ABSTRACT
The potential for greywater recycling and rainwater harvesting for both domestic residential and for various types of commercial building, considering the circumstances in which the systems offer benefits, both as stand-alone installations and combined. The other often complementary recycling approach is to collect and disinfect ‘greywater’ the waste water from baths, showers and washbasins. Recycled greywater may then be used for toilet and urinal flushing, for laundry and general cleaning, and for outdoor use such as vehicle washing and garden irrigation a substantial water saving for premises such as hotels. Rainwater can be integrated into a greywater scheme with very little added complication other than increased tank size with the exception of green roofs, where additional polishing may be required. Rainwater enters the drainage system through sealed gullies and passes through a pre-filter to remove leaves and other debris before passing into the collection tank.
