scholarly journals Monitoring of benzene, toluene, ethyl benzene, and xylene isomers emission from Shahreza gas stations in 2013

2015 ◽  
Vol 4 (1) ◽  
pp. 17 ◽  
Author(s):  
Yaghoub Hajizadeh ◽  
Hamidreza Pourzamani ◽  
MohamadMehdi Amin ◽  
Farhad Esmaelnejad
Keyword(s):  
Ethyl Benzene ◽  
Gas Stations ◽  
Benzene Toluene ◽  
Xylene Isomers

Exposure Assessment to Benzene, Toluene, Ethyl Benzene and Xylene (BTEX) in Gas Stations in Central Region of Iran

2016 ◽  
Vol 13 (1) ◽  
pp. 43-48
Author(s):  
Mehrzad Ebrahemzadih ◽  
Abolfazl Barkhordari Firooz Abadi ◽  
Omid Giahi ◽  
Nasim Tahmasebi
Keyword(s):  
Exposure Assessment ◽  
Central Region ◽  
Ethyl Benzene ◽  
Gas Stations ◽  
Benzene Toluene

scholarly journals Revealing Benzene, Toluene, Ethyl Benzene, Xylenes (BTEX) Emission at Gas Stations, Case Study in Semarang City

2019 ◽  
Vol 125 ◽  
pp. 10002
Author(s):  
Haryono S Huboyo ◽  
Irawan W Wardhana ◽  
Auliafika Resminingpuri
Keyword(s):  
Secondary Data ◽  
Quality Standard ◽  
Ethyl Benzene ◽  
Gas Stations ◽  
Measurement Results ◽  
Benzene Toluene ◽  
Gas Station ◽  
Station Location ◽  
And Storage

Evaporation of gasoline at gas stations is the origin of air pollutants in gas station environment. This study is intended to estimate BTEX emission levels at gas stations and mapping BTEX emissions at all gas stations in Semarang. 4.09 D Tank Program with supported data collected by survey and secondary data used to calculate the estimated emissions. We also measured BTEX levels in the gas station location sample with charcoal tubes as adsorbent and PCXR4 mini pump sampler. The emissions from dispensers and storage tanks in gas stations have different emission characteristics. The amount of emissions from dispensers for VOC pollutants is 3.9261 tons/year and benzene is 0.0561 tons/year (case study UNDIP gas station). While the emission from a storage tank for VOC pollutants was 232.91 tons/year, benzene was 1.79 tons/year, toluene was 33.36 tons/year, ethylbenzene was 0.39 tons/year, and xylene was 1.43 Tons/year. The estimation results of the model with the results of direct BTEX measurements in the field showed that the field measurement results were smaller than those estimated. Some assumptions used in the calculations contribute to estimating uncertainty. The measured BTEX concentration still meets the quality standard (Minister of Manpower and Transmigration Regulation No. 13 of 2011).

scholarly journals Conditions chimiques contrôlant l'atténuation naturelle des BTEX et solvants chlorés : un état des connaissances

2005 ◽  
Vol 14 (4) ◽  
pp. 419-444 ◽  
Author(s):  
O. Atteia ◽  
M. Franceschi
Keyword(s):  
Cette Technique ◽  
Ethyl Benzene ◽  
Benzene Toluene

L'atténuation naturelle des BTEX (Benzène, Toluène, Ethyl-benzène, Xylène) et des solvants chlorés est de plus en plus étudiée en raison des potentialités offertes par cette technique de gestion. Cet article, après avoir présenté les aspects abiotiques de l'atténuation détaille les conditions chimiques nécessaires à la réalisation des réactions de biodégradation des polluants organiques. Les aspects thermodynamiques sont abordés afin de décliner les réactions possibles et celles qui ne le sont pas selon les environnements chimiques. La dégradation des BTEX est focalisée sur le benzène, produit le plus toxique et le moins dégradable sur la plupart des sites. Les détails de la dégradation du benzène sur le terrain sont analysés dans la littérature et leur comparaison permet de décrire les mécanismes responsables de celle-ci. Dans le cas des solvants chlorés, l'attention est portée sur le TCE (Trichloréthylène), produit le plus couramment rencontré sur les sites pollués. Une mise en parallèle des évolutions de teneurs observées et des conditions chimiques locales permet de mettre en évidence les conditions nécessaires à la dégradation du TCE, et de ses congénères, ainsi que les cinétiques de dégradation dans différentes conditions. La mise en évidence du rôle prépondérant des conditions chimiques conduit à remettre en cause l'utilisation répandue des constantes de dégradation du premier ordre et donne des pistes pour les modèles nécessaires à une prédiction plus fine de l'atténuation naturelle.

Aerobic Biodegradation of Aromatic and Chlorinated Hydrocarbons Commonly Detected in Landfill Leachates

1988 ◽  
Vol 23 (3) ◽  
pp. 460-475 ◽  
Author(s):  
Della J. Berwanger ◽  
James F. Barker
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Sediment ◽  
Chlorinated Hydrocarbons ◽  
Aerobic Biodegradation ◽  
Ethyl Benzene ◽  
Landfill Leachates ◽  
Toxic Level ◽  
Benzene Toluene ◽  
Hazardous Organics

Abstract Aromatic and chlorinated hydrocarbons are hazardous organics which persist in groundwater impacted by landfill leachate. Recent studies have indicated that the aromatics biodegrade readily under aerobic conditions. Similarly, methane-oxidizers are reported to metabolize trichloroethylene. This study investigates an in-situ biorestoration scheme involving stimulating aerobic biodegradation in a contaminated anaerobic, methane-saturated groundwater using hydrogen peroxide as an oxygen source. Batch biodegradation experiments were conducted with groundwater and core obtained from the Gloucester Landfill, Ottawa, Canada. Hydrogen peroxide, added at a non-toxic level, provided oxygen which promoted the rapid biodegradation of benzene, toluene, ethyl benzene, o-, m-, and p-xylene. Morphologically different methane-oxidizing cultures were obtained from Gloucester groundwater and a surface sediment. Both cultures degraded trichloroethylene in microcosms containing a mineral media and Gloucester core. Degradation was not observed when the mineral madia was replaced with Gloucester groundwater, or when other chlorinated hydrocarbons were added. Additional research is required to identify and overcome this inhibition to trichloroethylene biodegradation, before this remedial strategy can be employed.

Microbial degradation of benzene, toluene, ethylbenzene and xylene isomers (BTEX) contaminated groundwater in Korea

2001 ◽  
Vol 44 (7) ◽  
pp. 165-171 ◽  
Author(s):  
S. W. Chang ◽  
H. J. La ◽  
S. J. Lee
Keyword(s):  
Potent Inhibitor ◽  
Inhibitory Effect ◽  
Contaminated Groundwater ◽  
Interaction Patterns ◽  
Contaminated Aquifer ◽  
Substrate Interaction ◽  
Substrate Degradation ◽  
Benzene Toluene ◽  
Xylene Isomers ◽  
Btex Compounds

A mixed culture derived from a gasoline-contaminated aquifer in Korea was enriched on toluene at 25°C. A study was conducted to characterize the substrate interaction of BTEX by toluene-enriched consortia and determine the effects of initial BTEX concentration on BTEX degradation. Substrate degradation patterns in individual aromatics were found to differ significantly from patterns for aromatics in mixtures. In the experiment of a single substrate, toluene was degraded fastest, followed by benzene, ethylbenzene, and the xylenes. In BTEX mixtures, degradation followed the order of toluene, ethylbenzene, benzene, and the xylenes. The studies conducting with toluene-enriched consortia evaluated substrate interactions by the concurrent presence of multiple BTEX compounds and revealed a range of substrate interaction patterns including no interaction, stimulation, inhibition, and cometabolism. The simultaneous presence of benzene and toluene were degraded with a slight inhibitory effect on each other. Ethylbenzene was shown to be the most potent inhibitor of BTEX degradation. p-xylene also inhibited the degradation of benzene, toluene, and ethylbenzene, whereas the presence of either benzene or toluene enhanced the degradation of ethylbenzene and the xylenes.

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