| photooxidation | Photooxidation: Harnessing the Power of… | Eco-Friendly Tech… |
| photosynthesis | Harnessing the Power of the Sun: Photos… | Eco-Friendly Tech… |
| phototrophs | Harnessing the Sun: Phototrophs in Envi… | Eco-Friendly Tech… |
| Photovac | Photovac: A Powerful Tool for Environme… | Environmental Hea… |
| photovoltaic cell | Harnessing the Sun: Photovoltaic Cells … | Sustainable Water… |
| phreatic | Phreatic: A Key Term in Groundwater Man… | Sustainable Water… |
| phreatic surface | Understanding the Phreatic Surface: A K… | Sustainable Water… |
| phreatophyte | Phreatophytes: Water Guzzlers or Vital … | Sustainable Water… |
| pHREEdom | pHREEdom: A New Frontier in Cooling Wat… | Sustainable Water… |
| PHSA | PHSA in Environmental & Water Treatment… | Environmental Pol… |
| phys-chem | Phys-Chem: A Powerful Tool in Waste Man… | Water Purification |
| physical-chemical treatment (PC) | Physical-Chemical Treatment (PC) in Was… | Resource Manageme… |
| physical treatment | Physical Treatment: A Cornerstone of Wa… | Water Purification |
| phytoplankton | Phytoplankton: Tiny Algae with a Big Im… | Wastewater Treatm… |
| phytoremediation | Cleaning Up With Green Fingers: The Pow… | Environmental Hea… |
| phytotoxic | Phytotoxic Waste: A Silent Threat to Ou… | Environmental Hea… |
| PIC | Products of Incomplete Combustion (PICs… | Air Quality Manag… |
| Picabiol | Picabiol: A Powerful Tool in Potable Wa… | Water Purification |
| pickets | Pickets: The Unsung Heroes of Gravity T… | Wastewater Treatm… |
| pickle liquor | Pickle Liquor: A Waste Product with Pot… | Waste Management |
