Evaluation of the Inverse Fluidized Bed Biological Reactor for Treating High-Strength Industrial Wastewaters

• 作者: Belay Woldeyes W?odzimierz Sokó?
• 来源期刊: 化学工程与科学期刊(英文)
• 学科: 地球科学
• 关键词: BIOLOGICAL WASTEWATER TREATMENT Aerobic WASTEWATER TREATMENT HIGH-STRENGTH Industrial WASTEWATERS Inverse BIOLOGICAL Reactor Fluidized Bed Bioreactor LOW-DENSITY Biomass Support
• 年，卷（期）: 2011,（4）
• 页码范围: 239-244
• 页数: 6页
• 分类号: X7

摘要

The aim of this work was to investigate the aerobic degradation of high-strength industrial (refinery) wastewaters in the inverse fluidized bed biological reactor, in which polypropylene particles of density 910 kg/m3 were fluidized by an upward flow of gas through a bed. Measurements of chemical oxygen demand (COD) versus residence time t were performed for various ratios of settled bed volume to reactor volume (Vb/VR) and air velocities u. The largest COD reduction, namely, from 54,840 to 2,190 mg/l, i.e. a 96% COD decrease, was achieved when the reactor was operated at the ratio (Vb/VR) = 0.55, air velocity u = 0.046 m/s and t = 65 h. Thus, these values of (Vb/VR), u and t can be considered as the optimal operating parameters for a reactor when used in treatment of high-strength refinery wastewaters. In the treatment operation conducted in a reactor optimally controlled at (Vb/VR) = 0.55, u = 0.046 m/s and t = 65 h, the conversions obtained for all phenolic constituents of the wastewater were larger than 95%. The conversions of about 90% were attained for other hydrocarbons.