Analysis and Kinetics of the Sequencing Batch Reactors

Ndon, Udeme J

doi:10.1089/ees.2006.0096

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…In addition, the reactants are placed at the beginning of the experiment, and the product is obtained at the end. The continuous oscillatory movement of the parallel‐plate geometry assists the local mixing of the reactants 34–36 …”

Section: Resultsmentioning

confidence: 99%

“…The continuous oscillatory movement of the parallel-plate geometry assists the local mixing of the reactants. [34][35][36] Here, we investigate how continuous oscillation assists the gelation. To achieve this, along with usual time sweeps of continuous oscillation, we propose recording the gelation evolution in an interval fashion, that is, as an intermittent operation, in selected reaction conditions.…”

Section: Intermittent Versus Continuous Oscillatory Flowmentioning

confidence: 99%

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In situ evaluation of alginate‐Ca²⁺ gelation kinetics

Besiri

Goudoulas

Fattahi

et al. 2023

J of Applied Polymer Sci

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A thorough assessment of gelation progress requires real-time recording of biopolymer kinetics. In this study, an in situ investigation with a customized parallel-plate rheometric setup examines how the initial distribution of CaCl 2 to alginate through micro-holes affects the process. At constant volume and concentration of reactants, stiffer gels are produced at the same probing time by increasing the number of suppliers (2-12). Due to the oscillation and the different local distribution of the cations into the biopolymer solution, the development of gel front is affected, which is for the first time in situ rheologically investigated by the temporal evaluation of complex modulus, G*. The alternative configurations of the same number of micro-holes have drastically contribution to this regard, too. Moreover, a two-kernel equation is introduced predicting the alginate-Ca 2+ gelation kinetics. It represents the initial fast increase in G*, determined by the concentration of cross-linker, and the slow diffusion of cations to the assembled gelling structures depicted on the successive evolution of G* in longer times. Finally, a continuous and an intermittent oscillatory time sweep influence the diffusion of the cross-linking solution resulting in considerably different gelation curves for the same concentration of reactants.

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Section: Resultsmentioning

confidence: 99%

Section: Intermittent Versus Continuous Oscillatory Flowmentioning

confidence: 99%

In situ evaluation of alginate‐Ca²⁺ gelation kinetics

Besiri

Goudoulas

Fattahi

et al. 2023

J of Applied Polymer Sci

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“…A mathematical model was developed for the SBR system using these kinetics and assumptions by Udeme et al [35].…”

Section: Mathematical Model Developmentmentioning

confidence: 99%

Enhancement of SBR’s treatment under organic shock load

Ahmed,

ELKaramany,

Alged

2024

Preprint

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Organic shock loads often hinder biological wastewater treatment systems from meeting discharge standards, as a result, these systems frequently fail to achieve the required level of treatment so, the potential impact of these loads was investigated using laboratory-scale sequencing batch reactors (SBRs). Short-term (4.5 h) exposure to 721.25 - 1515.36 mg COD/L shock loads reduced the removal ratios of COD by 3.48 % – 31.73 % compared with the control. A mathematical model was developed for COD decomposition and the results obtained from the model were approximately close to the experimental data, and the maximum difference between the experimental and the theoretical removal rates was 3.36 % at a shock organic load of 1019.20 mg COD/L. In addition, the reactor performance was evaluated under successive organic shock loads so, a constant influent COD value of 1249.5 mg/L was applied for eight successive batch cycles and the results indicated that the removal ratio gradually improved with successive loading. As well, to enhance treatment efficiency under organic shock loads the performance of the reactor was evaluated for different MLSS concentrations of 2000, 2600, 3200, 3900, 4200, 4600, 4825, and 5250 mg/L. Three different organic shock loads with COD concentrations of 1043.04, 1205.36, and 1560 mg/L. COD removal ratios of 96.23 %, 86.18 %, and 75.81 % were achieved for the first, second, and third shock loads respectively at a MLSS concentration of 4825 mg/L however, it dropped when MLSS concentration increased to 5250 mg/L.

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“…Detailed cycle time configurations for the laboratory-scale SBRs can be 90 found in Table 1. During each cycle, 1.7 L effluent was decanted and replaced with synthetic sewage (i.e., 50% volumetric exchange ratio) giving a HRT of 1 day (Ndon, 2007). OECD synthetic sewage (Christofi et al, 2003;Gendig et al, 2003) was used as the feed for the lab-scale plant.…”

Section: Laboratory-scale Sequencing Batch Reactors (Sbrs)mentioning

confidence: 99%

The effect of anoxia and anaerobia on ciliate community in biological nutrient removal systems using laboratory-scale sequencing batch reactors (SBRs)

Dubber

Gray

2011

Water Research

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Please cite this article as: Dubber, D., Gray, N.F. The effect of anoxia and anaerobia on ciliate community in biological nutrient removal systems using laboratory-scale sequencing batch reactors (SBRs), Water Research (2011Research ( ), doi: 10.1016Research ( /j.watres.2011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractLittle is known about the effect of anaerobic and anoxic stages on the protozoan community in the activated sludge process and how this subsequently affects performance. Using a laboratory-scale BNR system the effect of different periods of anoxia on both the protozoan community and performance efficiency have been 15 examined. Four SBRs were operated at two cycles per day using a range of combined anoxic/anaerobic periods (0, 60, 120 to 200 min). Effluent quality (TOC, BOD, TP, TN, NH 4 -N, NO 3 -N and NO 2 -N), sludge settleability and ciliate community (species diversity and abundance) were analyzed over a periods of up to 24 days of operation. The species richness and total abundance of ciliates were found to decrease with longer 20 anoxic/anaerobic periods. Both, positive and negative significant correlations between the abundance of certain species and the period of anoxia was observed (e.g. Opercularia microdiscum, Epicarchesium granulatum), although other species (i.e. Acineria uncinata, Epistylis sp.) were unaffected by exposure to anoxia. In the laboratory-scale units, the 60 minute anoxic/anaerobic period resulted in good process performance (TOC and BOD 25 removal of 97 to 98% respectively), nitrification (80-90%), denitrification (52%) but poor levels of biological P removal (12%); with the protozoan community moderately affected but still diverse with high abundances. Increasing the length of anoxia to up to 200 min did not enhance denitrification although P removal rates increased to between 22-33%; however, ciliate species richness and total abundance both decreased and sludge 30 settleability became poorer. The study shows that activated sludge ciliate protozoa display a range of tolerances to anoxia that result in altered ciliate communities depending on the length of combined anoxic/anaerobic periods within the treatment process. It is recommended that anoxic/anaerobic periods should be optimized to sustain the protozoan community while achieving maximum performance and nutrient removal. 35

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Analysis and Kinetics of the Sequencing Batch Reactors

Cited by 6 publications

References 7 publications

In situ evaluation of alginate‐Ca²⁺ gelation kinetics

In situ evaluation of alginate‐Ca²⁺ gelation kinetics

Enhancement of SBR’s treatment under organic shock load

The effect of anoxia and anaerobia on ciliate community in biological nutrient removal systems using laboratory-scale sequencing batch reactors (SBRs)

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Analysis and Kinetics of the Sequencing Batch Reactors

Cited by 6 publications

References 7 publications

In situ evaluation of alginate‐Ca2+ gelation kinetics

In situ evaluation of alginate‐Ca2+ gelation kinetics

Enhancement of SBR’s treatment under organic shock load

The effect of anoxia and anaerobia on ciliate community in biological nutrient removal systems using laboratory-scale sequencing batch reactors (SBRs)

Contact Info

Product

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In situ evaluation of alginate‐Ca²⁺ gelation kinetics

In situ evaluation of alginate‐Ca²⁺ gelation kinetics