Treating Wet Weather Flows in a Membrane Bioreactor: Changes in Mixed Liquor Properties cannot be Neglected

Trussell, R. Rhodes; Merlo, Rion; Cheng, Stephanie; Jolis, Domènec; Sukapanpotharam, Pardi; Bucher, Bob; Hermanowicz, Slawomir W.; Jenkins, David

doi:10.2175/193864706783750079

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…We may conclude that distinct changes in hydraulic loading have a potential to impact activated sludge filterability. Our findings are in accordance with Trussell et al [36] and Trussell [37] who found that deflocculation of sludge during rain weather flows caused an increase in colloidal content in the mixed liquor, resulting in severe membrane fouling. The change in the hydraulic loading rate resulted in operational problems that will be discussed as well in the below section.…”

Section: Hydraulic Loading Rate Effectsupporting

confidence: 93%

Impact of inflow conditions on activated sludge filterability and membrane bioreactor (MBR) operational performance

Krzemiński

Graaf²,

Lier

2015

Desalination and Water Treatment

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Section: Hydraulic Loading Rate Effectsupporting

confidence: 93%

Impact of inflow conditions on activated sludge filterability and membrane bioreactor (MBR) operational performance

Krzemiński

Graaf²,

Lier

2015

Desalination and Water Treatment

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“…The second aspect for the choice of four ES-100 units is related to operation and maintenance. Operation may include a relax-mode; 9-min "on", 1-min "off" cycles (Trussell et al, 2006), cleaning-in-place or complete removal of one ES-100 unit for maintenance. This would increase the flux to a value of 20.8 LMH for a limited period of time.…”

Section: Basis For Specifying Four Es-100 Microfiltration Units In Thmentioning

confidence: 99%

Model-based design of a pilot circulating bed membrane bioreactor for sewage treatment

Ismail

2017

EREM

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Population growth in developing countries leads to overloading existing sewage treatment plants. Additionally, suburban residential complexes are sometimes constructed and inhabited before their sewage treatment facilities are ready for various reasons. Therefore, there is a need for locally developed package units, which should be robust, modular, and require minimum maintenance. The following article describes the conceptual design of a hybrid bioreactor of such a unit intended to treat 120 m 3 of sewage per day. The design makes use of published literature in this regard over the last three decades. The proposed bioreactor consists of an upstream circulating bed compartment (CBC) with plastic biofilm carriers and a downstream microfiltration membrane compartment (MMC). Each of these two compartments has a nominal effective volume of 29 m 3 . The CBC is mainly anoxic whilst the MMC is aerobic (oxic) making the reactor an A/O arrangement. Following implementation, an initial experimental phase is envisaged to tune the reactor with respect to functionality and maximisation of nitrogen removal. Details of this tuning phase are also given in the article.

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“…Trusell et al (2006) have reported changes in the SMPs concentrations and particle sizes induced by water quality changes during wet-weather events.…”

Section: Model Developmentmentioning

confidence: 99%

“…Recently, Trusell et al (2006) reported changes in SMPs and floc sizes of the MLSS induced by wet weather flows. They report changes in two different pilot studies one with hollow fiber membranes and another with flat sheet membranes.…”

mentioning

confidence: 99%

Membrane Fouling in Submerged Membrane Bioreactors During Peak Wet Weather Flow. Modeling for Design and Operation

Giraldo¹,

LeChevallier²

2008

proc water environ fed

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A mathematical model that describes the dynamic behavior of submerged membrane fouling was incorporated into a hydraulic model of an MBR. It incorporates internal fouling of the membrane due to pore blocking and reduction, and fouling due to cake formation. The model allows the evaluation of operational strategies of the membrane as a result of a given input hydrograph to the plant. It produces the evolution of transmembrane pressure TMP as a function of time as the hydrograph transits through the plant. Changes in concentration of MLSS in each of the reactors as a result of the operation are presented. Three operational strategies are evaluated. The effect of having a VFD in the return flow of the membrane tank, and the tradeoff between more membrane filtration capacity or having an EQ tank at the head of the plant are discussed. The presence of the VFD is beneficial because it limits the concentration of MLSS in the membrane tank and reduces cake associated TMP. It is observed that the duration of the peak flux required from the membrane is critical in the overall behavior of the system. A lower peak flux of greater duration can be a more challenging condition to the membrane system than a higher peak flux of short duration. When selecting a design storm for membrane sizing is important to specify not only the return frequency but also the duration. No attempt was done to incorporate changes in filterability of the sludge due to changes of the chemistry of the water matrix during the storm. These effects can be added in the future; however, it is expected that their effect further emphasize the conclusions reached here.

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Treating Wet Weather Flows in a Membrane Bioreactor: Changes in Mixed Liquor Properties cannot be Neglected

Cited by 5 publications

References 11 publications

Impact of inflow conditions on activated sludge filterability and membrane bioreactor (MBR) operational performance

Impact of inflow conditions on activated sludge filterability and membrane bioreactor (MBR) operational performance

Model-based design of a pilot circulating bed membrane bioreactor for sewage treatment

Membrane Fouling in Submerged Membrane Bioreactors During Peak Wet Weather Flow. Modeling for Design and Operation

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