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Septic tanks
Septic tank - Solution for areas without sewer
Septic tanks operating principles

These are actually some waterproofing underground reservoirs that collects all wastewater produced in households equipped with running water to be drained and coarse being taken by emptying and then treated in wastewater treatment plants.

They have the great advantage that them don’t need to be drained often involving low costs (a family of five people consume about 1,000 liters per day waste water) nor emit unpleasant odors. These devices are easily controllable in case of failure and are commonly used for any situation, even temporary situations (construction sites, sewage systems in areas with work etc.

septic tanks operating principles

Untreated sewage and waste results in households will soon clog up and the more porous soils. Septic tanks recondition waste water to allow water filtration and its subsequent flow into the lower layers of soil. The most important function is to protect the green pit absorption capacity of soil. To achieve this, the ecological septic tank has the following functions:

- Separation of solid waste (tailings) from the liquid.
When sewage enters the septic tank organic, flow rate diminishes, and solid waste is deposited in the bottom of the tank (pond). Fat and other light solids rise to the surface, forming a crust. Deposits and upper crust are retained (by the second compartment, IMHOFF separator), while the purified fluid is discharged in the third compartment where aerobic decomposition takes place (in the presence of air) and will be discharged into the drainage field (following the aerobic decomposition) for reabsorption into the soil.

- Storage of fat deposition and crust.
Solids sink to the bottom of the tank, more accurate in the first compartment named DECANTOR forming deposits and the crust is actually a floating layer of fat that is solid and prevented by the second compartment (IMHOFF separator) to pass in the third compartment, WASH CAMERA. Fat deposition and crust deposits are decompose in time and their volume shrinks.

Areas with warmer climates allow complete decomposition of deposits, unlike those with lower temperatures. For this reason, generally warmer regions septic tanks should not be emptied or cleaned as often as those in cooler regions. Regardless of climate, residue remains in the tank, and because of this tank must be large enough to effectively capture and store solids between two empties. If the solid waste fill the tank and enters in the system of drainage pipes on the field, they can clog soil.

Fat resulting in kitchens is harmful to the functions of the septic tank. The best way to throw the fat would be putting them in old containers and disposing in the trash rather than dump it in the tank.
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