Abstract
The study was carried out to evaluate six different hydrophytes which were tested associated by twos: 1) Lemna gibba and Ceratophyllum demersum, 2) Berula erecta and Lemna gibba, 3) Polygonum punctatum and Hydrocotyle ranunculoides, and 4) Polygonum punctatum and Azolla filiculoides, for the purpose of removing nitrate from the water of Reyes Aztecas Lake, which is located southeast of Mexico City in Tláhuac District, Mexico D.F. The average of removal efficiency was obtained in relation to the different hydrophytes associations based on five sampling stations. The statistical analysis revealed that there were no significant differences among hydrophytes, all show remarkable ability to remove nitrate in water.
Highlights
The Reyes Aztecas lake is located southeast of Mexico City, in Tláhuac District, (D.F.)
Three hydrophytes were used for the removal of nitrates from domestic waste waters obtaining the following results: Eichhornia crassipes, had an efficiency rate of 15.38%, Lemna gibba 31.25% and Azolla filiculoides 22.22% [12]
In another research is working with three aquatic plants: Eichhornia crassipes, Pistia stratiotes and Lemna gibba, for the removal of nitrates from waste water supplied by a waste digester fed by excrements from bovine cattle, obtaining the following results: an efficiency rate of 70%, 73% and 99% respectively [13]
Summary
The Reyes Aztecas lake is located southeast of Mexico City, in Tláhuac District, (D.F.). The rise of biological research related with water treatments using hydrophytes has opened a vast field filled with hope due to its low cost and simple infrastructure [5] Their prominent ability of nutrient assimilation and the creation of favorable conditions for the decomposition of organic matter are widely known [6]-[9]. Three hydrophytes were used for the removal of nitrates from domestic waste waters obtaining the following results: Eichhornia crassipes, had an efficiency rate of 15.38%, Lemna gibba 31.25% and Azolla filiculoides 22.22% [12]. In another research is working with three aquatic plants: Eichhornia crassipes, Pistia stratiotes and Lemna gibba, for the removal of nitrates from waste water supplied by a waste digester fed by excrements from bovine cattle, obtaining the following results: an efficiency rate of 70%, 73% and 99% respectively [13]. The objective of this study is to prove the efficiency to remove nitrates from water with six different hydrophytes associated by twos, at five different stations of the Los Reyes Aztecas lake in Tláhuac District
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