What effect does adding CO2 to a septic tank have?

Adding carbon dioxide (CO2) to a septic tank helps reduce the pH of the effluent because CO2 can form carbonic acid when it dissolves in water. This reaction leads to an increase in hydrogen ions in the solution, which lowers the pH, making the environment more acidic.

The biological processes occurring within a septic tank are sensitive to pH levels. A more acidic environment can enhance the solubility of certain nutrients and may affect the types of bacteria present. These conditions can influence the efficiency of the decomposition of organic matter by the microbial community in the tank. Maintaining optimal pH levels is crucial for the proper functioning of the septic system, as it ensures that the microorganisms responsible for breaking down waste can thrive. Thus, the addition of CO2 effectively promotes a healthier environment for these bacteria by managing the pH levels within the septic tank.