Wastewater Treatment

Wastewater Treatment

Ranging from biological treatment to membrane technologies, our solutions are trusted by customers worldwide to effectively treat different types of wastewater.


Conventional Activated Sludge system (CAS)

A CAS system is a series of biological treatment steps that degrade the biological materials from the sewage or wastewater.

The first step of a CAS system is the aeration tank, where the wastewater is mixed with air to activate micro-organisms. While digesting the wastewater, the organisms collide with each other, forming larger particles called flocs, which have a larger capacity to degrade the biological components of the wastewater.

The aeration basin is followed by a secondary clarifier or settling tank. During this step, micro-organisms with their adsorbed organic material settle.

Water from the clarifier is transported to installations for disinfection and final discharge or to other tertiary treatment units for further purification.

The surplus micro-organisms can easily be channelled to any of our sludge treatment solutions where energy can be recovered from the biosolids. This additional step closes the energy cycle of the wastewater treatment plant allowing it to run independently of fossil fuel.

Another part of the micro-organisms is fed back into the aeration tank in order to keep the load of micro-organisms at a sufficient level for the biological degrading processes to continue.

UNITANK® - Aerobic & Anaerobic Treatment

UNITANK®Keppel Seghers' UNITANK® is a space and cost saving biological wastewater treatment solution. UNITANK® is a Cyclical Activated Sludge System that combines the advantages of the Conventional Activated Sludge (CAS) system with those of a Sequencing Batch Reactor (SBR). The cyclical operation allows continuous influent feed and effluent discharge.


For more information, download our brochure.

UNIBRANE® - Membrane bioreactor wastewater treatment

UNIBRANE®Membrane Bioreactor (MBR) technology is a compact wastewater treatment step that combines biological degradation and membrane filtration. MBR is often used to achieve high quality effluent that can be re-used for household and industrial use.

The Keppel Seghers UNIBRANE® MBR technology is based on the perfect combination of specially developed UF-membrane modules with the established UNITANK® activated sludge process. The membrane can be either submerged in the biomass or mounted externally, enabling an advanced biological degradation and/or phosphorus removal.

UNIBRANE® is capable of treating highly polluted industrial wastewater and leachate for safe discharge according to stringent standards. It can be installed in a compact, modular and custom-built plant and is also ideal for treatment facility upgrades. With the addition of a Reverse Osmosis option, the treated water can be recycled for industrial and potable use.


For more information, download our brochure.