What is commonly used to increase the alkalinity in wastewater treatment?

The use of calcium carbonate to increase alkalinity in wastewater treatment is effective due to its chemical properties. Calcium carbonate acts as a buffering agent, which helps to stabilize pH levels in the wastewater. When added, it dissociates to release carbonate and bicarbonate ions, which can effectively neutralize acids present in the wastewater. This process helps maintain a more balanced pH, promoting optimal conditions for biological treatment processes.

Additionally, calcium carbonate is relatively inexpensive and widely available, making it a practical choice for many wastewater treatment facilities. Increases in alkalinity are crucial for the efficient operation of biological treatment processes, as they support the growth of microorganisms that help break down organic matter.

While other options like lime, sodium bicarbonate, and potassium hydroxide can also influence alkalinity, calcium carbonate is particularly favored for its efficiency and buffering capabilities in various treatment scenarios.