Promotion and inhibition of oxygen transfer under fine bubble aeration by activated sludge

作者：Fan, Haitao; Qi, Lu; Liu, Guo hua; Zhang, Yuankai; Chen, Xulu; Wang, Hongchen^*

来源：Water and Environment Journal, 2014, 28(3): 434-441.

DOI：10.1111/wej.12061

• activated sludge
• fine bubble aeration
• microbial respiration
• MLSS
• oxygen mass transfer

The promotion and inhibition of inactivated and activated sludge on oxygen mass transfer (OMT) were studied using lab-scale experiments. The results showed that the a-values and oxygen transfer efficiency (OTE) decreased with increasing mixed liquor suspended solids (MLSS) concentration (1-10 g/L). Although OMT promotion rate by microbial respiration in activated sludge system increased from 39.8-97.5% for the a-values and OTE, the two parameters were found to fall sharply when MLSS concentration was over 5 g/L. This indicated that the sludge concentration is a major influence factor on OMT in activated sludge system. Such results provide valuable knowledge for the operating optimization of the aeration system in waste-water treatment process.

• 出版日期2014-9
• 单位中国人民大学