Blackwater (waste)

Black water is in the water sector in accordance with ISO 6107-7:1997 Domestic sewage not gray water with fecal solids.

Accordingly, the waste water from toilets is called black water. The terms of black and gray water were introduced to designate different possible water circuits in buildings. Several projects are underway in order to separately collect this waste water, each containing different impurities and remanufacture in the building itself, or at the level of the settlement. Here, the black water is in part, if a urine separation is carried out with urine diversion toilets, further divided into yellow and brown water.

Substreams

Yellow Water

Yellow Water is the collective name for urine and urine with rinse water and a part of the black water. Especially for sustainable sanitation concepts differentiation of different waste water streams plays a role. Pure yellow water, by separating toilets that separate urine and faeces, or urinals with or without irrigation are obtained. Due to the high nutrient content of urine yellow water can be diluted to be used directly as fertilizer or made into struvite.

Brown water

Brown water falls in separation toilets as waste water stream. It is the part that contains only faeces, Spülwassser and toilet paper. After the dewatering brown water may be used for composting.