Sub-projects in Chabalisa
The wastewater treatment plant
currently in progress
In order to treat the waste water from the house and in future also from the school on site, we have planned a multi-stage system for waste water treatment. It consists of an underground pre-clarifier made of reinforced concrete with a total of four chambers, as well as a plant-based sewage treatment plant and a storage cistern for the treated wastewater. The natural gradient on the site makes the use of waste water pumps in the entire system superfluous.

A special feature of the system is the aeration pump in the pre-clarifier, which enables aerobic degradation processes in the wastewater by supplying oxygen. The pump is supplied with energy by the planned solar power supply and is operated during the day during the hours of sunshine. Such an operation creates a change between oxygen-poor and oxygen-rich conditions in the wastewater, at the same time the storage capacity of the batteries is protected. Possible odor nuisance, which is already reduced by the aeration pump, is additionally prevented by installing activated carbon filters on the aeration valves of the primary clarifier.
The downstream wastewater treatment plant corresponds to the concept of a "Horizontal Subsurface Flow Constructed Wetlands" and removes a large part of the pathogenic germs from the pre-cleaned water. The sewage treatment plant is sealed at the bottom and attached to the sides by a small wall, so that the wastewater cannot leave the system uncontrolled. The cleaned wastewater is then sent from the plant treatment plant to a storage cistern, from which it can be removed for irrigation of the fields and the garden.