Septic tanks and septic systems are used when sewage treatment plants are not accessible. They safely treat and dispose of wastewaters produced in the bathroom, kitchen, and laundry. These wastewaters may contain disease and germs of 5 deadly diseases such as tetanus (lockjaw), diphtheria, pertussis (whooping cough), hepatitis B, and polio. The pollutants must be treated to protect health of the citizens and the environment. Septic systems are usually a permanent solution to wastewater treatment and disposal sometime there are displace by sewer pipes.
What Is a Septic System?
There are different types of septic tank, each with its own design. The conventional septic tanks are the most common and are used in North America. These are consisting of three main parts: the septic tank, the drain field, and the soil beneath the drain field.
Tank is a watertight concrete box which is about 9 feet long and 5 feet tall. It is buried in the ground just outside the home. The tank is usually precut from unbreakable concrete which can be obtained from concrete manufacturers. The septic tank temporarily holds household wastages and allows a small amount of preprocessing to take place.
The drainfield is also called the soil absorption field or nitrification field. The only purpose of the drainfield is to transport wastewater to the soil. By removing the chemicals and germs; the soil purifies the wastewater before they reach the groundwater or any near way surface waters such as rivers, lakes e.t.c.
What happens inside the tank?
Wastewaters from the household flows into the septic tank which include waters from the bathtub, shower and washing machine can contain germs or environmental pollutants. As wastewater flows into the tank, the solid materials settle down to the bottom and the lighter greases and fats float to the top which forms a scum layer, allows the liquid i.e. the sewage effluent to flows out of the tank. The tank's primary purpose is to keep hold of the solids while releasing sewage effluent to the drainfield.