Abstract
Current extensive research on aerobic granular sludge (AGS) largely focuses on improving its microbial biodiversity, settlement behavior, nitrogen and phosphorus removal efficiency, and shock load resistance. Great challenges that have to be faced are the bottleneck of slow-speed granulation and easy disintegration after granulation, which are key to the extended application of AGS technology. In the present review, the typical morphological structures of AGS are firstly summarized as well as the granulation model hypotheses, and then, we analyze the dominant microflora and their spatial distribution features. The influencing factors on particle structure stability are discussed thereafter on a macro and micro scale. Prospects and future research trends are also discussed based on the current study results for AGS technology.
Highlights
Aerobic granular sludge (AGS) can form granular biopolymers by microbial selfaggregation under suitable conditions
The results showed that Acyl-homoserine lactones (AHLs) signaling molecules could promote extracellular polymeric substances (EPS) secretion and maintain the adhesion and stability of particles (Figure 5) [75,76]
The morphological structures of aerobic granular sludge (AGS) can be mainly grouped into three categories, namely, zoogloea, filamentous, and integrated-type AGS, corresponding to the different formation methods
Summary
Aerobic granular sludge (AGS) can form granular biopolymers by microbial selfaggregation under suitable conditions. A comprehensive review of the structural characteristics and stability of AGS will help us understand the connection between the morphological characteristics and influencing factors of the structural stability and find a common conclusion, which will speed up the process of the industrial large-scale application of AGS. This mini review firstly describes some typical morphological structures of AGS based on the granulation model hypotheses. Future research prospects and trends are proposed to promote future research and its industrial application
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