Rainwater-utilisation system

摘要

The rainwater-utilisation system has the task of utilising rainwater collected from the roof surface of the hose for a number of purposes. The rainwater is collected in an underground tank (protected from sun rays due to the formation of algae). Said underground tank may consist of plastic or precast concrete compound units. It should have a capacity of at least 10 cubic metres. The rainwater collected is kept on standby by means of an HWA (5) at each tapping point at a constant pressure and without being subjected to waiting times. The rainwater flows through a number of cleaning stages, acid rain caused by the environment has no influence on use for washing and cleaning purposes. The alkaline detergents neutralise the acid rain. By virtue of the installation of the rainwater-utilisation system, 54% of valuable drinking water is saved. This 54% is made up of 35% for WC-flushing, 11% for washing laundry (washing machine), 4% for watering gardens, supplying water to ponds, 2% for washing cars, and 2% for cleaning. Furthermore, the clarification installations are relieved (less phosphate in the waste water). In the case of heavy rainfall, a multiplicity of such installations act in the same way as a stormwater retention tank and relieve the drainage systems and the clarification installations. The drinking-water reservoirs are spared and preserved for the future. This system is invented principally for the private user and should be used in this sector.