Technical principle and characteristics of membrane-bioreactor
Time:
Oct 27,2023
In the membrane-bioreactor, because the membrane module is used to replace the secondary sedimentation tank in the traditional activated sludge process, the solid-liquid separation can be carried out, and the water quality of the effluent in the traditional activated sludge process is not stable enough, and the sludge is easy to expand., Which has the following advantages:
In the membrane-bioreactor, because the membrane module is used to replace the secondary sedimentation tank in the traditional activated sludge process, the solid-liquid separation can be carried out, and the water quality of the effluent in the traditional activated sludge process is not stable enough, and the sludge is easy to expand., Which has the following advantages:
(1) can carry out solid-liquid separation, the water quality is good and stable, can be directly used;
(2) Due to the interception of the membrane, the microorganisms can be completely trapped in the bioreactor, and the hydraulic retention time (HRT) and sludge age (SRT) of the reactor can be completely separated, making the operation control more flexible and stable;
(3) The bioreactor can maintain a high concentration of microbial biomass, the volume load of the treatment device is high, and the area is saved;
(4) It is beneficial to the interception and growth of microorganisms with slow proliferation such as nitrifying bacteria, and the nitrification efficiency of the system can be improved. It can also increase the hydraulic retention time of some refractory organic matter in the system, and effectively retain the microorganisms that decompose refractory organic matter in the reactor, which is conducive to the improvement of the degradation efficiency of refractory organic matter;
(5) Membrane-bioreactors generally operate under high volume load and low sludge load, with low residual sludge production and reduced sludge treatment costs;
(6) It is easy to realize automatic control and convenient operation and management.
However, membrane-bioreactor also has some shortcomings:(1) In the process of operation, the membrane is easy to be polluted, the water production is reduced, and it also brings inconvenience to the operation and management. This is the problem that the majority of researchers are committed to improving;(2) The manufacturing cost of the film is relatively high. However, with the continuous advancement of membrane manufacturing technology, its cost is expected to decrease.
Key words:
Technical principle and characteristics of membrane-bioreactor
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