Types Of Septic Systems


Wastewater is treated as you travel through this layer of sand and into the natural soil. Plastic septic tanks have a specific gravity of approximately 0.97, which is less than the specific gravity of the water, which drives the tank […]

Wastewater is treated as you travel through this layer of sand and into the natural soil. Plastic septic tanks have a specific gravity of approximately 0.97, which is less than the specific gravity of the water, which drives the tank when the groundwater level is closer. Therefore, before installing a plastic septic tank, one should examine the groundwater level of that specific area or provide an anchor to the tank so that the tank can be eliminated or displaced. The wastewater enters the first chamber of the tank, allowing the solids to settle and eject the slag. The liquid component flows through the partition to the second chamber, where greater sedimentation is performed. Excess fluid, now in a relatively clear state, flows from the outlet to the septic discharge field, also known as the leaching field, drainage field, or filtration field, depending on location.

It is linked to the requirements and recommendations of a designated department that oversees septic tank facilities, often the health department. To find out how suitable the floor is for a septic tank system, a certified professional must come to the proposed installation area for certain tests. The most common test is a soil percology evaluation, often called a perc test.

Conventional septic systems include gravity systems and pressure distribution systems. An ATU depends on oxygen to decompose solid waste, resulting in “cleaner” wastewater over conventional types of septic systems. Oxygen is needed to support the growth and nutrition of aerobic bacteria in the septic tank. Aerobic bacteria digest or decompose solid waste from home or office facility.

In ISFs, wastewater is applied in periodic doses to a bed of sand or other suitable means. The design can also use a range of siphons instead of a dosing tank where the use of electricity is not feasible due to the location of the system or social and religious beliefs. As the wastewater passes through the sand filter, treatment is carried out through physical, chemical and biological actions.

The sand filter is often covered in PVC or a concrete box filled with sand material. The effluent is pumped through the pipes at the top of the filter at low pressure. The effluent leaves the pipes and is treated while filtering through the sand. The type of underground floor plays a key role in the effectiveness of the system and, therefore, in the size of the septic tank.

View and document event counters, timers, flow meters, and alarm conditions if present. Alternative septic tanks work in the same way as a conventional system, where gravity is used to collect waste in the tank, but they rely on oxygen to help break down waste in the tank with a motor or pump. This means that the cleanest wastewater is pushed into the discharge fields, which may require up to half the space of a normal discharge field. The average cost of an alternative septic system is between $ 6,000 and $ 15,000. Some are designed to better house houses that are on a hill or have poor drainage. Others work efficiently and safely with existing soil layers to allow natural purification before they reach groundwater level.

Approved alternatives can also be used, such as camera products or grouped expanded polystyrene distribution products. Soil is used as a primary treatment medium to remove smaller particles and organic matter . Research confirms that 2 to 4 feet of unsaturated soil is required to completely remove bacteria, viruses, and protozoa from wastewater. The design and size of the septic system can vary widely, from the interior to the entire country, due to a combination of factors.

The boundaries are rock, sand, and gravel, dense, compacted layers, and groundwater levels. About 53 percent of Ohio’s soils have limiting layers at shallow depths that do not provide adequate 36-inch soil, as shown in Figure 1. In these areas, hill systems are often used to remove pollutants from wastewater to protect human health and the environment.

Depending on the installed depth of the turffilter, a dose pump may be required to elevate the wastewater to the soil absorption system. The gravity distribution to the filter allows the wastewater to adhere to the peat and reduce the flow of wastewater through the filter. With a pressure distribution system, the wastewater is applied uniformly on the peat surface, allowing rapid infiltration. Due to the high degree of pretreatment, the size of the soil absorption can be reduced by 25 to 30%, reducing system costs. Aerobic septic tank systems provide an oxygen-rich environment for organisms and bacteria that reduce the organic part of waste. A special feature of aerobic septic systems is that they need oxygen to function and that the ATU is equipped with a mechanism that injects and circulates air into the aerobic tank.

Septic systems are a type of decentralized wastewater system that is widely used in areas without centralized sewerage. Conventional septic systems generally consist of a buried waterproof container called a septic tank and a shallow covered soil absorption field called a discharge field. These systems use a combination of technology and natural processes to partially Wastewater Expert Witness treat domestic wastewater from bathrooms, kitchen drains, and laundry. Superficial trench placement in LPP plants promotes evaporation and improves the growth of bacteria. Improved dispersion through pressurized sides extends the effluent more evenly throughout the drainage field. Periodic dosing and rest cycles improve and stimulate aerobic conditions in the soil.