What is the primary use of lime in wastewater treatment?

The primary use of lime in wastewater treatment is to increase alkalinity in sour digester environments. Lime, which is a strong alkaline material, helps balance the pH levels in the digestion process. This addition of lime adjusts the acidity of the environment, promoting optimal conditions for microbial activity. When the pH is raised, it aids in the stabilization of the sludge, ultimately enhancing the efficiency of the anaerobic digestion process.

This adjustment not only helps in maintaining the required conditions for bacteria to thrive but also assists in improving the overall quality of the effluent being treated. A correct balance of alkalinity is critical for preventing issues like acid accumulation, which can negatively impact digestion efficiency and lead to operational problems in wastewater treatment facilities.