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Biofiltration of air polluted with xylene vapors was carried out for nearly two years in a large laboratory-scale installation with a volume of the bed of expanded clay equal to 32 dm3. During the experiment, different xylene inlet concentrations were applied, within the range from 300 to over 1500 mg/m3 at a linear gas flow rate of 0.008, 0.016, and 0.033 m/s, as well as 0.12 and 0.24 dm3 of medium dispensed every 3 h on top of the bed. The progress of the process was followed by measuring the xylene concentration at the inlet and outlet of the column, column mass, and gas flow resistance. The capability to purify air polluted with xylene with an average efficiency of approx. 90% was demonstrated. The process was interrupted by a significant increase in gas flow resistance, caused by a large growth of biomass, resulting in an increase in the mass of the bed by more than 45%. Both intensive rinsing of the bed with a stream of water, causing its fluidization, and rinsing and mixing after removing the bed from the column allowed to reduce flow resistance to a value close to the initial one. To ensure the supply of biogenic elements, it was necessary to periodically spray the bed with a solution of the medium in an amount of up to about 0.1 dm3/h/m3 of purified air.
Anita Turała; Andrzej Wieczorek. Biomass Growth and Its Control in the Process of Biofiltration of Air Contaminated with Xylene on a Biotrickling Column Filled with Expanded Clay. Sustainability 2020, 12, 5412 .
AMA StyleAnita Turała, Andrzej Wieczorek. Biomass Growth and Its Control in the Process of Biofiltration of Air Contaminated with Xylene on a Biotrickling Column Filled with Expanded Clay. Sustainability. 2020; 12 (13):5412.
Chicago/Turabian StyleAnita Turała; Andrzej Wieczorek. 2020. "Biomass Growth and Its Control in the Process of Biofiltration of Air Contaminated with Xylene on a Biotrickling Column Filled with Expanded Clay." Sustainability 12, no. 13: 5412.
This study was aimed at investigating the physicochemical and microbiological changes that took place during the ageing process of spent bleaching earth in the presence of autochthonous microorganisms. Research material included fresh spent bleaching earth (SBE0) and the same material after 3 years of storage at the constant temperature of 20 °C, without aeration and moistening (SBE3). Changes in the chemical composition of analysed waste material were observed during its ageing process point to a spontaneous bioconversion of fat substance towards formation and/or release of free saturated fatty acids C16:0 and C18:0 (14.3 g 100 g−1 D.M.), triterpenes (8.48 g 100 g−1 D.M.), cholesterol (3.29 g 100 g−1 D.M.), small quantities of carbohydrates and esters (0.80 g 100 g−1 D.M.). This process was accompanied by other changes in physicochemical parameters of the waste material, such as colour, odour and viscosity, decrease in fat content from 28.27 to 24.6 % and that of soluble forms of metals (Mo, Cu, Fe, Zn, Ni, Cr and Mn), ranging from 25 to 75 %, and an increase in pH, from 3.85 to 4.2. At the same time, changes in the microbial consortium were observed.
Teresa Krzysko-Lupicka; Krystyna Cybulska; Andrzej Wieczorek; Ewa Możdżer; Maciej J. Nowak. The effect of spent bleaching earth ageing process on its physicochemical and microbial composition and its potential use as a source of fatty acids and triterpenes. Environmental Science and Pollution Research 2014, 21, 10765 -10774.
AMA StyleTeresa Krzysko-Lupicka, Krystyna Cybulska, Andrzej Wieczorek, Ewa Możdżer, Maciej J. Nowak. The effect of spent bleaching earth ageing process on its physicochemical and microbial composition and its potential use as a source of fatty acids and triterpenes. Environmental Science and Pollution Research. 2014; 21 (18):10765-10774.
Chicago/Turabian StyleTeresa Krzysko-Lupicka; Krystyna Cybulska; Andrzej Wieczorek; Ewa Możdżer; Maciej J. Nowak. 2014. "The effect of spent bleaching earth ageing process on its physicochemical and microbial composition and its potential use as a source of fatty acids and triterpenes." Environmental Science and Pollution Research 21, no. 18: 10765-10774.
Andrzej Wieczorek; Krystyna Przybulewska; Katarzyna Karpowicz; Maciej J Nowak. The screening of microorganisms capable of methyl tert-butyl ether (MTBE) biodegradation. Polish Journal of Microbiology 2013, 62, 1 .
AMA StyleAndrzej Wieczorek, Krystyna Przybulewska, Katarzyna Karpowicz, Maciej J Nowak. The screening of microorganisms capable of methyl tert-butyl ether (MTBE) biodegradation. Polish Journal of Microbiology. 2013; 62 (2):1.
Chicago/Turabian StyleAndrzej Wieczorek; Krystyna Przybulewska; Katarzyna Karpowicz; Maciej J Nowak. 2013. "The screening of microorganisms capable of methyl tert-butyl ether (MTBE) biodegradation." Polish Journal of Microbiology 62, no. 2: 1.