The acceleration of aerobic sludge granulation by alternating organic loading rate: Performance and mechanism

被引:12
作者
Wang, Jin Yi [1 ,2 ]
Zhao, Bin [1 ,2 ]
An, Qiang [1 ,2 ]
Dan, Qiao [1 ,2 ]
Guo, Jin Song [1 ,2 ]
Chen, You Peng [1 ,2 ]
机构
[1] Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400045, Peoples R China
[2] Chongqing Univ, Coll Environm & Ecol, Chongqing 400045, Peoples R China
关键词
Aerobic granular sludge (AGS); Alternating load; Granulation; Extracellular polymeric substances (EPS); EPS producing bacteria; EXTRACELLULAR POLYMERIC SUBSTANCES; GRANULES; WATER; AGGREGATION; STABILITY; REMOVAL; REACTOR;
D O I
10.1016/j.jenvman.2023.119047
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
As a highly promising treatment technology for wastewater, long start-up time is one of the bottlenecks hindering the widespread application of aerobic granular sludge (AGS). This study focused on exploring the possibility of alternating organic loading rate (OLR) in promoting AGS granulation. Under alternating OLR (3.6-14.4 kgCOD/ m3.d), AGS granulation was significantly accelerated. The mean granule size under alternating load reached 234.6 mu m at 17 d, while under constant OLR (7.2 kgCOD/m3.d), the mean granule size was only 179.2 mu m. Moreover, the granule size maintained continuous growth even when the alternating OLR was changed to constant OLR. Alternating load significantly increased the content of extracellular polymeric substances (EPS), especially proteins (PN) in tightly bound EPS (TB-EPS), which was likely the main reason for accelerating AGS granulation. Moreover, alternating load reduced the hydrophilicity of EPS and promoted the content of proteins secondary structures that favored aggregation in TB-EPS, which were also beneficial for granulation. Microbial community results showed that alternating load might promote the enrichment of EPS producing bacteria, such as Thauera, Brevundimonas and Shinella. Meanwhile, the content of enzymes that regulated amino acids metabolism also increased under alternating load, which might be related to the increase of PN in EPS. These results further demonstrated that alternating load promoted granulation through EPS.
引用
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页数:10
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