As
water scarcity and plumbing challenges continue to affect small
and rural communities, direct potable reuse has the potential to improve
household access to clean, potable water. A pilot household greywater
reuse system was built and operated daily for nine months to determine
whether high-quality water that was safe for human contact could be
produced consistently on site. Sixty gallons of water were produced
per day under normal and stress conditions, including a simulated
whole household illness when viruses were spiked into the system to
attempt to overwhelm the effectiveness of the treatment. The system
produced high-quality potable water for more than 2 weeks, requiring
the addition and removal of only 30 gal of outside water weekly for the household to have 420
gal of treated water available each week and meeting recommended virus
reduction standards for small and household-level direct potable reuse
systems. Wash water had a low level of total organic carbon, low turbidity,
and low conductivity, normal pH, and high ultraviolet transmittance.
The treatment process train provided >18 log10 reduction
of viruses and >8 log10 reduction of bacteria. While
the
system produced sufficient wash water to protect health, the concentrated
wastes produced could pose a threat to the household if proper waste
disposal methods are not facilitated.