Translating…
What is a Septic Tank?
Septic tanks are used where there is no access to public sewerage. They receive and partially breakdown sewage from homes and offices that are not connected to mains drainage. They can be constructed from concrete, bricks, blocks and, more recently, plastic and fibreglass.
The plastic and fibreglass models are the better choice as the tank material is inert and not attacked by the septic tank gasses.
Septic tanks are installed below the ground and connected to the waste from kitchen sinks, toilets, bathroom showers and washing machines.
The capacity of the tank ranges from 2700 Liters for a 2 bedroom house to 3500 Litres for a five bedroom house, and the maximum size that the Environment Agency will allow is a septic tank for 15 persons.
The solids and liquids are normally separate out Inside the tank and the waste products form three levels. The topmost layer is named the scum layer which is composed of the grease, oil and floating debris.
The middle layer is the liquid effluent and then the bottom layer is the settled solids level where the solids are stored.
The liquid effluent middle layer discharges into the drain-field or leach-field.
The outlet has a drain which leads to the drain field. The liquid that goes to the drain-field is biologically digested by the natural bacteria that are found in the soil.
Some of he scum and the settled solids are also slowly and gradually converted biologically by the very same microorganisms and changed to the effluent part or central layer. The remaining solids must be emptied by tanker annually.
The drain-field soil contains aerobic bacteria and anaerobic bacteria. Aerobic bacteria are microorganisms that need oxygen to survive while anaerobic bacteria don’t need oxygen in order to survive. These microorganisms break down the septic liquid to harmless water and carbon dioxide that are eventually absorbed into the deeper adjacent soils.
Septic systems discharge hazardous gases which smell and which are damaging to the environment. They are the by-product of the breakdown of organics by the anaerobic microbes present in the tank.
These are vented away from nose level by the Soil Vent Pipe on the house wall.
These vents are pipes that act as outlets for the gases and the unwanted gases are released into the air.
Find out more about your Sewage Treatment System by simply clicking on and browsing high quality sewage websites. There is a great deal of information available. Try reading various websites to get a better idea of your septic tank system.