scholarly journals Comparative Evaluation of Selected Biological Methods for the Removal of Hydrophilic and Hydrophobic Odorous VOCs from Air

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 187 ◽  
Author(s):  
Milena Gospodarek ◽  
Piotr Rybarczyk ◽  
Bartosz Szulczyński ◽  
Jacek Gębicki
Keyword(s):  
Pairwise Comparison ◽  
Process Efficiency ◽  
Biological Processes ◽  
Environmental Aspects ◽  
Efficient Removal ◽  
Evaluation Strategies ◽  
Effective Removal ◽  
Volatile Organic ◽  
Odorous Compounds ◽  
Biological Methods

Due to increasingly stringent legal regulations as well as increasing social awareness, the removal of odorous volatile organic compounds (VOCs) from air is gaining importance. This paper presents the strategy to compare selected biological methods intended for the removal of different air pollutants, especially of odorous character. Biofiltration, biotrickling filtration and bioscrubbing technologies are evaluated in terms of their suitability for the effective removal of either hydrophilic or hydrophobic VOCs as well as typical inorganic odorous compounds. A pairwise comparison model was used to assess the performance of selected biological processes of air treatment. Process efficiency, economic, technical and environmental aspects of the treatment methods are taken into consideration. The results of the calculations reveal that biotrickling filtration is the most efficient method for the removal of hydrophilic VOCs while biofilters enable the most efficient removal of hydrophobic VOCs. Additionally, a simple approach for preliminary method selection based on a decision tree is proposed. The presented evaluation strategies may be especially helpful when considering the treatment strategy for air polluted with various types of odorous compounds.

Traitement de l'air par biofiltration

1999 ◽  
Vol 26 (4) ◽  
pp. 402-424 ◽  
Author(s):  
Hasnaa Jorio ◽  
Michèle Heitz
Keyword(s):  
Current Knowledge ◽  
Industrial Applications ◽  
Biological Processes ◽  
Environmental Aspects ◽  
Basic Principles ◽  
Operational Conditions ◽  
Volatile Organic ◽  
Recent Developments ◽  
Treatment Technologies ◽  
Expensive Process

During several decades, there have been numerous studies and attempts in the field of the treatment of volatile organic solvent contaminated air, with the aim of finding a more efficient and less expensive process. In parallel with the traditional air treatment technologies, biological processes have emerged in recent years. Biofiltration appears to be a particularly preferred path due to its efficiency, its environmental aspects, and its lower costs. In this paper, the biofiltration technology is positioned in relation to conventional techniques and other biological air treatments. Subsequently, after a short historical account of biofiltration, the focus is put on the main objective of this literature review, presenting the current knowledge about the basic principles of the process, its applicability, operational conditions that influence performance and reliability of this process, and recent developments in mathematical biofilter modeling. Finally, industrial applications and biofiltration processing costs are briefly discussed.Key words: biofilter, VOC, biodegradation, modeling, kinetics, humidity, temperature, pH, nutrients, oxygen.[Journal translation]

scholarly journals Chlorine-Resistant Hollow Nanosphere-Like VOx/CeO2 Catalysts for Highly Selective and Stable Destruction of 1,2-Dichloroethane: Byproduct Inhibition and Reaction Mechanism

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 119
Author(s):  
Yu Huang ◽  
Shiyue Fang ◽  
Mingjiao Tian ◽  
Zeyu Jiang ◽  
Yani Wu ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Acid Sites ◽  
Strong Interactions ◽  
Hollow Nanosphere ◽  
Efficient Removal ◽  
Chlorinated Volatile Organic Compounds ◽  
Molar Ratios ◽  
Volatile Organic ◽  
Redox Ability ◽  
Species Mobility

Developing economical and robust catalysts for the highly selective and stable destruction of chlorinated volatile organic compounds (CVOCs) is a great challenge. Here, hollow nanosphere-like VOx/CeO2 catalysts with different V/Ce molar ratios were fabricated and adopted for the destruction of1,2–dichloroethane (1,2–DCE). The V0.05Ce catalyst possessed superior catalytic activity, reaction selectivity, and chlorine resistance owing to a large number of oxygen vacancies, excellent low-temperature redox ability, and chemically adsorbed oxygen (O− and O2−) species mobility. Typical chlorinated byproducts (CHCl3, CCl4, C2HCl3, and C2H3Cl3) derived from the cleavage of C–Cl and C–C bonds of 1,2–DCE were detected, which could be effectively inhibited by the abundant acid sites and the strong interactions of VOx species with CeO2. The presence of water vapor benefited the activation and deep destruction of 1,2–DCE over V0.05Ce owing to the efficient removal of Cl species from the catalyst surface.

Assessing the potential of a UV-based AOP for treating high-salinity municipal wastewater reverse osmosis concentrate

2013 ◽  
Vol 68 (9) ◽  
pp. 1994-1999 ◽  
Author(s):  
Muhammad Umar ◽  
Felicity Roddick ◽  
Linhua Fan
Keyword(s):  
Reverse Osmosis ◽  
Municipal Wastewater ◽  
High Salinity ◽  
Oxygen Demand ◽  
Process Efficiency ◽  
Secondary Effluent ◽  
Biological Processes ◽  
Fluorescence Excitation ◽  
H2o2 Treatment ◽  
Humic Compounds

The UVC/H2O2 process was studied at laboratory scale for the treatment of one moderate (conductivity ∼8 mS/cm) and two high salinity (∼23 mS/cm) municipal wastewater reverse osmosis concentrate (ROC) samples with varying organic and inorganic characteristics. The process efficiency was characterized in terms of reduction of dissolved organic carbon (DOC), chemical oxygen demand (COD), colour and absorbance at 254 nm (A254), and the improvement of biodegradability. The reduction of colour and A254 was significantly greater than for DOC and COD for all samples due to the greater breakdown of humic compounds, as confirmed by fluorescence excitation-emission matrix spectra. Fairly small differences in the reduction of DOC (26–38%) and COD (25–37%) were observed for all samples, suggesting that the salinity of the ROC did not have a significant impact on the UVC/H2O2 treatment under the test conditions. The biodegradability of the treated ROC samples improved markedly (approximately 2-fold) after 60 min UVC/H2O2 treatment. This study indicates the potential of UVC/H2O2 treatment followed by biological processes for treating high-salinity concentrate, and the robustness of the process where the characteristics of the secondary effluent (influent to RO) and thus resultant ROC vary significantly.

scholarly journals Discharge photoelectrocatalytic system for the degradation of aromatics

2003 ◽  
Vol 5 (1) ◽  
pp. 3-6 ◽  
Author(s):  
Hak-Soo Kim ◽  
Eun-Ah Lee ◽  
Ju-Hyeon Lee ◽  
Chul-Hee Han ◽  
Jin-Wook Ha ◽  
...  
Keyword(s):  
Thin Film ◽  
Aromatic Compounds ◽  
Film Coating ◽  
Efficient Removal ◽  
Thin Film Coating ◽  
Electron Hole ◽  
Volatile Organic ◽  
Reduced Rate ◽  
High Voltage Discharge ◽  
Hole Recombination

We have introduced the discharge photoelectrocatalytic system, in whichTiO2thin film coating on aluminum plate is subjected simultaneously to both UV irradiation and high voltages in excess of 3000 volts. Due to high voltagesO3is generated; however, efficient removal ofO3is observed in this photoelectrocatalytic system. In terms of the removal of volatile organic compounds (VOCs), the discharge photoelectrocatalytic system has been applied to the removal of aromatic compounds such as benzene and toluene. Based on the experimental data, the rates of the removal of these compounds in this system are higher compared to either the discharge—only system (without the photocatalyst) or the photocatalyst—only system (without high voltage discharge), and the higher rates of degradation of these compounds in the photoelectrocatalytic system are attributed to the reduced rate of electron-hole recombination inTiO2.

scholarly journals The use of various species of fungi in biofiltration of air contaminated with odorous volatile organic compounds

2019 ◽  
Vol 100 ◽  
pp. 00021 ◽  
Author(s):  
Milena Gospodarek ◽  
Piotr Rybarczyk ◽  
Anna Brillowska-Dąbrowska ◽  
Jacek Gębicki
Keyword(s):  
Environmental Problem ◽  
Experimental Studies ◽  
Fungal Species ◽  
Biotrickling Filters ◽  
Literature Overview ◽  
Volatile Organic ◽  
Odorous Compounds ◽  
Selection Of Microorganisms ◽  
Selection Of

Air pollution with odorous compounds is a significant social and environmental problem. This paper presents biological deodorization methods. The attention is focused on the application of biotrickling filters for air deodorization. Principles of their operation are discussed, indicating the key role of the selection of microorganisms responsible for the degradation of odorous compounds. A literature overview of the used fungal species is presented and the advantages of using fungi in comparison with bacteria are indicated. The results of experimental studies on the n-butanol removal in biotrickling filter are presented.

scholarly journals Recent Progress in Metal–Organic Framework-Derived Nanostructures in the Removal of Volatile Organic Compounds

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4948
Author(s):  
Deval Prasad Bhattarai ◽  
Bishweshwar Pant ◽  
Jiwan Acharya ◽  
Mira Park ◽  
Gunendra Prasad Ojha
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Metal Organic Framework ◽  
Research Progress ◽  
Efficient Removal ◽  
Surface Areas ◽  
Covalently Bonded ◽  
Volatile Organic ◽  
Metal Organic ◽  
Normal Composition

Air is the most crucial and life-supporting input from nature to the living beings of the planet. The composition and quality of air significantly affects human health, either directly or indirectly. The presence of some industrially released gases, small particles of anthropogenic origin, and the deviation from the normal composition of air from the natural condition causes air pollution. Volatile organic compounds (VOCs) are common contaminants found as indoor as well as outdoor pollutants. Such pollutants represent acute or chronic health hazards to the human physiological system. In the environment, such polluted gases may cause chemical or photochemical smog, leading to detrimental effects such as acid rain, global warming, and environmental pollution through different routes. Ultimately, this will propagate into the food web and affect the ecosystem. In this context, the efficient removal of volatile organic compounds (VOCs) from the environment remains a major threat globally, yet satisfactory strategies and auxiliary materials are far from being in place. Metal–organic frameworks (MOFs) are known as an advanced class of porous coordination polymers, a smart material constructed from the covalently bonded and highly ordered arrangements of metal nodes and polyfunctional organic linkers with an organic–inorganic hybrid nature, high porosities and surface areas, abundant metal/organic species, large pore volumes, and elegant tunability of structures and compositions, making them ideal candidates for the removal of unwanted VOCs from air. This review summarizes the fundamentals of MOFs and VOCs with recent research progress on MOF-derived nanostructures/porous materials and their composites for the efficient removal of VOCs in the air, the remaining challenges, and some prospective for future efforts.

scholarly journals Insights into modification of lignocellulosic fillers with isophorone diisocyanate: structure, thermal stability and volatile organic compounds emission assessment

2020 ◽  
Author(s):  
Aleksander Hejna ◽  
Mariusz Marć ◽  
Katarzyna Skórczewska ◽  
Joanna Szulc ◽  
Jerzy Korol ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Mechanical Performance ◽  
Significant Rise ◽  
Isophorone Diisocyanate ◽  
Environmental Aspects ◽  
Wood Polymer ◽  
Volatile Organic ◽  
Internal Mixer ◽  
Different Content

Abstract This study presents an analysis of the structure and properties of different types of lignocellulosic fillers modified by isophorone diisocyanate (IPDI) to provide insights into the possibility of their application to the manufacturing of wood polymer composites (WPCs). Moreover, it deals with the environmental aspects of modified fillers, by assessment of volatile organic compounds (VOCs) emitted during modification, as well as from final products. Three types of commercially available lignocellulosic fillers were modified with different content of IPDI (from 1 to 15 wt%) using the internal mixer. The main compounds detected in the air during modifications were terpenes and terpenoids. No IPDI was detected, which is very beneficial considering its toxicity. On the other hand, IPDI was emitted from modified fillers at a slightly elevated temperature of 40 °C, which was associated with a significant rise in its vapor pressure. Successful modification of fillers was confirmed by FTIR spectroscopy and thermogravimetric analysis. Performed modifications of lignocellulosic fillers with IPDI had a relatively small impact on their particle size and color properties. Such an effect can be considered beneficial for the mechanical performance and appearance of WPCs, which could be potentially manufactured using IPDI-modified lignocellulosic fillers.

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