Definition of secondary treatment in English:

secondary treatment

noun

  • The further treatment of sewage effluent by biological methods following sedimentation.

    • ‘Do most sewerage treatment plants only use secondary treatment?’
    • ‘Most treatment plants also have secondary treatment, whereby sewage is stirred and oxygen is blown in to help beneficial bacteria breed and eat up the ‘solids.’’
    • ‘The next stage is secondary treatment, which is designed to remove soluble organics from the wastewater.’
    • ‘This waiver allows for less than full secondary treatment of the sewage being discharged into the ocean off Huntington Beach.’
    • ‘Ecosystem damage and fish toxicity occurred downstream from mills that did not use chlorine, even in advanced mills with secondary treatment processes.’