Membrane Aerated Biological Reactor pilot in Spanish Living Lab

A pilot system of the Israeli company Fluence has been tested and validated for a year in the Spanish Living Lab.

The heart of this treatment system is the MABR (Membrane Aerated Biological Reactor) technology, which is based on passive aeration, that is, the diffusion of oxygen through membranes using a low pressure aeration flow.

During the treatment process, the oxygen necessary for the microbial metabolism responsible for the aerobic purification of wastewater is constantly supplied to a biofilm that develops on the outer face of a membrane, while denitrification occurs in biomass in suspension that is generated in the aeration chamber itself.

The membrane is spirally wound, each layer being isolated from the next one by the so-called “spacers”. Thus, a very high useful contact surface is created with respect to the real volume occupied by the membrane, which reduces the need for surface compared to conventional prolonged aeration systems and allows the expansion of the capacity of wastewater treatment plants that have become obsolete.

As indicated, the MABR system pursues biological nitrification and denitrification simultaneously in the same space. The biofilm, in contact with the air at low pressure, nitrifies the residual water while the biomass in suspension causes its denitrification.

The system has an anaerobic tank that can be used to study the biological elimination of phosphorus. In that case, the sludge recirculation stream is mixed with the pretreated water in a stirred tank, from which the mixture is led to the MABR.

The ASPIRAL S1 team is part of the range of compact solutions developed by Fluence. This is a range of treatment systems installed in standardized 20 and 40 foot containers, requiring very little civil work.

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