改善气液传质效率实现丝状菌膨胀污泥控制的方法

Filamentous sludge bulking control by improving gas-liquid mass transfer efficiency

为了研究活性污泥系统中丝状菌的存在与污泥气液传质的关系,实验测量了不同絮体结构丝状菌污泥对体积溶氧传质系数(kLa)的影响,并考察了改善气液传质效率对控制丝状菌膨胀的影响。实验结果表明,丝状菌对气液传质的影响主要取决于丝状菌的沉淀性能而不是丝状菌的数量。在由于溶氧不足导致丝状菌膨胀的条件下,可以通过改善丝状菌絮体结构提高系统的气液传质效率,即通过絮体结构调控消除溶氧不足的外在条件,从而实现了控制丝状菌膨胀的目的。研究成果以改善丝状菌结构为手段,从微生物本身出发提高系统曝气效果,为控制丝状菌膨胀提供了新的思路。

In order to study the relationship between filamentous sludge and gas-liquid mass transfer efficiency in activated sludge systems,the volumetric oxygen transfer coefficient( kLa) of filamentous sludge with different floc structure were measured and the influence of gas-liquid mass transfer efficiency on filamentous bulking controlling was evaluated. The experimental results suggested that the effect of filamentous sludge on gasliquid mass transfer efficiency depends mainly on settleability rather than on the total length of filamentous bacteria. When filamentous sludge bulking was caused by low dissolved oxygen,the volumetric oxygen transfer coefficient could be increased by improving the filamentous floc structure,i. e.,elimination of the external conditions that caused the oxygen deficiency could be obtained by controlling the floc structure,and thus effectively controlled the sludge bulking. By means of improving the filamentous floc structure,it could effectively enhance the oxygen transfer coefficient from the view of microbe,and this finding provides a new way for filamentous bulking control.