A new method to calculate the periodic steady state of sequencing batch reactors for biological wastewater treatment: Model development and applications

Dionisi, Davide; Rasheed, Adamu Abubakar; Majumder, Aniruddha

doi:10.1016/j.jece.2016.07.032

Cited by 12 publications

(8 citation statements)

References 28 publications

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“…Therefore, the treatment of Cd contamination in water has become a hot topic of environmental research in recent years [2][3][4][5][6][7]. Available sewage treatment methods mainly include extraction, [2][3][4][5] ion exchange, [5][6][7] biological treatment [8] and electrosorption [9,10]. Among these methods, electrosorption is considered the most effective method for sewage treatment.…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr ⁶⁺ ions from water by electrosorption on modified activated carbon fibre felt

et al. 2018

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Electrosorption is a novel desalination technique that has many advantages in the treatment of sewage. However, commercially available activated carbon electrodes for electrosorption commonly have low microporosity, poor moulding performance, and low adsorption and regeneration efficiency. Here, we evaluated a novel adsorbent material, activated carbon fibre felt (ACFF), for electrosorption of chromium ions (Cr6+) in sewage treatment. The ACFF was modified with 20% nitric acid and its modified structure was characterized. The modified ACFF was used as an adsorbing electrode to investigate its desalination effect by electrosorption. Results showed that compared with those of unmodified ACFF, the modified ACFF had more carbonyl and carboxyl groups and the specific surface area, average pore size and micropore volume of the modified ACFF also improved by 32.2%, 2.5% and 23.1%, respectively. The kinetics of Cr6+ adsorption conformed to the pseudo-second-order kinetic equation, and the adsorption isotherm conformed to the Langmuir model. In addition, the regeneration rate of the modified ACFF electrode was more than 94%. In conclusion, the modified ACFF exhibits excellent electrosorption and regeneration performance for Cr6+ removal from water and thus is of great value for promotion in sewage treatment.

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Section: Introductionmentioning

confidence: 99%

Removal of Cr ⁶⁺ ions from water by electrosorption on modified activated carbon fibre felt

et al. 2018

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“…In this section, we summarise the mass balances which were solved for the various process configurations. Derivation and explanation of the equations and their solution methods (Microsoft Excel, Solver add-in) are shown in our previous work (Dionisi, 2017;Dionisi et al, 2016).…”

Section: Mass Balancesmentioning

confidence: 99%

“…To fill this gap, this study is aimed at a theoretical comparison of the CAS and the SBR, identifying the expected analogies and differences in the performance of these processes for different operating parameters and process scenarios. The comparison is based on kinetic models of biological wastewater treatment and on the solution of steady-state mass balances, using, for the SBR, the method we developed for the calculation of the periodic steady state (Dionisi et al, 2016). SBR and CAS are compared for the processes for carbon removal and for carbon and nitrogen removal.…”

Section: Introductionmentioning

confidence: 99%

Model-based comparison of sequencing batch reactors and continuous-flow activated sludge processes for biological wastewater treatment

Sánchez

Vuono

Dionisi

2021

Computers & Chemical Engineering

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This study compares, based on mathematical modelling, continuous-flow activated sludge processes (CAS) and sequencing batch reactors (SBR). The steady-state or periodic steady-state of CAS and SBR processes is compared for a feed composed of readily or slowly biodegradable substrates, for carbon and for carbon and nitrogen removal. The simulations are carried out for different values of the SRT (solids residence time), HRT (hydraulic residence time), number of cycles and internal recycle. If the SRT is large enough, the SBR can remove the influent biodegradable COD completely, while the CAS has a residual effluent COD concentration. For carbon and nitrogen removal, the SBR can remove the ammonia completely while the CAS has a residual effluent ammonia concentration. For typical values of the operating parameters, the CAS gives higher total nitrogen removal than the SBR, which becomes comparable to the CAS only for a large number of cycles per day.

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“…This negatively affects the treatment processes taking place in biological reactors and can result in, for example, high COD values in the effluent; it may also disturb other treatment processes, such as phosphorus removal and biological denitrification. An unfavourable COD / BOD 5 ratio in sewage is due to a low water consumption in mountain hostels and a large amount of fats discharged from different restaurants located there [9][10][11][12][13][14]. It should also be mentioned that daily fluctuations in the sewage volume and the daily changes of pollutant concentrations in raw sewage are more diverse than during the peak tourist season.…”

Section: Sewage Characteristicsmentioning

confidence: 99%

“…Sludge presses or centrifuges are used for the mechanical dewatering of sludge at larger wastewater treatment plants. Centrifuges (working in a batch or in continuous mode) separate the solids from the liquid with gravitational and centrifugal forces while filter presses, squeeze water out of the sludge [14][15][16]. The wastewater treatment plant at West Spitsbergen (Polish Polar Station)…”

Section: Sludge Processingmentioning

confidence: 99%

Biovac® wastewater treatment plants in the mountain national parks

Wilk

Cimochowicz-Rybicka

2018

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This paper presents characteristics of the Biovac® wastewater treatment plants operating in the mountain areas of the Polish national parks (NP): Tatrzanski NP and Babiogórski NP as well as in the West Spitsbergen NP. On the basis of the laboratory tests performed on raw sewage and the final effluent the efficiency of the wastewater treatment plants was evaluated. It was found that high COD values and rather high COD / BOD5 ratios were observed in the raw sewage during an off-peak tourist season. The research has also shown that the Biovac® treatment plants (SBR technology) showed a high level of removal of pollutants from sewage discharged from mountain hostels.

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A new method to calculate the periodic steady state of sequencing batch reactors for biological wastewater treatment: Model development and applications

Cited by 12 publications

References 28 publications

Removal of Cr ⁶⁺ ions from water by electrosorption on modified activated carbon fibre felt

Removal of Cr ⁶⁺ ions from water by electrosorption on modified activated carbon fibre felt

Model-based comparison of sequencing batch reactors and continuous-flow activated sludge processes for biological wastewater treatment

Biovac® wastewater treatment plants in the mountain national parks

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A new method to calculate the periodic steady state of sequencing batch reactors for biological wastewater treatment: Model development and applications

Cited by 12 publications

References 28 publications

Removal of Cr 6+ ions from water by electrosorption on modified activated carbon fibre felt

Removal of Cr 6+ ions from water by electrosorption on modified activated carbon fibre felt

Model-based comparison of sequencing batch reactors and continuous-flow activated sludge processes for biological wastewater treatment

Biovac® wastewater treatment plants in the mountain national parks

Contact Info

Product

Resources

About

Removal of Cr ⁶⁺ ions from water by electrosorption on modified activated carbon fibre felt

Removal of Cr ⁶⁺ ions from water by electrosorption on modified activated carbon fibre felt