MODELLING AND SIMULATION OF THREE PHASE BIOREACTORS APPLIED TO THE DEPOLLUTION OF GASEOUS STREAMS CONTAINING VOLATILE ORGANIC COMPOUNDS - A COMPARISON BETWEEN FIXED BED AND FLUIDIZED BED BIOREACTORS

2004 ◽  
Vol 3 (2) ◽  
pp. 177-197
Author(s):  
Oana Penciu ◽  
Florina Ungureanu ◽  
Maria Gavrilescu
Keyword(s):  
Volatile Organic Compounds ◽  
Fluidized Bed ◽  
Organic Compounds ◽  
Fixed Bed ◽  
Modelling And Simulation ◽  
Three Phase ◽  
Volatile Organic

scholarly journals Plant Growth Regulators Improve the Production of Volatile Organic Compounds in Two Rose Varieties

Plants ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 35 ◽  
Author(s):  
Mohammed Ibrahim ◽  
Manjree Agarwal ◽  
Jeong Oh Yang ◽  
Muslim Abdulhussein ◽  
Xin Du ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Volatile Organic Compounds ◽  
Plant Growth ◽  
Plant Growth Regulators ◽  
Organic Compounds ◽  
Growth Regulators ◽  
Naphthalene Acetic Acid ◽  
Flame Ionization ◽  
Three Phase ◽  
Volatile Organic

The study focused on the influence of the plant growth regulators (PGRs) benzyladenine (BA) and naphthalene acetic acid (NAA) on the production of volatile organic compounds (VOCs) from the flowers of two modern rose varieties, Hybrid Tea and Floribunda. Thirty-six plants of Hybrid Tea and Floribunda were tested. Benzyladenine and naphthalene acetic acid were applied at 0, 100 and 200 mg/L to both rose varieties. Gas chromatography, coupled with flame ionization detection and mass spectrometry, was used to analyze and identify the volatile organic compounds from the flowers. A three-phase fiber 50/30 µm divinylbenzene/carboxen/polydimethylsiloxane was used to capture VOCs, at 2, 4 and 8 weeks, and 4 weeks was selected as it had the highest peak area. In total, 81 and 76 VOCs were detected after treatment of both rose varieties with BA and NAA, respectively. In addition, 20 compounds, which had significant differences between different treatments, were identified from both rose varieties. The majority of VOCs were extracted after the application of 200 mg (BA and NAA) /L of formulation, and four important compounds, cis-muurola-4(141)5-diene, y-candinene, y-muurolene and prenyl acetate, increased significantly compared to the controls. These compounds are commercially important aroma chemicals. This study used the rapid and solvent-free SPME method to show that BA and NAA treatments can result in significant VOC production in the flowers of two rose varieties, enhancing the aromatic value of the flowers. This method has the potential to be applied to other valuable aromatic floricultural plant species.

Kinetics and transport parameters for the fixed-bed catalytic incineration of volatile organic compounds

1991 ◽  
Vol 25 (12) ◽  
pp. 2065-2070 ◽  
Author(s):  
Albert C. Frost ◽  
John E. Sawyer ◽  
Jerry C. Summers ◽  
Yatish T. Shah ◽  
Carlos G. Dassori
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Fixed Bed ◽  
Transport Parameters ◽  
Volatile Organic ◽  
Catalytic Incineration

Modeling Competitive Adsorption of Mixtures of Volatile Organic Compounds in a Fixed-Bed of Beaded Activated Carbon

2014 ◽  
Vol 48 (9) ◽  
pp. 5108-5117 ◽  
Author(s):  
Dereje Tamiru Tefera ◽  
Zaher Hashisho ◽  
John H. Philips ◽  
James E. Anderson ◽  
Mark Nichols
Keyword(s):  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Competitive Adsorption ◽  
Fixed Bed ◽  
Volatile Organic

A review on activated carbon adsorption for volatile organic compounds (VOCs)

2019 ◽  
Vol 35 (5) ◽  
pp. 649-668 ◽  
Author(s):  
Wee Kong Pui ◽  
Rozita Yusoff ◽  
Mohamed Kheireddine Aroua
Keyword(s):  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Adsorption ◽  
Computational Simulation ◽  
Fixed Bed ◽  
Activated Carbon Adsorption ◽  
Voc Adsorption ◽  
Volatile Organic ◽  
Adsorption Processes

Abstract A number of control methods have been adopted for the removal of hazardous volatile organic compounds (VOCs) from gas streams, particularly adsorption processes which are considered more prominent in terms of feasibility, effectiveness as well as cost competence compared to other methods. In this study, most of the activated-carbon-based adsorbents are critically reviewed in terms of their advantages and limitations for VOC gas adsorption. The choice of adsorbent and process parameters depends mainly on the type of VOC used, its chemical and structural properties, in addition to the adsorbent’s characteristics. The review discusses in detail the application of fixed-bed adsorption systems. A computational simulation study using quantum-chemical conductor like screening model for real solvents is included in this review which determines the efficiency in describing and predicting the adsorption technique required for each process. This review offers a comprehensive discussion of the VOC adsorption techniques and their implementation for different applications.

Biofiltration of Volatile Organic Compounds by a Fluidized Bed of Sawdust

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Arnaud Delebarre ◽  
Yves Andres ◽  
Mario Pellerano ◽  
Patrizia Pero ◽  
David Gerardo Garcia Munzer
Keyword(s):  
Volatile Organic Compounds ◽  
Activated Sludge ◽  
Fluidized Bed ◽  
Organic Compounds ◽  
Biological Characteristics ◽  
Natural Material ◽  
Material Characteristics ◽  
Air Temperatures ◽  
Volatile Organic ◽  
And Control

In this study, the use of a natural material, sawdust, in a fluidised biofiltrer has been considered. The performance of the biofiltration of ethanol and toluene was estimated in the presence of the native microorganisms of the material and also after the addition, and a period of acclimatization, of external microorganisms. Modifications of the physical and biological characteristics of the material were studied in order to better understand the process. The influence of biofilter shutdown periods was also considered to evaluate the effect of a period of inactivity on subsequent performances.This study shows that a significant degradation of the pollutants is obtainable provided that the following steps are performed: seeding with activated sludge, introduction of nutrients, and control of the changes in the material characteristics and the bed moisture.During the operation of the fluidized bed biofilter, the moisture of the bed had an important effect on the biofilter performance, but was rather difficult to control because of its dependence on the ambient and inlet air temperatures, which changed during the day and the seasons. During the tests with the batch of sawdust particles used as delivered without any sludge enrichment, a reduction in abatement performances was measured with time. In the case of ethanol alone, for a concentration of 0.02 g.m-3, abatement decreased from 24% to 18% then to 7%. The partial or complete addition of sawdust particles previously activated with sludge significantly enhanced the performance of the biofilter, both for ethanol and toluene pollution. Abatements of ethanol of 85% and 60% were achieved when the sawdust particles were activated by sludge. In contrast, a 5-week shutdown of the reactor produced a decrease in abatement, either by a loss of microorganism efficiency during their "starvation" or by their destruction.

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