Degradation of oily sludge from a flotation unit by free and immobilized microorganisms |
| |
Authors: | S H Omar U Büdecker H-J Rehm |
| |
Institution: | (1) Institut für Mikrobiologie, Westfälische Wilhemms-Universität, Corrensstrasse 3, D-4400 Münster, Federal Republic of Germany;(2) Present address: Botany Department, Faculty of Science, Alexandria University, Alexandria, Egypt |
| |
Abstract: | Summary The degradation rate of hydrocarbons in oily sludge obtained from a flotation unit by free and immobilized cells in shaking flasks and in a stirred tank reactor was investigated. For the biodegration of 3.3% hydrocarbons free cells and cells immobilized on granular clay were used. Free cells needed 7–8 weeks to use 30% of the 3.3% hydrocarbons, whereas with immobilized cells the same result was obtained after 3–4 weeks only. In shaken flasks with high hydrocarbon concentrations (8%), immobilized Candida parapsilosis degraded 90% of the hydrocarbons in the oily sludge within 3 weeks, while free cells degraded only 27.5% in the same period. In degradation experiments with a bioreactor, free and immobilized cells of the isolate ISO-OS BÜ 20 showed better results compared to cultures in shaken flasks due to better aeration and mixing. Free cells degraded 50% of the 5% hydrocarbon-containing oily sludge in 7 weeks, whereas immobilized cells gave the same result after only 4 weeks.Offprint requests to: H.-J. Rehm |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|