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.

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.

scholarly journals Continuous Monitoring of Air Purification: A Study on Volatile Organic Compounds in a Gas Cell

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 934 ◽  
Author(s):  
Alaa Fathy ◽  
Marie Le Pivert ◽  
Young Jai Kim ◽  
Mame Ousmane Ba ◽  
Mazen Erfan ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
Air Purification ◽  
Gas Cell ◽  
Oxide Nanowires ◽  
Continuous Adsorption ◽  
Volatile Organic ◽  
Ftir Spectrometer ◽  
Preliminary Study

Air pollution is one of the major environmental issues that humanity is facing. Considering Indoor Air Quality (IAQ), Volatile Organic Compounds (VOCs) are among the most harmful gases that need to be detected, but also need to be eliminated using air purification technologies. In this work, we tackle both problems simultaneously by introducing an experimental setup enabling continuous measurement of the VOCs by online absorption spectroscopy using a MEMS-based Fourier Transform infrared (FTIR) spectrometer, while those VOCs are continuously eliminated by continuous adsorption and photocatalysis, using zinc oxide nanowires (ZnO-NWs). The proposed setup enabled a preliminary study of the mechanisms involved in the purification process of acetone and toluene, taken as two different VOCs, also typical of those that can be found in tobacco smoke. Our experiments revealed very different behaviors for those two gases. An elimination ratio of 63% in 3 h was achieved for toluene, while it was only 14% for acetone under same conditions. Adsorption to the nanowires appears as the dominant mechanism for the acetone, while photocatalysis is dominant in case of the toluene.

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.

Status and challenges in photocatalytic nanotechnology for cleaning air polluted with volatile organic compounds: visible light utilization and catalyst deactivation

2019 ◽  
Vol 6 (11) ◽  
pp. 3185-3214 ◽  
Author(s):  
Seunghyun Weon ◽  
Fei He ◽  
Wonyong Choi
Keyword(s):  
Volatile Organic Compounds ◽  
Visible Light ◽  
Organic Compounds ◽  
Catalyst Deactivation ◽  
Semiconductor Nanoparticles ◽  
Air Purification ◽  
Environmental Technology ◽  
Light Utilization ◽  
Volatile Organic

Photocatalysis that utilizes semiconductor nanoparticles is one of the promising environmental technology for air purification.

scholarly journals Kinetic studies on using photocatalytic coatings for removal of indoor volatile organic compounds

2019 ◽  
Vol 29 (5) ◽  
pp. 689-700 ◽  
Author(s):  
Zhuoying Jiang ◽  
Xiong (Bill) Yu
Keyword(s):  
Air Quality ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Environment ◽  
Visible Spectrum ◽  
Air Purification ◽  
Small Scale ◽  
Ambient Conditions ◽  
Functional Coating ◽  
Volatile Organic

Titanium dioxide (TiO2) is a known photocatalyst with a capability of decomposing organic substances. However, the photocatalysis of the pure TiO2 is not effective for the indoor environment due to a lack of the ultraviolet irradiation inside a building. Doping TiO2 with substance such as C, N, or metal can extend the threshold of the absorption spectrum to the visible spectrum region. Thus, doped-TiO2 is able to decompose volatile organic compounds (VOCs) under an indoor environment. To date, most experimental works reported on photocatalytic kinetics were conducted inside small-scale devices. The performance of air purification function under the actual indoor application scenery need to be further clarified. For this purpose, it is crucial to predict the performance of autogenous air quality improvements by visible light-driven photocatalyst for the actual applications. This work has developed a model to evaluate the performance of functional coating with photocatalyst in removing VOCs. Factors such as the effects of coating designs and indoor ambient conditions on the air purification efficiency were studied. This work demonstrates that doped-TiO2 photocatalytic coating is effective to improve the indoor air quality.

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.

An Investigation on the Efficiency of Air Purification Using a Biofilter with Activated Bed of Different Origin

2014 ◽  
Vol 35 (4) ◽  
pp. 435-445
Author(s):  
Alvydas Zagorskis ◽  
Rasa Vaiškūnaitė
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Natural Zeolite ◽  
Wood Chips ◽  
Air Purification ◽  
Filtration Time ◽  
Purification Efficiency ◽  
Volatile Organic ◽  
Filter Bed ◽  
Different Origin

Abstract Recent studies in the area of biological air treatment in filters have addressed fundamental key issues, such as a biofilter bed of different origin composed of natural zeolite granules, foam cubes and wood chips. When foam and zeolite are mixed with wood chips to remove volatile organic compounds from the air, not only biological but also adsorption air purification methods are accomplished. The use of complex purification technologies helps to improve the efficiency of a filter as well as the bed service life of the filter bed. Investigations revealed that microorganisms prevailing in biological purification, can also reproduce themselves in biofilter beds of inorganic and synthetic origin composed of natural zeolite and foam. By cultivating associations of spontaneous microorganisms in the filter bed the dependencies of the purification efficiency of filter on the origin, concentration and filtration time of injected pollutants were determined. The highest purification efficiency was obtained when air polluted with acetone vapour was supplied to the equipment at 0.1 m/s of superficial gas velocity. When cleaning air from volatile organic compounds (acetone, toluene and butanol), under the initial pollutant concentration of ~100 mg/m3, the filter efficiency reached 95 %.

Sign in / Sign up

Export Citation Format

Share Document