It provides a very rough method of treating waste for properties that are not connected to the main drainage.
Many septic tank systems around the world have certainly not maintained and did not work correctly and pollution control laws are there to limit the number of environmental and health risks they cause. You can also know more about the septic tanks via https://ecoseptic.com.au/
In many cases, you have to install a sewage treatment plant system. Every time get a sewage system checked by a specialist wastewater system before buying the property to prevent pollution problems.
Working Of Septic Tanks
Raw sewage and waste water from showers, a kitchen and so on, release into the tank, where solid waste is separated from the liquid waste. Oils and fats float on the top of the tank and form a layer of crust.
Feces and food waste sinks to the bottom of the tank and form a layer of mud. Anaerobic bacteria that are naturally invaders in the tank "digest" this sludge up to 70%.
Dirty water flows from the septic tank to a soakaway or drain field. Baffles or a pipe ‘T’ in the tank hold back the floating crust and prevents it from entering the tank outlet.
So that mud and crust layer does not become too deep, the septic tank must be emptied every year. It also prevents a higher concentration and higher than the suspended solids wash out into the soakaway.
The solids can block the drainage system of air space in the soil, creating drainage problems and septic tank waste will not be able to soak away or treated by a natural soil bacterium.