Depends on the country you ...
Published by John Salonich, Vice President / Managing Director
Depends on the country you are in and local regulations, but factors include depth of the aquifer or groundwater, perk rate, structure (materials) of the vadose zone for filtering and beneficial bacteria growth. Constructed wetlands can take secondary treated wastewater to polish to tertiary quality then inject into ground for recharge using a low energy alternative for tertiary quality.