Oxygen transfer efficiency in an aerobic granular sludge reactor: Dynamics and influencing factors of alpha

Strubbe, Laurence; Dijk, Edward J.H. van; Deenekamp, Pascalle J.M.; Loosdrecht, Mark C.M. van; Volcke, Eveline

doi:10.1016/j.cej.2022.139548

Cited by 12 publications

(5 citation statements)

References 46 publications

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“…(2021) investigated the aeration performance of an aerobic granular sludge reactor and found that the oxygen transfer efficiency increases along each cycle. This finding was confirmed by long-term data analysis, analysing the average aeration performance increase in time, along each cycle, for 175 batch cycles of an aerobic granular sludge process [ 18 ]. A similar increase was reported along the tank for an activated sludge process [ 19 ] — the spatial component similar to the time component in the aerobic granular sludge process cycle.…”

Section: Combining Off-gas Measurements and Mass Balancesmentioning

confidence: 63%

“…A similar increase was reported along the tank for an activated sludge process [ 19 ] — the spatial component similar to the time component in the aerobic granular sludge process cycle. The increase in the aeration efficiency in time/space is the decrease in surfactants, specifically the soluble biodegradable organic carbon [ 18 ].…”

Section: Combining Off-gas Measurements and Mass Balancesmentioning

confidence: 99%

See 1 more Smart Citation

Synergies from off-gas analysis and mass balances for wastewater treatment — Some personal reflections on our experiences

Volcke

2024

Environmental Science and Ecotechnology

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Section: Combining Off-gas Measurements and Mass Balancesmentioning

confidence: 63%

Section: Combining Off-gas Measurements and Mass Balancesmentioning

confidence: 99%

Synergies from off-gas analysis and mass balances for wastewater treatment — Some personal reflections on our experiences

Volcke

2024

Environmental Science and Ecotechnology

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“…Undoubtedly, this finding is also supported by the economies of scale which affect energy efficiency [2]. Data collected from small WWTPs (influent flowrate < 300 m 3 /d) pointed out an average specific energy consumption of ~0.91 kWh/m 3 , while medium-large WWTPs (influent flowrate > 5000 m 3 /d) exhibited an energy consumption in the range of 0.33-0.41 kWh/m 3 [2,25]. In the work of Awe et al…”

Section: Physical-related Factors: Plant Size and Age And Climate Con...mentioning

confidence: 87%

“…Recent studies have aimed to develop several methodologies to perform energy audits at WWTPs and consequently to develop energy benchmarking [25]. Specifically, benchmarking tools are useful to identify the opportunities for energy savings and to prioritize optimization with targeting measures.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review on Methodologies for the Energy Benchmarking of Wastewater Treatment Plants

Gallo,

Malluta,

Del Borghi

et al. 2024

Sustainability

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The main priority at wastewater treatment plants (WWTPs) is the attainment of a high quality of treated effluent ensuring the highly effective removal of pollutants and protecting the environment and public health. However, WWTPs are made of energy-intensive processes and consequently, they are considered major energy consumers in the public sector. The need to move towards energy neutrality in the wastewater sector was recently pointed out by the proposal of a recast Urban Wastewater Treatment Directive. To date, a comprehensive methodology for energy audits at WWTPs is still missing. The present review aims at discussing the state of the art on energy consumption at WWTPs and at surveying the energy benchmarking methodologies currently available highlighting the main advantages and limitations. It was pointed out that aeration represents the highest energy-intensive compartment in WWTPs (40–75% of total energy). The wide overview provided by key performance indicators (KPIs) might be overcome by applying benchmarking methodologies based on data envelopment analysis (DEA). The latest is properly designed for WWTPs and able to manage multiple inputs and outputs. However, the obtained findings are often limited and fragmented, making the standardization of the methodology difficult. Consequently, future investigations are advised on the development of standard procedures related to data acquisition and collection and on the implementation of online and real-time monitoring. Considering the lack of standardized methodology for the energy benchmarking of WWTPs, the present article will provide essential information to guide future research, helping WWTP utilities to reach the energy audit goals in the accomplishment of incoming EU directives.

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“…Compared to the relatively new AGS technology, CAS processes have been widely studied regarding energy usage, biogas production, and environmental impacts (Foladori et al, 2015; Hao et al, 2018; Llácer‐Iglesias et al, 2021; Silva & Rosa, 2022; Yang et al, 2010). For example, aeration efficiency has been extensively studied for CAS systems (Baquero‐Rodríguez et al, 2018) but scarcely for AGS processes (Strubbe et al, 2023). Similarly, the biogas production process from activated sludge has been broadly studied regarding methods and improvements (Uthirakrishnan et al, 2022), but the studies of waste AGS biogas potential are few (Bernat et al, 2017; Cydzik‐Kwiatkowska et al, 2022; Guo et al, 2020; Jahn et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Case study of aerobic granular sludge and activated sludge—Energy usage, footprint, and nutrient removal

Ekholm

Blois²,

Persson

et al. 2023

Water Environment Research

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This study demonstrates a comparison of energy usage, land footprint and volumetric requirements of municipal wastewater treatment with aerobic granular sludge (AGS) and conventional activated sludge (CAS) at a full‐scale wastewater treatment plant characterized by large fluctuations in nutrient loadings and temperature. The concentration of organic matter in the influent to the AGS was increased by means of hydrolysis and bypassing the pre‐settler. Both treatment lines produced effluent concentrations below 5 mg BOD7 L‐1, 10 mg TN L‐1, and 1 mg TP L‐1, by enhanced biological nitrogen‐ and phosphorus removal. In this case study, the averages of volumetric energy usage over one year were 0.22 ± 0.08 and 0.26 ± 0.07 kWh m‐3 for the AGS and CAS, respectively. A larger difference was observed for the energy usage per reduced P.E., which was on average 0.19 ± 0.08 kWh P.E.‐1 for the AGS and 0.30 ± 0.08 kWh P.E.‐1 for the CAS. However, both processes had the potential for decreased energy usage. Over one year, both processes showed similar fluctuations in energy usage, related to variations in loading, temperature, and DO. The AGS had a lower specific area, 0.3 m2 m‐3 d‐1, compared to 0.6 m2 m‐3 d‐1 of the CAS, and also a lower specific volume, 1.3 m3 m‐3 d‐1 compared to 2.0 m3 m‐3 d‐1. This study confirms that AGS at full‐scale can be compact and still have comparable energy usage as CAS.

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Oxygen transfer efficiency in an aerobic granular sludge reactor: Dynamics and influencing factors of alpha

Cited by 12 publications

References 46 publications

Synergies from off-gas analysis and mass balances for wastewater treatment — Some personal reflections on our experiences

Synergies from off-gas analysis and mass balances for wastewater treatment — Some personal reflections on our experiences

A Critical Review on Methodologies for the Energy Benchmarking of Wastewater Treatment Plants

Case study of aerobic granular sludge and activated sludge—Energy usage, footprint, and nutrient removal

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