Septic tanks are units that treat domestic sewage, replacing open-air sewage and so-called black septic tanks. They work by purifying the water coming from the toilets, so that it is returned to the environment causing minimal environmental impact. Bacteria act in the decanting, fermentation and filtration processes, transforming the waste from the pit into drinking water. They can be used in houses, farms and rural properties that are not served by a sewage system.
Only the waste that comes from the toilet enters the septic tanks. Thus, the water that comes from sinks and drains must follow another path. This is due to the possibility that the water that reaches the cesspool contains detergent and soap, substances that can kill the microorganisms that decompose the sewage.
The drum septic tank consists of three collection boxes that are located on the ground surface, work connected to the toilet and are interconnected by tubes and PVC. It is a process that uses fresh cattle manure to eliminate microbes and bacteria from human expelled waste. Through ‘biodigestion’, it is a natural liquid fertilizer, with no unpleasant smell or worms harmful to human health and the environment.
By: Raiane Gonçalves (Agronomist)
CREA MG 0400000248649
