scholarly journals INVESTIGATION OF EFFICIENCY OF AIR CLEANING FROM ACETONE USING A SEGMENTAL CONSTRUCTION BIOFILTER / ACETONO VALYMO IŠ ORO EFEKTYVUMO TYRIMAI, TAIKANT SEGMENTINĖS KONSTRUKCIJOS BIOFILTRĄ

2015 ◽  
Vol 7 (4) ◽  
pp. 380-384
Author(s):  
Denas Bacevičius ◽  
Alvydas Zagorskis
Keyword(s):  
Organic Compounds ◽  
Air Purification ◽  
Maximum Efficiency ◽  
Experimental Investigations ◽  
Test Results ◽  
Acetone Vapor ◽  
Cleaning Efficiency ◽  
Air Cleaning ◽  
Volatile Organic ◽  
Purification Unit

Volatile organic compounds, e. g. acetone, have a direct impact on climate change, decrease of ozone in the air, and on the growth of greenhouse effect. One of the most popular air purifying methods from VOC is a biological air cleaning. Experimental investigations were conducted to determine the efficiency of the new structure of biofilter with polypropylene plates segments. During the investigations the efficiency of segmental construction biofilter of air purification at different initial concentrations of pollutants was determined. Different concentrations of pollutants were estimated during the acetone dilution with water. During the tests the efficiency of biofilter air purification from acetone vapor and its change under different concentrations of vapors was set. Based on test results, the maximum efficiency of biofilter air purification was up to 93%. Studies have shown that increasing the allowable pollutant concentration, the efficiency of air purification unit decreases. Increasing the concentration of supplied acetone vapor into the biofilter from 232 to 701 mg/m3, cleaning efficiency decreased from 92.8 to 82.3%. Since microorganisms fail to oxidize organic compounds, the filter works better at lower initial concentrations of pollutants. Lakieji organiniai junginiai, tokie kaip acetonas, turi tiesioginę įtaką klimato kaitai, ozono kiekio ore mažėjimui, šiltnamio efekto susidarymui. Vienas populiariausių oro valymo nuo LOJ metodų yra biologinis oro valymas. Eksperimentiniai tyrimai atlikti siekiant nustatyti naujos konstrukcijos biofiltro, užkrauto polipropileno plokštelių segmentais, efektyvumą. Tyrimų metu buvo nustatinėjamas segmentinės konstrukcijos oro valymo biofiltro efektyvumas, esant skirtingoms pradinėms teršalo koncentracijoms. Skirtingos teršalo koncentracijos gautos acetoną skiedžiant vandeniu. Bandymų metu nustatytas biofiltro oro valymo nuo acetono garų efektyvumas, jo kaita esant skirtingoms garų koncentracijoms. Remiantis bandymų rezultatais, didžiausias nustatytas biofiltro oro valymo efektyvumas siekė 93 %. Tyrimų metu nustatyta, kad didinant leidžiamo teršalo koncentraciją, įrenginio valymo efektyvumas mažėja. Padidinus į biofiltrą tiekiamų acetono garų koncentraciją nuo 232 iki 701 mg/m3, valymo efektyvumas sumažėjo nuo 92,8 iki 82,3 %. Kadangi mikroorganizmai nespėja oksiduoti organinių junginių, filtras geriau veikia esant mažesnėms pradinėms teršalų koncentracijoms.

Determination of the Emission of Volatile Organic Compounds from Leather Seats in Environmental Test Chamber

2018 ◽  
Vol 768 ◽  
pp. 31-35
Author(s):  
Jin Wang ◽  
Zhen Zhu Ma ◽  
Lu Chen ◽  
Hong Juan Sun ◽  
Wu Kun Fan
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Test Chamber ◽  
Paper Analysis ◽  
National Standard ◽  
Test Results ◽  
Total Volatile Organic Compound ◽  
Volatile Organic ◽  
Environmental Test

With reference to the international standard ISO16000-9 and the national standard GB/T 31106-14, this paper has chosen leather seats as the research object in order to study the emission of volatile organic compounds (VOCs) and total volatile organic compound (TVOC). The test results show that about 21 species of VOCs released from the leather seats were measured, including several types of aldehydes, ketones, aromatic hydrocarbon ,hydrocarbon, lipids and so on.This paper analysis the possible sources of volatile organic compounds in leather seats as well.

Adsorption of chlorinated volatile organic compounds on hydrophobic faujasite: correlation between the thermodynamic and kinetic properties and the prediction of air cleaning

1998 ◽  
Vol 25 (1-3) ◽  
pp. 169-177 ◽  
Author(s):  
Benoı̂t Clausse ◽  
Bénédicte Garrot ◽  
Cédric Cornier ◽  
Christian Paulin ◽  
Marie-Hélène Simonot-Grange ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Kinetic Properties ◽  
Chlorinated Volatile Organic Compounds ◽  
Air Cleaning ◽  
Volatile Organic

Experimental Study of Droplet Biofilter Packed with Green Sphagnum

2017 ◽  
Author(s):  
Erika Petrauskaitė ◽  
Rasa Vaiškūnaitė
Keyword(s):  
Experimental Study ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Lower Layer ◽  
High Flow ◽  
Plant Structure ◽  
Waste Gas ◽  
Air Cleaning ◽  
Volatile Organic ◽  
Different Types

Air cleaning from VOC (volatile organic compunds) group of contaminants could be done by using different types of methods: adsoption, absorption, chemical or thermal oxidation. However, the most promising method is biological air cleaning. Biofilters have found most of their success in the treatment of dilute high-flow waste gas sreams containing odors or volatile organic compounds. To evaluate the meaning of the applicability of green sphagnum use in the droplet biofilter we will make the research. Sphagnum as a plant has big capabilities to absorb water and hold it in the porous parts plant structure. This characteristic of the plant could affect the water flow in the lower layer of the biolfiltrer and in this case will change the possibility to microorganisms to create right envinment to absorb and degrade the polluted air. The main aim of this research is the experimental study of droplet biofilter packed with green sphagnum.

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 INVESTIGATION AND ANALYSIS OF AIR-CLEANING BIOFILTER HYBRID BIOCHARGE QUANTITATIVE AND QUALITATIVE PARAMETERS / ORO VALYMO BIOFILTRO MIŠRIOS ĮKROVOS KIEKYBINIŲ IR KOKYBINIŲ MIKROBIOLOGINIŲ PARAMETRŲ TYRIMAI / ИССЛЕДОВАНИЕ КОЛИЧЕСТВЕННЫХ ИК А ЧЕСТВЕННЫХ МИКРОБИОЛОГИЧЕСКИХ ПАРАМЕТРОВВОЗДУХООЧИСТНОГО БИОФИЛЬТРА ПРИ СМЕШАННОЙ ЗАГРУЗКЕ

2011 ◽  
Vol 19 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Aušra Zigmontienė ◽  
Lukas Žarnauskas
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Saline Solution ◽  
Hydrogen Ions ◽  
Alcohol Group ◽  
Mould Fungus ◽  
Air Cleaning ◽  
Wood Shavings ◽  
Volatile Organic ◽  
Cleaning Device

Investigation of microorganism quantitative and qualitative parameters in the hybrid load of the biofilter allows improving the parameters of one of the most effective and cheapest air cleaning technologies of volatile organic compounds (VOCs)—biofiltration process. The point of biofiltering is the partitioning of volatile organic compounds during the metabolism of microorganisms. In pursuance to assure the best conditions for their growth, the biofilter is loaded with biocharge mixture made of zeolite, foam and wood shavings. The device is filled with VOCs mixture consisting of: acetone of ketone group; butanol of alcohol group and xylene of aromatic carbohydrate group. The optimal temperature of 30 °C is sustained in the air-cleaning device as well as neutral concentration of hydrogen ions (pH 6.9–7.1), biocharge mixture is irrigated with mineral saline solution. The investigation results show that the biofilter is operating most effectively 8 weeks after the end of its activation. The most propitious conditions for growing in the first biofilter cassette is when mould fungus and bacteria cultures have grown, the distribution percentage of which is respectively 5.3% and 94.7% in regard to all grown colonies. The most acceptable for mould is the faction of zeolite granules and activated synthetic foam cubes for bacteria. Santrauka Mikroorganizmų biofiltro mišrios įkrovos kiekybinių ir kokybinių parametrų tyrimai leidžia tikslingiau įvertinti vienos iš efektyviausių ir pigiausių LOJ (lakiųjų organinių junginių) valymo iš oro technologijų – biofiltracijos proceso parametrus. Biofiltracijos proceso esmė – LOJ skaidymas vykstant mikroorganizmų metabolizmui. Siekiant užtikrinti palankiausias sąlygas jiems augti, kaip biofiltro bioįkrova panaudota ceolito, porolono ir medienos drožlių mišinys. Į įrenginį buvo leidžiamas LOJ mišinys, į kurio sudėtį įėjo: ketonų grupei priklausantis acetonas; alkoholių grupei – butanolis ir aromatinių angliavandenilių grupei – ksilenas. Oro valymo įrenginyje buvo palaikoma optimali 30 °C temperatūra, neutralivandenilio jonų koncentracija (pH 6,9–7,1), bioįkrovos mišinys drėkintas mineralinių druskų tirpalu. Tyrimų rezultatairodo, kad biofiltras efektyviausiai veikia praėjus 8 savaitėms nuo jo aktyvinimo. Užaugus pelėsinių grybų ir bakterijų kultūroms (jų procentinis pasiskirstymas įrenginyje yra 5,3 % ir 94,7 % visų užaugusių kolonijų atžvilgiu) nustatyta, kad palankiausios sąlygos augti pirmoje biofiltro kasetėje. Pelėsiams tinkamiausia ceolito granulių frakcija, o bakterijoms – suaktyvinti sintetiniai porolono kubeliai. Резюме Исследование количественных и качественных параметров микроорганизмов при смешанной загрузке биофильтра позволяет совершенствовать параметры одной из самых эффективных и дешевых технологий по очисткевоздуха от летучих органических соединений (ЛОС) – процесса биофильтрации. Суть процесса биофильтрациизаключается в расщеплении ЛОС в процессе метаболизма микроорганизмов. В целях обеспечения самых благоприятных условий для их роста биофильтр загружался биологической смесью из цеолита, поролона и древеснойстружки. В устройство вводилась смесь ЛОС, в состав которой входил ацетон (группа кетонов), бутанол (группа спиртов) и ксилен (группа углеводородов). В воздухоочистном устройстве поддерживалась оптимальная температура (30 oC), нейтральная концентрация ионов водорода (pH 6,9–7,1), биологическая загрузочная смесь смачивалась раствором минеральных солей. Полученные результаты свидетельствовали о том, что наиболее эффективнобиофильтр работает спустя 8 недель после окончания его активизации. После того, как культуры грибков плесении бактерий, процентное распределение которых в устройстве соответственно было равно 5,3% и 94,7% относительно всех выращенных колоний, выросли, наиболее благоприятными для роста оказались условия в первой кассете биофильтра. Для плесени наиболее приемлемой оказалась фракция гранул цеолита, а для бактерий –активизированные кубики синтетического поролона.

scholarly journals EXPERIMENTAL STUDY OF DROPLET BIOFILTER PACKED WITH GREEN SPHAGNUM TO CLEAN AIR FROM VOLATILE ORGANIC COMPOUNDS

2017 ◽  
Author(s):  
Erika PETRAUSKAITĖ ◽  
Rasa VAIŠKŪNAITĖ
Keyword(s):  
Air Quality ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Experimental Research ◽  
Treatment Technology ◽  
Air Cleaning ◽  
Compound Pollution ◽  
Volatile Organic ◽  
Clean Air ◽  
Promising Treatment

Volatile organic compound pollution is one of the problems of outdoor and indoor environment air quality. In order to maintain good air quality, air cleaning technologies are being engaged. One of the recent biological air treatment technology is biofiltration. It is a promising treatment of air from volatile organic compounds (VOCs). Experimental research of droplet biofilter for cleaning VOCs was carried out. Biofilter load of green sphagnum was used with the aim to clean three different concentrations of pollutant toluene. Measurements of biofiltration processes were recorded after 20 and 40 days. The aim of this experimental research is to estimate biofilter efficiency using green sphagnum as a load material.

scholarly journals PLASMA COATING FORMED TIO2 CATALYSTS USAGE IN CLEANING THE AIR FROM NITROGEN OXIDES AND CARBON MONOXIDE / PLAZMINIU PURŠKIMU SUFORMUOTŲ TIO2 KATALIZATORIŲ TAIKYMAS VALANT IŠ ORO AZOTO OKSIDUS IR ANGLIES MONOKSIDĄ

2015 ◽  
Vol 7 (4) ◽  
pp. 365-371
Author(s):  
Vitalij Kolodynskij ◽  
Pranas Baltrėnas
Keyword(s):  
Carbon Monoxide ◽  
Nitrogen Oxides ◽  
Plasma Coating ◽  
Air Purification ◽  
Average Flow Rate ◽  
Cleaning Efficiency ◽  
Average Flow ◽  
Air Cleaning ◽  
Air Stream ◽  
Cleaning Device

The present catalytic air purification device–air cleaning device is capable to reduce nitrogen oxide sand carbon monoxide concentrations in polluted air stream and to achieve high cleaning efficiency. The principle of operation of catalytic air cleaning device is based on plasma coating formed catalysts usage. At high temperatures and oxygen concentrations in the experimental device channel, catalysts become active and reactions of conversion of pollutants start. In this research, the efficiency of cleaning the air from nitrogen oxides and carbon monoxide, by using plasma coating formed titanium oxide and copper-chromium catalysts, is carried out. 50% propane – 50% butane gas mix was used to generate polluted air flow. The maximum cleaning efficiency, cleaning the air of nitrogen oxides and carbon monoxide, reached 86% and 77%, when the average flow rate of polluted air was 0.10 m/s, oxygen concentration in II section of device was 0.5–0.6% and in I section – 0.1–0.2%. Nagrinėjamas įrenginys – katalitinis oro valymo įrenginys, mažinantis azoto oksidų ir anglies monoksido koncentracijas užterštame oro sraute. Katalitinis oro valymo įrenginys veikia naudodamas plazminiu purškimu suformuotus katalizatorius. Esant aukštai temperatūrai ir optimaliai deguonies koncentracijai įrenginio eksperimentiniame kanale, katalizatorių paviršius tampa aktyvus, ir vyksta sudėtingos teršalų konversijos reakcijos. Atliktuose tyrimuose nagrinėtas suminis titano oksido ir vario-chromo oksido katalizatorių, kurie buvo pagaminti plazminio purškimo metodu, srauto, užteršto azoto oksidais ir anglies monoksidu, valymo efektyvumas. Užterštam oro srautui sugeneruoti buvo naudojamas 50 % propano – 50 % butano dujų mišinys. Didžiausias valymo efektyvumas, valant orą nuo azoto oksidų ir anglies monoksido, atitinkamai siekė 86 % ir 77 %, esant 0,10 m/s vidutiniam užteršto srauto greičiui, 0,5–0,6 % deguonies koncentracijai II-ojoje įrenginio sekcijoje ir 0,1–0,2 % deguonies koncentracijai I-ojoje įrenginio sekcijoje.

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.

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