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Oses G, Holub K, Rovirosa A, Castilla L, Mansilla J, Llorente R, Cortes K, Ordi J, Pahisa J, Arenas M, Sabater S, Biete A. EP-1321: Postoperative treatment results of clear-cell endometrial carcinoma: 20 cases from 2005 to 2014. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32571-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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77
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Arenas Prat M, Castellà L, Botella R, Fliquete G, Arquez M, Carulla M, Rovirosa A, Besora A, Sabater S. EP-1467: Second neoplasms after radiotherapy treatment: a population-based study. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32717-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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78
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Arenas Prat M, Díez-Presa L, Torrents-Barrena J, Arquez M, Pallas C, Gascón M, Bonet M, Latorre-Musoll A, Sabater S, Puig D. EP-1854: Mammographic texture features for determination breast cancer molecular subtype. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)33105-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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79
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Proia L, von Schiller D, Sànchez-Melsió A, Sabater S, Borrego CM, Rodríguez-Mozaz S, Balcázar JL. Occurrence and persistence of antibiotic resistance genes in river biofilms after wastewater inputs in small rivers. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 210:121-8. [PMID: 26708766 DOI: 10.1016/j.envpol.2015.11.035] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 11/10/2015] [Accepted: 11/20/2015] [Indexed: 05/28/2023]
Abstract
The extensive use of antibiotics in human and veterinary medicine and their subsequent release into the environment may have direct consequences for autochthonous bacterial communities, especially in freshwater ecosystems. In small streams and rivers, local inputs of wastewater treatment plants (WWTPs) may become important sources of organic matter, nutrients and emerging pollutants, such as antibiotic resistance genes (ARGs). In this study, we evaluated the effect of WWTP effluents as a source of ARGs in river biofilms. The prevalence of genes conferring resistance to main antibiotic families, such as beta-lactams (blaCTX-M), fluoroquinolones (qnrS), sulfonamides (sul I), and macrolides (ermB), was determined using quantitative PCR (qPCR) in biofilm samples collected upstream and downstream WWTPs discharge points in four low-order streams. Our results showed that the WWTP effluents strongly modified the hydrology, physico-chemistry and biological characteristics of the receiving streams and favoured the persistence and spread of antibiotic resistance in microbial benthic communities. It was also shown that the magnitude of effects depended on the relative contribution of each WWTP to the receiving system. Specifically, low concentrations of ARGs were detected at sites located upstream of the WWTPs, while a significant increase of their concentrations was observed in biofilms collected downstream of the WWTP discharge points (particularly ermB and sul I genes). These findings suggest that WWTP discharges may favour the increase and spread of antibiotic resistance among streambed biofilms. The present study also showed that the presence of ARGs in biofilms was noticeable far downstream of the WWTP discharge (up to 1 km). It is therefore reasonable to assume that biofilms may represent an ideal setting for the acquisition and spread of antibiotic resistance determinants and thus be considered suitable biological indicators of anthropogenic pollution by active pharmaceutical compounds.
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80
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Sabater S, Barceló D, De Castro-Català N, Ginebreda A, Kuzmanovic M, Petrovic M, Picó Y, Ponsatí L, Tornés E, Muñoz I. Shared effects of organic microcontaminants and environmental stressors on biofilms and invertebrates in impaired rivers. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 210:303-314. [PMID: 26803786 DOI: 10.1016/j.envpol.2016.01.037] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 01/13/2016] [Accepted: 01/14/2016] [Indexed: 06/05/2023]
Abstract
Land use type, physical and chemical stressors, and organic microcontaminants were investigated for their effects on the biological communities (biofilms and invertebrates) in several Mediterranean rivers. The diversity of invertebrates, and the scores of the first principal component of a PCA performed with the diatom communities were the best descriptors of the distribution patterns of the biological communities against the river stressors. These two metrics decreased according to the progressive site impairment (associated to higher area of agricultural and urban-industrial, high water conductivity, higher dissolved organic carbon and dissolved inorganic nitrogen concentrations, and higher concentration of organic microcontaminants, particularly pharmaceutical and industrial compounds). The variance partition analyses (RDAs) attributed the major share (10%) of the biological communities' response to the environmental stressors (nutrients, altered discharge, dissolved organic matter), followed by the land use occupation (6%) and of the organic microcontaminants (2%). However, the variance shared by the three groups of descriptors was very high (41%), indicating that their simultaneous occurrence determined most of the variation in the biological communities.
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81
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Gómez-Gener L, Obrador B, Marcé R, Acuña V, Catalán N, Casas-Ruiz JP, Sabater S, Muñoz I, von Schiller D. When Water Vanishes: Magnitude and Regulation of Carbon Dioxide Emissions from Dry Temporary Streams. Ecosystems 2016. [DOI: 10.1007/s10021-016-9963-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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82
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Terrado M, Momblanch A, Bardina M, Boithias L, Munné A, Sabater S, Solera A, Acuña V. Integrating ecosystem services in river basin management plans. J Appl Ecol 2016. [DOI: 10.1111/1365-2664.12613] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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83
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von Schiller D, Aristi I, Ponsatí L, Arroita M, Acuña V, Elosegi A, Sabater S. Regulation causes nitrogen cycling discontinuities in Mediterranean rivers. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 540:168-177. [PMID: 26233271 DOI: 10.1016/j.scitotenv.2015.07.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 07/04/2015] [Accepted: 07/04/2015] [Indexed: 06/04/2023]
Abstract
River regulation has fundamentally altered large sections of the world's river networks. The effects of dams on the structural properties of downstream reaches are well documented, but less is known about their effect on river ecosystem processes. We investigated the effect of dams on river nutrient cycling by comparing net uptake of total dissolved nitrogen (TDN), phosphorus (TDP) and organic carbon (DOC) in river reaches located upstream and downstream from three reservoir systems in the Ebro River basin (NE Iberian Peninsula). Increased hydromorphological stability, organic matter standing stocks and ecosystem metabolism below dams enhanced the whole-reach net uptake of TDN, but not that of TDP or DOC. Upstream from dams, river reaches tended to be at biogeochemical equilibrium (uptake≈release) for all nutrients, whereas river reaches below dams acted as net sinks of TDN. Overall, our results suggest that flow regulation by dams may cause relevant N cycling discontinuities in rivers. Higher net N uptake capacity below dams could lead to reduced N export to downstream ecosystems. Incorporating these discontinuities could significantly improve predictive models of N cycling and transport in complex river networks.
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84
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Buendia C, Bussi G, Tuset J, Vericat D, Sabater S, Palau A, Batalla RJ. Effects of afforestation on runoff and sediment load in an upland Mediterranean catchment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 540:144-157. [PMID: 26188652 DOI: 10.1016/j.scitotenv.2015.07.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 07/01/2015] [Accepted: 07/01/2015] [Indexed: 06/04/2023]
Abstract
This paper assesses annual and seasonal trends in runoff and sediment load resulting from climate variability and afforestation in an upland Mediterranean basin, the Ribera Salada (NE Iberian Peninsula). We implemented a hydrological and sediment transport distributed model (TETIS) with a daily time-step, using continuous discharge and sediment transport data collected at a monitoring station during the period 2009-2013. Once calibrated and validated, the model was used to simulate the hydrosedimentary response of the basin for the period 1971-2014 using historical climate and land use data. Simulated series were further used to (i) detect sediment transport and hydrologic trends at different temporal scales (annual, seasonal); (ii) assess changes in the contribution of extreme events (i.e. low and high flows) and (ii) assess the relative effect of forest expansion and climate variability on trends observed by applying a scenario of constant land use. The non-parametric Mann-Kendall test indicated upward trends for temperature and decreasing trends (although non-significant) for precipitation. Downward trends occurred for annual runoff, and less significantly for sediment yield. Reductions in runoff were less intense when afforestation was not considered in the model, while trends in sediment yield were reversed. Results also indicated that an increase in the river's torrential behaviour may have occurred throughout the studied period, with low and high flow events gaining importance with respect to the annual contribution, although its magnitude was reduced over time.
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85
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Terrado M, Sabater S, Chaplin-Kramer B, Mandle L, Ziv G, Acuña V. Model development for the assessment of terrestrial and aquatic habitat quality in conservation planning. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 540:63-70. [PMID: 25836757 DOI: 10.1016/j.scitotenv.2015.03.064] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 03/17/2015] [Accepted: 03/17/2015] [Indexed: 05/11/2023]
Abstract
There is a growing pressure of human activities on natural habitats, which leads to biodiversity losses. To mitigate the impact of human activities, environmental policies are developed and implemented, but their effects are commonly not well understood because of the lack of tools to predict the effects of conservation policies on habitat quality and/or diversity. We present a straightforward model for the simultaneous assessment of terrestrial and aquatic habitat quality in river basins as a function of land use and anthropogenic threats to habitat that could be applied under different management scenarios to help understand the trade-offs of conservation actions. We modify the InVEST model for the assessment of terrestrial habitat quality and extend it to freshwater habitats. We assess the reliability of the model in a severely impaired basin by comparing modeled results to observed terrestrial and aquatic biodiversity data. Estimated habitat quality is significantly correlated with observed terrestrial vascular plant richness (R(2)=0.76) and diversity of aquatic macroinvertebrates (R(2)=0.34), as well as with ecosystem functions such as in-stream phosphorus retention (R(2)=0.45). After that, we analyze different scenarios to assess the suitability of the model to inform changes in habitat quality under different conservation strategies. We believe that the developed model can be useful to assess potential levels of biodiversity, and to support conservation planning given its capacity to forecast the effects of management actions in river basins.
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86
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Ruhí A, Acuña V, Barceló D, Huerta B, Mor JR, Rodríguez-Mozaz S, Sabater S. Bioaccumulation and trophic magnification of pharmaceuticals and endocrine disruptors in a Mediterranean river food web. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 540:250-9. [PMID: 26170111 DOI: 10.1016/j.scitotenv.2015.06.009] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 06/01/2015] [Accepted: 06/02/2015] [Indexed: 05/24/2023]
Abstract
Increasing evidence exists that emerging pollutants such as pharmaceuticals (PhACs) and endocrine-disrupting compounds (EDCs) can be bioaccumulated by aquatic organisms. However, the relative role of trophic transfers in the acquisition of emerging pollutants by aquatic organisms remains largely unexplored. In freshwater ecosystems, wastewater treatment plants are a major source of PhACs and EDCs. Here we studied the entrance of emerging pollutants and their flow through riverine food webs in an effluent-influenced river. To this end we assembled a data set on the composition and concentrations of a broad spectrum of PhACs (25 compounds) and EDCs (12 compounds) in water, biofilm, and three aquatic macroinvertebrate taxa with different trophic positions and feeding strategies (Ancylus fluviatilis, Hydropsyche sp., Phagocata vitta). We tested for similarities in pollutant levels among these compartments, and we compared observed bioaccumulation factors (BAFs) to those predicted by a previously-developed empirical model based on octanol-water distribution coefficients (Dow). Despite a high variation in composition and levels of emerging pollutants across food web compartments, observed BAFs in Hydropsyche and Phagocata matched, on average, those already predicted. Three compounds (the anti-inflammatory drug diclofenac, the lipid regulator gemfibrozil, and the flame retardant TBEP) were detected in water, biofilm and (at least) one macroinvertebrate taxa. TBEP was the only compound present in all taxa and showed magnification across trophic levels. This suggests that prey consumption may be, in some cases, a significant exposure route. This study advances the notion that both waterborne exposure and trophic interactions need to be taken into account when assessing the potential ecological risks of emerging pollutants in aquatic ecosystems.
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87
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Huerta B, Rodriguez-Mozaz S, Nannou C, Nakis L, Ruhí A, Acuña V, Sabater S, Barcelo D. Determination of a broad spectrum of pharmaceuticals and endocrine disruptors in biofilm from a waste water treatment plant-impacted river. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 540:241-9. [PMID: 26087856 DOI: 10.1016/j.scitotenv.2015.05.049] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 05/13/2015] [Accepted: 05/13/2015] [Indexed: 05/25/2023]
Abstract
Wastewater treatment plants (WWTPs) are one of the main sources of pharmaceuticals and endocrine disrupting compounds in freshwater ecosystems, and several studies have reported bioaccumulation of these compounds in different organisms in those ecosystems. River biofilms are exceptional indicators of pollution, but very few studies have focused on the accumulation of these emerging contaminants. The objectives of this study were first to develop an efficient analytical methodology for the simultaneous analysis of 44 pharmaceuticals and 13 endocrine disrupting compounds in biofilm, and second, to assess persistence, distribution, and bioaccumulation of these contaminants in natural biofilms inhabiting a WWTP-impacted river. The method is based on pressurized liquid extraction, purification by solid-phase extraction, and analysis by ultra performance liquid chromatography coupled to a mass spectrometer (UPLC-MS/MS) in tandem. Recoveries for pharmaceuticals were 31-137%, and for endocrine disruptors 32-93%. Method detection limits for endocrine disruptors were in the range of 0.2-2.4 ng g(-1), and for pharmaceuticals, 0.07-6.7 ng g(-1). A total of five endocrine disruptors and seven pharmaceuticals were detected in field samples at concentrations up to 100 ng g(-1).
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88
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Ríos I, Rovirosa A, Ascaso C, Valduvieco I, Herreros A, Castilla L, Sabater S, Holub K, Pahisa J, Biete A, Arenas M. Vaginal-cuff control and toxicity results of a daily HDR brachytherapy schedule in endometrial cancer patients. Clin Transl Oncol 2015; 18:925-30. [DOI: 10.1007/s12094-015-1463-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/26/2015] [Indexed: 11/24/2022]
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89
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Acuña V, Ginebreda A, Mor JR, Petrovic M, Sabater S, Sumpter J, Barceló D. Balancing the health benefits and environmental risks of pharmaceuticals: Diclofenac as an example. ENVIRONMENT INTERNATIONAL 2015; 85:327-333. [PMID: 26454833 DOI: 10.1016/j.envint.2015.09.023] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 09/15/2015] [Accepted: 09/27/2015] [Indexed: 06/05/2023]
Abstract
Pharmaceuticals are designed to improve human and animal health, but even the most beneficial pharmaceuticals might raise some questions concerning the consequences of exposure to non-target organisms. To illustrate this situation and using diclofenac as a case-study, we analyze global consumption and occurrence data to identify hot spots of consumption without occurrence data, review the scientific literature on the harmful environmental effects to determine whether the observed concentrations in freshwater are of environmental concern, summarize the current pharmaceutical and environmental policies to highlight policy gaps, and suggest a series of research and policy recommendations, which can be summarized as follows: we need to improve the current knowledge on occurrence in freshwaters to properly implement environmental policies (i), diclofenac might pose a risk to non-target organisms in freshwater (ii); the harmful effects that some pharmaceuticals may have on the environment are not always addressed by environmental policies (iii).
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90
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Ruiz-González C, Salazar G, Logares R, Proia L, Gasol JM, Sabater S. Weak Coherence in Abundance Patterns Between Bacterial Classes and Their Constituent OTUs Along a Regulated River. Front Microbiol 2015; 6:1293. [PMID: 26635761 PMCID: PMC4659902 DOI: 10.3389/fmicb.2015.01293] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 11/06/2015] [Indexed: 11/13/2022] Open
Abstract
Deductions about the ecology of high taxonomic bacterial ranks (i.e., phylum, class, order) are often based on their abundance patterns, yet few studies have quantified how accurately variations in abundance of these bacterial groups represent the dynamics of the taxa within them. Using 454-pyrosequencing of the 16S rRNA gene, we investigated whether the changes in abundance of six dominant bacterial classes (Actinobacteria, Beta-/Alpha-/Gamma-proteobacteria, Flavobacteria, and Sphingobacteria) along a large dam-regulated river are reflected by those of their constituent Operational Taxonomic Units (OTUs; 97% similarity level). The environmental impact generated by the reservoirs promoted clear compositional shifts in all bacterial classes that resulted from changes in the abundance of individual OTUs rather than from the appearance of new taxa along the river. Abundance patterns at the class level represented the dynamics of only a small but variable proportion of their constituting OTUs, which were not necessarily the most abundant ones. Within most classes, we detected sub-groups of OTUs showing contrasting responses to reservoir-induced environmental changes. Overall, we show that the patterns observed at the class level fail to capture the dynamics of a significant fraction of their constituent members, calling for caution when the ecological attributes of high-ranks are to be interpreted.
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91
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Sabater S, Segner H, Posthuma L, Barceló D. In response: The evidence--What actions are needed to effectively transfer from science to policy? An academic perspective. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2015; 34:1208-1210. [PMID: 26013120 DOI: 10.1002/etc.2983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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92
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Sabater S. The Challenge: Assessing the effects of chemicals in freshwaters under multiple stress. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2015; 34:1206. [PMID: 26013119 DOI: 10.1002/etc.2981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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93
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Jimenez E, Mateos P, Pardo J, Font J, Montemuiño S, Ortiz I, Alastuey I, Mena A, Sabater S. PO-1085 Comparison of clinical-radiological information in contouring rectal boost. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41077-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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94
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Leon R, Esteban C, Añón J, Bono M, Grau I, Arenas M, Sabater S. EP-1682: A radiodermitis analysis comparison between 7 lotions among irradiated breast cancer patients. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41674-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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95
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Castilla L, Rovirosa A, Ríos I, Arenas M, Sabater S, Camacho C, Vargas A, Llorente R, Valduvieco I, Biete A. PO-1024: Long-term results of daily HDR brachytherapy in the postoperative setting of endometrial carcinoma. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41016-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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96
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Berenguer R, Gutierrez-Perez M, Rivera M, Nuñez-Quintanilla A, De la Vara V, Sabater S, Villas-Sanchez M. EP-1361: Comparison of 4 multichannel radiochromic film dosimetry procedures. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41353-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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97
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Núñez Quintanilla A, Berenguer R, Rivera M, De la Vara V, Gutiérrez-Pérez M, Sabater S, Villas V. PO-0924: PTV margin calculation using an IGRT system for prostate treatments. Pelvic nodes margin assessment. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40916-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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98
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Tornés E, Acuña V, Dahm CN, Sabater S. Flood disturbance effects on benthic diatom assemblage structure in a semiarid river network. JOURNAL OF PHYCOLOGY 2015; 51:133-143. [PMID: 26986264 DOI: 10.1111/jpy.12260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 11/10/2014] [Indexed: 06/05/2023]
Abstract
Disturbances such as floods and droughts play a central role in determining the structure of riverine benthic biological assemblages. Extreme disturbances from flash floods are often restricted to part of the river network and the magnitude of the flood disturbance may lessen as floods propagate downstream. The present study aimed to characterize the impact of summer monsoonal floods on the resistance and resilience of the benthic diatom assemblage structure in nine river reaches of increasing drainage size within the Gila River in the southwestern United States. Monsoonal floods had a profound effect on the diatom assemblage in the Gila River, but the effects were not related to drainage size except for the response of algal biomass. During monsoons, algal biomass was effectively reduced in smaller and larger systems, but minor changes were observed in medium systems. Resistance and resilience of the diatom assemblage to floods were related to specific species traits, mainly to growth forms. Tightly adhered, adnate and prostrate species (Achnanthidium spp., Cocconeis spp.) exhibited high resistance to repeated scour disturbance. Loosely attached diatoms, such as Nitzschia spp. and Navicula spp., were most susceptible to drift and scour. However, recovery of the diatom assemblage was very quick indicating a high resilience, especially in terms of biomass and diversity. Regional hydroclimatic models predict greater precipitation variability, which will select for diatoms resilient to bed-mobilizing disturbances. The results of this study may help anticipate future benthic diatom assemblage patterns in the southwestern United States resulting from a more variable climate.
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99
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Rodriguez-Mozaz S, Ricart M, Köck-Schulmeyer M, Guasch H, Bonnineau C, Proia L, de Alda ML, Sabater S, Barceló D. Pharmaceuticals and pesticides in reclaimed water: Efficiency assessment of a microfiltration-reverse osmosis (MF-RO) pilot plant. JOURNAL OF HAZARDOUS MATERIALS 2015; 282:165-173. [PMID: 25269743 DOI: 10.1016/j.jhazmat.2014.09.015] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2013] [Revised: 09/05/2014] [Accepted: 09/07/2014] [Indexed: 06/03/2023]
Abstract
Water reuse is becoming a common practice in several areas in the world, particularly in those impacted by water scarcity driven by climate change and/or by rising human demand. Since conventional wastewater treatment plants (WWTPs) are not able to efficiently remove many organic contaminants and pathogens, more advanced water treatment processes should be applied to WWTP effluents for water reclamation purposes. In this work, a pilot plant based on microfiltration (MF) followed by reverse osmosis (RO) filtration was applied to the effluents of an urban WWTP. Both the WWTP and the pilot plant were investigated with regards to the removal of a group of relevant contaminants widely spread in the environment: 28 pharmaceuticals and 20 pesticides. The combined treatment by the MF-RO system was able to quantitatively remove the target micropollutants present in the WWTP effluents to values either in the low ng/L range or below limits of quantification. Monitoring of water quality of reclaimed water and water reclamation sources is equally necessary to design the most adequate treatment procedures aimed to water reuse for different needs.
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100
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Acuña V, von Schiller D, García-Galán MJ, Rodríguez-Mozaz S, Corominas L, Petrovic M, Poch M, Barceló D, Sabater S. Occurrence and in-stream attenuation of wastewater-derived pharmaceuticals in Iberian rivers. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 503-504:133-141. [PMID: 24908335 DOI: 10.1016/j.scitotenv.2014.05.067] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 05/06/2014] [Accepted: 05/06/2014] [Indexed: 06/03/2023]
Abstract
A multitude of pharmaceuticals enter surface waters via discharges of wastewater treatment plants (WWTPs), and many raise environmental and health concerns. Chemical fate models predict their concentrations using estimates of mass loading, dilution and in-stream attenuation. However, current comprehension of the attenuation rates remains a limiting factor for predictive models. We assessed in-stream attenuation of 75 pharmaceuticals in 4 river segments, aiming to characterize in-stream attenuation variability among different pharmaceutical compounds, as well as among river segments differing in environmental conditions. Our study revealed that in-stream attenuation was highly variable among pharmaceuticals and river segments and that none of the considered pharmaceutical physicochemical and molecular properties proved to be relevant in determining the mean attenuation rates. Instead, the octanol-water partition coefficient (Kow) influenced the variability of rates among river segments, likely due to its effect on sorption to sediments and suspended particles, and therefore influencing the balance between the different attenuation mechanisms (biotransformation, photolysis, sorption, and volatilization). The magnitude of the measured attenuation rates urges scientists to consider them as important as dilution when aiming to predict concentrations in freshwater ecosystems.
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