Although most people think of a conventional system when they think of a septic system, there are actually several different types of systems. These are generally broken into two categories, conventional and alternative, with different types in each. With new technology and a greater concern for the environment, the types of septic systems available is constantly growing and changing.
Conventional Septic Systems
There are two types of conventional sewer systems: gravity and pressure. Both consist of a septic tank and drain field, but the way the waste water or effluent is distributed to the drainfield is different. Basic or standard systems use a gravity flow system. However, most newer conventional sewer systems use pressure, which uses a pump to more evenly disperse waste water throughout the drainfield.
Alternative Septic Systems
Alternative septic systems are generally used in areas where a conventional drainfield is not possible or prudent. These include:
- Aerobic Treatment Unit (ATU). An ATU uses oxygen to further breakdown solids within the septic tank to release cleaner waste water into the drainfield. This is often used when the drainfield is not able to properly treat the waste water, or in environmentally sensitive areas.
- Sand filter systems. A sand filtration system is usually made with a concrete box which contains sand and gravel to filter waste water before it is pumped to a drainfield. This is typically used in areas without sufficient soil for the treatment of waste water.
- Mound system. In areas which do not have the soil capacity for proper treatment of waste water before it enters the ground water, a mound system may be used. This essentially raises the drainfield above the ground and is man-made.
If you are replacing an old septic or creating a new system, talk to your septic professional about what would work best for your property. There are also other proprietary systems which may be a good fit for your needs.
Posted on behalf of Keith Lee, Metro Septic and Plumbing
