Wastewater

Wastewater refers to all water that has been fouled by individuals and industries. In the case of combined drainage systems, rainwater is recovered by the same drains and mixed with wastewater. When a different drain collects rainwater, we talk of a separate drainage system. Some industrial plants have their own wastewater system and their own water treatment facility, with disposal into the natural environment or into a communal wasterwater drainage system.

Wastewater is piped through sewers to a treatment plant where it is treated and discharged into the environment or ultimately re-used. Treatment can be mechanical (screening, filtration, etc.), physicochemical (coagulation / flocculation, etc.), biological (returned activated sludge, biofiltration, etc.) or a combination of several of these processes.

As well as treating effluent, the wastewater treatment system must also manage the treatment of sludge and air.

The design of the overall wastewater treatment system will depend on the physico-chemical characteristics of the effluent and on requirements regarding the quality of the discharge water. It must be remembered that, in the case of combined systems, the effluent will be diluted when it rains, a situation which will impact the design of the treatment system.

FELJAS & MASSON (BRITTANY) subsidiary is specialized in the design and construction of such wastewater treatment stations, as well as in the rehabilitation of existing structures.

FELJAS & MASSON also designs and equips pumping and discharge stations of varying sizes and capacities that form part of sanitation networks.

Click here to read more about our past wastewater projects.