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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Constructed Wetland for Treating Effluent from Subtropical Aquaculture Farm

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Author(s):
Travaini-Lima, Fernanda [1] ; Mesquita Silva da Veiga, Marcia Andreia [2] ; Sipauba-Tavares, Lucia Helena [1]
Total Authors: 3
Affiliation:
[1] Sao Paulo State Univ UNESP, Aquaculture Ctr, BR-14884900 Jaboticabal, SP - Brazil
[2] Univ Sao Paulo, Dept Chem, Fac Philosophy Sci & Letters Ribeirao Preto, BR-14040904 Ribeirao Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: WATER AIR AND SOIL POLLUTION; v. 226, n. 3 MAR 2015.
Web of Science Citations: 2
Abstract

A free water surface flow constructed wetland (CW) was designed to evaluate the capacity of this biological treatment system, which receives wastewater from aquaculture and upflow anaerobic sludge blanket (UASB) reactors, to retain heavy metal. The purpose of this study was to determine the role of the sediment and the macrophytes Cyperus giganteus, Typha domingensis, Eichhornia crassipes, and Pontederia cordata in accumulating Al, Cd, Cr, Cu, Fe, Ni, Mn, Pb, and Zn, during the dry (winter) and rainy (summer) seasons. In general, the concentrations and mass loading of heavy metals in the outlet water were lower than in the inlet water. The highest removal efficiency rates of water (mainly mass removal) occurred in the dry season. In the rainy season, the probable low oxygen level in the upper layer of sediment resulted in a release of reduced metals into the water because of organic matter mineralization and an increase in depth. This, coupled with an increase in the hydraulic loading rate (HLR), affected the efficiency removal in this season. The metals were especially immobilized as a result of the sedimentation process and could be removed weakly via macrophyte uptake, with the exception of Mn. In addition to the sediment, which is the main compartment for heavy metal retention in the CW system, the macrophytes have the advantage of being harvested. Therefore, E. crassipes and T. domingensis, which are good metal accumulators, can be recommended for the removal of heavy metals from agricultural wastewaters. (AU)

FAPESP's process: 10/50478-6 - Retention capacity and dynamics of a wetland built for waste water treatment
Grantee:Lúcia Helena Sipaúba Tavares
Support Opportunities: Regular Research Grants