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Advisor(s)
Abstract(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.
Description
Keywords
Typha latifolia Saline wastewater Constructed wetland Aquaculture
Pedagogical Context
Citation
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
Publisher
Taylor & Francis