Background and Advantages of MBBR process

Judging from years of operation and practice, although the activated sludge method is relatively mature, it also has many shortcomings and deficiencies, such as large aeration tanks, high floor space, high infrastructure costs, etc., and adaptability to changes in water quality and water volume. Low, the operation effect is easily affected by water quality and water volume changes. In view of the above factors, this sewage treatment method was gradually replaced by the later biofilm method. The biofilm method makes up for many shortcomings of the activated sludge method, such as its good stability, strong ability to bear the impact of organic load and hydraulic load, no sludge expansion, no backflow, the high removal rate of organic matter, and the volume of the reactor The advantages of small size and small footprint of the sewage treatment plant. However, the biofilm method also has its own unique defects, such as the easy clogging of the filter material in the biological filter, the need for periodic backwashing, the simultaneous fixing of the filler and the difficulty of replacing the aeration equipment under the filler, the carrier in the biological fluidized bed reactor Particles can only function in a fluidized state, and the process stability is poor... etc. Because of the shortcomings and deficiencies of the above two processes, moving-bed-biofilm-reactor (MBBR) came into being. The MBBR method was introduced in the late s and was quickly applied in Europe. It has absorbed the advantages of both the traditional activated sludge method and the biological contact oxidation method to become a new and efficient composite process treatment method. The core part is to directly add suspended fillers with a specific gravity close to water into the aeration tank as the active carrier of microorganisms, relying on the aeration in the aeration tank and the lifting effect of the water flow to be in a fluidized state. When the microorganisms are attached to the carrier, The floating carrier moves freely in the reactor with the swirling and overturning effect of the mixed liquid, so as to achieve the purpose of sewage treatment.

Longzhuo are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

The current sewage treatment methods mainly include the activated sludge method and biofilm method: activated sludge method from the United Kingdom in the early 20th century Since its inception, after decades of development and innovation, it has had a variety of operation methods, and at the same time, it has gradually become a more mature process recognized by everyone due to its excellent sewage treatment effect; the biofilm method is to use the organisms attached to the filler to affect the water body A process for purification has also been rapidly developed and improved in recent years.

In the past ten years of research, the MBBR method has been widely used as a mature process in papermaking wastewater, food industry wastewater, slaughter wastewater, oil refining wastewater, and other industrial wastewater. It can also treat urban domestic sewage and urban wastewater and industrial wastewater. Mixed sewage of wastewater. Many engineering examples show that the MBBR method has a good effect on sewage treatment. And MBBR process have following advantages:

(1) Packing characteristics

The fillers are mostly made of polyethylene, polypropylene, and modified materials, polyurethane foam, etc. The specific gravity is close to water, mainly cylindrical and spherical, easy to hang the film, no agglomeration, no clogging, and easy to remove the film.     

(2) Good denitrification ability

A good nutrient, anoxic, and the anaerobic environment is formed on the packing, and nitrification and denitrification reactions can occur in one reactor, which has a good effect on the removal of ammonia nitrogen.

(3) Good effect of removing organic matter

The sludge concentration in the reactor is relatively high, and the general sludge concentration is 5-10 times that of the ordinary activated sludge method, which can be as high as 30-40g/L. Improve the efficiency of organic treatment, and strong impact load resistance.

(4) Easy to maintain and manage

There is no need to set filler brackets in the aeration tank, which facilitates the maintenance of the filler and the aeration device at the bottom of the tank, while saving investment and floor space.

A moving bed bioreactor is a biological sewage treatment process. In many instances, wastewater is full of organic matter that can be difficult to filter out by physical or chemical means. Thus, one of the best methods of dealing with organic matter is treating it with a biological process. The basic idea behind biological water treatment processes is using micro-organisms to break down sewage.

The media that carries out decomposition can be implemented in a number of ways. One of the most common is the activated sludge process, a type of suspended growth system that utilizes a loose sludge solution that is aerated to aid in the metabolic breakdown.

Another method is a trickling filter, a fixed film system that sprays the sewage on top of a bed of stones that are covered in a biofilm.

Both activated sludge and trickling filters have their advantages and are effective processes, but they also have certain disadvantages.

However, a moving bed bioreactor (MBBR) is a biological process that utilizes aspects of each of these systems and the associated benefits without their disadvantages. This process uses a biofilm that is attached to a carrier like the trickling filter, but the carriers are suspended in the solution with aeration bubbles like the activated sludge process.

Below, we&#;ll describe the pros and cons of an moving bed bioreactor system (MBBR) in wastewater treatment.

Pros

1. Higher effective sludge retention time (SRT)

Sludge retention time is effectively the length of time that a particular unit of biological media is actively working within the bioreactor.

As a fixed film system, the SRT of MBBR is much longer than that of a suspended growth system where the bio media can be pulled from the reactor at the outlet. Such systems require a recirculation line for the sludge. In the moving bed bioreactor process, the plastic carriers are kept within the reactor by a mesh sieve at the outlet, so none of the biofilm is lost.

If you are looking for more details, kindly visit mbbr tank supplier.

2. Lower hydraulic retention time (HRT)

Hydraulic retention time refers to the amount of time the bioreactor needs to effectively treat the waste water influent. Thanks to the combination of the moving carriers with the highly concentrated biofilm, HRT is shorter for these moving bed bioreactor systems when compared to others, typically only needing a few hours at maximum based on organic load.

3. Responds to load fluctuations without operator intervention

Many other treatment methods, biological or otherwise, need to be diligently monitored for load fluctuations so that dosages may be adjusted accordingly. WIth MBBR, this is unnecessary for fluctuations that aren&#;t considerably large.

The biofilm is naturally able to self adjust slightly to accommodate for different volumes, concentrations, or contaminants.

4. Lower sludge production

One of the biggest issue when dealing with wastewater is the resulting sludge after certain processes. Biological systems are no different. However, because MBBR is a fixed film system, nothing is being added to the effluent so the produced sludge volume is smaller than in additive biological processes.

5. Less area required

Thanks to the large inner surface area of the plastic carriers and the high bacterial concentration of the biofilm, moving bed bioreactor units are more compact and occupy less land area than other biological treatment systems.

6. Resilient to toxic shock

In a similar vein to its response to load fluctuations, MBBR systems are also resilient against toxic shock, which is an issue with other biological treatments. Some contaminants in wastewater can kill the bacteria in the biological media, but MBBR biofilms can respond and recover from such toxins.

7. Process performance independent of the secondary clarifier

Activated sludge systems use recirculated sludge to increase their SRT. However, if there are issues in the separation that occurs in the clarifier, the return sludge can be of lower quality and affect the performance of the reactor.

This is not an issue in MBBR systems because there is no need for recirculation being that it is a fixed film system.

8. Improved settling characteristics

How well the reactor effluent settles in the clarifying tank can affect the quality of the treated water.

This can be an issue in certain other biological treatment systems, but MBBR systems and their combined fixed film and suspended media qualities ensure that the solids settle out well, with little to no turbidity in the supernatant and low water content in the sludge.

Cons

1. Manual bacterial monitoring required

Biological systems are more difficult to monitor than other treatments. You cannot simply put a sensor in the tank to consistently keep track of the bacteria in the bio media. Operators have to regularly take samples of the media and analyze them in a lab by hand to ensure that the bacteria are alive and healthy.

2. Skilled operator needed

In order to monitor the bio media, the operators need to be experts in biological water treatment. The physical operation of these systems are not particularly complex, but the biological processes that occur are complex and require some skilled staff to ensure they are working properly.

MBBR treatment systems combine some of the best qualities of the activated sludge process and trickling filters without their disadvantages, but it is not without a few of its own. But, in instances and applications, the benefits can outweigh the negatives.

Do you want to learn more about the pros and cons of the moving bed bioreactor technology and how this technology could apply to your wastewater treatment application?

Contact Genesis Water Technologies, Inc., your water & wastewater treatment specialist at 1-877-267- in the USA, reach out to our local offices and partners around the world or contact us at to speak with one of our knowledgeable representatives.

If you want to learn more, please visit our website drift eliminator types.