The Foundation in its many giant strides is funding the development of reinvention treatment of sewage under a Project called Omniprocessor - a brainchild of a Seattle based engineering firm Janicki Bioenergy. The Omniprocessor converts human faeces to drinkable water. The good news now is that the machine in now producing the expected product and the man himself - Bill Gates was there to drink the water.
The Omniprocessor project piloting is later this year in Dakar, Senegal. Kudos to Mr. Gates