Response of Aerobic Granular Sludge to the Long-Term Presence of CuO NPs in A/O/A SBRs: Nitrogen and Phosphorus Removal, Enzymatic Activity, and the Microbial Community

2017 ◽  
Vol 51 (18) ◽  
pp. 10503-10510 ◽  
Author(s):  
Xiao-ying Zheng ◽  
Dan Lu ◽  
Wei Chen ◽  
Ya-jie Gao ◽  
Gan Zhou ◽  
...  
Keyword(s):  
Microbial Community ◽  
Enzymatic Activity ◽  
Phosphorus Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Cuo Nps

scholarly journals Efficient carbon, nitrogen and phosphorus removal from low C/N real domestic wastewater with aerobic granular sludge

2020 ◽  
Vol 305 ◽  
pp. 122961 ◽  
Author(s):  
Riccardo Campo ◽  
Sara Sguanci ◽  
Simone Caffaz ◽  
Lorenzo Mazzoli ◽  
Matteo Ramazzotti ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Domestic Wastewater ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal

Optimized aeration strategies for nitrogen and phosphorus removal with aerobic granular sludge

2013 ◽  
Vol 47 (16) ◽  
pp. 6187-6197 ◽  
Author(s):  
Samuel Lochmatter ◽  
Graciela Gonzalez-Gil ◽  
Christof Holliger
Keyword(s):  
Phosphorus Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal

scholarly journals Effect of Elevated Salt Concentrations on the Aerobic Granular Sludge Process: Linking Microbial Activity with Microbial Community Structure

2011 ◽  
Vol 77 (22) ◽  
pp. 7942-7953 ◽  
Author(s):  
J. P. Bassin ◽  
M. Pronk ◽  
G. Muyzer ◽  
R. Kleerebezem ◽  
M. Dezotti ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Phosphorus Removal ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Granular Sludge ◽  
Phosphate Removal ◽  
Aerobic Granular Sludge ◽  
Nitrogen And Phosphorus ◽  
Content Type

ABSTRACTThe long- and short-term effects of salt on biological nitrogen and phosphorus removal processes were studied in an aerobic granular sludge reactor. The microbial community structure was investigated by PCR-denaturing gradient gel electrophoresis (DGGE) on 16S rRNA andamoAgenes. PCR products obtained from genomic DNA and from rRNA after reverse transcription were compared to determine the presence of bacteria as well as the metabolically active fraction of bacteria. Fluorescencein situhybridization (FISH) was used to validate the PCR-based results and to quantify the dominant bacterial populations. The results demonstrated that ammonium removal efficiency was not affected by salt concentrations up to 33 g/liter NaCl. Conversely, a high accumulation of nitrite was observed above 22 g/liter NaCl, which coincided with the disappearance ofNitrospirasp. Phosphorus removal was severely affected by gradual salt increase. No P release or uptake was observed at steady-state operation at 33 g/liter NaCl, exactly when the polyphosphate-accumulating organisms (PAOs), “CandidatusAccumulibacter phosphatis” bacteria, were no longer detected by PCR-DGGE or FISH. Batch experiments confirmed that P removal still could occur at 30 g/liter NaCl, but the long exposure of the biomass to this salinity level was detrimental for PAOs, which were outcompeted by glycogen-accumulating organisms (GAOs) in the bioreactor. GAOs became the dominant microorganisms at increasing salt concentrations, especially at 33 g/liter NaCl. In the comparative analysis of the diversity (DNA-derived pattern) and the activity (cDNA-derived pattern) of the microbial population, the highly metabolically active microorganisms were observed to be those related to ammonia (Nitrosomonassp.) and phosphate removal (“CandidatusAccumulibacter”).

Impacts of variable pH on stability and nutrient removal efficiency of aerobic granular sludge

2015 ◽  
Vol 73 (1) ◽  
pp. 60-68 ◽  
Author(s):  
Monireh Lashkarizadeh ◽  
Giulio Munz ◽  
Jan A. Oleszkiewicz
Keyword(s):  
Removal Efficiency ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Acidic Ph ◽  
Alkaline Ph ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Ph Shock

The impact of pH variation on aerobic granular sludge stability and performance was investigated. A 9-day alkaline (pH = 9) and acidic (pH = 6) pH shocks were imposed on mature granules with simultaneous chemical oxygen demand (COD), nitrogen and phosphorus removal. The imposed alkaline pH shock (pH 9) reduced nitrogen and phosphorus removal efficiency from 88% and 98% to 66% and 50%, respectively, with no further recovery. However, acidic pH shock (pH 6) did not have a major impact on nutrient removal and the removal efficiencies recovered to their initial values after 3 days of operation under the new pH condition. Operating the reactors under alkaline pH induced granules breakage and resulted in an increased solids concentration in the effluent and a significant decrease in the size of the bio-particles, while acidic pH did not have significant impacts on granules stability. Changes in chemical structure and composition of extracellular polymeric substances (EPS) matrix were suggested as the main factors inducing granules instability under high pH.

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