《Nature》 Publishes Article on a New Breakthrough in MBBR Technology: How a Novel “V-Shaped Carrier” Solves the Clogging Problem and Breathes New Life into the High-Density Media Market

Recently, a research team from the Ulsan National Institute of Science and Technology (UNIST) in South Korea published a new study in *Nature Communications* on the structural optimization of MBBR (Moving Bed Biofilm Reactor) carriers. The researchers proposed a V-shaped carrier design known as the “Hydro-topological Strategy,” which enables active control of the biofilm growth process by altering the internal fluid pathways within the carrier. For industry professionals who have long followed the development of MBBR bio-carrier technology, this study has garnered attention not merely because of the change in carrier shape, but because it attempts to solve a long-standing engineering challenge: clogging and reduced mass transfer efficiency caused by excessive biofilm thickening. In traditional MBBR systems, as operating time increases, microorganisms continuously attach to the carrier surface and form biofilms. After a period of use, these biofilms thicken. Indeed, although the total microbial biomass in the system increases—which, in theory, should improve overall efficiency—the actual diffusion efficiency of oxygen and pollutants into the biofilm actually decreases.

We encountered a similar issue in our food processing wastewater treatment project in Southeast Asia; after several years of operation, biofilm accumulation inside the carriers often became very noticeable. In many wastewater treatment facilities, MBBR carriers and microporous aerators often need to be flushed or replaced after several years of operation, which is a major undertaking. Interestingly, long-term biofilm management has become a more common topic in customer discussions than carrier surface area alone. According to the research team, the novel V-shaped structure alters the flow path of water within the carrier, creating varying levels of hydraulic shear stress across different zones. When biofilm overgrows, higher local shear stress promotes the detachment of aged biofilm; conversely, in areas where active biomass needs to be maintained, a relatively stable attachment environment is preserved. Researchers describe this mechanism as a biofilm control method with “self-regulating” characteristics. Based on experimental results, this design shows significant potential for maintaining biofilm stability and preventing internal clogging. However, it remains unclear whether it can maintain equivalent performance under conditions of drastic fluctuations in wastewater characteristics; further validation through practical projects is required for market acceptance.

From the perspective of our industry’s development, this research sends a noteworthy signal: the future competitive focus for MBBR carriers may be shifting from simply increasing specific surface area to placing greater emphasis on hydrodynamic design and biofilm management capabilities. Over the past decade, optimization efforts for most MBBR carrier products have focused on metrics such as effective surface area, biofilm formation rate, and material strength. However, this study suggests that actively controlling biofilm thickness through structural design may become a key direction for next-generation carrier R&D. For MBBR carrier manufacturers, this also implies that future system designs will place greater emphasis on the synergy between the carrier and the aeration system. However, one practical question remains unanswered: can such complex internal geometries be manufactured at scale in a cost-effective manner? We have observed that in recent years, an increasing number of customers from recirculating aquaculture systems (RAS), industrial wastewater upgrading projects, and high-load municipal wastewater treatment projects have begun to focus on operational stability at higher packing densities. As packing density continues to increase, the mass transfer and clogging challenges faced by traditional carriers become more pronounced. The value of the V-shaped carrier research lies not only in proposing a new structural design but also in providing a new technical approach for the future development of high-density MBBR systems.