Overview
MBBR (Moving Bed Biofilm Reactor) is a highly efficient biological sewage treatment technology. It utilizes freely moving suspended media as carriers for microbial attachment. These media are typically made of corrosion - resistant materials such as high - density polyethylene (HDPE), which can cultivate biofilms and treat pollutants in water. But how exactly do these media work, and in which fields are they applicable? Today, let's seek the answers to these questions.
What's the Working Principles of MBBR Media?
(1) Microbial Attachment: The surface of MBBR media is mostly rough and porous. When sewage flows through, microorganisms such as bacteria and fungi can attach to the surface of these media, forming biofilms.
(2) Pollutant Degradation: After a biofilm forms on its surface, the microorganisms within can adsorb, oxidize, and decompose pollutants in the wastewater, such as organic matter (COD/BOD) and ammonia nitrogen (NH₃ - N).
(3) Simultaneous Nitrification and Denitrification: In the environment where the micro - aerobic and anaerobic zones coexist inside the media, nitrification (NH₃→NO₃⁻) and denitrification (NO₃⁻→N₂) can occur simultaneously to remove nitrogen from the sewage.
2. Dynamic Movement of Media
(1) Aeration - driven: During operation, the bottom aeration system of the treatment tank injects abundant bubbles into the sewage. This enables the biofilms on the MBBR media to come into full contact with the sewage.
(2) Anti - clogging Mechanism: The lightweight media can be suspended and move freely with the water by slightly shaking in the biochemical tank. Clogging rarely occurs.
(3) Biofilm Renewal: When the biofilm on the media reaches a sufficient thickness, it will sink to the bottom of the pool. The high impact force at the bottom of the aeration zone can quickly wash away the remaining biofilm on the media, allowing it to rise back to the aeration zone.
Main Applications of MBBR Media
MBBR media are commonly used in wastewater treatment, especially for the removal of organic matter (BOD/COD) and nitrogen compounds such as ammonia. They are mainly used in municipal sewage treatment, industries such as food and beverage, chemical engineering, and even smaller decentralized wastewater systems. The details are as follows:
Domestic sewage is the wastewater generated from people's daily life, mainly coming from kitchens, bathrooms, and laundries. It contains various organic substances, as well as nutrients such as nitrogen and phosphorus. The biofilm on the surface of MBBR media contains a variety of microorganisms, including bacteria, fungi, and protozoa. These microorganisms decompose the pollutants in domestic sewage through metabolism, reducing its chemical oxygen demand (COD). Eventually, the treated wastewater is discharged into local waterways and can be reused for irrigating crops and maintaining aquatic life.
The MBBR technology can remove nitrogen from wastewater. When in use, a suitable micro - environment is created in the reactor, including controlling conditions such as dissolved oxygen and pH value. Nitrifying bacteria and denitrifying bacteria can enrich and grow on the biofilm of MBBR media. The former oxidizes ammonia nitrogen to nitrite and then further to nitrate. The latter reduces nitrate to nitrogen gas under anoxic conditions and releases it into the atmosphere. Ultimately, the ammonia nitrogen content in the wastewater is effectively reduced.
These media are also suitable for treating wastewater from food processing, chemical manufacturing, pulp and paper mills. For example, food - processing wastewater contains a large amount of organic matter such as lactose, protein, and fat, with a very high COD concentration. The microorganisms on the MBBR media can quickly adapt to this high - concentration organic wastewater, decompose the organic matter in the water, meet the discharge standards, and be reused for greening and irrigation in the factory area.
In the field of aquaculture, the MBBR technology is mainly used to maintain water quality and prevent diseases. Otherwise, with the increase in aquaculture density, the wastewater in fish ponds may become eutrophic, causing fish diseases or death. MBBR media can be connected to the fish - pond water circulation system. Through aeration, the wastewater circulates in the reactor, which can increase the oxygen content in the water and decompose some of the ammonia nitrogen and nitrite in the water.
Optimize Your Water Treatment Project with MBBR Media
In this article, we have explored the working principles of MBBR media in water treatment and learned about their main water - treatment applications, including domestic sewage treatment, nitrification and denitrification, industrial wastewater treatment, and aquaculture.
AquaSust is a water - treatment supplier and manufacturer in China. We can provide various water - treatment equipment and accessories according to the needs of your water - treatment project. If you want to learn more relevant information or obtain customized MBBR media, click "here" to contact our experts.