Assessing the Effects of Silver Nanoparticles on Biological Nutrient Removal in Bench-Scale Activated Sludge Sequencing Batch Reactors

2014 ◽  
Vol 48 (2) ◽  
pp. 970-976 ◽  
Author(s):  
Christina L. Alito ◽  
Claudia K. Gunsch
Keyword(s):  
Silver Nanoparticles ◽  
Activated Sludge ◽  
Nutrient Removal ◽  
Biological Nutrient Removal ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Bench Scale

Demonstration of enhanced nutrient removal at two full-scale SBR plants

2004 ◽  
Vol 50 (10) ◽  
pp. 115-120 ◽  
Author(s):  
M. Peters ◽  
M. Newland ◽  
T. Seviour ◽  
T. Broom ◽  
T. Bridle
Keyword(s):  
Nutrient Removal ◽  
Full Scale ◽  
Biological Nutrient Removal ◽  
Batch Reactors ◽  
Simultaneous Nitrification And Denitrification ◽  
Sequencing Batch Reactors ◽  
Operational Control ◽  
The World ◽  
High Level ◽  
Operational Data

The efficacy of sequencing batch reactors (SBRs) to provide high levels of biological nutrient removal has been extensively demonstrated around the world. Environmental Solutions International (ESI) has now constructed over 20 full-scale SBR plants and has confirmed that nutrient removal is enhanced via the process of simultaneous nitrification and denitrification. Over 18 months of operational data from two plants, operating in distinctly different catchments, processing an average of between 2,000 and 2,500 m3/d of wastewater, has clearly shown the efficacy and robustness of the ESI SBR-BNR process. Median effluent total nitrogen and total phosphorus values of 3 mg/L and <0.6 mg/L, respectively, were demonstrated over the 18-month period. This high level of nutrient removal is attributed to the design of the bio-selector which maximises carbon storage for the subsequent denitrification reactions, the effective aeration control which ensures no over-aeration during the air-on cycle as well as the level of operational control provided at these two plants.

Enhanced biological nutrient removal in sequencing batch reactors operated as static/oxic/anoxic (SOA) process

2013 ◽  
Vol 143 ◽  
pp. 204-211 ◽  
Author(s):  
Dechao Xu ◽  
Hongbo Chen ◽  
Xiaoming Li ◽  
Qi Yang ◽  
Tianjing Zeng ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Biological Nutrient Removal ◽  
Batch Reactors ◽  
Sequencing Batch Reactors

scholarly journals Finding optimal algal/bacterial inoculation ratio to improve algal biomass growth with wastewater as nutrient source

Water SA ◽  
2019 ◽  
Vol 45 (4 October) ◽  
Author(s):  
Le Anh Pham ◽  
Julien Laurent ◽  
Paul Bois ◽  
Adrien Wanko
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Algal Biomass ◽  
Algal Growth ◽  
Total Biomass ◽  
Batch Reactors ◽  
Biomass Growth ◽  
Sequencing Batch Reactors ◽  
Solids Retention ◽  
Removal Efficiencies

Algal growth, nutrient removal and settling efficiency were quantified while inoculating sequencing batch reactors with a mixture of microalgae and bacteria (activated sludge). Three algae/bacteria inoculation ratios (5:1, 1:1 and 1:5) as well as pure algal biomass (control) were assessed. Algal biomass production increased with the addition of activated sludge. However, the addition of too much activated sludge can cause disturbance to the Al-Bac biomass growth and algal bacterial processes. All reactors including the control with only algae showed similar settling and nutrient removal efficiencies. Good settling was observed in all reactors with only 5% of total biomass found in supernatant after 1 h of settling. Removal efficiencies of COD, TN and PO4-P in all reactors were 79–82%, 61–65% and 15–37%, respectively, with the lowest phosphorus removal efficiency belonging to 1:5 algae/activated sludge ratio. These results may be due to both long hydraulic (7 days) and solids retention times (up to 30 days). Finally, Al-Bac biomass with 1:1 inoculation ratio showed the best enhancement in terms of biomass growth and algal activities.

Comparison of Biocenoses from Continuous and Sequencing Batch Reactors

1992 ◽  
Vol 25 (6) ◽  
pp. 239-249 ◽  
Author(s):  
J. Wanner
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Continuous Flow ◽  
Sequencing Batch Reactor ◽  
Flow System ◽  
Batch Reactor ◽  
Continuous Reactor ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Filamentous Microorganisms

Sequencing batch reactors (SBR) are often used for research on nutrient removal systems. A model anaerobic-oxic SBR was compared with a compartmentalized continuous-flow system. The levels of COD, phosphorus, and nitrogen removal in both systems were comparable but the biocenoses differed significantly. The SVI values of activated sludge from the continuous reactor ranged between 100 and 200 ml/g although no significant occurrence of filamentous microorganisms was observed. The sequencing batch reactor produced activated sludge with the SVIs below 100 ml/g and with high settling velocities. Filamentous microorganisms were frequently observed in the biocenosis of the SBR. The differences in settling properties and filamentous growth in both reactors are discussed and explained.

Effect of fermented swine wastes on biological nutrient removal in sequencing batch reactors

1997 ◽  
Vol 31 (7) ◽  
pp. 1807-1812 ◽  
Author(s):  
Sang-Ill Lee ◽  
Jong-Ho Park ◽  
Kwang-Baik Ko ◽  
Ben Koopman
Keyword(s):  
Nutrient Removal ◽  
Biological Nutrient Removal ◽  
Batch Reactors ◽  
Sequencing Batch Reactors

scholarly journals Influent with Particulate Substrate, Clean, Innocuous and Sustainable Solution for Bulking Control and Mitigation in Activated Sludge Process

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 984
Author(s):  
Pedro Cisterna-Osorio ◽  
Claudia Calabran-Caceres ◽  
Giannina Tiznado-Bustamante ◽  
Nataly Bastias-Toro
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Nutrient Deficiency ◽  
Microscopic Analysis ◽  
Volume Index ◽  
Favorable Effect ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Active Sludge ◽  
Chemical Reagents

This research studies the incidence of the type of substrate, soluble or particulate, in the emergence, development, and inhibition of bulking in activated sludge systems. It was evaluated using the sludge volume index (SVI), mixing liquor-suspended solids (MLSS), microscopic analysis of biomass, and effluent suspended solids (ESS). In the first experiment, four sequencing batch reactors (SBRs) were fed with soluble substrate at a fixed mass, while the mass of the particulate substrate varied, as those (saccharose mass/flour mass) ratios were 3:1, 3:2, 3:3 and 3:4., with a deficit ranging from 20 to 30% compared to the ratio recommended. The four SBRs have similar MLSS, IVL, and ESS. From day 30, with a deficit from 80 to 90%, the influents have ratios 1/1 and 1/2 until 48 days. The SBRs present IVL between 600 and 730 mL/g and ESS from 370 to 440 mg/L; unlike influents with ratios 1/3 and 1/4, they present IVL between 170 and 185 mL/g, and ESS from 260 to 270 mg/L. The favorable effect of particulate matter is categorical. In the second set of experiments, two SBRs were studied: SBR 1 fed with saccharose, and SBR 2 with flour; there is a lack of nutrients causing bulking in SBRs. Once the nutrient deficiency condition is changed in day 11 to excess, after 22 days, the SVI was 190 mL/g, ESS was 360 mg/L, and MLSS was 2000 mg/L for influents with saccharose; the influent with flour, with an SVI of 80 mL/g, ESS of 100 mg/L, and MLSS of 4000 mg/L, shows faster and more consistent recovery with the particulate substrate. Therefore, the proposal is to add particulate substrate-like flour to active sludge plants facing bulking. It is a clean, innocuous and sustainable alternative to processes that use chemical reagents.

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