Wastewater Treatment by Floating Macrophytes (Salvinia Natans) Under Algerian Semi-Arid Climate

Year 2019, Volume: 3 Issue: 1, 103 - 110, 27.06.2019

Laabassi Ayache , Boudehane Asma

Abstract

Macrophyte
pond has developed strongly in the field of wastewater treatment for irrigation
in rural areas and small communities. Their association allows, in some cases,
to increase the hydraulic capacity while maintaining the highest level of
quality.

The present
work is devoted to the treatment of domestic wastewater under climatic
conditions of Algeria (semi-arid) through a system using two tanks planted with
Salvinia natans.

The performance study and
treatment efficiency of the system overall shows that the latter provides a
significant removal of nitrogen pollution: total Kjeldahl nitrogen NTK (85.2%),
Ammonium NH₄⁺-N (79%), Nitrite NO₂^--N
(40%) also, a major meaningful reduction of biochemical oxygen demand BOD₅
was observed at the output of the system (96.9 %). As BOD₅, the
chemical oxygen demand (COD) removal was higher than 95 % at the exit of the
two tanks. A moderately low yield of phosphate-phosphorus (PO₄³-P)
was achieved with values not exceeding 37 %. In general, the quality of treated
effluent meets the Algerian standard of discharge and which allows us to select
a suitable species in constructed wetland treatment systems under semi-arid
climate.

Keywords

Nutrient removal, Salvinia natans, semi-arid climate

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