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

Abstract

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.

Optimal detuning of multivariable proportional integral controller based on data‐driven approach for an activated sludge process

“…4 Approximately 47%-70% of the total energy consumption during the treatment process is due to aerobic process. 5 Generally, as the biological activity progresses, the DO concentration diminishes, leading to an increase in the filamentous microorganism. The turbidity level increases gradually during this stage, thereby reducing the effluent quality.…”

“…The dissolved oxygen (DO) concentration is the most influencing parameter in any biological system that includes an aeration chamber 4 . Approximately 47%–70% of the total energy consumption during the treatment process is due to aerobic process 5 . Generally, as the biological activity progresses, the DO concentration diminishes, leading to an increase in the filamentous microorganism.…”

Comparison of Optimisation Algorithms for Centralised Anaerobic Co-Digestion in a Real River Basin Case Study in Catalonia

“…This potential for biogas generation could be translated as well to a source of renewable natural gas, which has specific composition requirements that demand high-tech sensors to assure its quality no matter its origin, as those developed in [15,16]. Due to their potential for resource recovery and the further implications in the water-food-energy nexus, WWTPs have been a research focus from different areas of Sensors 2022, 22, 1857 2 of 20 expertise: from modelling and engineering design [17][18][19][20][21][22][23][24] to process dynamics, simulation and integration [25][26][27][28].…”

Sliver Doped Sodium Antimonate with Greatly Reduced the Band Gap for Efficiently Enhanced Photocatalytic Activities Under Visible Light (Experiment and DFT Calculation)

“…If this kind of wastewater is discharged directly or treated improperly, it would cause serious harm to environmental safety and human health. At present, many techniques, including biological process 4,5 , physical chemical combination method 3,6 , adsorption [7][8][9] , membrane separation 10,11 , advanced oxidation [12][13][14] , photocatalytic degradation 15,16 , could be used to treat organic wastewater. Each of these approaches has its own advantages and disadvantages.…”