Linked Life Data

12002448

Source:http://linkedlifedata.com/resource/pubmed/id/12002448

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9-10
pubmed:dateCreated
2002-5-10
pubmed:abstractText
The potential of fly ash to dechlorinate and destroy PCDD, PCDF and PCB was tested under oxygen deficient conditions in the laboratory. Specifically, two types of fly ash were compared, originating either from a fluidized bed incinerator using Ca(OH)2 spray (FA1), or a stoker incinerator without Ca(OH)2 impact (FA2). Results from the present study indicate that on FA2 type fly ash, the degradation processes of OCDD, OCDF and D10CB occurred primarily via dechlorination/hydrogenation up to temperature settings of 340 degrees C. In contrast, FAI type fly ash was found to effect both dechlorination and destruction of these compounds already at temperature settings of 260 degrees C. The dechlorination velocity of PCDD and PCDF did not differ significantly. However, the first dechlorination step of OCDF in the 1,9-position occurred faster compared to the first dechlorination step of OCDD. The isomer pattern resulting from the dechlorination processes was quite similar on both FAI and FA2, indicating that differences in alkalinity or elemental composition of the two types of fly ashes do not have a significant influence on the position of dechlorination. PCDD and PCDF dechlorination of the 2,3,7,8-positions was not favoured over dechlorination of the 1,4.6,9-positions on either type of fly ash. In contrast, dechlorination of PCB occurred predominantly on the toxicological relevant 3- and 4-positions. The dechlorination/destruction processes were completed on both types of fly ash at 380 degrees C within one hour, which correlates well with results obtained from actual plant operation practices.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0045-6535
pubmed:author
pubmed:issnType
Print
pubmed:volume
46
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1255-62
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Dechlorination and destruction of PCDD, PCDF and PCB on selected fly ash from municipal waste incineration.
pubmed:affiliation
Environmental Process Development Department, Ishikawajima-Harima Heavy Industries Co Ltd, Yokahama, Japan. roland_weber@ihi.co.jp
pubmed:publicationType
Journal Article