Evaluation of cake filtration biological reactors (CFBR) vs. membrane biological reactors (MBR) in a pilot scale plant

Özdemir, Burcu; Saatçı, A. M.; Yenigün, Orhan

doi:10.1016/j.desal.2011.12.024

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…Considering all runs, the bench scale SFD MBR effectively removed suspended solids and organic matter, producing a very good quality effluent. The average effluent quality observed during the four runs confirms previous studies on aerobic SFD MBR treating municipal wastewater [ 5 , 17 , 18 , 19 , 20 , 21 ]. In this study, it was remarkable that high flux ( Table 2 ) and low effluent turbidity ( Table 3 ) were stably obtained during long-term experiments.…”

Section: Resultssupporting

confidence: 86%

Role of Mesh Pore Size in Dynamic Membrane Bioreactors

Vergine

Salerno

Casale

et al. 2021

IJERPH

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Two identical bench-scale Self-Forming Dynamic Membrane BioReactors (SFD MBR) were set-up and operated for the treatment of real urban wastewater. The two bioreactors were equipped with meshes of different mesh pore size. Meshes having pore size values of 20 and 50 µm were tested under solid retention time (SRT) of 15 d, whereas meshes with 50 and 100 µm pore sizes were compared under SRT of 50 d. The results of long-term experiments showed very good overall performances by all systems at the steady state. High flux (in the range 61–71 L m−2 h−1) and very good effluent quality were obtained, with average suspended solids and chemical oxygen demanding values below 10 mg L−1 and 35 mg L−1, respectively. The mesh pore size did not have a major influence on the average cleaning frequency. However, the pore size affected the effluent quality in correspondence of two particular conditions: (i) immediately after mesh cleaning; and (ii) during operation under high suction pressures (mesh clogging not promptly removed through cleaning). Moreover, the mesh cleaning frequency was observed to be dependent on the SRT. In tests with 50 d SRT, the cleaning requirements were very low (one every five days), and this limited the influence of the mesh pore size on the effluent quality. In conclusion, in SFD MBR, the role of the mesh pore size on the effluent quality may be more or less relevant depending on the operating conditions that directly influence the Dynamic Membrane formation.

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Section: Resultssupporting

confidence: 86%

Role of Mesh Pore Size in Dynamic Membrane Bioreactors

Vergine

Salerno

Casale

et al. 2021

IJERPH

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“…Nevertheless, a very important parameter shared by the different fouling mechanisms is surely represented by the average size of the membrane pores, since it affects the balance between internal and external deposition. In this context, the cake layer deposition represents a further key factor affecting membrane fouling and the consequent permeate flux reduction [ 48 ]. The "biological membrane" constituted by the cake layer deposited on the membrane surface can positively operate as a pre-filter [ 49 , 50 ] or can negatively affect total membrane fouling [ 23 , 28 , 51 , 52 ].…”

Section: Introduction: General Overviewmentioning

confidence: 99%

A Brief Review on the Resistance-in-Series Model in Membrane Bioreactors (MBRs)

Bella

Trapani

2019

Membranes

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The cake layer deposited on the membrane modules of membrane bioreactors (MBRs), especially under a submerged configuration, represents a relevant and fundamental mechanism deeply influencing the development of membrane fouling. It negatively affects the total resistance to filtration, while exerting a positive effect as a “pre-filter” promoting the “dynamic membrane” that protects the physical membrane from internal fouling. These two opposite phenomena should be properly managed, where the submerged membranes are usually subjected to a periodical cake layer removal through ordinary (permeate backwashing and air scouring) and/or irregular cleaning actions (manual physical cleaning). In this context, the physical removal of the cake layer is needed to maintain the design filtration characteristics. Nevertheless, the proper evaluation of the effect of physical cleaning operations is still contradictory and under discussion, referring in particular to the correct evaluation of fouling mechanisms. The aim of the present work was to summarize the different aspects that influence the fouling investigations, based on simple models for the evaluation of the resistance to filtration due to the cake layer, through physical cleaning operations.

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“…In the generality of cases, the membrane fouling proceeds in two steps: the initial membrane fouling caused by pore blockage and/or pore constriction followed by the long-term fouling arising from the filter cake gradually accumulating on the membrane surface (Kim et al, 1993;Tracey and Davis, 1994;Madaeni and Fane, 1996;Huang and Morrissey, 1998;Blanpain-Avet et al, 1999;Altman et al, 1999;Lim and Bai, 2003;Purkait et al, 2004Purkait et al, , 2005Wang and Tarabara, 2008;Juang et al, 2010;Mohd Amin et al, 2010;Ozdemir et al, 2012). The initial pore blocking frequently causes the irreversible fouling of membranes, resulting in the decrease in the efficiency of membrane cleaning.…”

Section: Developments Of Consecutive Combined Modelmentioning

confidence: 99%

Developments of Blocking Filtration Model in Membrane Filtration

Iritani

Katagiri

2016

KONA

109

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Blocking filtration laws consist of four different filtration mechanisms: complete blocking, standard blocking, intermediate blocking, and cake filtration. Blocking filtration laws for describing both the pore blocking and cake formation have been extensively employed over the past several decades to evaluate the increase in filtration resistance with the progress of filtration in the field of classical particulate filtration. In recent years, blocking filtration laws become widely used also in membrane filtration such as microfiltration and ultrafiltration of colloids. This paper gives an overview of the developments of blocking filtration laws and equations under constant pressure and constant rate conditions reported for the filtrate flow of Newtonian and non-Newtonian fluids. The fouling index evaluating the degree of membrane fouling was examined on the basis of the blocking filtration equations. The blocking filtration laws were reexamined to extend the range of their application. Moreover, various combined models developed based on the blocking filtration laws were introduced for describing more rigorously the complicated filtration behaviors controlled by more than one mechanism which occurs successively or simultaneously.

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Evaluation of cake filtration biological reactors (CFBR) vs. membrane biological reactors (MBR) in a pilot scale plant

Cited by 10 publications

References 29 publications

Role of Mesh Pore Size in Dynamic Membrane Bioreactors

Role of Mesh Pore Size in Dynamic Membrane Bioreactors

A Brief Review on the Resistance-in-Series Model in Membrane Bioreactors (MBRs)

Developments of Blocking Filtration Model in Membrane Filtration

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