Chemical precipitation is utilized to remove dissolved contaminants, particularly heavy metals such as lead, mercury, and cadmium. In this process, chemicals are added to the water that react with the dissolved metals to form solid precipitates. For instance, lime (calcium hydroxide) can be used to precipitate calcium phosphate and reduce phosphorus levels, which is crucial for controlling eutrophication in water bodies. After precipitation, the solids can be removed from the water through sedimentation or filtration.
4. Use of Buffering Agents In some cases, buffering agents may be added to stabilize pH levels against fluctuations. This is particularly relevant in industries where pH stability is critical for process efficiency.