Treating high-strength wastewater while producing energy
Anaerobic MBR was developed to treat high-strength (COD 5,000-250,000) and high-solids industrial wastewater streams. The unique combination of membrane filtration and anaerobic biological treatment results in significant advantages, including maximum COD (>99%) and TSS removal, lower disposal costs, methane-rich biogas and a smaller water footprint, as Anaerobic MBR allows the permeate to be reused.
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.
See the product description on Pentair’s website.