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Biodegradation of oil wastewater by free and immobilized Yarrowia lipolytica W29

Journal of Environmental Sciences 2009年第2期21卷 237-242页

作者： WU Lan GE Gang WAN Jinbao College of Life Science Nanchang University Nanchang 330031 China College of Environmental Science and Engineering Nanchang University Nanchang 330031 China

The ability of Yarrowia lipolytica W29 immobilized by calcium alginate to degrade oil and chemical oxygen demand （COD） was examined. The degradation rules of oil and COD by immobilized cells with the cell density of 6.65 × 10^6 CFU/mL degraded 2000 mg/L oil and 2000 mg/L COD within 50 h at 30℃ （pH 7.0, 150 r/min）, similarly to those of free cells, and the degradation efficiencies of oil and COD by immobilized cells were above 80%, respectively. The factors affecting oil and COD degradation by immobilized cells were investigated, the results showed that immobilized cells had high thermostability compared to that of free cells, and substrate concentration significantly affected degrading ability of immobilized cells. Storage stability and reusability tests revealed that the oil degradation ability of immobilized cells was stable after storing at 4~C for 30 d and reuse for 12 times, respectively, the COD degradation rate of immobilized cells was also maintained 82% at the sixth cycle. These results suggested that immobilized Y lipolytica might be applicable to a wastewater treatment system for the removal of oil and COD.

关键词： Yarrowia lipolytica biodegradation oil wastewater calcium alginate

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Treating oil wastewater with pulse electro-coagulation flotation technology

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Journal of Chongqing University 2010年第1期9卷 41-46页

作者：向亚芳谢昭明 ZOU Yong College of Chemistry ＆ Chemical Engineering Changqing University Chongqing 400044 P. R. China

Pulse electro-coagulation flotation was used to treat oil wastewater of high oil *** operational conditions were examined,including current density,reactive time,electrode distance,pH and pole switching *** tests were carried out to identify the optimal operational conditions for this *** the treatment cost and efficiency together,the optimal operational conditions were an electrode distance of 3.3 cm,pH of 4,current density of 49.38 mA/cm2,reaction time of 15 min and pole switching time of 10 *** removal efficiency of oil wastewater under normal conditions reached up to 96.21%.The influences of different factors on removal efficiency were in the following decreasing sequence:pH> current density > pole switching time > reactive time > board distance.

关键词： oil wastewater electro-coagulation flotation oil removal efficiency

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Preparation of Porous Ceramisite for Waste Water Treatment Made from Red Mud

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Journal of Wuhan University of Technology(Materials Science) 2007年第1期22卷 31-34页

作者：肖波 Environmental College of Science and Engineering Huazhong University of Science and Technology

The porous ceramisites for wastewater treatment were made from red mud, which is the industrial waste discharged from the production of Al2O3. The sintering process and the degreasing experiments with porous ceramisites have been finished. The results show that the sintering temperature control is dominant for the preparation of the porous ceramisites. The optimal sintering temperature is between 1 110-1120℃, a narrow range. The surface of ceramists is distributed with a lot of coarse holes with diameters of about 1-10μm. Moreover, the sintering temperatures have a great influence on the efficiency of degreasing, and the curve between the sintering temperature and the efficiency ofdegreasing is like a parabola.

关键词： red mud porous ceramisite oil wastewater solid waste recycling technology

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