Open AccessPotentials of Liquefied CCB Treated Waste Wood for Wood Preservation
Author(s) -
Miha Humar,
Franc Budija,
David Hrastnik,
Boštjan Lesar,
Marko Petrič
Publication year - 2011
Publication title -
drvna industrija
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.287
H-Index - 19
eISSN - 1847-1153
pISSN - 0012-6772
DOI - 10.5552/drind.2011.1110
Subject(s) - chromated copper arsenate , biocide , preservative , pulp and paper industry , softwood , leaching (pedology) , waste management , trametes versicolor , hazardous waste , environmental science , chemistry , organic chemistry , engineering , laccase , soil science , soil water , enzyme
Recovered wood is frequently contaminated with biocides and therefore its use is limited. Even more, wood, impregnated with classical chromated copper arsenate (CCA) preservatives is classified as a hazardous waste, therefore solutions for reuse or recovery of this material are sought. One of the options, discussed in this paper is liquefaction and further applications of liquefied wood containing biocide remainings. In order to elucidate this possibilty, spruce and beech wood was impregnated with liquefi ed CCB treated and untreaded spruce wood of various concentrations and exposed to wood decay fungi according to the EN 113 procedure. In paralel, the leaching experiments (ENV 1250-2) were performed as well. The results do not clearly show that liquefied wood is bio-inactive. In most cases the mass loss by fungal attack is decreased compared to the untreated controls. On the other hand, copper leaching from spruce wood, impregnated with the liquefi ed CCB treated wood was significantly reduced. Thus, there are indications that the liquefied wood could be utilized as a binding agent for inorganic biocides.Prikupljeno uporabljeno drvo često je onečišćeno biocidima te je njegova ponovna uporaba ograničena. Osim toga, drvo impregnirano klasičnim krom-bakar-arsenat (CCA) zaštitnim sredstvima klasificirano je kao opasni otpad te je nužno pronaći rješenje za ponovnu uporabu ili sanaciju tako onečišćenog drva. Jedna od mogućnosti, prezentirana u ovome radu, jest utekućenje drva i daljnja primjena tako utekućenog drva koje sadržava preostale biocide. Radi razjašnjenja te mogućnosti, smrekovo i bukovo drvo impregnirano je utekućenom nezaštićenom smrekovinom i utekućenom smrekovinom zaštićenom krom-bakar-boratom različitih koncentracija. Tako obrađeno drvo izloženo je djelovanju gljiva, sukladno postupku opisanom u normi EN 113. Paralelno je proveden eksperiment ispiranja (ENV 1250-2). Rezultati istraživanja nisu jasno pokazali da utekućeno drvo nije bioaktivno. U većini je slučajeva gubitak mase zbog djelovanja gljiva smanjen u usporedbi s neobrađenim kontrolnim uzorcima. Osim toga, ispiranje bakra iz smrekovine impregnirane utekućenim drvom zaštićenim CCB-om znatno je smanjeno. Prema tomu, postoje znakovi da se utekućeno drvo može upotrijebiti kao vezivno sredstvo za anorganske biocide