Five Misunderstandings when Using MBR Flat Sheet Membrane

Although many manufacturers now use MBR flat film for plant construction in the process of building factories, many business owners still have many misunderstandings about the use of this film. And the misunderstandings are as follows.

1. The use of MBR flat sheet membrane can ensure the quality of the effluent

Positive solution: MBR flat sheet membrane is essentially a combination of activated sludge method and membrane filtration according to mbr working principle. It is based on the traditional activated sludge method and uses membrane filtration instead of secondary sedimentation tank, which has the advantages of good interception and high sludge concentration, but it does not mean that MBR flat sheet membrane can cure all diseases.

For the removal of pollutants, the removal effect of membrane filtration on SS is very significant, while the removal of organic matter still relies on the biodegradability of activated sludge and organic matter.

For wastewater with poor biodegradability or wastewater with a large amount of biochemical treatment in the early stage, the treatment effect of MBR membrane is limited.

2. The higher the flux planning of the MBR flat sheet membrane and the better

Positive wastewater treatment solutions: Flat sheet membrane flux is determined by membrane data and structure. There is an upper limit to the porosity and flux of a particular membrane treatment device, and filtration is inherently a physical process.

While reducing the pore size, the membrane data is devoted to flux. At the same time, the flat sheet membrane also has to coordinate forces to ensure long-term operation, which leads to a constant flow.

Therefore, in the process of planning and use, it should be planned according to the parameters advocated by the membrane manufacturer.

3. The MBR flat sheet membrane does not need to discharge mud

Positive solution: Due to the good retention effect of membrane filtration, the activated sludge in the MBR membrane process can reach a higher concentration, and the separation of HRT and sludge age is completed, so the effect of sludge concentration on the effluent can be ignored.

However, this advantage only improves the play space of biochemistry, does not affect the effluent, and cannot be used as the reason why the flat sheet membrane does not discharge sludge. The problem of not being able to discharge sludge also needs to return to activated sludge.

If the sludge is not discharged, the activated sludge will have aging problems, affect the biochemical function, and affect the aeration. The membrane bioreactor (MBR) process can greatly reduce sludge discharge, but it is not without sludge discharge.

4. Minimize the sludge concentration to avoid clogging the flat sheet membrane

Positive solution: Membrane clogging is a common problem in the use of MBR membranes, and membrane clogging is sludge, especially when the sludge concentration is too high, there is a misunderstanding of reducing the sludge concentration to prevent membrane clogging, which happens to fall into another misunderstanding sush as using the water disinfectant powder.

Both low and high concentrations of sludge clog the membrane very quickly. The correct way is to keep the concentration on the proper scale. In addition, aeration has a scouring effect on the membrane surface and should also be maintained at a corresponding amount.

5. The flat sheet membrane should be responsible for discharge

Positive solution: The principle of the flat sheet membrane itself is filtration, which is a physical process. The removal of pollutants is mainly SS.

The significance of the flat sheet membrane bioreactor (MBR) membrane is to improve the biochemical function, but it cannot filter soluble organic matter, and the flat sheet membrane cannot be used as an indicator of COD. The removal of organic matter still depends on the planning and operation of the entire process chain.