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MBR System FAQs & Solutions
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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