The document discusses wastewater treatment processes. It describes how wastewater treatment involves applying engineering techniques to change the physical, chemical, or biological properties of water so it can be disposed of safely. The treatment process includes pre-treatment to remove solids, preliminary treatment using screens and grit chambers, primary treatment using sedimentation to remove solids, secondary treatment using biological processes like trickling filters to further reduce organic matter, and final clarification before water is disposed of or reused. Sludge produced from treatment is stabilized and applied to agricultural fields. The wastewater treatment plant monitors water quality through testing.