Aktaş O, Ceçen F
Bogaziçi University, Institute of Environmental Sciences, 34342, Bebek, Istanbul, Turkey.
Water Sci Technol. 2007;55(10):237-44. doi: 10.2166/wst.2007.327.
This study aims to clarify the effect of adsorbability, desorbability, biodegradability and activated carbon type on the extent of bioregeneration in the treatment of phenol. For this purpose, four different activated carbon types; one thermally activated and one chemically activated powdered carbon (PAC), and their granular countertypes (GAC) with similar physical characteristics were used. Adsorption isotherms showed that the thermally activated carbons, either in powdered or granular form, were better adsorbers for phenol than the chemically activated ones. However, adsorption was more irreversible in the case of thermally activated carbons. Bioregeneration of chemically activated carbons were found to be higher in accordance with their higher reversibility of adsorption showing that bioregeneration was controlled by the reversibility of adsorption. Bioregeneration efficiencies for the thermally activated carbons were much higher than their efficiencies of total desorbability. This indicated that some exoenzymatic reactions might have occurred so that phenol was bioregenerated more than expected.
本研究旨在阐明吸附性、解吸性、生物降解性和活性炭类型对苯酚处理中生物再生程度的影响。为此，使用了四种不同类型的活性炭；一种是热活化的，一种是化学活化的粉末活性炭（PAC），以及它们具有相似物理特性的颗粒状对应物（GAC）。吸附等温线表明，无论是粉末状还是颗粒状的热活化碳，对苯酚的吸附性能都优于化学活化碳。然而，热活化碳的吸附更不可逆。发现化学活化碳的生物再生率更高，这与其更高的吸附可逆性一致，表明生物再生受吸附可逆性控制。热活化碳的生物再生效率远高于其总解吸效率。这表明可能发生了一些胞外酶反应，使得苯酚的生物再生比预期的更多。
