Absolutely, MBBR media can be tailored for specific wastewater treatment requirements. These customizations can encompass the media's size, shape, surface area, and even the material composition to optimize biofilm growth for particular types of wastewater. Such customization allows the media to support the growth of specific microbial communities or to enhance the removal of certain pollutants, like nitrogen or phosphorous.

As for advancements in MBBR media design, there’s been significant innovation. New materials and manufacturing technologies have led to more efficient and durable media. For example, there are now media with increased surface area for biofilm growth without increasing the size of the media, thanks to intricate designs. Developments in material science have led to the production of media that can resist harsh chemical environments or improve microbial adhesion. Moreover, some modern media designs facilitate easier movement within the reactor, enhancing contact with wastewater and improving overall treatment efficiency.