I. Overview of MBBR Process

The moving bed biofilm reactor (MBBR) was first proposed by Linde AG, Germany. Its principle is to put specific suspended fillers into ordinary activated sludge tanks to increase the volumetric load rate of sewage treatment, optimize effluent indicators, and enhance the system’s tolerance to high salinity and toxic and harmful compounds. MBBR integrates the advantages of traditional activated sludge method and biological contact oxidation method, so that the biodegradation advantages of solid phase biofilm and liquid phase activated sludge can be fully utilized to achieve the effect of complementary advantages. It effectively solves the problems of insufficient biomass in traditional activated sludge method and low mass transfer and mixing efficiency in contact oxidation process, and greatly improves the efficiency of biochemical reaction.

II. Characteristics of MBBR Process

(I) Structure and Ease of Modification

The MBBR process is easy to operate. It only needs to add an appropriate amount of fillers in the aeration tank to transform the activated sludge tank or anaerobic tank into MBBR. Its modification cost is relatively low, and the filler dosage is 10-70% calculated based on the effective volume.

(II) High efficiency and energy saving

The volume load of this process can be increased by 2-4 times, and the floor space is significantly reduced. At the same time, its energy consumption is low, the head loss is small, and the energy consumption is only slightly increased compared with the activated sludge method.

(III) Strong stability

The MBBR process has a high tolerance to temperature changes and toxic substances. When the temperature fluctuates, the sewage composition changes or the toxicity increases, the degree of its impact is much lower than that of the traditional activated sludge method.

III. Application scope of MBBR process

(I) Upgrading and transformation of sewage treatment plants

It helps sewage treatment plants to improve treatment standards and meet more stringent environmental protection requirements.

(II) Treatment of excessive ammonia nitrogen

It can effectively solve the problem of excessive ammonia nitrogen content in sewage and improve water quality.

(III) Expansion of sewage treatment plants

The treatment scale of sewage treatment plants can be increased on the original basis to adapt to the growing demand for sewage volume.

(IV) Pretreatment of high-concentration refractory organic matter

It is suitable for aerobic pretreatment of high-concentration and refractory organic matter, laying a good foundation for subsequent treatment.

4. Comparison of three types of MBBR processes

(I) Linpor MBBR process

This process mainly uses polyurethane sponge as a carrier and is widely used in the transformation of municipal sewage systems.

(II) Kaldnes MBBR process

Its biological carrier is mostly made of polyethylene material and has a ball ring structure.

(III) Levapor MBBR process

Developed by Bayer in Germany, by treating the surface of the Linpor carrier and adsorbing 30% activated carbon powder, its specific surface area is as high as 20,000m²/m³, which is 10-20 times that of the previous two. This process is particularly suitable for the treatment of high-concentration difficult-to-degrade organic matter, high ammonia nitrogen and nitrates. It has achieved remarkable results in the treatment of high-concentration, difficult-to-degrade, high-ammonia nitrogen organic wastewater in the chemical, pharmaceutical, pesticide and other fields, with more than 40 successful cases.

5. Performance comparison of three MBBR carriers

(The differences between the three carriers in terms of specific surface area, porosity, biological adhesion, and impact resistance can be elaborated here, but the specific comparison content is omitted for the time being because no specific comparison content is provided)

6. Advantages of Levapor MBBR technology application

In the field of municipal sewage, Levapor MBBR technology can increase the sewage treatment capacity by 2-4 times. When used in anaerobic systems for chemical, pharmaceutical and other wastewater treatment, it can enhance the tolerance to shock loads and toxic substances, and the detoxification efficiency is more than 2 times that of the original treatment system. When used in aerobic treatment systems, it can increase the volumetric load by 2-3 times and the nitrification function by 2-4 times, significantly enhancing the nitrification function and COD removal capacity of the system.

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