Collection of Residential Shower and Bathtub Gray Water for Reuse to Flush Toilets and for...
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Transcript of Collection of Residential Shower and Bathtub Gray Water for Reuse to Flush Toilets and for...
Collection of Residential Shower and Bathtub
Gray Water for Reuse to Flush Toilets
and for IrrigationAn Experimental Project
Kenneth Garges
Gray Water
• Collected from bathtub and shower drains.
• NOT potable.
• Quickly fouls if stored.
• Fresh gray water can be used for subsurface irrigation but not sprayed.
• Not pure enough for toilets.
Filtering Gray Water
• Commercial systems are very expensive.
• Example: Flowtender price $3840 - $18,968
A New Simpler System• Collection in recycled 55 gallon drums.
• Spun polypropylene mesh pre-filter.
• Slow sand (aka biosand) filter modeled after Center for Affordable Water and Sanitation Technology (CAWST), a non-profit delivering water treatment systems to developing countries.
• Pump controlled by Arduino to keep storage brief by draining stale gray water.
Current Project Status• Collection tank plumbed to shower drains
• Filtration tank completed, running for 20 days (CAWST recommends at least 30 before using filtered water)
• Filtered water storage tank completed but not plumbed to building toilets
• Controller hardware finished
• Software still in progress