Wastewater New York State Practice Exam

What is the primary objective of anaerobic digestion in wastewater treatment plants?

1. Remove nitrogen compounds

2. Reduce organic matter

3. Enhance phosphorus removal

4. Increase sludge volume

The correct answer is: Reduce organic matter

The primary objective of anaerobic digestion in wastewater treatment plants is to reduce organic matter. This process involves the breakdown of organic materials by microorganisms in an oxygen-free environment, resulting in the stabilization of the sludge and the production of biogas, which can be used for energy. By reducing the volume and organic content of the sludge, anaerobic digestion not only minimizes the amount of waste generated but also contributes to the overall efficiency of the wastewater treatment process. The effective reduction of organic matter helps to lower the biochemical oxygen demand (BOD) of the final effluent, ensuring that the treated water meets regulatory standards before being released into the environment. Furthermore, the stabilized sludge can be handled more easily and safely compared to untreated sludge. In summary, anaerobic digestion plays a crucial role in managing the organic load in wastewater, leading to better treatment outcomes and sustainability in wastewater management practices.