If you are replacing an old septic system or installing a new one, you may be wondering what the difference is between aerobic and anaerobic systems. While most residential homes use an aerobic septic system, most municipal sewage water treatment operations use anaerobic systems. The biggest difference is the use of oxygen in the bacteria breakdown process, which aerobic uses and anaerobic does not. This crucial difference changes the speed, efficiency and price between the two systems dramatically.
Anaerobic Septic Systems
The most common septic system used for residential homes is the anaerobic system, due to its affordability and ease of use. This system relies on a two step process for water treatment, first treating the wastewater in the septic tank, then diverting the effluent to the drain or leach field for further filtering. This is a slow process, which can lead to backups in the system when there is heavy use.
Aerobic Septic Systems
The reason that most municipalities in the United States use aerobic water treatment for sewer waste is efficiency. Although these systems are more expensive, they are faster than anaerobic systems and result in cleaner wastewater. Effluent leaving an aerobic system is about 98% clean, versus usually less than 65% with an anaerobic system. Although mostly used commercially, these systems are also available for residential use.
For many homeowners buying a new septic system, budget is a major concern. The traditional anaerobic system will do the job sufficiently, plus they are usually much less expensive and easier to maintain. However, for large households, it may be worth the investment in an aerobic system that can process waste faster and more efficiently, reducing the frequency of potential backups and septic service problems.
Posted on behalf of Keith Lee, Metro Septic and Plumbing
