Two-chamber cesspool of concrete rings: the better the single-chamber + step-by-step installation

A cesspool without a bottom is the simplest sewer construction appropriate in any country house. Even the greenest beginner-builder can do such a device. However, a two-chamber cesspool of concrete rings, the creation of which is not much more difficult, solves the problem of wastewater removal somewhat more efficiently.

The principle of design and operation of such a design

Ready-made concrete rings are perfect for wall cladding in a regular cesspool without bottom. They just need to be lowered to the bottom, and then sealed up and waterproofed. This is easier than concreting the walls of a cesspool or laying a brick. Such sewer devices are perfect for a summer house, which is used only in the summer, on weekends and on holidays. If the volume of effluent exceeds cubic meters per day, it is worth considering the construction of a two-chamber device.

At the same time, the amount of work will increase at least twice, since you will have to actually dig two holes, concrete the bottom in one of them, arrange drainage in the other, etc.

As a result, the efficiency of wastewater treatment will increase several times. First, the waste of human life will fall into the first pit, the bottom of which is carefully concreted. In this compartment, solid particles will settle at the bottom, slowly processing during fermentation and turning into sludge. This part of the cesspool of concrete rings must be cleaned periodically.

Tip: To improve the processing of solid waste, special anaerobic bacteria cultures are added to the sump. It should be remembered that such organisms do not tolerate the presence of chlorine-containing components in water.

The sump is connected by an inclined pipe to the second compartment of the cesspool, which is a drainage well. The bottom of this pit is not concreted, but is covered with a layer of drainage. Wastewater, partially treated in the first compartment, undergoes natural post-treatment and enter the soil. Such a cesspool requires the services of wastewater far less than usual, while the likelihood of soil contamination with sewage is significantly reduced.

A few words about concrete rings

Typical concrete rings for a cesspool are also convenient in that you can easily calculate the volume of a future septic tank by multiplying the circumference of the ring by its height. The first digit indicated when marking a concrete product means the diameter of the ring in decimetres, and the second indicates its height.

For example:

• KS-10.9 is a ring with a diameter of 1 meter and a height of 90 cm. Its volume is 0.71 cubic meters. m .;
• KS-15.9 is a ring with a diameter of 1.5 meters and a height of 90 cm. Its volume is 1.59 cubic meters. m .;

KS-20.9 is a ring with a diameter of 2 meters and a height of 90 cm. Its volume is 2.83 cubic meters. m

Holes for sewer pipes in a concrete ring can be made with a perforator

In addition to concrete rings, a ceiling should be purchased, since the cesspool must be securely closed.For a two-chamber septic tank, two overlaps will be required. In their manufacture, a round hole is made to provide access for cleaning. Cover the hole with a special hatch, which should also be purchased.

Installation work

Before starting construction work, you should draw up a detailed plan and choose a suitable location. In addition to the desire to preserve the aesthetic appearance of the landscape, it should be noted that the cesspool should be located:

• no less than five meters from the apartment building;
• not less than 30 meters from the source of drinking water;
• in a place accessible for entry of special transport of trash trucks.

Please note: When choosing a suitable place for a cesspool, you should take into account not only the location of your own house, well or well, you must ensure that the sewage system is at a sufficient distance from neighboring buildings and structures.

To make a two-chamber cesspool of concrete rings, you must:

• Dig two pits in a suitable place (sometimes one spacious pit is enough).
• Concrete the bottom of the pit in which the sump will be constructed. After drying in the concrete, cracks almost inevitably form, which must be repaired to ensure sufficient tightness. This step will take about a week or a little longer.

Tip: To avoid concreting the bottom of the pit, you should buy a concrete ring in which the bottom is already arranged.

• Install concrete rings in the pit.

To carefully grout the joints and waterproof the structure, for example, using cement mortar and water glass, bitumen, etc.

Concrete rings should be lowered into the pit so as not to damage the structure.

The joints of concrete rings must be carefully sealed and treated with a layer of waterproofing

• Install concrete rings to the bottom of the second foundation pit.
• Lay a drainage layer at the bottom: crushed stone, broken brick, etc.
• Lay sewer pipes that are connected to the house, as well as connecting the sections of the cesspool to each other.

Tip: The slope under which sewer pipes are laid should be approximately 2-3%, and the depth of the trench should be at least 80 cm to prevent freezing of the structure in winter.

• Carry out a leak test of the structure, correct the identified deficiencies.
• Install floors with a hatch and a ventilation hole above each compartment of the cesspool.
• Backfill the structure with soil.

A cesspool of this type is much more convenient than usual, the increased costs of its construction will soon pay off.