Primary Treatment

{
  "id": "MLC-T-ENV-022130",
  "term": "Primary Treatment",
  "field": "Environment",
  "definition": "1. First stage of wastewater treatment in which solids are removed by screening and settling.\n\n2. A basic wastewater treatment method that uses settling, skimming, and (usually) chlorination to remove solids, floating materials, and pathogens from wastewater. Primary treatment typically removes about 35 percent of biochemical oxygen demand (BOD) and less than half of the metals and toxic organic substances.\n\n3. The practice of removing some portion of the suspended solids and organic matter in a wastewater through sedimentation. Common usage of this term also includes preliminary treatment to remove wastewater constituents that may cause maintenance or operational problems in the system (i.e., grit removal, screening for rags and debris, oil and grease removal, etc.).\n\n4. The practice of removing some portion of the suspended solids and organic matter in wastewater through sedimentation. Common usage of this term also includes preliminary treatment to remove wastewater constituents that may cause maintenance or operational problems in the system (i.e., grit removal, screening for rags and debris, oil and grease removal, etc.).\n\n5. Basic wastewater treatment method that uses settling, skimming, and (usually) chlorination to remove solids, floating materials, and pathogens from wastewater. Primary treatment typically removes about 35 percent of biochemical oxygen demand (BOD) and less than half of the metals and toxic organic substances.",
  "subject": "Water",
  "references": [
    "Environmental Issues Terms & Acronyms; Terms of Environment",
    "Sediment Total Maximum Daily Loads (TMDLs) Glossary; Urban Watershed Management Research Terminology",
    "National Pollutant Discharge Elimination System (NPDES) Glossary",
    "NPDES Permit Writers Manual Glossary",
    "Urban Watershed Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/primary-treatment/"
}