Umair Gaines
Septic systems are underground wastewater treatment structures that are most common in rural areas without sewer access. They treat household plumbing wastewater via a septic tank and a drainfield. Septic tanks are an essential part of an onsite septic system as they filter sewage into effluent. The tank itself is independent of electricity, but some systems may include electrical components that require electricity to operate. For example, if the absorption trench is not positioned below the tank, an electrically powered pressurised pipe may be required to move the effluent. Septic tank pumps, which are used in systems that are not gravity-fed, are another example of an electrical component.
| Characteristics | Values |
|---|---|
| Type of Septic System | Aerobic |
| Oxygen Usage | Requires oxygen to treat waste |
| Efficiency | More efficient than traditional septic systems |
| Wastewater Treatment | Requires constant power supply to operate mechanical parts |
| Mechanical Parts | Air pumps, aerators, blowers, control panels, and pumps |
| Power Outages | Risk of system failure during power outages |
| Electricity Bills | Higher electricity bills |
| Ventilation | Requires proper ventilation to avoid unpleasant odors and harmful gases |
| Insulation | Requires insulation in cold climates |
| Maintenance | Requires regular maintenance and inspections |
| Installation Costs | More expensive to install than conventional systems ($20,000 to $40,000) |
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What You'll Learn
Aerobic vs anaerobic systems
Septic tanks are an essential part of onsite septic systems as they filter sewage into effluent. The septic tank itself is independent of electricity, but some systems may include electrical components. For instance, if the effluent needs to be pumped to a higher level, an electrical pump may be required.
Aerobic and anaerobic septic systems are the most notable types of septic systems. Both systems have advantages and disadvantages, and the decision to choose one over the other is unique to each home and household.
Aerobic septic systems use oxygen to break down organic matter in wastewater. They typically consist of a tank that introduces air into the waste, promoting the growth of aerobic bacteria, which are highly efficient at decomposing organic material. Aerobic systems can be used in a greater variety of settings due to their adaptability to changing soil conditions. They are also more versatile and can handle higher volumes of wastewater, making them suitable for larger households. The cleaner effluent produced by aerobic systems can be safely released into the groundwater, making it particularly beneficial in environmentally sensitive areas. However, aerobic systems rely on electricity to function, which can be a drawback in areas prone to power outages.
Anaerobic septic systems, on the other hand, operate without oxygen, using anaerobic bacteria to break down organic matter. These systems are simpler in design and operation, requiring less maintenance and fewer inspections. They are also more cost-effective, making them a popular choice for many homeowners. However, anaerobic systems are less efficient at treating wastewater, resulting in effluent that may not be as clean as that produced by aerobic systems. The decomposition process in anaerobic systems is also slower, necessitating regular septic tank pumping to prevent overflow. Additionally, the anaerobic decomposition process can produce unpleasant odors, which can be a drawback for homeowners and their neighbours.
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Electricity costs
The electricity costs of an annual septic system depend on the type of system installed. Septic systems are usually gravity-fed, but some require electricity to operate.
Gravity-fed systems are designed to allow gravity and the pitch of the system pipes to move the waste into the septic tank and then out of the tank into the leach or drainage field. These systems are independent of electricity and have a lower running cost.
However, if a septic tank is designed with a pump, it will need electricity to operate. The electricity cost to operate the ATU effluent pump is between $25 and $250 per year, depending on electricity rates and where you live. The cost of aerobic septic supplies, such as filters and chlorine tablets, is an additional expense, typically costing $200-$300 per year.
Alternative septic systems with electrical float switches, pumps, or mechanical components should be inspected more often, generally once a year, and these systems may have higher electricity costs due to their electrical components.
It is important to note that during a power outage, a septic system with a pump may stop working, preventing effluent from being pumped to the drain field. This can cause the pump tank to fill up and potentially back up into your home if water continues to be used. Therefore, it is crucial to minimize water use during a power outage to avoid overloading the system.
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Maintenance
Aerobic septic systems are a modern and cost-effective method for wastewater treatment, offering many advantages over traditional anaerobic systems. However, they require regular maintenance due to their intricate components and mechanical parts.
Regular Inspections and Monitoring
It is recommended to have professional inspections at least once a year or once every three years, depending on the system's complexity. During inspections, a certified septic service provider will check for leaks, measure scum and sludge levels, and assess the tank's structural integrity.
Proper Pumping Schedule
Aerobic septic systems require regular pumping to manage sludge buildup. The EPA suggests pumping every 3-5 years, or when the sludge layer is within 12 inches of the outlet.
Cleaning and Additives
Proper cleaning and the use of appropriate additives are essential for maintaining aerobic septic systems. This includes using septic-safe products and avoiding harmful chemicals, grease, oil, and non-biodegradable items.
Component Replacements
The complex components of aerobic septic systems, such as air pumps, diffusers, and chambers, may require potential replacements over time. Regular maintenance can help identify issues early on and prevent malfunctions.
Electricity Usage
Aerobic septic systems rely on electricity to power aerators, pumps, and other components. This ongoing energy consumption adds to maintenance costs and makes the system vulnerable to power outages. Having a backup power source, such as a generator, is recommended to mitigate potential system failures during outages.
Regulatory Compliance
Depending on your location, there may be stricter regulatory requirements for the installation and maintenance of aerobic septic systems. It is important to stay informed about local laws and environmental standards to ensure compliance.
Specialized Expertise
Maintaining aerobic septic systems may require specialized technical knowledge and expertise. Not all septic service providers are equipped to handle these complex systems, so finding qualified professionals is essential.
By following these maintenance practices, homeowners can ensure the optimal performance, longevity, and environmental responsibility of their aerobic septic systems.
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Leach field size
Most septic tanks do not need electricity to operate as they are designed with a siphon to allow gravity to move wastewater from the tank to the drainage field. However, some systems may include electrical components that require electricity to operate. For example, if the drainage field is at a higher elevation than the septic tank outlet, a gravity-based siphon system cannot be used, and an electric pump is required to move the effluent.
The size of a leach field depends on several factors, including the number of bedrooms, soil percolation rate, and local regulations. It can range from a few hundred to several thousand square feet. A general rule is to allow for approximately 100 feet of leach field trench per bedroom, but this can vary based on specific site conditions. The leach field size is important because it ensures that the system can handle the amount of wastewater produced by the household and allows for adequate treatment of the effluent before it reaches the groundwater.
The distance between a leach field and a septic tank is typically at least 10 feet but can vary depending on local regulations and the design of the septic system. A leach field works by dispersing effluent from a septic tank into the soil through perforated pipes. The soil acts as a natural filter, where microbes break down and treat the effluent, removing harmful pathogens and nutrients before it reaches groundwater.
The required size of a leach field trench is determined by the local regulatory body, such as the Nebraska Department of Environmental Quality (NDEQ). For example, the minimum required size for a three-bedroom house with a mid-range percolation rate of 25 minutes per inch is 750 square feet. The size and location of the leach field also impact the cost of installation and replacement, which typically ranges from $5,000 to $20,000 or more.
In summary, the size of a leach field depends on the number of bedrooms, soil characteristics, and local regulations. It is important to ensure that the leach field is properly sized to handle the amount of wastewater produced by the household and to allow for adequate treatment of the effluent before it reaches the groundwater.
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Environmental impact
The environmental impact of a septic system depends on various factors, including the type of system, environmental conditions, and local regulations. Here are some key considerations regarding the environmental impact of aerobic septic systems:
- Effluent Quality: Aerobic septic systems produce higher-quality effluent than conventional anaerobic systems. The additional oxygen injected into the treatment tank increases bacterial activity, resulting in more effective treatment of nutrients in the effluent. This leads to cleaner wastewater being discharged into the soil or drain field, reducing the potential impact on groundwater and surrounding ecosystems.
- Leach Field Requirements: The improved effluent quality in aerobic systems allows for smaller leach fields. This is advantageous in environmentally sensitive areas and where space is limited. Smaller leach fields also result in reduced land disturbance and less disruption to natural habitats.
- Soil Conditions: Aerobic septic systems are well-suited for certain soil conditions. They can be effective in areas with poor soil conditions, shallow soil depth, or inadequate soil types that may not support conventional septic systems.
- Water Bodies: Aerobic systems are preferable for homes close to sensitive water bodies or areas prone to high water tables. The more efficient treatment process reduces the risk of contaminating nearby water sources with untreated or partially treated wastewater.
- Energy Consumption: Aerobic septic systems require a constant supply of electricity to power the air pump and other components. This increases overall system costs and may have an impact on energy consumption, particularly in areas with limited access to renewable energy sources.
- Maintenance and Chemicals: Regular maintenance is necessary to manage sludge buildup and maintain bacterial activity in aerobic systems. This includes periodic replacement of disinfectant tablets and electrical components. Proper maintenance ensures the system functions effectively, reducing the risk of environmental contamination due to system failures.
- Wastewater Treatment: Aerobic systems offer faster and more efficient waste breakdown compared to anaerobic systems. They can be advantageous in households with high wastewater production, reducing the potential for overflow or inadequate treatment.
- Climate Considerations: Evapotranspiration systems, a type of aerobic treatment, have specific climate requirements. They are most suitable in arid climates with adequate heat and sunlight, as they are susceptible to failure in regions with high rainfall or snowfall.
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Frequently asked questions
Yes, aerobic septic systems require a constant power supply to operate their mechanical parts, such as air pumps and aerators. This means higher electricity bills and the risk of system failure during power outages.
An aerobic septic system is a type of wastewater treatment system that uses oxygen to break down waste more efficiently than traditional septic systems. These systems incorporate mechanical parts to create an oxygen-rich environment, enabling aerobic bacteria to thrive and treat wastewater effectively.
Some benefits of aerobic septic systems include:
- More efficient waste breakdown
- Smaller drain fields
- Better for the environment in treating wastewater
- Higher quality effluent
Some drawbacks of aerobic septic systems include:
- Higher installation and electricity costs
- More complex and mechanical parts that can fail
- Requires regular maintenance and inspections
