A Study for Refinery Wastewater Treated by Bench-Top Fixed-Film Bioreactor System
| Autor: | Eei-Tar Cho, 邱于特 |
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| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 Biological fixed-film reactors（FFRs）is a very efficient and cost effective biological wastewater treatment technology. The FFR system we employ is an aerated packed-bed vessel containing an adherent（immobilized）microbial consortium. The cell mass is retained directly on and in the packing media by attaching to the packing’s fixed, solid surfaces to form a layer called the biofilm. The packing media in the FFR consists of a mixture of two plastic support systems. The use of mixed media facilitates high rates of oxygen, nutrient and pollutant transfer to and from the biomass. One packing support is a polyurethane foam（PUF）which allows a high concentration of immobilized biomass to develop. The other packing support consists of large-pore packing which is used to eliminate the problems of plugging and channeling, a major concern with other fixed-film systems, The FFR is designed as a quasi-plug flow system to minimized back-mixing and thus provide extremely low effluent pollutant concentrations. A fixed-film reactor system was constructed with a highly porous polyurethane foam to incubate microorganism concentration up to 8,000 mg/L. The support frame of the reactor system was build from cylindrical plastic pall rings to form a packed bed of “mixed-media.” The frame support provides a high surface area-to-volume ratio (210 ft2 / ft3). The bench-top FFR studies clearly demonstrated the highly effective nature of this fixed-film reactor for degrading the pollutants. The study for refinery wastewater treatment by bench-top fixed-film biological system could demonstrated the highy effective for degrading the pollutions at hydraulic retention time (HRT) of 2 ~3 hours. Chemical oxygen demand(COD) removal rate more than 90 % and phenol removal rate above 90 %. Another take of a view of bacteria, find it have quantity bacteria unit per foam in the reactor system. Microganism directed by groundwater educate for Acinetobacter junii、Ultramicrobacterium sp and Agromyces mediolanus, it treatment refinery wastewater rate more than by wastewater. At a time by elevated toxicity experiment detect, microganism have 80 % resolution power in bioreactor system for phenol concentration up to 600 mg/L, so bioreactor system in high toxicity experiment have capitally for tolerate and treatment efficient . |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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