锥形和柱状流化床膨胀率对生物膜行为的影响.pdfVIP

39 4 Vol. 39 No. 4 20 10 7 Journal of China Universit y of M ining T e hnology Jul. 20 10 周丹丹, 董双石 ( , 130026) : 基于流体剪切力和颗粒流化特征对生物膜性质的重要影响, 分析并对比了与流体剪切力 和颗粒流化特征密切 关的床层膨胀率对锥形和柱状流化床生物膜行为的影响. 采用改变液 回流比的方法调节床层膨胀率, 研究了柱状流化床( CFB) 和锥形流化床( TFB) 生物膜反应器中 生物膜厚度生物量污染物去除效率悬浮生物质浓度和生物颗粒分布的情况. 结果表明: 当进 水的质量浓度为220 mg/ L, 水力停留时间45 min, 在 同的床层膨胀率下, T FB 与CFB 比生 物量高且稳定, 生物颗粒的分布更为均匀. 当床层膨胀率在 一定范围内变化时( 14% ~ 90% ) , TFB 对污染物质的去除率稳定在95% 以上, 较CFB 高15% ~ 20%. 床层膨胀率对悬浮生物质浓 度的影响的研究结果表明生物膜的脱落将使悬浮生物质浓度增加. : 锥形流化床; 柱状流化床; 膨胀率; 生物膜 + : U 6649 2 : A : 2010) Influen e of Expansion Ratio on Biofilm Performan e in a Cylindri al and a Coni al Fluidizedbed Rea tor ZHOU Dandan, DONG Shuangshi ( College of Environment and Resour es, Jilin University , Chang hun, Jilin 130026, China) Abstract : Based on the effe t of liquid shear stress and parti le fluidization har a teristi son the biofilm properties, the effe t of liquid shear stress and fluidized bed expansion ratio on the bio film pr operties in a tappered ( TFB) and ylindr i al fluidizedbed ( CFB) w ere ompared. T he hange in biofilm thi kness, ba teria population, suspended biologi al material, pollutant re moval r ate and bioparti le distribution w ere studied for both bed, w hen the fluidized bed expan sion ratio w as adjusted by hanging the re y ling ratio of liquid phase. T he r esults show ed that ba teria population w as higher and more steady in TFB ompar ed w ith that in CFB w ith same in expansion ratio , w hen COD of influent and hydro retention time w ere 220 mg/ L and 45 min, respe tively. T he COD removal fra tion in TFB maintained at up to 95%, w