Home House & Building Reduce, Reuse & Save Recycling of Greywater - With Purification
Recycling of Greywater - With Purification
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Recycling of Greywater
Greywater recycling systems
Without purification
With Purification


Water recycling with purification

For filtering the water to become potable (or near-potable), there are numerous systems based on "soft" processes. These include natural biological principles such as

  • mechanical systems (sand filtration, lava filter systems and systems based on UV-radiation)
  • biological systems (plant systems as treatment ponds, constructed wetlands, living walls) and compact systems as activated sludge systems, biorotors, aerobic and anaerobic biofilters, submerged aerated filters, biorolls

Finally, also used for creating potable (or near-potable) water are the "hard", direct processes, such as distillation (evaporation) which need not necessarily be as energy intensive as they might initially appear. There seem to be no commercially available "hard" greywater recovery devices suitable for on-site use in the individual household, even though a number of such technologies exist.

In order to purify the water adequately, several of these systems are usually combined to work as a whole. Combination of the systems is done in 2 to 3 stages, knowingly a primary and a secondary purification. Sometimes a tertiary purification is also added.

Some municipal sewerage systems recycle a certain amount of grey and black waters using a high standard of treatment, thus providing reclaimed water for irrigation and other uses