ISSN:
1476-5535
Keywords:
recycle
;
creosote
;
pentachlorophenol
;
extraction
;
biopolish
;
flash distillation
;
fractional distillation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Abstract A recycling process designed to recover wood fiber from discarded utility poles and cross ties was tested. Laboratory and field studies were conducted using a combined physical, chemical and microbiological protocol designed for the removal of creosote and pentachlorophenol wood preservatives from wood fiber. Woodchips produced in an industrial type wood chipper were batch extracted in methanol. The extractions successfully removed more than 95% of eight major creosote compounds contained within the woodchips. An initial combined concentration of 29 262 ppm during the extraction phase was reduced to 95 ppm in the laboratory study and to 1364 ppm in the field study. Biopolishing with a microbial consortium containing adapted strains from the generaPseudomonas, Flavobacterium andAcinetobacter further reduced the preservative concentration to 8 ppm and 200 ppm, respectively, with anthracene being the most recalcitrant compound in both studies. Pentachlorophenol-treated wood with an initial concentration of 1190 ppm, when subjected to the recycling process, yielded end product wood containing less than 2 ppm of the preservative. The solvent/preservative mixture (miscella) produced during the extraction process yielded a pure methanol fraction and a still bottom mixture when subjected to flash distillation. Fractional (vacuum) distillation of the still bottom mixture produced methanol, creosote, pentachlorophenol, and coal tar fractions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01570139
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