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Orientador(es)
Resumo(s)
High salinity wastewaters have limited treatment options due to the occurrence of salt
inhibition in conventional biological treatments. Using recirculating marine aquaculture
effluents as a case study, this work explored the use of Constructed Wetlands as a treatment
option for nutrient and salt loads reduction. Three different substrateswere tested for nutrient
adsorption, of which expanded clay performed better. This substrate adsorbed 0.31 mg kg−1
of NH4
+−N and 5.60 mg kg−1 of PO4
3−−P and 6.9 mg kg−1 dissolved salts after 7 days
of contact. Microcosms with Typha latifolia planted in expanded clay and irrigated with
aquaculture wastewater (salinity 2.4%, 7 days hydraulic retention time, for 4 weeks), were
able to remove 94%NH4
+−N(inlet 0.25±0.13 mg L−1), 78%NO2
−−N(inlet 0.78±0.62 mg
L−1), 46% NO3
−−N (inlet 18.83 ± 8.93 mg L−1) whereas PO4
3−−P was not detected (inlet
1.41 ± 0.21 mg L−1). Maximum salinity reductions of 52% were observed. Despite some
growth inhibition, plants remained viable, with 94% survival rate. Daily treatment dynamics
studies revealed rapid PO4
3−−P adsorption, unbalancing the N:P ratio and possibly affecting
plant development. An integrated treatment approach, coupled with biomass valorization, is
suggested to provide optimal resource management possibilities.
Descrição
Palavras-chave
Typha latifolia Saline wastewater Constructed wetland Aquaculture
Contexto Educativo
Citação
JESUS, J.M....[et al] - Feasibility of typha latifolia for high salinity effluent treatment in constructed wetlands for integration in resource management systems. International Journal of Phytoremediation. ISSN 1522-6514. Vol. 16 (2014), p. 334–346
Editora
Taylor & Francis