What is the purpose of chemical precipitation in wastewater treatment?

Chemical precipitation is a critical process used in wastewater treatment aimed at removing dissolved substances, particularly heavy metals and nutrients such as phosphates, from the water. During this process, specific chemicals are added to the wastewater that react with the dissolved substances, causing them to form solid particles or precipitates. These solid particles can then be separated from the liquid through sedimentation or filtration, effectively reducing their concentration in the treated water.

By employing chemical precipitation, treatment facilities can significantly improve water quality, ensuring that harmful substances are minimized before the water is released back into the environment or reused. This process highlights the importance of removing contaminants effectively to protect ecosystems and public health. Other options do not align with the primary function of chemical precipitation, which focuses specifically on the removal of dissolved substances through the formation of solid particles.