An aeration energy model for an immersed membrane bioreactor

Verrecht, Bart; Judd, Simon; Guglielmi, Giuseppe; Brepols, Christoph; Mulder, Jan-Willem

doi:10.1016/j.watres.2008.09.013

Cited by 120 publications

(58 citation statements)

References 16 publications

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“…In fact, aeration is used both to provide oxygen for maintaining activated sludge in suspension and to reduce fouling by scouring on the membrane surface [3]. A balance between flux, TMP, energy demand and cleaning frequency is crucial [4,5]. To date, many researchers have been working on membrane fouling in order to identify which factors affect this phenomenon and how to reduce the operating costs [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The fouling phenomenon in membrane bioreactors: Assessment of different strategies for energy saving

Mannina

Cosenza

2013

Journal of Membrane Science

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a b s t r a c tMembrane fouling represents one of the major issues for a membrane bioreactor (MBR). Membrane fouling and high aeration requirements (for inducing shear stress to limit fouling) make MBR operation economically demanding due to high energy costs. Although several studies on MBR fouling have been performed, comprehensive knowledge on how to reduce membrane fouling and consequently save energy is still lacking.An integrated mathematical model for MBR is applied to a University of Cape Town membrane bioreactor with the final aim to reduce the energy costs. In particular, the influence of the aeration intensity, the duration of filtration/backwashing cycles, and the number of membrane cleanings are investigated. Five scenarios are analyzed and compared, each implementing different operating conditions. The features of the analyzed scenarios are quantified by employing Monte Carlo simulations and performance indices partially drawn from literature. The results provide insights about the role played by the main physical/chemical/biological processes in view of a system optimization. As expected, MBR operation at low air flow rate (qa) leads to a substantial reduction of the operational costs (specifically, 20% with respect to the suggested manufacturers ones in terms of qa). Despite such a reduction of qa, a good effluent quality is also obtained as an effect of a high biological cake thickness. Results also show that the values of filtration time (Tf) higher than those suggested by manufacturers (e.g., Tf ¼ 9 min) can be used to increase effluent quality. This study demonstrates that both energy savings and effluent quality can be improved by varying the operational variables with respect to those of the suggested manufacture. One of the main insights gained from this study is that the values of the operating variables (i.e., qa, Tb and Tf) suggested by the manufactures can be changed to obtain a system that still respects high effluent quality and is characterized by lower economical cost. The proposed modeling approach can be an useful tool for the optimization of the operating conditions in order to reduce the operational costs for MBR systems.

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Section: Introductionmentioning

confidence: 99%

The fouling phenomenon in membrane bioreactors: Assessment of different strategies for energy saving

Mannina

Cosenza

2013

Journal of Membrane Science

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“…The synthetic wastewater was composed of carbon (750 mg/L COD as glucose), nitrogen (37.5 mgN/L as NH 4 Performance test of activated sludge AOB was evaluated based on NH 3 -N removal measured (C-MAC Co., Ltd., South Korea) after filtering the mixed liquor with 0.45 lm syringe filter (Whatman Ò ).…”

Section: Mbr Operation and Performance Test Of Activated Sludge Aobmentioning

confidence: 99%

“…This most likely explains why a number of comprehensive studies dealing with aeration have been conducted in the past few years to reduce energy demand in MBR [4][5][6]. There are also studies which focused on both reducing energy demand and innovating biological treatment processes by operating MBR under low dissolved oxygen (DO) condition [7,8].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the performance of activated sludge ammonia oxidizing bacteria in a lab-scale alternating hypoxic/oxic membrane bioreactor

Sibag

Kim

2014

Chemical Engineering Journal

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“…The energy consumption of secondary treatment unit was more than 50% compared with that of the total wastewater treatment plant (WWTP) [1][2][3], the research on the choose of aeration devices has been widely attracted attention [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…In one WWTP using typical A 2 /O process, the energy consumption distributions of various units and equipment in the entire wastewater treatment process were analyzed [5]. The methods and solutions of energy saving potential could be put forward, and the importance of the optimal aeration system was also presented.…”

Section: Introductionmentioning

confidence: 99%

Comparative Research to Surface Aeration and Blasting Aeration System Based on LCC Theory

Liai

Hou²,

Weibiao³

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. It is difficult to select the suitable aeration system for the designers of wastewater treatment plant (WWTP). In this paper, taking two WWTPs with surface aeration systems and blasting aeration respectively for an example, LCC theory was adapted to analysis the cost of consumption and the environmental impact, which caused by the different aeration system. Research results showed that: (1) In the 20-year life cycle, the LCC mainly depended on the cost of energy consumption whatever blasting aeration system or surface aeration, while the LCC of blasting aeration system affected by the equipment maintenance cost, maintenance cost, economic losses caused by wastewater loss and environmental load in maintenance period.(2) The LCC of blasting aeration system was lower than the surface aeration in general, on the premise of the standard discharge; (3) the blasting aeration system estimated a saving of 60,0000RMB annually in costs compared with the surface aeration. IntroductionThe energy consumption of secondary treatment unit was more than 50% compared with that of the total wastewater treatment plant (WWTP) [1][2][3], the research on the choose of aeration devices has been widely attracted attention [4,5].In one WWTP using typical A 2 /O process, the energy consumption distributions of various units and equipment in the entire wastewater treatment process were analyzed [5]. The methods and solutions of energy saving potential could be put forward, and the importance of the optimal aeration system was also presented. By comparing surface aeration process and blasting aeration process in oxidation ditch WWTP, L G Shao [6] analyzed the treatment effect and energy consumption in 2010(one year) , and the results showed that: surface aeration system paid more cost than the blasting aeration system, that was about 1,300,000RMB one year in 10Wm 3 /d per day. Another typical example was illustrated by P yang [7], the same results coincided that surface aeration need cost more energy consumption than blasting aeration at the similar circumstance. In addition, Y Liang [8] carried on the research that the variation of energy consumption changed with influence of oxygenation capacity of fine bubble aerator. To reduce energy consumption of WWTP, B Kumar[9], A Thapinta [10], I Lee [11], M Jolly [12] and so on were respectively studied the oxygenation capacity of surface aeration or blasting aeration equipment.Based on the above analysis, much research had been devoted to the energy consumption of aeration equipment and obtained certain research results. However, the conclusions weren't considered

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An aeration energy model for an immersed membrane bioreactor

Cited by 120 publications

References 16 publications

The fouling phenomenon in membrane bioreactors: Assessment of different strategies for energy saving

The fouling phenomenon in membrane bioreactors: Assessment of different strategies for energy saving

Evaluating the performance of activated sludge ammonia oxidizing bacteria in a lab-scale alternating hypoxic/oxic membrane bioreactor

Comparative Research to Surface Aeration and Blasting Aeration System Based on LCC Theory

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