Belgian wastewater plant meets nitrogen levels after MABR/MBR upgrade from GE

Flanders’ wastewater treatment company Aquafin has upgraded the Schilde Wastewater Treatment Plant bto meet new total nitrogen removal requirements...

Content Dam Ww Online Articles 2017 02 Flanders

Content Dam Ww Online Articles 2017 02 Flanders

FLANDERS, Belgium - Flanders’ wastewater treatment company Aquafin has upgraded the Schilde Wastewater Treatment Plant by partnering with GE Water & Process Technologies.

Needing to meet new total nitrogen removal requirements while remaining in its existing footprint, the plant adopted a combined solution of GE's ZeeLung Membrane Aerated Biofilm Reactor (MABR) and ZeeWeed membrane bioreactor (MBR) technologies.

The plant, located in the Belgian province of Antwerp, will be the first in Europe to use the new ZeeLung MABR technology.

The hybrid system will see 50% of the wastewater treated by ZeeWeed 500D MBR, and the remaining flow of 8,000 m3/day treated by a conventional activated sludge system.

Adding ZeeLung MABR to the plant will enable improved total nitrogen removal in the conventional activated sludge stream, according to GE.

The plant was originally designed for the treatment of 28,000 population equivalents (both hydraulic and biologic capacity).

The actual load of the Schilde Wastewater Treatment Plant has, however, gradually increased to 35,000 population equivalents.

Therefore, in 2015, biological treatment capacity was increased by extending membrane capacity of the MBR (so it can handle more flow) and installing post-denitrification sand filters on the effluent of the conventional activated sludge system.

ZeeLung MABR technology employs a gas transfer membrane to deliver oxygen to a biofilm that is attached to the membrane surface. Immersing ZeeLung cassettes into mixed liquor increases the inventory of biomass in a treatment system thereby intensifying the biological treatment process. Oxygen is delivered to the biofilm by diffusion through the membrane, which reduces the energy required for oxygen delivery by up to four times compared to conventional aeration.

The Schilde WastewaterTreatment Plant is the largest municipal hybrid MBR system in Flanders, and the upgrade is being completed by Kamps SA.

After the expansion is complete in the first quarter of 2017, the plant will have 65% total nitrogen removal

Alain Mineur, CEO of Kamps, said: “Using ZeeLung and ZeeWeed together for the expansion of the Schilde Wastewater Treatment Plant will allow Aquafin to complete the upgrade with minimal modifications and with no need to build new tankage. Additionally, they will be able to meet the new annual total nitrogen removal consent.”

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