What are the three types of aeration basins in order of lineage of the Bardenpho process?

In the Bardenpho process, the sequence of aeration basins is crucial for effective wastewater treatment. The correct order is anaerobic, anoxic, and then aerobic.

In the anaerobic stage, conditions are created where microorganisms thrive without oxygen, allowing them to break down organic matter and release nutrients like phosphorus. This initial step reduces the load of organic material that will undergo further treatment.

Following the anaerobic stage, the anoxic basin allows the environment to shift again, where nitrate is available as the electron acceptor, promoting the process of denitrification. During denitrification, nitrogen compounds are converted to nitrogen gas, which is then released into the atmosphere, thus reducing nutrient pollution in the treated water.

Finally, the aerobic basin introduces oxygen into the environment, supporting aerobic microorganisms that effectively degrade the remaining organic matter. This stage is vital for the final polishing of the effluent to ensure that it meets discharge standards.

Understanding the correct sequence of anaerobic, anoxic, and aerobic stages not only supports effective nutrient removal but also facilitates the understanding of how each condition plays a specific role in the overall treatment process.