| Porta-Tank | Porta-Tank: A Versatile Solution for Li… | Environmental Hea… |
| Portland cement | Portland Cement in Environmental & Wate… | Air Quality Manag… |
| Posi-Clean | Posi-Clean: A Revolution in Environment… | Water Purification |
| Posirake | Posirake: A Legacy in Reciprocating Rak… | Wastewater Treatm… |
| positive crankcase ventilation (PCV) | Positive Crankcase Ventilation (PCV): A… | Air Quality Manag… |
| positive displacement pump | Positive Displacement Pumps: Essential … | Wastewater Treatm… |
| Positive Seal | Positive Seal: Ensuring Efficient and R… | Wastewater Treatm… |
| post chlorination | Post-Chlorination: The Final Line of De… | Water Purification |
| post-closure | Post-Closure: A Vital Stage in Environm… | Environmental Hea… |
| post treatment | Post-Treatment: Polishing the Final Pro… | Water Purification |
| potable reuse | Potable Reuse: A Sustainable Solution f… | Sustainable Water… |
| potable water | Potable Water: The Lifeblood of Our Wor… | Water Purification |
| potassium permanganate | Potassium Permanganate: A Versatile Too… | Water Purification |
| potentially responsible party (PRP) | The Weight of Responsibility: Understan… | Environmental Pol… |
| potential of hydrogen | The pH Scale: A Key to Environmental & … | Water Quality Mon… |
| potentiation | Potentiation in Environmental & Water T… | Water Purification |
| potentiometric surface | Understanding the Potentiometric Surfac… | Resource Manageme… |
| POTW | POTWs: The Unsung Heroes of Water Treat… | Wastewater Treatm… |
| POU | Point-of-Use (POU) Water Treatment: Bri… | Water Purification |
| pounds per square inch, absolute (psia) | Understanding psia: A Key Metric in Env… | Water Purification |
