Removal of chloride from fly ash produced in hazardous waste incineration by leaching and displacement washing in a vertical filter press
Kinnarinen, Teemu; Huhtanen, Mikko; Penttilä, Mika; Häkkinen, Antti (2013-01-11)
Post-print / Final draft
Kinnarinen, Teemu
Huhtanen, Mikko
Penttilä, Mika
Häkkinen, Antti
11.01.2013
Waste Management & Research
31
2
178-186
SAGE Publishing
School of Engineering Science
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© SAGE Publishing 2013
© SAGE Publishing 2013
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2018101138117
https://urn.fi/URN:NBN:fi-fe2018101138117
Tiivistelmä
Fly ash is generated in large quantities by waste incineration processes. Chloride is commonly present in the fly ash produced by the incineration of hazardous materials, such as polyvinylchloride plastic. Major difficulties related to the disposal and handling of fly ash include the high concentration of easily leachable chlorides, heavy metals and toxic compounds. In order to avoid adverse environmental effects from the disposal of fly ash, the content of soluble chlorides must be reduced. One of the most effective options for chloride removal is leaching and displacement washing in a filter press. The primary aim of this study was to obtain efficient removal of chloride from fly ash by utilizing a leaching and displacement washing process, carried out in a filter press. The secondary objective was to obtain high filtration capacities and low filter cake moisture contents. The slurry was prepared by mixing fly ash with water at an ash:water ratio of 1:2 and filtered to separate the solids from the liquid. After solid–liquid separation, most of the dissolved residual chloride was removed from the filter cake by washing the cake with fresh water in the second stage of separation. It was possible to remove up to 98% of the total chloride and to obtain sufficient filtration capacities. The residual moisture content of the filter cakes varied from 22 to 35 wt%, which meant that the cakes could be disposed of in landfill, or possibly utilized as a construction material.
Lähdeviite
Kinnarinen, T., Huhtanen, M., Penttilä, M., Häkkinen, A., Removal of chloride from fly ash produced in hazardous waste incineration by leaching and displacement washing in a vertical filter press, Waste Management & Research, 2013, 31(2): 178-186. DOI: 10.1177/0734242X12471098
Alkuperäinen verkko-osoite
http://journals.sagepub.com/doi/10.1177/0734242X12471098Kokoelmat
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