Effect of Ozonation on Fungal Resistance of Bamboo and Oak

Abstract

Wood is gaining increased interest as a renewable building material. However, color changes, chemical and microbiological degradation can occur when lignocellulosic materials are exposed to environmental stressors such as ozone and elevated humidity. In this study, the effects of ozone treatment and solvent extraction on fungal growth rates of bamboo and oak flooring were investigated. One set of wood samples was extracted with a mixture of cyclohexane and ethanol solvents for 72 h to remove extractable compounds. Another set of materials was exposed continuously to ozone (2000 μL/m3 ± 63 μL/m3 for one to five weeks. Solvent-extracted and ozone-treated samples were incubated in closed chambers at 85 % ± 1 % RH and 30 oC ± 1oC and at 55 % ± 1 % RH and 30 oC ± 1oC. Incubated samples were removed at regular time intervals for fungal growth evaluation. Ozone treatment caused chemical changes in bamboo and oak, which appeared to reduce bamboo’s resistance to fungal attack. Longer ozone exposure led to higher susceptibility to fungal growth. Untreated and ozone-treated oak showed no evidence of fungal growth, suggesting that this wood may contain fungi-inhibitory compounds that are not removed by these treatments. Also, a delay in fungal growth on cyclohexane/ethanol-extracted bamboo was observed, probably due to the extraction process removing components that enhanced fungal growth.