ABSTRACT
The three elemental components of Constructed Wetlands (CW) are microorganisms, filter media, and vegetation. This chapter analyzes the water problems in the State of Veracruz and present three experiences of treatment performance and one experience of greenhouse gas emissions in CWs with ornamental plants to mitigate water pollution, under tropical and subtropical conditions in the State of Veracruz, Mexico. CWs for one single family residence wastewater treatment, CWs for student dormitories wastewater treatment, and CWs for communities' wastewater treatment. Methane and nitrous oxide emissions were measured in the pilot scale treatment wetland in Pinoltepec, Emiliano Zapata, Veracruz, using the closed chamber method. Water samples were taken from influent and effluent of each cell every other week, from June to October 2013 in Emiliano Zapata, from June to November 2016 in Xalapa, and from October 2015 to February 2016 in Actopan.
