AIR PRE-TREATMENT SYSTEM

2020 ◽  
pp. 57-63
Author(s):  
S. A. Mikaeva ◽  
A. S. Mikaeva ◽  
L. A. Vasilyeva ◽  
O. E. Zheleznikova
Keyword(s):  
Hydrogen Sulfide ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Ventilation System ◽  
Electrical Equipment ◽  
The Other ◽  
Safety Requirements ◽  
Volatile Organic ◽  
Pre Treatment ◽  
High Concentrations

The article describes the air pretreatment system designed to reduce high concentrations of hydrogen sulfide and volatile organic compounds through the use of specialized catalytic backfill. The system is a 20- or 40-foot insulated sea container in which two catalytic backfill units are located. One worker the other reserve. Each unit contains one cleaning step with a specialized ferruginous backfill. The installation does not have its own fan and is connected to the existing ventilation system be installed in front of the installation EVENTLET. The operation of the system is subject to all safety requirements for the operation of electrical equipment, which is powered by a voltage of 380 V and a frequency of 50/60 Hz. The technical characteristics and Assembly of the system are given.

Air purification system

2020 ◽  
pp. 118-122
Keyword(s):  
Hydrogen Sulfide ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
The Other ◽  
Air Purification ◽  
Purification System ◽  
Volatile Organic ◽  
High Concentrations

An air purification system based on the use of specialized catalytic filling, designed to reduce high concentrations of hydrogen sulfide and volatile organic compounds is represented. The system is a 20 or 40 foot heated sea container in which two catalytic charge units are located: one is a working and the other is a reserve. Each block contains one cleaning step with a specialized ferrous charge.

Identification of Non-Volatile Components and Volatile Organic Compounds in Wet Building Materials

2012 ◽  
Vol 253-255 ◽  
pp. 825-828
Author(s):  
Jing Chen ◽  
Neng Zhu
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Building Materials ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Components ◽  
Acrylic Emulsion ◽  
Volatile Organic ◽  
Pre Treatment ◽  
Branched Chain ◽  
Styrene Butadiene

The major volatile components in two solvent-based paints, two thinners, and four adhesives have been identified by a method involving pre-treatment by solvent dilution, filtration, and gas chromatography-mass spectrometry. The non-volatile components in these wet building materials have been determined by infrared spectroscopy. The results have shown the major volatile organic compounds in one-component polyurethane varnish and alkyd paint thinner to be nonane, decane, undecane, xylene, ethylbenzene and ethyltoluene. The main film-forming matter in cement floor paint has been identified as styrenated acrylic emulsion, with the volatile components being mainly butyl acetate, decane and benzene series. The basic substances in these adhesives were polychloroprene, styrene butadiene carboxylated latex, or polyvinyl acetate emulsion. The primary volatile compounds in two adhesives were methyl acetate, and many branched-chain and normal alkanes, while those in the other two adhesives were toluene and benzene.

scholarly journals A comparison of removal performance of volatile organic and sulfurous compounds between odour abatement systems

2018 ◽  
Vol 77 (11) ◽  
pp. 2657-2667 ◽  
Author(s):  
A. Shammay ◽  
I. Evanson ◽  
R. M. Stuetz
Keyword(s):  
Hydrogen Sulfide ◽  
Activated Carbon ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Voc Removal ◽  
Biotrickling Filters ◽  
Volatile Organic ◽  
Sulfurous Compounds ◽  
Sulfide Species ◽  
Sewer Networks

Abstract Three types of odour abatement systems in sewer networks in Australia were studied for 18 months to determine the removals of different compounds. Six volatile sulfurous compounds and seven volatile organic compounds (VOCs) were further investigated. All types of odour abatement systems exhibited good removal of hydrogen sulfide with the biotrickling filters (BTFs) showing the highest consistent removal. Biofilters outperformed BTFs and activated carbon (AC) filters in the removal of dimethyl mono-, di- and tri-sulfide species at the low inlet concentrations typically found. AC filters exhibited little VOC removal with no compound consistently identified as having a removal greater than 0%. Biofilters outperformed BTFs in VOC removal, yet both had high removal variability.

scholarly journals APPLICATION ON THE WORKPLACES HAZARDS MEASUREMENT IN A BAKERY UNIT

2018 ◽  
Vol 23 (4) ◽  
Author(s):  
MIRELA PANAINTE-LEHADUS ◽  
NARCIS BARSAN ◽  
OANA IRIMIA ◽  
CLAUDIA TOMOZEI ◽  
EMILIAN MOSNEGUTU ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Human Activity ◽  
The Other ◽  
Toxic Substances ◽  
Volatile Organic ◽  
Temperature And Humidity ◽  
Noise Vibration ◽  
Maximum Allowable Concentrations

<p>The workplaces, where human activity takes place, is characterized by some complex factors that can affect the health of employees. These factors (temperature, humidity, noise, vibration, toxic substances, lighting, particulate matter etc.) can also be generalized as dangerous factors or workplaces hazards [1, 2, 3, 4]. In this article are presented some results obtained after workplaces hazards measurements in a production and sales bakery unit for the parameters: O<sub>2</sub>, SO<sub>2</sub>, CO, NH<sub>3</sub>, temperature, humidity, suspension powders, VOC. The values of the measured parameters particulate matter (0.17 mg/m<sup>3</sup> - 0.30 mg/m<sup>3</sup>) respectively volatile organic compounds (0.8 ppm ÷ 21.1 ppm) were below the maximum allowable concentrations, which indicates a safe workplaces for employees. The other parameters measured values, respectively temperature and humidity, were between 22.10<sup>0</sup>C - 29.20 °C for temperature and 47% - 53% for humidity.</p>

scholarly journals APPLICATION ON THE WORKPLACES HAZARDS MEASUREMENT IN A BAKERY UNIT

2017 ◽  
Vol 23 (4) ◽  
pp. 14-18
Author(s):  
MIRELA PANAINTE-LEHADUS ◽  
NARCIS BARSAN ◽  
OANA IRIMIA ◽  
CLAUDIA TOMOZEI ◽  
EMILIAN MOSNEGUTU ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Human Activity ◽  
The Other ◽  
Toxic Substances ◽  
Volatile Organic ◽  
Temperature And Humidity ◽  
Noise Vibration ◽  
Maximum Allowable Concentrations

The workplaces, where human activity takes place, is characterized by some complex factors that can affect the health of employees. These factors (temperature, humidity, noise, vibration, toxic substances, lighting, particulate matter etc.) can also be generalized as dangerous factors or workplaces hazards [1, 2, 3, 4]. In this article are presented some results obtained after workplaces hazards measurements in a production and sales bakery unit for the parameters: O2, SO2, CO, NH3, temperature, humidity, suspension powders, VOC. The values of the measured parameters particulate matter (0.17 mg/m3 - 0.30 mg/m3) respectively volatile organic compounds (0.8 ppm ÷ 21.1 ppm) were below the maximum allowable concentrations, which indicates a safe workplaces for employees. The other parameters measured values, respectively temperature and humidity, were between 22.100C - 29.20 C for temperature and 47% - 53% for humidity.

scholarly journals Defensive functions of volatile organic compounds and essential oils from northern white-cedar in China

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Liping Bai ◽  
Wenjia Wang ◽  
Juan Hua ◽  
Zhifu Guo ◽  
Shihong Luo
Keyword(s):  
Volatile Organic Compounds ◽  
Essential Oils ◽  
Organic Compounds ◽  
Pathogenic Fungi ◽  
Early Spring ◽  
Curvularia Lunata ◽  
Plant Communication ◽  
Volatile Organic ◽  
Cultivated Plant ◽  
High Concentrations

Abstract Background Plants are known to emit diverse volatile organic compounds (VOCs), which may function as signaling substances in plant communication with other organisms. Thuja occidentalis, which is widely cultivated throughout China, releases aromatic VOCs into the air in winter and early spring. The relationship of this cultivated plant with its neighboring plants is necessary for the conservation of biodiversity. Results (−)-α-thujone (60.34 ± 5.58%) was found to be the major component in VOCs from the Shenyang population. The essential oils (EOs) from the Kunming and Shenyang populations included the major components (−)-α-thujone, fenchone, (+)-β-thujone, and (+)-hibaene, identified using GC-MS analyses. (−)-α-thujone and (+)-hibaene were purified and identified by NMR identification. EOs and (−)-α-thujone exhibited valuable phytotoxic activities against seed germination and seedling growth of the plants Taraxacum mongolicum and Arabidopsis thaliana. Moreover, the EOs displayed potent inhibitory activity against pathogenic fungi of maize, including Fusarium graminearum, Curvularia lunata, and Bipolaris maydis, as well as one human fungal pathogen, Candida albicans. Quantitative analyses revealed high concentrations of (−)-α-thujone in the leaves of T. occidentalis individuals from both the Shenyang and Kunming populations. However, (−)-α-thujone (0.18 ± 0.17 μg/g) was only detected in the rhizosphere soil to a distance of 0.5 m from the plant. Conclusions Taken together, our results suggest that the phytotoxic effects and antifungal activities of the EOs and (−)-α-thujone in T. occidentalis certainly increased the adaptability of this plant to the environment. Nevertheless, low concentrations of released (−)-α-thujone indicated that reasonable distance of T. occidentalis with other plant species will impair the effects of allelochemical of T. occidentalis.

scholarly journals Characterization and Risk Assessment of Particulate Matter and Volatile Organic Compounds in Metro Carriage in Shanghai, China

Atmosphere ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 302 ◽  
Author(s):  
Yu Gong ◽  
Tao Zhou ◽  
Youcai Zhao ◽  
Bin Xu
Keyword(s):  
Particulate Matter ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Ventilation System ◽  
Air Filtration ◽  
Filtration System ◽  
Volatile Organic ◽  
Exposure Levels ◽  
Shanghai Metro ◽  
Metro System

Air quality in transportation microenvironment has received widespread attention. In this study, the exposure levels of volatile organic compounds (VOCs) and particulate matter that have a diameter of less than 2.5 micrometers (PM2.5) in Shanghai metro system were measured simultaneously, and their risks to human health under different driving conditions were then assessed. The results showed that VOCs, PM2.5 concentrations and life cancer risk (LCR) of four VOCs (benzene, formaldehyde, ethylbenzene, and acetaldehyde) in the old metro carriages were about 3 times, 3 times and 2 times higher than those in the new metro carriages, respectively. This difference can be ascribed to the fact that air filtration system in the new metro trains is significantly improved. The VOC levels, PM2.5 concentrations and LCR of VOCs on the above-ground track were slightly higher than those on the underground track. This is due to less outdoor polluted air entering into the carriage on the underground track. Number of passengers also had an effect on VOCs and PM2.5 concentrations in metro carriages. Additionally, the LCR of VOCs inside metro trains should not be ignored (7.69 × 10−6~1.47 × 10−5), especially inside old metro trains with the old ventilation system.

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