Effects on Microbial Activity of Aerobic Granular Sludge (AGS) in High-Salinity Wastewater

The aerobic granular sludge (AGS) was used to remove pollutants (COD, NH3-N, TN and TP) in wastewater under different salinity in a sequencing batch reactor (SBR). The results show that: the salinity has a significant impact on the removal of COD and TN, and the removal rate declines to 60% and 56% respectively when the water salinity rises from 5g/L to15g/L. The NH3-N removal is not much affected by the salinity, and the average removal rate is 75%. TP removal rate changes little at low-salted environment (the salinity less than 10g/L), however, the rate declines heavily when the salinity gets more than 10g/L, 70% in 10g/L and 57% in 15g/L.

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Robustness of an aerobic granular sludge sequencing batch reactor for low strength and salinity wastewater treatment at ambient to winter temperatures

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2019.121454 ◽

2020 ◽

Vol 384 ◽

pp. 121454 ◽

Cited By ~ 7

Author(s):

Qiulai He ◽

Hongyu Wang ◽

Li Chen ◽

Shuxian Gao ◽

Wei Zhang ◽

...

Keyword(s):

Wastewater Treatment ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Granular Sludge ◽

Aerobic Granular Sludge ◽

Winter Temperatures ◽

Low Strength ◽

Salinity Wastewater

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The effects of high salinity on nitrogen removal and the formation characteristics of aerobic granular sludge

Environmental Engineering Research ◽

10.4491/eer.2019.233 ◽

2019 ◽

Vol 25 (5) ◽

pp. 659-667 ◽

Cited By ~ 3

Author(s):

HyunGu Kim ◽

DaeHee Ahn

Keyword(s):

Microbial Community ◽

Removal Efficiency ◽

Biological Treatment ◽

High Salinity ◽

Granular Sludge ◽

Suspended Solid ◽

Microbial Community Analysis ◽

Volume Index ◽

Aerobic Granular Sludge ◽

Mixed Liquor

This study investigated the biological treatment of high-salinity wastewater using aerobic granular sludge (AGS). The removal performance, AGS characteristics, and microbial community were examined under salinity conditions ranging from 0.5 to 3.0 wt.%. When the salinity was increased, the removal efficiency of the chemical oxygen demand did not change substantially. The mean removal efficiency of NH4+-N ranged from 43.7 to 72.6% during the operation period. As for the concentration of extracellular polymeric substances (EPS), the polysaccharide/protein (PS/PN) ratio increased from 0.37 to 0.57. The concentrations of the mixed liquor suspended solid (MLSS) and mixed liquor volatile suspended solid (MLVSS) were 4,560 and 3,170 mg/L, respectively, in the end phase, and the MLVSS/MLSS ratio decreased from 0.81 to 0.69. The sludge volume index (SVI30) decreased linearly from 88 to 58 mL/g. In the microbial community analysis, Nitrosomonas species accounted for 22.9% of the total bacteria in the initial phase, whereas Halomonas accounted for 43.2% in the end phase. Hence, the gradually increased salinity appears to facilitate the dominance of halophilic microorganisms in the long-term operation of an AGS-based biological treatment system and the stable retention of AGS.

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