Extended Aeration with Anaerobic Digestion (EAAD) STP is a packaged treatment plant that uses a combination of biological processes to treat wastewater. The EAAD process involves the use of an aerobic-activated sludge system that is followed by an anaerobic digestion process. This system is designed to provide effective treatment for wastewater that has a high organic load and can produce sludge that is rich in nutrients.
In the aerobic activated sludge process, the wastewater is mixed with a culture of microorganisms that break down the organic matter in the wastewater. The microorganisms use oxygen to digest the organic matter and produce carbon dioxide, water, and new microorganisms. The sludge produced by the aerobic process is then treated in an anaerobic digester. In the anaerobic digester, the sludge is broken down by microorganisms that do not require oxygen. The process produces biogas, which is a mixture of methane and carbon dioxide, and a stabilized sludge that can be safely disposed of.
The EAAD process is an efficient and effective way to treat wastewater in a packaged treatment plant. The process can reduce the amount of organic matter in the wastewater by up to 95%, and it can also reduce the number of nutrients in the wastewater. The biogas produced by the process can be used as a renewable energy source, which can help to reduce the carbon footprint of the treatment plant. The stabilized sludge produced by the process can also be used as a fertilizer or soil amendment, which can help to reduce the need for synthetic fertilizers.