The article discusses various processes and impacts of sewage treatment. It explores how sewage can be treated for agricultural use, the disposal of sewage sludge, and the behavior of pharmaceuticals during treatment. The researchers also studied the environmental impact of sewage water pollution and the disposal of municipal sewage sludge in China. Additionally, they looked into the removal of color and organic matter from recycled wastewater, as well as the degradation of octylphenol using sunlight radiation. Overall, the study highlights different methods and their effects on sewage treatment and disposal.