Correlation between polyhydroxyalkanoates and extracellular polymeric substances in the activated sludge biosystems with different carbon to nitrogen ratio

2021 ◽  
pp. 108204
Author(s):  
Lanmei Zhao ◽  
Mutai Bao ◽  
Dong Zhao ◽  
Fenggang Li
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Carbon To Nitrogen Ratio ◽  
Nitrogen Ratio

scholarly journals Shifts in the Microbial Community of Activated Sludge with Different COD/N Ratios or Dissolved Oxygen Levels in Tibet, China

2019 ◽  
Vol 11 (8) ◽  
pp. 2284 ◽  
Author(s):  
Jin Xu ◽  
Peifang Wang ◽  
Yi Li ◽  
Lihua Niu ◽  
Zhen Xing
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Operational Taxonomic Unit ◽  
Carbon To Nitrogen Ratio ◽  
Urban Sewage ◽  
Treatment Performance ◽  
Nitrogen Ratio

In this study, we examined the influence of the organic carbon-to-nitrogen ratio (chemical oxygen demand (COD/N)) and dissolved oxygen (DO) levels on the removal efficiency of pollutants and on the change in total microflora in the cyclic activated sludge system (CASS) in the Nyingchi prefecture in Tibet. The results demonstrated that the treatment performance was the best when the COD/N ratio was 7:1 or the DO levels were 2–2.5 mg/L in comparison with four different tested COD/N ratios (4:1, 5:1, 7:1, and 10:1) and DO concentrations (0.5–1, 1–2, 2–2.5, and 2.5–3.5 mg/L). The treatment performance can be explained by the relative operational taxonomic unit richness and evenness of the microbial communities in activated sludge. Evident microbial variance was observed, especially different COD/N ratios and DO concentrations, which were conducive to the disposal of urban sewage in plateaus. The results help to understand sewage treatment under different COD/N ratios or DO concentrations on plateaus. This work provides practical guidance for the operation of any wastewater treatment plant on a plateau.

Optimization of the carbon to nitrogen ratio for mainstream deammonification and the resulting shift in nitrification from biofilm to suspension

2020 ◽  
Vol 6 (12) ◽  
pp. 3415-3427
Author(s):  
Paul Roots ◽  
Alex F. Rosenthal ◽  
Quan Yuan ◽  
Yubo Wang ◽  
Fenghua Yang ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Carbon To Nitrogen Ratio ◽  
Fixed Film ◽  
Nitrogen Ratio ◽  
Tin Removal

Mainstream deammonification performance in an integrated fixed film activated sludge (IFAS) reactor improved from 46% to 73% TIN removal after routing 10% of the primary effluent around the A-stage reactor.

Influence of carbon to nitrogen ratio on nitrous oxide emission in an Integrated Fixed Film Activated Sludge Membrane BioReactor plant

2018 ◽  
Vol 176 ◽  
pp. 1078-1090 ◽  
Author(s):  
Giorgio Mannina ◽  
George A. Ekama ◽  
Marco Capodici ◽  
Alida Cosenza ◽  
Daniele Di Trapani ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Nitrous Oxide Emission ◽  
Carbon To Nitrogen Ratio ◽  
Fixed Film ◽  
Nitrogen Ratio

scholarly journals Effects of carbon to nitrogen ratio on the performance and stability of aerobic granular sludge

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
HyunGu Kim ◽  
JiTae Kim ◽  
DaeHee Ahn
Keyword(s):  
Organic Matter ◽  
Removal Efficiency ◽  
Extracellular Polymeric Substances ◽  
Influencing Factor ◽  
Granular Sludge ◽  
Optical Microscope ◽  
Volume Index ◽  
Aerobic Granular Sludge ◽  
Carbon To Nitrogen Ratio ◽  
Nitrogen Ratio

The purpose of this study was to assess the nutrient salts removal efficiency and stability of the aerobic granular sludge (AGS) by change in C/N (carbon to nitrogen) ratio. The laboratory-scale experiments were performed to analyze the removal efficiencies for organic matter and contents of nitrogen, MLSS, sludge volume index, and extracellular polymeric substances (EPS) under C/N ratio conditions of 5.0, 10.0, 15.0, and 20.0. The microorganisms were observed using optical microscope and the microbial communities were analyzed using pyrosequencing. The increase in C/N ratio from 5.0 to 20.0 increased the organic matter and nitrogen removal efficiency to 95.9 and 79.1%, respectively. For the EPS contents, an influencing factor of granule stability, the polysaccharides to protein (PS/PN) ratio increased from 0.55 to 0.79. For the microbial community, the <i>Thauera</i> was the most common genus in ending phase occupying 63.7%. This microorganism is regarded as one contributing to organic matter degradation and improved production of EPS including AGS of microorganism, thus, may be an explanation of the results of this study such as increase in organic material in AGS and improvement of denitrification efficiency and contents of EPS with increase in C/N ratio.

Design Consideration Regarding Phosphate Removal in Activated Sludge Plants

1983 ◽  
Vol 15 (3-4) ◽  
pp. 319-328 ◽  
Author(s):  
James L Barnard
Keyword(s):  
Activated Sludge ◽  
Phosphate Removal ◽  
Practical Consideration ◽  
Design Consideration ◽  
Anaerobic Conditions ◽  
Carbon To Nitrogen Ratio ◽  
Proper Functioning ◽  
Ammonia Conversion ◽  
Nitrogen Ratio ◽  
Low Levels

This paper enumerates various practical consideration concerning the design and operation of activated sludge plants for the removal of phosphates. When phosphate removal is required without the conversion of ammonia to nitrates, either the Pho-strip or the Phoredox processes could be used. If ammonia conversion and/or the removal of nitrogen are also required, the use of the Phoredox process in combination with internal nitrification and denitrification would be required. Nitrates, when formed in the process should be removed to sufficiently low levels through internal denitrification so that they will not prevent anaerobic conditions of being maintained at all times in the anaerobic basin. Factors that may influence the proper functioning of the plant include temperature, pH, carbon to nitrogen ratio, septicity of the sewage, operator input, DO control, sludge age and clarifier design.

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