FEASIBILITY OF TYPHA LATIFOLIA FOR HIGH SALINITY EFFLUENT TREATMENT IN CONSTRUCTED WETLANDS FOR INTEGRATION IN RESOURCE MANAGEMENT SYSTEMS

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Jesus, JM (Author) Other; Calheiros, CSC (Author) Other; Castro, PML (Author) Other; Borges, MT (Author) FCUP

Journal

Title: International Journal of Phytoremediation

Vol. 16

Pages: 334-346

ISSN: 1522-6514

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 18 Citations

Scopus - 20 Citations

Scientific classification

FOS: Natural sciences > Earth and related Environmental sciences

Other information

Authenticus ID: P-006-HRV

DOI: 10.1080/15226514.2013.773284

Abstract (EN): 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 substrates were tested for nutrient adsorption, of which expanded clay performed better. This substrate adsorbed 0.31mg kg(-1) of NH4 (+)-N and 5.60mg kg(-1) of PO4 (3-)-P and 6.9mg kg(-1) dissolved salts after 7days of contact. Microcosms with Typha latifolia planted in expanded clay and irrigated with aquaculture wastewater (salinity 2.4%, 7days hydraulic retention time, for 4 weeks), were able to remove 94% NH4 (+)-N (inlet 0.25 +/- 0.13mg L-1), 78% NO2 (-)-N (inlet 0.78 +/- 0.62mg L-1), 46% NO3 (-)-N (inlet 18.83 +/- 8.93mg L-1) whereas PO4 (3-)-P was not detected (inlet 1.41 +/- 0.21mg 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13