Grey Water Treatment

Published on by in Technology

Hello Everyone, 

Could anybody ​​provide advice ​on what is ​the best method ​to recycle grey water (Sink, Wash room) ​back to the ​toilet flushing ​& gardening. ​

much appreciated

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4 Answers

  1. Look up regulations for recycled water in your area. At home, I recycle rainwater and laundry water directly by filling a reservoir, adding a shot of bleach, then pumping the water to a basement toilet automatically with each flush. It's an experimental system I've used for 5 years as a way to reduce stormwater and wastewater inputs. Have not had issues with grime building up in toilet tank and water in toilet is a light yellow color at most. There might be concerns about splashing of recycled water onto bottom during defecation, but at least the bleach helps. This is a personal system that could be easily adapted to only urinals. As for gardening, plants will benefit from non-chlorinated recycled rain water as laundry water will clog soil if not pre-filtered.

  2. the best way is MBR but more expensive than other solutions like biofilter, sand / carbon filter .... 

  3. all just treated wastewater contains fecal matter that will contaminate the water net, so there's no any official serious standard allowing contaminated water into potable net.

    Any water supplied to the water net for human use must be potable when there is responsibility for human health and serious engineering.

    I your interest is to have a reliable as affordable wastewater re-purification technology, I suggest our WWPS technology.

  4. i was involved with development of a recycled water program at 2 new Las Vegas mega-casino projects in hopes of re-use if for the same purposes. Our first step was to test multiple waste water samples from a similar site at various times of the day and with different hotel occupancy levels. This determined the estimated average hourly volume of waste water and factored in seasonal changes due to the A/C cooling towers discharge. We also talked with a botanist regarding the acceptability of this water quality for sustaining plants. We initially found that the water could be remediated for toilets except that State regulations however prevented any use of any gray water in toilets at that time (1988).  In addition, cooling tower discharge to the casino waste water greatly increased dissolved solids (TDS) which our botanists stated made it unacceptable for plant irrigation unless it was pre-treated using expensive reverse osmosis equipment.  Hopefully this might help you in moving forward.