Septik Plus: Septic tank with filter
Septic tank filter. Closed tank in which sludge is in direct contact with domestic wastewater passing through the structure. Solid organic matter is partially decomposed by the action of anaerobic bacteria.
The pretreated water is streamed over the bacterial bed of a spe- cific mass of material (50 to 200 m2· m-3) serving as substrate for the microorganisms that form a film of variable thickness on it. Aeration is done by natural draft.
STEPS:
The digester-decanter receives all the domestic wastewater from the house and pretreats it. Composed of two compartments in which the decanting (faster than in a septic tank) and the digestion of the organic material present in the wastewater take place. An- aerobic bacteria, without oxygen, are responsible for metabolising organic matter by gasifying, hydrolysing and mineralising it.
Biological perculator filter: The microorganisms present in the wastewater and the oxygen supply by natural draft bring about the oxidation of the organic material. Use of a high-performance plastic substrate ensures the process is more effective and avoids the main- tenance problems of mineral substrates.