Facebook’s water reuse system

Facebook’s water reuse system comprises micro-screening with particulate material returned to the sewer, two stage (anaerobic/aerobic) membrane bioreactors that also achieve micro-filtration, and two-stage reverse osmosis, and UV disinfection with chloramine and mineral adjustment.  The system is designed for 16 million gallons/year for irrigation of roof top gardens and gathering spaces.   This is an example of distributed water reuse, which is gaining in popularity at large tech campuses and office buildings in California.  (August 30, 2019)