李志华 Likes:

Affiliation of Author(s):

环境与市政工程学院

Journal:

Proceedings of IWA Cities of the future,Xi'an

Key Words:

中文关键字：aerobic granules，英文关键字：

Abstract:

Densification may be an alternative method for controlling sludge bulking; however, little information is available on the method. Various methods including different oxygen concentrations, surface velocities of aeration, calcium concentrations and extend starvation period were employed for triggering densification of filamentous sludge in this study. It was found that high surface velocity of aeration could effectively improve the settleability of filamentous sludge in the short term, which resulted in filamentous granulation, but could not avoid filamentous bulking even after granulation. Increase of calcium concentration could also improve the settleability by forming pigtail filaments colony in the short term, but could not trigger granulation. Extension of starvation period seems effective neither for the densification nor for granulation. Additionally, the network morphology of filaments was also examined. Results show that increased ovality of meshes formed by filaments frequently associated with dense structure of filamentous sludge. It was suggested that pigtail type of filamentous colony that thus increased the resistance to high shear force may encourage the densification of sludge.

Note:

李志华

First Author:

lizhihua

Indexed by:

Journal paper

Volume:

卷：

Issue:

期：

Page Number:

页：

Translation or Not:

no

Date of Publication:

2011-12-01