Analysis of Air-Cleaning Biofilter Hybrid Biocharge Quantitative and Qualitative Parameters / Oro Valymo Biofiltro Mišrios Įkrovos Kiekybinių Ir Kokybinių Mikrobiologinių Parametrų Tyrimai / Исследование Количественных Ик А Чественных Микробиологических Параметроввоздухоочистного Биофильтра При Смешанной Загрузке

“…Out of it through the silicone hose 1 cm 3 of analysed specimen is infused into a clean medical syringe and later it is injected into the gas chromatograph vaporizer. Not less than 3 chromatograms are written down, according to which the analysed specimen concentrations are calculated (Baltrėnas and Zagorskis 2007a;Baltrėnas and Vaiškūnaitė 2003;Baltrėnas et al 2004). …”

“…The biocharge mixture is received by mixing these factions at a ratio of 1:1:1. Each cassette is separated by metal nets for maintaining equivalent air flow in the entire device (Baltrėnas and Zagorskis 2007a).…”

“…2). When the charge porosity is higher, a thicker layer of biomembrane forms on the charge surface and it determines the higher microbiological activity of the charge in the foam (Baltrėnas and Zagorskis 2007a). However, the absorption features are not sufficient for the biocharge.…”

Investigation of Cleaning Efficiency of a Biofilter With an Aeration Chamber/Valymo Biofiltru Su Aeracine Kamera Efektyvumo Tyrimai/Исследование Эффективности Биофильтра С Аэрационной Камерой

“…After being weighed, the weighing bottle with the sample is placed into the drying cabinet and dried for 3 h at a temperature of 105±2 °C. The dried sample is weighed and its humidity is determined (Baltrėnas and Zagorskis 2007).…”

Investigation Into the Air Treatment Efficiency of Biofilters of Different Structures

“…In the case of a high humidity of the charge anaerobic areas increasing its aerodynamic resistance emerge inside the filtering layer. This shortens the time of interaction of pollutants and microorganisms and at the same time reduces the treatment efficiency of the device (Baltrėnas and Zagorskis 2007).…”