The best water treatment plant manufactures1. Wastewater Treatment Treating wastewater collected from the industrial, commercial and household structures is the most usual application of a water treatment plant. The physical, chemical, biological and radioactive pollutants are removed that are present in the wastewater. Two commonly used treatment processes followed here are sludge treatment and sewage treatment. 2. Surface treatment This process may be followed by a plant to cleanse surface water for municipal usage. In this process, the colloidal matters, organic components and suspended impurities present in the surface water are usually removed using treatment processes like screening, aeration, sedimentation, sand filtration and disinfection.