Definition of primary treatment in English:

primary treatment


  • [mass noun] The sedimentation and removal of most suspended matter from sewage effluent.

    [as modifier] ‘a primary treatment plant’
    • ‘Most Canadian cities, especially those on the west coast, provide only primary treatment to sewage.’
    • ‘Five out of seven sewage treatment facilities in the Greater Vancouver Regional District provide primary treatment of sewage.’
    • ‘At the time many mills did not have primary treatment for mill effluents (for example, the use of a settling pond) and fewer still had secondary treatment ponds, which used aerobics to reduce drastically the pollution risk.’
    • ‘The sand bioreactors described in this bulletin are intended for domestic sewage following primary treatment.’
    • ‘The next stage is primary treatment, which consists of gravity settling to remove suspended solids.’