基于溶解氧微电极的动态膜特性的在线研究方法

自生动态膜-生物反应器是一种将粗网材料制成的组件置于反应器中进行泥水分离的生物处理工艺.粗网材料表面形成的动态膜不仅能有效去除浊度,还具有生物活性,可以降解污染物.通过微电极技术,可以研究动态膜的生物活性.为便于微电极在线测量,构建微型反应器模拟动态膜的实际过滤过程,结合微动平台,采用溶解氧微电极测量动态膜内的溶解氧分布.结果表明,动态膜在反应器运行过程中结构发生变化,出现气泡.动态膜内溶解氧浓度随深度的增加而降低,在2.0～2.5mm深度处降至0.动态膜表层微生物的比耗氧速率在反应器运行第1、5和8天分别为34.3、10.6和12.4mg/(g·h).

Characteristics of Dynamic Membrane Based on Oxygen Microelectrode

Self-forming dynamic membrane coupled bioreactor is a technology using coarse pore-sized material modules to separate solid and liquid in the activated sludge. The cake layer formed on the coarse pore-sized material, i.e. dynamic membrane, can remove turbidity efficiently and some organic pollutants. Its biological activity can be studied by microelectrode. For measurement in-situ, a small bioreactor is designed to simulate the real filtration process. A microelectrode with micromanipulator is used to measure the dissolved oxygen profile in the dynamic membrane. The results indicate that bubble emerged in the dynamic membrane during operation of bioreactor. The dissolved oxygen concentration decreased with the increasing depth, and fell to 0 at 2.0 - 2.5mm depth. The specific oxygen uptake rates of the surface part of dynamic membrane were calculated to be 34.3, 10.6 and 12.4 mg/(g x h) respectively at the 1st, 5th and 8th day of the filtration.