CHEMICAL FILTRATION PROCESSES

Abstract

Chemical filtration processes play a critical role in removing dissolved and molecular-scale contaminants from water, air, and industrial fluids where mechanical filtration alone is insufficient. This article explains the main chemical filtration mechanisms—adsorption, ion exchange, chemical precipitation, coagulation–flocculation, catalytic filtration, and chemically enhanced membrane systems—highlighting how each method captures, transforms, or immobilizes pollutants. Key operational factors such as contact time, flow distribution, pH, temperature, and competitive contamination effects are discussed to show why design conditions strongly influence treatment efficiency. The article also addresses practical challenges including media saturation, regeneration waste streams, sludge formation, membrane fouling, and safety considerations in air filtration. Finally, it emphasizes integrated treatment trains that combine multiple chemical filtration methods to achieve stable performance and meet strict quality standards while improving sustainability through optimized chemical use and responsible waste management.