What is the difference between MBR and MBBR

What is the difference between MBR and MBBR

Distinguish by definition:

MBR is a membrane bioreactor

MBBR is carrier flow bed biofilm technology

Distinguish in principle:

MBR is activated sludge process + membrane separation

MBBR is a biofilm method

Membrane bioreactor (MBR):

Membrane bioreactors are a new type of water treatment technology that combines an MBR membrane with a biological treatment unit. The membrane module replaces the secondary sedimentation tank (or decanter), maintains a higher activated sludge concentration in the bioreactor, reduces the footprint of the sewage treatment facility, and reduces the amount of sludge by maintaining a low sludge load.

Moving Bed Biofilm Reactor (MBBR):

Carrier fluidized bed biofilm technology increases the biomass and biological species in the reactor by adding a certain amount of suspended carrier, thereby improving its treatment efficiency.

Different biological species are inside and outside each carrier, and some anaerobic or facultative bacteria grow inside. Microorganisms grow in gas, liquid, and solid environments. The collision and shearing of the carrier in the water make the air bubbles smaller and increase the oxygen utilization rate.

The outside is good for cultivating bacteria. In this way, each carrier is a micro-reactor, allowing the nitrification reaction and denitrification reaction to exist simultaneously, thus Improving the processing effect.

The core of MBBR is to add fillers and use fillers to increase the effective surface area of the reactor. The filler provides space for microorganisms to attach, grow, and form a biofilm, which can significantly improve the removal efficiency of organic matter, nitrogen, and phosphorus.

The design and materials of the filler will also affect the growth and reaction of microorganisms, thus determining the processing performance of the entire system.

The S-shaped MBBR filler patented by Xiaobobo floats with the water flow in the reaction tank under the disturbance of blast aeration, driving the attached and growing biological flora to fully contact the pollutants and oxygen in the water body. The pollutants are absorbed and diffused through adsorption and diffusion.

Enters the biofilm and is degraded by microorganisms. The attached growth of microorganisms can reach a very high biomass. The concentration of microorganisms is 2-4 times that of the suspended growth-activated sludge process, reaching 8-12g/L, and the degradation efficiency doubles.

Comparison of process effects

Removal of TN and TP

The MBBR process has a better effect on TN removal, while TP removal requires chemical phosphorus removal.

The removal of TN by the MBR process requires the removal of front-end biological methods. The MBR membrane itself has no removal effect on TN. The removal of TP also requires the removal of front-end chemical phosphorus.

Removal of SS

MBBR has no effect on removing SS. The back-end ultrafiltration membrane process needs to be used to remove SS. The MBR membrane can better remove SS.

Cost processing comparison

MBR membrane modules are expensive, generally have a service life of 4-5 years, and must be replaced regularly. The investment cost and operating cost are both high. In addition, the energy consumption of the MBR system is also high, mainly because membrane filtration requires a certain pressure drive.

In comparison, MBBR needs to add filler in the early stage of construction, and the investment cost is relatively high, but the subsequent operating costs are low. The filler has a long service life, does not require frequent replacement, and has relatively low energy consumption.

At the same time, the process is highly flexible and can be easily combined with the original activated sludge treatment process to form an activated sludge-biofilm integrated process or a fluidized bed-activated sludge combined process, which is ideal for the transformation of existing sewage treatment plants. And upgrades have greater advantages.

The advent of the S-type diaphragm

With the continuous improvement of sewage treatment requirements and the development of MBBR technology, the demand for high-performance biological fillers is increasing.

S-type biofilters with an effective specific surface area of up to 5000㎡/m³ have been introduced to meet market demand and improve sewage treatment efficiency. This shape greatly increases the biological attachment area, provides more space for the growth of microorganisms, and accelerates the growth of organic matter. Biochemical reaction processes such as degradation and nitrogen cycle.

At the same time, the S-shaped structure also has good fluidization performance, which allows the filler to flow fully in the reactor and does not easily adhere to the wall and accumulate, which improves the mass transfer efficiency.

It is widely used in various sewage treatment projects, especially in municipal and industrial applications. It has demonstrated excellent performance and stability in wastewater treatment, rural sewage treatment, circulating aquaculture tailwater treatment, livestock and poultry breeding wastewater treatment, and other fields.