Since 2005, UNACEM began pilot tests to implement a Wastewater Treatment Plant (WWTP) using constructed wetlands. The WWTP started it built in 2009 and finished in 2010 (Fig. 1 and 2).
Currently, it operates a total flow of 600 m3 per day (6.94 L/s). The objective of the project is to collect and treat 100% of the company's domestic and industrial effluents, and reach a quality for reuse in irrigation; achieving the discharge in the sewer network.
The treatment system is integrated by:
The plant species used in the constructed wetlands, allowed to integrate the Wastewater Treatment Plant of with the local landscape (Fig. 3).
Two species were selected: Achira (Canna indica) and Paragüitas (Cyperus alternifolius) (Fig. 4 & 5), both has a fast growing and moderate development.
Currently, the effluent is used to irrigate parks and gardens and the fire system. Treatment efficiency is greater than 95%, reaching an average BOD below 10 mg/L. The energy required by the WWTP comes from the National Interconnected Electric System (SEIN), through a contract with the company “El Platanal”, which operates hydroelectric plants. The annual operating cost is 120 thousand dollars and the savings in water consumption exceed 110 thousand m3.
Location: UNACEM cement company
City:Villa María del Triunfo
Project Size:25000 m2
Wetland Type (System/Cells):
Horizontal subsurface flow / 6 cells of 30 m x 30 m each one and a depth of 0.6 m.