Rainwater

RAINWATER TREATMENT SYSTEMS

The collection and reuse of rainwater in order to limit the use of tap water, is a technique that in its simplified form was used extensively in the past in many fields of the special area.

Modern rainwater treatment systems allow not only the treatment but also the storage of rainwater in accordance with all sanitary and plumbing safety conditions, ensuring not only great economic benefits to the user but also environmental benefits, since the collection of rainwater combined with recycling techniques reduces the rate of use of water resources, increases soil moisture levels, improves the quality of the aquifer and reduces flooding.

The general principle of the system is based on the collection of rainwater from the roof through a suitably designed gutter system which receives and removes water. The amount of water that will be collected, after first being filtered, is concentrated in a storage tank which, depending on the requirements, is available in different sizes and materials. An important factor is the correct dimensioning of the storage tank volume, which depends on the annual rainfall intensity, the available collection area (roof area) and the runoff coefficient according to the following equation:

Annual rainwater supply (λ) = rainfall (mm/year) x surface (sq.m.) x runoff rate

Runoff rate surface material
Grass	Cobblestone	Cement
0,40	0.65	0.75 - 0.9

Our company offers a wide range of rainwater treatment systems, such as domestic, garden and larger scale commercial systems. Dimensioning is always based on the respective water requirements they need to serve. In general, the installation and operation of such systems must be in line with local legislation. Treated, soft, descaled rainwater can be used in cases where high quality drinking water is not required, such as in toilet flushes, washing machines, garden watering, car wash and industrial applications such as cooling towers, fire stations, HVAC etc. The use of drinking water in such applications is not necessary, therefore the reuse of rainwater is presented as a strategic solution.

Reusing rainwater for minor uses such as watering and washing floors does not require any additional physicochemical treatment. However, when water is used for toilet flushes, the minimum water quality set by the forthcoming legislation must be ensured. After the rainwater, decontamination systems such as chlorine, UV etc. can be used. If the chlorine decontamination solution is selected, free chlorine concentration of between 0.2 and 0.6 mg/lt is recommended. In the case of the washing machine, no special treatment is required when the washing water reaches temperatures higher than 55 oC. In the case of industrial applications, the need for post-processing is examined on a case-by-case basis.

Enflow offers a wide range of products and accessories ideal for any application.
· Systems for above ground installation with pre-filter
· Systems for underground installation with pre-filter
· Systems for underground installation with self-cleaning filter