Membrane Aerated Biofilm Reactor

What it is & How it Works?

• It is PDMS hollow fiber membrane with 0.3 mm diameter & 0.1mm wall membrane
• It is Gas permeable membrane
• Bacteria in the form of bio film grows on the outer surface of the hollow fiber tube (fixed film)
• Air at low pressure (not against water head) is blown the hollow fiber tube, saves power (op ex)
• O2 (oxygen) diffuses through the wall of membrane to the base of Bio film, which is surrounded by anoxic waste water
• Simultaneous nitrification & De-nitrification takes place in the same tank (saves Cap.Ex.) no need of large recirculation of nitrite to nitrate (Op.Ex. saved)
• Ammonia in water diffuses to the base of bio film, where it is nitrified to make Nitrite and Nitrate
• Both Nitrate & nitrite diffuse to surface of Bio film at outer layer, where they are combined with COD & BOD of water & De-nitrify.

Advantages

• MABR offer 95% oxygen transfer efficiency, whereas conventional systems offer around 30%
• No back wash needed as liquid does not pass through the membrane, only gas
• (Air & o2) pass through.
• Air passed through hollow fiber tube, not subjected to head pressure of water level,
• So low pressure @ 150 mBar

Application

Retro fit for existing STPs and ETPs, to augment capacity of treatment & enhance treated water quality with BNR, no civil work in existing plants, packaged plants for STPs, 100 / 200/ 300 KLD Modular units with BNR.