What Is an Aerobic Septic System?

An aerobic septic system is an advanced wastewater treatment system that relies on aerobic bacteria to treat and break down household sewage. Unlike conventional septic systems, which use anaerobic bacteria (bacteria that thrive without oxygen), aerobic systems introduce oxygen into the system to encourage aerobic bacteria to grow. These organisms are more effective in breaking down organic matter.

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These systems are particularly beneficial in areas with poor soil conditions, high groundwater tables or where conventional septic systems might fail to properly treat wastewater. They are designed to be more environmentally friendly and efficient, providing a higher quality of effluent (treated water) that can be discharged into the environment without worry of contamination or health threats.

Aerobic Vs. Anaerobic Septic Systems

The primary difference between aerobic and anaerobic septic systems lies in the type of bacteria they use to treat wastewater and the presence of oxygen in the system.

Oxygen Usage

Aerobic Septic Systems: These systems introduce oxygen into the treatment process, typically through an air compressor or aerator. The presence of oxygen supports the growth of aerobic bacteria, which are just better at breaking down organic material in wastewater than their anaerobic cousins.

Anaerobic Septic Systems: Traditional septic systems operate in an oxygen-free environment. Anaerobic bacteria, which thrive without oxygen, break down the waste. While effective, anaerobic bacteria are slower and less efficient than their aerobic counterparts.

Efficiency and Quality of Treatment

Aerobic Systems: Due to the presence of oxygen and the more efficient bacteria, aerobic systems treat wastewater more thoroughly. The effluent produced is cleaner and can even be discharged above ground if properly treated.

Anaerobic Systems: The treatment process is less thorough, often resulting in effluent that still contains higher levels of pollutants. This effluent is usually discharged into a drain field where further natural filtration occurs, but it is not as clean as that from an aerobic system.

Septic Tank System Design

Aerobic Systems: These systems are typically more complex, requiring additional components like an air compressor or aerator, a pump and more frequent maintenance. However, they are more suitable for challenging environments.

Anaerobic Systems: Simpler in design, these systems usually consist of a septic tank and a drain field. They require less maintenance but are less effective in certain soil conditions.

How Does an Aerobic Septic System Work?

The aerobic septic system operates through several stages, each crucial to the effective treatment of wastewater. Here’s a step-by-step breakdown of how an aerobic septic system works:

Pre-Treatment Stage

Wastewater from the household flows into a pre-treatment tank, often a conventional septic tank. In this tank, heavier solids settle at the bottom, while lighter materials like grease and oils float to the top and create a kind of scum layer.

The pre-treatment stage allows for the initial separation of solid waste from the liquid, reducing the burden on the subsequent treatment stages.

Aeration Chamber

The partially treated wastewater from the pre-treatment tank then moves into the aeration chamber. This is the heart of the aerobic system.

An air compressor or blower pumps oxygen into the aeration chamber, creating an oxygen-rich environment. This oxygen is essential for the survival and activity of aerobic bacteria.

Aerobic bacteria break down the organic matter in the wastewater much more efficiently than anaerobic bacteria. The result is a significant reduction in pollutants and organic material.

Clarification/Disinfection Chamber

After the aeration chamber, in some systems, the wastewater flows into a clarification chamber. Here, any remaining solids or organic particles are allowed to settle out. And the aerated fluids will pass through a chlorinator or ultraviolet light to kill any remaining pathogens. This ensures that the effluent is safe for discharge or reuse.

Final Discharge

The treated and disinfected effluent is then discharged from the system. Depending on local regulations and the design of the system, this water can be released into a surface water body, absorbed into the soil, or used for irrigation purposes.

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Environmental and Practical Benefits of Aerobic Septic Systems

Aerobic septic systems offer several advantages over conventional systems, particularly in terms of environmental impact and versatility.

Environmentally Friendly

Due to the thorough treatment process, aerobic systems produce cleaner effluent, which reduces the risk of groundwater contamination. This is especially important in areas with high water tables or near bodies of water.

The ability to recycle treated water for irrigation or other non-potable uses also helps conserve water, making aerobic systems a sustainable option.

Suitable for Challenging Conditions

In areas where soil conditions are not conducive to traditional septic systems, such as clay-heavy soils or areas with high groundwater, aerobic systems are more reliable. They can effectively treat wastewater even when soil absorption is not ideal.

Higher Treatment Capacity

Aerobic systems can handle a greater volume of wastewater than anaerobic systems, making them suitable for larger households or properties with high water usage.

Flexibility in Installation

These systems can be installed in locations where conventional systems would fail, providing greater flexibility in property development and land use.

Aerobic Septic System Maintenance Considerations

While aerobic systems offer many benefits, they also require more maintenance than conventional systems. Regular inspections, cleaning and servicing of components like the air compressor, pumps and treatment tanks are necessary to keep the system functioning properly. Homeowners should be aware of the ongoing maintenance requirements, which may include professional servicing and periodic pumping of the pre-treatment tank.