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Nitrogen Removal in a Partially Saturated Vertical Subsurface Flow Constructed Wetland Used for Restaurant Wastewater Treatment

2018; American Society of Civil Engineers; Volume: 144; Issue: 7 Linguagem: Inglês

10.1061/(asce)ee.1943-7870.0001384

1943-7870

Orlando de Carvalho, Marcos Vinicius Costa Rodrigues, Fernanda Martins Nonaka, Marcos Antônio Machioni,

Constructed Wetlands for Wastewater Treatment

The objective of this research was to evaluate the nitrogen removal efficiency of a partially saturated vertical subsurface flow constructed wetland (VSFCW) used on university restaurant (UR) effluent treatment. The research was conducted in southern Brazil (latitude:−23.304218; longitude:−51.172223) on constructed wetland with 1 m2 of surface area, and the saturation layer was 0.25 m upper bottom. The results of this monitoring research extended for 6 months in a cultivated Heliconia rostrata system. The average applied loads were 37.6 g/m2 of chemical oxygen demand (COD), 4.10 g/m2 of total Kjeldahl nitrogen (TKN), 1.74 g/m2 of ammoniacal nitrogen (N-NH4+), and 4.28 g/m2 of total nitrogen (TN). The mean efficiencies of removal/conversion were 95.34% for COD, 96.95% for TKN, 93.99% for N-NH4+, and 69.39% for TN. The removed loads were 35.9 g/m2 of COD, 3.98 g/m2 of TKN, 1.68 g/m2 of N-NH4+, and 3.02 g/m2 of TN. The results showed system operational stability and the high efficiency on organic matter and TN removal of this effluent type.