Preliminary media screening for application in the removal of clofibric acid, carbamazepine and ibuprofen by SSF-constructed wetlands

Dordio, Ana V.; Candeias, António; Pinto, Ana Paula; Costa, Cristina; Carvalho, A.J. Palace

doi:10.1016/j.ecoleng.2008.02.014

Cited by 100 publications

(58 citation statements)

References 63 publications

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“…This convergence of the pH values suggests that this material has some pH-buffering capacity which may be due to the presence of alkaline components in its composition, such as oxides and carbonates (e.g. traces of calcite) as has been determined in previous characterizations of the material (Dordio et al, 2007(Dordio et al, , 2009a. Its composition may, thus, yield a buffering power close to neutrality, thereby providing a protective barrier for plants and microorganisms.…”

Section: Influence Of Leca In Wastewater Ph Within the Bedsmentioning

confidence: 60%

“…Prior to use, gravel and LECA were washed several times with Millipore water in order to remove fine particles and suspended solids, and finally air dried. Physical and chemical characterization of this batch of LECA employed in the present assays was conducted in a previous study (Dordio et al, 2009a).…”

Section: Reagents and Materialsmentioning

confidence: 99%

“…Previous studies have demonstrated that LECA exhibits a high sorption capacity for some organic pollutants including MCPA (Dordio et al, 2007(Dordio et al, , 2009a(Dordio et al, , 2009bCalheiros et al, 2008). Sorption processes may be of major importance to achieve an efficient treatment of wastewaters, in particular in the case of hardly biodegradable organics, in which case the materials composing the support matrix may have a very relevant role.…”

Section: Mcpa Removal Efficiencymentioning

confidence: 99%

“…As LECA is a clay material, it contains many amphoteric constituents that can influence the pH of the wastewater within the beds (Dordio et al, 2007(Dordio et al, , 2009a. In order to assess the pH-control capabilities of LECA, non-diluted raw wastewaters (or aqueous solution of MCPA, 5 μg mL −1 , initial pH = 5.8) were placed in contact with LECA and the value of pH was measured in liquid samples.…”

Section: Influence Of Leca In Wastewater Ph Within the Bedsmentioning

confidence: 99%

“…A suitable choice of the latter is especially important for the removal of non-biodegradable compounds (including phenolic compounds, pharmaceuticals and pesticides) where sorption processes can play the major role in the wastewater treatment (Reddy and DeLaune, 2008;Imfeld et al, 2009;Ahmad et al, 2010;Passeport et al, 2011). In previous studies, light expanded clay aggregate (LECA) materials have been proven adequate for the development of plants and microorganisms in CWs and showed a high capacity to sorb many types of organic molecules (Dordio et al, 2007(Dordio et al, , 2009a(Dordio et al, , 2010Calheiros et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Constructed wetlands with light expanded clay aggregates for agricultural wastewater treatment

Dordio

Carvalho

2013

Science of The Total Environment

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. H I G H L I G H T S• CW with LECA substrate and Phragmites plants tested with agricultural wastewaters.• High removals of TSS, COD, NH 4 -N, polyphenols, a pharmaceutical and a pesticide.• Contact time of wastewaters with beds ranged from 3 to 9days in batch conditions.• Promising results suggest more studies in full-scale and more realistic conditions. Constructed wetlands (CWs) are receiving a renewed attention as a viable phytotechnology for treating agricultural wastewaters and for the removal of more specific pollutants, in particular recalcitrant ones. In this work, the performance of CW mesocosms using light expanded clay aggregates (LECA) as the bed's substrate and planted with Phragmites australis was investigated for treatment of olive mill wastewater (OMW), swine wastewater (SW) contaminated with oxytetracycline and water contaminated with herbicide MCPA (2-methyl-4-chlorophenoxyacetic acid). Both wastewaters (OMW and SW) initially presented high organic matter content and total suspended solids which were removed by the system with efficiencies higher than 80%. Removal of polyphenols in OMW and nitrogen compounds in SW also showed similar or higher efficiencies in comparison with other treatment systems reported in the literature. The antibiotic oxytetracycline was completely removed from SW within the assay period in unplanted LECA beds, but planted beds allowed a significantly faster removal. In regard to water contaminated with MCPA, the results showed that LECA has a large sorption capacity for this herbicide (removal efficiencies of 56-97%). In general, considerably higher pollutant removal efficiencies were obtained when plants were used (up to 28% higher). The results obtained are indicative that CWs with LECA as substrate may be an adequate option for agricultural wastewater treatment. a b s t r a c t a r t i c l e i n f o

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Section: Influence Of Leca In Wastewater Ph Within the Bedsmentioning

confidence: 60%

Section: Reagents and Materialsmentioning

confidence: 99%