| phase | Phases in Environmental & Water Treatme… | Water Purification |
| phased reversal | Phased Reversal: Enhancing EDR Efficien… | Water Purification |
| PHC | Understanding PHC in Waste Management: … | Environmental Hea… |
| PHD | Understanding PHD: A Crucial Concept fo… | Wastewater Treatm… |
| PhD 2 | PhD 2 in Environmental & Water Treatmen… | Environmental Hea… |
| phenolphthalein | Phenolphthalein: A Colorful Tool for Wa… | Waste Management |
| phenolphthalein alkalinity | Understanding Phenolphthalein Alkalinit… | Waste Management |
| phenols | Phenols: A Persistent Threat in Waste M… | Environmental Hea… |
| pheromone | Pheromones: A New Frontier in Waste Man… | Waste Management |
| Phoenix | Phoenix Rising: Calgon Carbon's Odor Co… | Air Quality Manag… |
| Phoenix Press | Phoenix Press: A Reliable Solution for … | Wastewater Treatm… |
| Phoenix System | The Phoenix System: A Waste Management … | Waste Management |
| phosphate | Phosphates: A Crucial Element in Waste … | Resource Manageme… |
| phosphoric acid | Phosphoric Acid: A Powerful Tool in Env… | Environmental Hea… |
| phosphorous | Phosphorus: A Vital Nutrient with a Dar… | Environmental Hea… |
| Phostrip | Phostrip: A Biological Solution for Pho… | Wastewater Treatm… |
| Phosver | PhosVer: A Powerful Tool for Phosphate … | Water Quality Mon… |
| photic zone | The Photic Zone: Where Light Fuels Life… | Wastewater Treatm… |
| photocatalytic oxidation | Photocatalytic Oxidation: A Light-Power… | Eco-Friendly Tech… |
| photochemical smog | Photochemical Smog: A Silent Threat to … | Air Quality Manag… |
