A treatment process for wastewater or sewage that follows primary treatment.

द्वितीयक उपचार

English Usage: The secondary treatment of the wastewater improved its quality significantly.

Hindi Usage: अपशिष्ट जल का द्वितीयक उपचार इसकी गुणवत्ता में महत्वपूर्ण सुधार करता है।

Referring to something that is not primary; of lesser importance.

द्वितीयक

English Usage: The secondary effects of the drug were not initially considered in the study.

Hindi Usage: दवा के द्वितीयक प्रभावों पर प्रारंभिक अध्ययन में विचार नहीं किया गया था।