| Main Entry: | primary treatment1 |
| Part of Speech: | n |
| Definition: | a basic wastewater treatment method that uses settling, skimming, and often chlorination to remove solids, floating materials, and pathogens from wastewater |
| Example: | Primary treatment typically removes about 35 percent of biochemical oxygen demand (BOD) and less than half of the metals and toxic organic substances. |
| Etymology: | 1919 |
| Main Entry: | primary treatment2 |
| Part of Speech: | n |
| Definition: | primary care |
| Etymology: | 1808 |
| Usage: | medical |