anaerobic mbr

The treatability of high-strength wastewater with conventional anaerobic wastewater treatment is limited by the concentrations of FOG (Fats, Oils and Greases), high salt concentrations and high levels of COD (Chemical Oxygen Demand) or solids. Increasingly high discharge fees and ever stricter legislation have been strong drivers in the development of anaerobic membrane bioreactors (MBRs). 

Pentair developed a cutting-edge technology that combines anaerobic digestion and membrane separation to generate biogas and a high quality of reusable water. 

Conventional anaerobic granular systems have many limitations. The formation and settlement of the sludge granules is hampered when the concentrations of FOGs, salt or COD become too high.

Pre- or post-treatment is often required to prevent the washout of granules and achieve stable bioreactor performance. Moreover, the COD removal efficiency of conventional anaerobic techniques is only 70-90 percent.

There is no need for granules or DAF in an anaerobic MBR. The absolute membrane barrier retains the biomass in the system, where it will start to flocculate and achieve higher mass transfer rates due to the larger surface areas. Longer retention times allow fats to be easily degraded into biogas. Pre-or post-treatment is often not required at all, and the COD removal efficiency of anaerobic MBRs is typically more than 99 percent. 

If you have any questions, please contact us.

Typical applications

  • Highly concentrated streams: COD 5,000 - 250,000 ppm 
  • Bioethanol production: Pot Ale, Spent Wash, Thin Stillage and Vinasses
  • Fats, Oil and Grease (FOG) in waste streams from dairy, ice cream, candy, and biodiesel production
  • Starch slurries

Benefits

  • Smaller footprint compared to conventional techniques with pre- and post-treatment
  • Lower energy consumption compared to wastewaters which require aerobic post-treatment 
  • More biogas from the same amount of COD 
  • Permeate can be suitable for direct reuse due to the 99,99% removal of viruses and bacteria, or can be fed directly to reverse osmosis systems
  • 100% TSS (Total Suspended Solids) removal
  • Less discharge
  • Easier to operate (less personell required)