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        MBR System FAQs & Solutions

        2022-08-19

        Membrane bioreactor is a water treatment technology which combines Membrane Technology and biochemical reaction in sewage treatment. Membrane bioreactor (MBR) filters the sewage in biochemical reaction tank with membrane and separates sludge and water. On one hand, membrane intercepts the microorganisms in the reaction tank, which greatly increases the concentration of activated sludge in the tank to a high level, so that the biochemical reaction of wastewater degradation runs more rapidly and thoroughly. On the other hand, the water production is clean and clear due to high filtration precision of membrane.

        In order to facilitate the operation and maintenance of MBR, solve problems in the process of operation timely, the common problems and solutions are summarized as bellow:

        FAQ

        Reason

        Solution

        Rapid decrease of flux

        Rapid increase of trans Membrane Pressure

        Substandard influent quality

        Pretreat and remove oil & grease, organicsolvent, polymeric flocculant, epoxy resins coating, dissolved matter of ion exchange resin, etc. in feeding water

        Abnormal aeration system

        Set reasonable aeration intensity and uniform air distribution (horizontal installation of membrane frame)

        Excessive concentration of activated sludge

        Check concentration of activated sludge and adjust it to normal level via technical control

        Excessive membrane flux

        Lower suction rate, decide reasonable flux by test

        Output water quality deteriorates

        Turbidity rises

        Scratched by large particles in raw water

        Add 2mm fine screen before membrane system

        Damage when cleaning or scratched by small particles

        Repair or replace membrane element

        Connector leakage

        Repair leaking point of membrane element connector

        Membrane service life expiration

        Replace membrane element

        Aeration pipe is blocked

        Uneven aeration

        Unreasonable design of aeration pipeline

        Downward holes of aeration pipe, pore size 3-4mm

        Aeration pipeline is unused for long, sludge flows into aeration pipeline and block the pores

        During system shutdown period, periodically start it for a while to keep the pipeline unblocked

        Blower failure

        Set check valve on pipeline to prevent sewage backflow to blower

        Membrane frame is not horizontally installed

        Membrane frame should be installed horizontally and keep aeration holes on same liquid level

        Water production capacity does not reach the designed value

        Low flux when start up new system

        Improper pump selection, improper membrane pore selection, small membrane area, mismatching of pipeline, etc.

        Membrane service life expiration or fouling

        Replace or clean membrane modules

        Low water temperature

        Raise water temperature or add membrane element

        ?

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