Residential System Types, Low Presssure Dose (LPD), Aerobic, Mound, or Conventional
The basic onsite sewage facility (OSSF, or septic tank system ) is made up of several components.
First, the waste is collected in the house, through a series of pipes, then collected into a single pipe outside the home into a collection tank (septic tank) . In a conventional, ground-disposal type system, this is often a two-compartment septic tank.
Next, some type of pre-treatment occurs, either in the septic tank or some type of treatment unit, such as an aerobic treatment unit (ATU) or sand filter system.
Next, the effluent is disposed of on or in the ground. This can be a spray system, a drip irrigation system, a low pressure dose system (aka: drip tubing, or pipe and gravel), or a mound system.
Typical Aerobic Treatment Layout
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