In biological wastewater treatment, microorganisms feed on organics to stabilize them, and reduce BOD and suspended solids in the wastewater.

Jet aeration systems add air to water, increasing dissolved oxygen content and supplying micro-organisms with oxygen during wastewater treatment.

Membrane Bioreactor (MBR) wastewater treatment systems by Siemens Water Technologies.

Packaged Wastewater Treatment Plants are available for biological treatment processes. Packated wastewater treatment plants can be pre-engineered and installed for small flows and field erected for larger flows.

Sequencing batch reactors treat wastewater such as sewage or the output from anaerobic digesters or mechanical biological treatment facilities in a tank batch process.

Wastewater mechanical aeration treatment systems from Siemens include the Orbal® and vertical loop reactors systems and more.