Spatial variations of temperature, redox potential, and contaminants in horizontal flow reed beds

García, Jesús Miguel Bairán; Ojeda, Esther; Sales, Enric; Chico, Fran; Pı́riz, Toni; Aguirre, Paula; Mujeriego, Rafael

doi:10.1016/j.ecoleng.2003.10.001

Cited by 74 publications

(51 citation statements)

References 12 publications

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“…Shallower wetlands appear to have higher redox potential and thus promote more variate and energetically favorable reactions, which in turn enhance the degradation of PPCPs . Other authors have shown experimental evidence, which support this hypothesis (García et al, 2003aHeadley and Davison, 2005;Huang et al, 2005;Matamoros and Bayona, 2006).…”

Section: Design and Operational Factors Affecting The Removal Of Pharsupporting

confidence: 75%

Pharmaceuticals and Personal Care Products (PPCPs) in the Environment and Their Removal from Wastewater through Constructed Wetlands

Ávila

García

2015

Persistent Organic Pollutants (POPs): Analytical Techniques, Environmental Fate and Biological Effects

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Section: Design and Operational Factors Affecting The Removal Of Pharsupporting

confidence: 75%

Pharmaceuticals and Personal Care Products (PPCPs) in the Environment and Their Removal from Wastewater through Constructed Wetlands

Ávila

García

2015

Persistent Organic Pollutants (POPs): Analytical Techniques, Environmental Fate and Biological Effects

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“…In SSF CW organic matter is removed by means of physical, chemical and biological processes that occur naturally and simultaneously within the treatment bed. Although subsurface constructed wetlands are systems subjected to great spatial redox variations (especially in depth) (García et al 2003) they are considered to be mainly anaerobic (Baptista, 2003) and, therefore, methane emission takes place during the wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of primary treatment and organic loading on methane emissions from horizontal subsurface flow constructed wetlands treating urban wastewater

Corbella

Puigagut

2015

Ecological Engineering

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Methane is emitted in horizontal subsurface flow constructed wetlands (SSF CW) during wastewater treatment. The objective of this work was to determine the influence of primary treatment and organic loading rate on methane emissions from constructed wetlands. To this aim methane emissions from a SSF CW pilot plant were measured using the closed chamber method. The effect of primary treatment was addressed by comparing emissions from wetlands operated either with an anaerobic (HUSB reactor) and with or a conventional settler as primary treatments. Alternatively, the effect of organic loading was addressed by comparing emissions from wetlands operated under high organic loading (52 g COD.m -2 .day -1 ) and low organic loading (17 g COD.m -2 .day -1 ). Results suggest that SSF CW redox status at the middle part of the treatment bed (15 cm depth) is of high reduced nature, regardless the type of primary treatment or organic loading applied. However, redox conditions on the upper part of the wetlands (5 cm depth) are especially affected by the type of primary treatment implemented. Accordingly, significantly lower redox conditions at 5 cm depth in wetlands receiving HUSB effluents are recorded which, in turn, resulted in significant lower organic matter removal efficiencies. Moreover, methane emission rates are affected by the type of primary treatment and, to a lesser extent, by the organic loading applied. Accordingly, a wetland fed with the effluent of a HUSB line were up to 14 times higher than those of the wetland fed with primary settled wastewater. Moreover, systems subjected to three times higher organic loading than that recommended lead to higher metheane emission rates, although high data variability resulted in no statistically significant differences.

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“…As a consequence, a slight increase of its concentration was observed in the VSSF CW 1. At the same time, the N-NH 4 + was being nitrified, increasing the N-NO 3 -concentration considerably. The entire formed N-NO 3 -was removed in the HSSF CW by denitrification, which was the only mechanism that eliminated TN from the CW.…”

Section: Resultsmentioning

confidence: 93%

“…Eqn (8) is used to calculate N-NO 3 -concentration considering that there is no volatilization of N-NH 4 + , assuming low temperature and pH values [1]. The used parameter values were given by Vymazal et al [9] for VSSF CW, and, for HSSF CW, were calculated by Mena [19].…”

Section: Mathematical Modelmentioning

confidence: 99%

Design of horizontal and vertical subsurface flow constructed wetlands treating industrial wastewater

Mena

Rodríguez

Núñez

et al. 2008

WIT Transactions on Ecology and the Environment

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Constructed wetlands have become a good alternative to urban and industrial wastewater treatments. Because of the many interactions between the different parts that form the wetland, the design of these systems used to be very complex so a good design tool is required. Hybrid constructed wetlands mix the aerobic and anaerobic properties of vertical and horizontal subsurface flow constructed wetlands to improve COD, phosphorous and, especially nitrogen removal. A simulation of the concentration profiles of these compounds into a hybrid system constituted by four vertical flow constructed wetlands and a horizontal flow one with the K-C* model was achieved when the system treated an urban and a winery wastewater, respectively. Maximum limits of the flow rate to achieve the legislation limits of the different pollutants were calculated. Winery wastewater treatment required lower flow rates because of its higher organic loading. Because constructed wetlands had limited capacity to remove phosphorous, it was the most restrictive pollutant, requiring a lower flow rate.

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Spatial variations of temperature, redox potential, and contaminants in horizontal flow reed beds

Cited by 74 publications

References 12 publications

Pharmaceuticals and Personal Care Products (PPCPs) in the Environment and Their Removal from Wastewater through Constructed Wetlands

Pharmaceuticals and Personal Care Products (PPCPs) in the Environment and Their Removal from Wastewater through Constructed Wetlands

Effect of primary treatment and organic loading on methane emissions from horizontal subsurface flow constructed wetlands treating urban wastewater

Design of horizontal and vertical subsurface flow constructed wetlands treating industrial wastewater

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