Constructed wetlands for tertiary treatment



CW plants are effectively used as tertiary treatment after traditional plants with activated sludge, in case of user increments or more stringent discharge limits.

Generally the tertiary treatments with natural techniques are utilized for completing the purification (in particular the denitrification) and the final disinfection; in some cases it can also be a standby contingency solution  of existing purifiers that don’t comply with the legal limits due to increased loads to be treated or seasonal changes , or as filter ecosystems in areas of high quality before final discharge, providing the opportunities to increase the ecological value and to improve the landscape and urbanization of the purifiers.

 

 

Advantages:

  • excellent efficiency, reduction of organic load, nutrients, bacterial load
  • simple construction and operation
  • Easy maintenance
  • Lower construction costs compared with traditional systems for small and medium users
  • practically no management costs compared to traditional systems (almost zero energy consumption)
  • landscape insertion
  • Odor, insect proliferation and aerosols control and absence
  • no use of chemicals
  • doesn’t required skilled labor for management