Attenuation of emerging organic contaminants in a hybrid constructed wetland system under different hydraulic loading rates and their associated toxicological effects in wastewater.

The capacity of a hybrid constructed wetland (CW) system consisting of two vertical flow (VF) CWs working alternatively (3m(2)), one horizontal flow (HF) CW (2m(2)) and one surface flow (FWS) CW (2m(2)) in series to eliminate 13 emerging organic contaminants (EOCs) under three different hydraulic loading rates (HLRs) (0.06, 0.13 and 0.18 m d(-1) considering the area of the two VF beds) was studied through a continuous injection experiment. General toxicity, dioxin-like activity, antimicrobial activity and estrogenicity were also measured under the highest hydraulic loading rate. The hybrid system was highly efficient on the removal of total injected EOCs (except for antibiotics, 43 ± 32%) at all three HLRs (87 ± 10%). The removal efficiency in the hybrid CW system showed to decrease as the HLR increased for most compounds. The VF wetlands removed most of the injected EOCs more efficiently than the other two CWs, which was attributable to the predominant aerobic degradation pathways of the VF beds (70 ± 21%). General toxicity was reduced up to 90% by the VF beds. Estrogenicity and dioxin-like activity were similarly reduced by the VF and the HF wetlands, whereas antimicrobial activity was mainly removed by the FWS wetland. Bearing this in mind, this injection study has demonstrated that the use of hybrid CW systems is a suitable wastewater technology for removing EOCs and toxicity even at high HLRs.

[1]  A. Zouboulis,et al.  TREATMENT PERFORMANCE VARIATION AT DIFFERENT DEPTHS WITHIN VERTICAL SUBSURFACE-FLOW EXPERIMENTAL WETLANDS FED WITH SIMULATED DOMESTIC SEWAGE , 2009 .

[2]  Dean A. Forbes,et al.  Estrogenic activity and steroid hormones in swine wastewater through a lagoon constructed-wetland system. , 2007, Environmental science & technology.

[3]  B. Tunçsiper,et al.  Nitrogen removal in a combined vertical and horizontal subsurface-flow constructed wetland system , 2009 .

[4]  Víctor Matamoros,et al.  Removal of Pharmaceutical Compounds from Wastewater and Surface Water by Natural Treatments , 2013 .

[5]  I. Škorić,et al.  Photolytic degradation of norfloxacin, enrofloxacin and ciprofloxacin in various aqueous media. , 2013, Chemosphere.

[6]  P Molle,et al.  Effect of reeds and feeding operations on hydraulic behaviour of vertical flow constructed wetlands under hydraulic overloads. , 2006, Water research.

[7]  J. Bayona,et al.  Emerging organic contaminant removal depending on primary treatment and operational strategy in horizontal subsurface flow constructed wetlands: influence of redox. , 2013, Water research.

[8]  J. Bayona,et al.  Evaluation of primary treatment and loading regimes in the removal of pharmaceuticals and personal care products from urban wastewaters by subsurface-flow constructed wetlands , 2011 .

[9]  R. Kookana,et al.  Biological degradation of triclocarban and triclosan in a soil under aerobic and anaerobic conditions and comparison with environmental fate modelling. , 2007, Environmental pollution.

[10]  Víctor Matamoros,et al.  Organic micropollutant removal in a full-scale surface flow constructed wetland fed with secondary effluent. , 2008, Water research.

[11]  C M Weedon,et al.  Compact vertical flow constructed wetland systems--first two years' performance. , 2003, Water science and technology : a journal of the International Association on Water Pollution Research.

[12]  A Pressl,et al.  Evaluation of substrate clogging processes in vertical flow constructed wetlands. , 2003, Water science and technology : a journal of the International Association on Water Pollution Research.

[13]  T. Ternes,et al.  Removal of antibiotics from urban wastewater by constructed wetland optimization. , 2011, Chemosphere.

[14]  Esther Llorens,et al.  Water quality improvement in a full-scale tertiary constructed wetland: effects on conventional and specific organic contaminants. , 2009, The Science of the total environment.

[15]  C Boutin,et al.  How to treat raw sewage with constructed wetlands: an overview of the French systems. , 2005, Water science and technology : a journal of the International Association on Water Pollution Research.

[16]  C. Metcalfe,et al.  Reduction of pharmaceutically active compounds by a lagoon wetland wastewater treatment system in Southeast Louisiana. , 2008, Chemosphere.

[17]  Christoph Ort,et al.  Sampling for pharmaceuticals and personal care products (PPCPs) and illicit drugs in wastewater systems: are your conclusions valid? A critical review. , 2010, Environmental science & technology.

[18]  Jan Vymazal,et al.  The use of hybrid constructed wetlands for wastewater treatment with special attention to nitrogen removal: a review of a recent development. , 2013, Water research.

[19]  J. Choubert,et al.  Fate of pharmaceuticals and personal care products in wastewater treatment plants--conception of a database and first results. , 2009, Environmental pollution.

[20]  A. Fernández-Alba,et al.  Photodegradation of sulfamethoxazole in various aqueous media: persistence, toxicity and photoproducts assessment. , 2009, Chemosphere.

[21]  C. Barata,et al.  A Daphnia magna feeding bioassay as a cost effective and ecological relevant sublethal toxicity test for Environmental Risk Assessment of toxic effluents. , 2008, The Science of the total environment.

[22]  L. Walker,et al.  Water Quality Improvement at Salford Quays , 1988 .

[23]  A. Fernández-Alba,et al.  Occurrence of emerging pollutants in urban wastewater and their removal through biological treatment followed by ozonation. , 2010, Water research.

[24]  C. Casellas,et al.  Estrogenic and AhR activities in dissolved phase and suspended solids from wastewater treatment plants. , 2010, The Science of the total environment.

[25]  Víctor Matamoros,et al.  Assessment of full-scale natural systems for the removal of PPCPs from wastewater in small communities. , 2010, Water research.

[26]  Pascal Molle,et al.  Potential for total nitrogen removal by combining vertical flow and horizontal flow constructed wetlands: A full-scale experiment study , 2008 .

[27]  F. Frimmel,et al.  Short-term tests with a pilot sewage plant and biofilm reactors for the biological degradation of the pharmaceutical compounds clofibric acid, ibuprofen, and diclofenac. , 2003, The Science of the total environment.

[28]  Joan García,et al.  Contaminant removal efficiency depending on primary treatment and operational strategy in horizontal subsurface flow treatment wetlands , 2011 .

[29]  J. Albaigés,et al.  Photodegradation of Carbamazepine, Ibuprofen, Ketoprofen and 17α-Ethinylestradiol in Fresh and Seawater , 2008 .

[30]  D. Barceló,et al.  Detection of hormone receptor ligands in yeast by fluorogenic methods. , 2006, Talanta.

[31]  J. Bayona,et al.  Behavior of Emerging Pollutants in Constructed Wetlands , 2007 .

[32]  J. Vymazal.  Horizontal sub-surface flow and hybrid constructed wetlands systems for wastewater treatment , 2005 .

[33]  J. Bayona,et al.  Capacity of a horizontal subsurface flow constructed wetland system for the removal of emerging pollutants: an injection experiment. , 2010, Chemosphere.

[34]  K Kayser,et al.  Processes in vertical-flow reed beds: nitrification, oxygen transfer and soil clogging. , 2005, Water science and technology : a journal of the International Association on Water Pollution Research.

[35]  A. Bodour,et al.  Prioritizing research for trace pollutants and emerging contaminants in the freshwater environment. , 2010, Environmental pollution.

[36]  J. Vymazal.  Removal of nutrients in various types of constructed wetlands. , 2007, The Science of the total environment.

[37]  Klaus Mauch,et al.  Soil clogging in vertical flow reed beds – mechanisms, parameters, consequences and.......solutions? , 1997 .

[38]  Marianna Garfí,et al.  Three-stage hybrid constructed wetland system for wastewater treatment and reuse in warm climate regions , 2013 .

[39]  P. Randerson,et al.  Constructed wetlands and vegetation filters: an ecological approach to wastewater treatment , 2006 .

[40]  D. Orvos,et al.  Aquatic toxicity of triclosan , 2002, Environmental toxicology and chemistry.

[41]  M. Cleuvers.  Aquatic ecotoxicity of pharmaceuticals including the assessment of combination effects. , 2003, Toxicology letters.

[42]  A. Fernández-Alba,et al.  Evidence of 2,7/2,8-dibenzodichloro-p-dioxin as a photodegradation product of triclosan in water and wastewater samples , 2004 .

[43]  Christian G. Daughton,et al.  “ Emerging ” Chemicals as Pollutants in the Environment : a 21 st Century Perspective , 2015 .

[44]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[45]  J. Bayona,et al.  Removal of pharmaceuticals and personal care products (PPCPs) from urban wastewater in a pilot vertical flow constructed wetland and a sand filter. , 2007, Environmental science & technology.

[46]  Bruce Blumberg,et al.  Endocrine disrupting chemicals , 2011, The Journal of Steroid Biochemistry and Molecular Biology.

[47]  J. Conkle,et al.  Degradation and sorption of commonly detected PPCPs in wetland sediments under aerobic and anaerobic conditions , 2012, Journal of Soils and Sediments.

[48]  J. Bayona,et al.  Elimination of pharmaceuticals and personal care products in subsurface flow constructed wetlands. , 2006, Environmental science & technology.

[49]  J. Bayona,et al.  Temporal evolution in PPCP removal from urban wastewater by constructed wetlands of different configuration: a medium-term study. , 2012, Chemosphere.

[50]  V. Matamoros,et al.  Evaluation of the seasonal performance of a water reclamation pond-constructed wetland system for removing emerging contaminants. , 2012, Chemosphere.

[51]  J. Fick,et al.  An evaluation of free water surface wetlands as tertiary sewage water treatment of micro-pollutants. , 2012, Ecotoxicology and environmental safety.

[52]  Klaus Kümmerer,et al.  The presence of pharmaceuticals in the environment due to human use--present knowledge and future challenges. , 2009, Journal of environmental management.

[53]  Miquel Salgot,et al.  Impact of design and operation variables on the performance of vertical-flow constructed wetlands and intermittent sand filters treating pond effluent. , 2009, Water research.

[54]  J. Bayona,et al.  Behavior of selected pharmaceuticals in subsurface flow constructed wetlands: a pilot-scale study. , 2005, Environmental science & technology.

[55]  D. Barceló,et al.  Emerging Contaminants from Industrial and Municipal Waste , 2008 .