Light-greywater typically consists of drainage from bathroom sinks, tubs, showers, and often laundry. All three wastewater categories contain a wide range of organic and inorganic contaminants as well as disease-causing micro-organisms; with the type of contaminants and concentrations in light-greywater depending on the specific drainage source (i.e. bathtubs versus laundry). Although light-greywater may have lower concentrations of contaminants than mixed wastewater, research shows that the concentrations can be comparable to, and at times even greater than, mixed wastewater. Most lightgreywater is expected to have a low enough concentration of contaminants and disease causing microorganisms that reuse applications can be considered without the need for biological treatment or disinfection as long as the application has a is low risk of direct public contact (e.g. subsurface irrigation, and toilet or urinal flushing), and when storage is not required. The only form of greywater treatment typically provided in these cases is sedimentation to remove coarse solids and grit, and coarse filtration to remove hair and lint.
Collection of the greywater is simple in concept, but is one of the more practically difficult aspects of reusing greywater. In the simplest case, greywater can be collected simply by placing a bucket below an open sink drain, and manually transported to the point of use. However, a piped system requires less user intervention and is more ideal from a public health perspective since it eliminates contact between greywater and user. In this case, a plumbing network simply takes the greywater, keeping it separate from the non-greywater, and directs the greywater to a point where it can be stored, treated, or reused.
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-CHRIS>C
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