动力学参数的呼吸测量法：活性污泥絮体大小的影响

Respirometric measurement of kinetic parameters: effect of activated sludge floc size.

作者信息

Chu K H, van Veldhuizen H M, van Loosdrecht M C M

机构信息

Department of Chemical and Process Engineering, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.

出版信息

Water Sci Technol. 2003;48(8):61-8.

PMID:14682571

Abstract

The variation of activated sludge floc size with the mixing intensity of a mechanically stirred respirometer, expressed in terms of the mean energy dissipation rate, was characterized using a photometric dispersion analyzer. The floc size decreased rapidly when the energy dissipation rate was increased from 1.33 x 10(-3) to 2.68 x 10(-3) W/kg. Experiments were performed to investigate the effect of floc size on the oxygen saturation coefficient measured under the condition of acetate oxidation. The respirometric data were interpreted by considering only the kinetics of biochemical reactions. The variation of the oxygen saturation coefficient with mixing intensity was found to correlate with the variation of floc size with mixing intensity. The oxygen saturation coefficient was found to decrease from 0.23 to 0.08 mg/L when the mean energy dissipation rate was increased from 1.33 x 10(-3) to 2.68 x 10(-3) W/kg. The dependence of the oxygen saturation coefficient on floc size or mixing intensity suggests the presence of mass transfer resistances in large flocs.

摘要

使用光度色散分析仪对活性污泥絮体大小随机械搅拌呼吸计混合强度的变化进行了表征，混合强度以平均能量耗散率表示。当能量耗散率从1.33×10⁻³增加到2.68×10⁻³W/kg时，絮体大小迅速减小。进行实验以研究絮体大小对乙酸盐氧化条件下测得的氧饱和系数的影响。仅考虑生化反应动力学来解释呼吸测量数据。发现氧饱和系数随混合强度的变化与絮体大小随混合强度的变化相关。当平均能量耗散率从1.33×10⁻³增加到2.68×10⁻³W/kg时，氧饱和系数从0.23降至0.08mg/L。氧饱和系数对絮体大小或混合强度的依赖性表明大絮体中存在传质阻力。