Understanding the Fundamental Distinctions between Graywater and Blackwater in USGBC LEED Green Associate Certification
In the pursuit of water efficiency in LEED (Leadership in Energy and Environmental Design) projects, it's crucial to understand the distinction between graywater and blackwater.
Graywater, a term used to describe wastewater from sources such as lavatory faucets, sinks, showers, bathtubs, and washing machines, can potentially be reused for non-potable purposes like landscape irrigation or toilet flushing with proper treatment. It should, however, not be used for human consumption even with treatment.
On the other hand, blackwater is waste water from toilets and urinals, containing fecal matter and urine. Due to its high levels of pathogens, organic matter, and contaminants, blackwater requires more advanced treatment before reuse or disposal.
It's essential to note that graywater and blackwater are separate from stormwater and potable/drinking water. Stormwater is runoff from precipitation, while potable water is treated to drinking water standards.
Graywater has been used for non-potable purposes like washing hands, dishes, irrigation, or toilet flushing, but does not contain human or animal waste. This makes it a valuable resource for water efficiency in LEED projects, where strategies such as using non-potable water for sewage conveyance can be employed.
In contrast, the intensive treatment required for blackwater before reuse or disposal makes it less suitable for such purposes. Instead, it is typically directed to sewage systems for treatment at wastewater treatment plants.
In conclusion, understanding the difference between graywater and blackwater is key to implementing effective water efficiency and reuse strategies in LEED projects. While graywater can be a valuable resource for non-potable uses, blackwater requires more extensive treatment before reuse or disposal.
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