| Evaluation of porous ceramic as microbial carrier of biofilter to remove toluene vapor. | |
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MedLine Citation:
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PMID: 11286055 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Three kinds of porous ceramic microbe media are fabricated from fly ash, diatomite and a mixture of fly ash and diatomite powders. Water holding capacity, density, porosity, pore size and distribution, compressive strength and micro-structure of each of the fabricated media are measured and compared. The fly ash and diatomite mixture ceramic is evaluated as the best biofilter medium among the three media because of its high compressive strength. It is selected as an experimental biofilter medium inoculated with thickened activated sludge. The laboratory scale biofilter was operated for 42 days under various experimental conditions varying in inlet toluene concentration and flow rate of contaminated air stream. The experimental result shows that the removal efficiency reaches up to 96.6% after 4 days from the start-up. Nutrient limitation is considered as a major factor limiting biofilter efficiency. Biofilter efficiency decreases substantially at the build-up of backpressure, which is largely due to the accumulation of excess VSS within the media. Periodic backwashing of the biofilter is necessary to remove excess biomass and attain stable long-term high removal efficiency. The bed needs to be backwashed when the overall pressure drop becomes greater than 460.6 Pa at space velocity of 100 h-1. A maximum flow rate of 444.85 g m-3hr-1 of toluene elimination by the mixture ceramic biofilter, which is higher than the previously reported values. This indicates that the fly ash and diatomite mixture ceramic biofilter can be effectively applied for removing toluene vapor. |
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Authors:
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J S Lim; S J Park; J K Koo; H Park |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Environmental technology Volume: 22 ISSN: 0959-3330 ISO Abbreviation: Environ Technol Publication Date: 2001 Jan |
Date Detail:
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Created Date: 2001-04-04 Completed Date: 2001-04-26 Revised Date: 2007-03-21 |
Medline Journal Info:
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Nlm Unique ID: 9884939 Medline TA: Environ Technol Country: England |
Other Details:
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Languages: eng Pagination: 47-56 Citation Subset: IM |
Affiliation:
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Department of Civil Engineering, Korea Advanced Institute of Science and Technology, Taejon, 305-701, Korea. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Air Pollutants
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chemistry* Air Pollution / prevention & control Biofilms* Carbon / analysis Ceramics* / analysis, chemistry Diatomaceous Earth / analysis Filtration / instrumentation* Microscopy, Electron, Scanning Particulate Matter Powders Pressure Sewage Toluene / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Air Pollutants; 0/Ceramics; 0/Particulate Matter; 0/Powders; 0/Sewage; 108-88-3/Toluene; 61790-53-2/Diatomaceous Earth; 68131-74-8/fly ash; 68855-54-9/diatomite; 7440-44-0/Carbon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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