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Common questions of MBBR technology in engineering applications

Dec 23, 2024

1.How long does it take for the MBBR Bio Media filler to form a biofilm during low-temperature commissioning in winter?

 

Re:It can be achieved well in one month. It is a gradual process for the biofilm forming. We analyze the biofilm formation from two angles.

The first is that our eyes can see obvious biofilms on the MBBR Bio Media filler, which may take seven days,the second is the time to reach the standard, which is about one month in winter,the third is the time for the biofilm to fully mature, which will be longer, because from the professional perspective, the biofilm must experience at least a winter and summer alternation before the colonies on it can finally achieve stability.

In summary, although from an academic perspective, our stability is probably after a winter and summer, from the perspective of our effect, the effluent can meet the standard within 30 days, and from the perspective of naked eye recognition, it is about seven days.

 

  2.Does the MBBR process need to add biological agents?

 

Strictly speaking, MBBR does not need to add biological agents. It can naturally enrich, for example, our nitrifying bacteria or denitrifying bacteria through reasonable optimization parameters,its biofilm conditions are conducive to the attachment of related bacteria, such as ammonia-dissolving bacteria, which is also conducive to the attachment of ammonia-dissolving bacteria under specific conditions. Under special water quality conditions, such as some difficult-to-degrade water or water sources are relatively single, some specialized agents have special effects, so the addition of biological agents can be used as the initial inoculation, and no subsequent addition is required. In summary, it is not necessary to add biological agents under domestic sewage water, but it can be used as a research proposition to conduct relevant research under some specific wastewater conditions.

   3.Does MBBR need denitrification flushing?

 

The biggest advantage of MBBR is that it does not need back washing compared to traditional biofilms, because its biofilm will fall off automatically. From our research, we found that when your biofilm is more active, its extracellular polymer secretion will be more, and its viscosity will be stronger. Then when it ages, the extracellular secretion decreases, its viscosity weakens, and it will automatically fall off during the fluidization process, and then a new biofilm will grow up, so it does not need to be flushed.

 

    4.Can MBBR still operate when the water temperature is 3 degrees?

 

In Xinjiang District,China where the water temperature is around 7 to 8 degrees and can operate stably. The inlet water of the Nordheim sewage treatment plant in Norway (which serves the Winter Olympics) is ice and snow melt water, and the water temperature is 3 degrees. After practice, it can be stably met.

 

Differences between MBBR, MBR and FBR

 

MBBR

 

MBBR is a moving bed biofilm reactor, which uses free-floating plastic film media to allow microorganisms to attach and grow. The plastic film media needs to remain suspended, so the material density needs to be close to the density of water, and continuous aeration is required to allow good contact between pollutants and attached biofilms, thereby effectively removing BOD.

 

Characteristics of MBBR:

  1. Simple construction and easy operation.
  2. High organic matter removal efficiency, good nitrogen and phosphorus removal effects.
  3. Not easy to clog, no regular backwashing is required.
  4. A sedimentation process is required after the treatment.

 

MBR

MBR stands for membrane bioreactor, which is a process that combines separation membrane technology with activated sludge. Most membrane bioreactors are immersed in sewage and treat organic matter in sewage through microorganisms attached and grown on the membrane surface.

 

Characteristics of MBR:

  1. It can operate at high volumetric load and low sludge load, with low residual sludge production (theoretically, zero sludge discharge can be achieved), reducing sludge treatment costs.
  2. The reactor can maintain a high MLSS concentration, and the treatment device has a high volumetric load, thereby reducing the floor space.
  3. High microbial biomass requires sufficient aeration, so the operating energy consumption is also higher.
  4. It is easy to cause membrane fouling, and the membrane needs to be cleaned or backwashed regularly.

 

FBR

FBR fixed bed biofilm reactor, its working principle is similar to MBBR, the difference is that the biofilm is attached to a fixed solid material block. Aeration under the solid material block provides oxygen for the biofilm to grow and controls the cleaning of the membrane block.

 

Features of FBR:

  1. It can adapt to wastewater with large changes in influent water volume and organic matter content.
  2. It is more convenient to operate than MBBR and has lower energy consumption (because aeration is directly at the bottom).
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