| 摘要 |
<p>A method to recycle grey water in situ by using the roof space on urban blocks of flats to maximum advantage. Used wash water (grey water) is collected from domestic baths, basins and showers in the block to a sump, is filtered and pumped to the roof where it is allowed to trickle through root zone of a native plant sward 2 as a cleansing medium. The water enters the system by filtered grey water inlet 5 and passes through a series of descending, parallel, waterproofing channels in which the plants are rooted. The channels being laid across the width of the roof. During passage through the channels the water may encounter a number of physical barriers or weirs 7 to ensure maximum exposure to the medium. A waterproof membrane 1 may be secured to the upper surface of the channelled area, through which the plants are inserted so that the roots are below the membrane, while the foliage remains above. This membrane forms a barrier against the infiltration by the majority of ambient rainwater, which is collected in a gutter 3 at the lower edge of the roof, which is filtered and blended with the treated grey water, and re-supplied as a disinfected resource for the flushing of toilets and the subsurface irrigation of gardens and green spaces. Solar panels 4 may be used to power the pumps.</p> |
