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https://read.qxmd.com/read/30772925/assessment-of-spatial-variations-in-the-surface-water-quality-of-the-velhas-river-basin-brazil-using-multivariate-statistical-analysis-and-nonparametric-statistics
#1
Carolina Cristiane Pinto, Giovanna Moura Calazans, Sílvia Corrêa Oliveira
The Velhas River sub-basin, which is located in the third-largest river basin in Brazil (São Francisco), is in an advanced state of degradation. In this work, the surface water quality of the Velhas River Basin was studied at 65 monitoring sites; 16 water quality parameters were sampled quarterly for 11 years (2008 to 2013). Cluster analysis (CA) and a nonparametric Kruskal-Wallis test were associated with the analysis of violations to water quality standards to interpret the water quality data set from the Velhas River Basin and assess its spatial variations...
February 16, 2019: Environmental Monitoring and Assessment
https://read.qxmd.com/read/30772924/zarqa-river-pollution-impact-on-its-quality
#2
Abbas Al-Omari, Ibrahim Farhan, Tariq Kandakji, Fida'a Jibril
Pollutants released to the Zarqa River have been identified, quantified, and linked to their sources. The methodology included field observation of the river, collection of available quality data, literature review, and grab sampling. Identified pollution sources to the Zarqa River are wastewater treatment plants, overflow of wastewater pumping stations, and leaks from sewer lines and manholes that pass through the riverbed, in addition to industrial, commercial, domestic, and agricultural activities along the river course...
February 16, 2019: Environmental Monitoring and Assessment
https://read.qxmd.com/read/30772757/assessing-the-threats-of-organophosphate-esters-flame-retardants-and-plasticizers-to-drinking-water-safety-based-on-usepa-oral-reference-dose-rfd-and-oral-cancer-slope-factor-sfo
#3
Jiafu Li, Jiahui He, Yuna Li, Yunqing Liu, Wenjie Li, Nan Wu, Lifen Zhang, Ying Zhang, Zhiguang Niu
As one group of emerging pollutants, the threat of organophosphate esters (flame retardants and plasticizers, OPEs) to drinking water safety is not well recognized. Now, the oral reference dose (RfD) and oral cancer slope factor (SFO) of OPEs have been updated by USPEA, therefore the threat of OPEs to drinking water safety could be assessed. In this study, occurrence, health risk and key impact factor of OPEs in drinking water of China were analyzed covering 79 cities, whose population and gross domestic product (GDP) accounted for 28...
February 1, 2019: Water Research
https://read.qxmd.com/read/30772727/hydrodynamic-modelling-of-a-polluted-tropical-bay-assessment-of-anthropogenic-impacts-on-freshwater-runoff-and-estuarine-water-renewal
#4
Marko Tosic, Flávio Martins, Serguei Lonin, Alfredo Izquierdo, Juan Darío Restrepo
A bay's capacity to buffer fluvial fluxes between the land and sea is sensitive to hydrological changes that can affect its water renewal rates. In Cartagena Bay, Colombia, pollution issues have been associated with freshwater fluxes which are projected to increase in future years. This has led to plans to reduce freshwater flows by constructing upstream hydraulic doors. Given the influence of freshwater discharge on coastal water renewal, it is important to assess how these upstream changes will affect the bay's hydrodynamic processes...
February 14, 2019: Journal of Environmental Management
https://read.qxmd.com/read/30772720/removal-of-metals-from-mine-drainage-waters-by-in-situ-mineral-sorbent-based-pilot-filter-systems
#5
Heini Postila, Elisangela Heiderscheidt, Tiina Leiviskä
Discharge of metal-containing wastewater streams into the environment is an environmental concern because these pollutants do not degrade and tend to bioaccumulate. A number of laboratory-based investigations on the effectiveness of a wide range of filter materials for metal removal from diluted wastewater streams have been reported. However, only a few pilot or full-scale investigations have been conducted. Therefore, this study investigated the metal retention capabilities of mineral-based filter materials (commercially available mineral product (5-15 mm), recycled mineral material (2-4 mm) and slag by-product (2-4 and 4-16 mm)) when used in pilot-scale filter systems under continuous operation in a closed mining area in North Ostrobothnia, Finland, between June and October 2017...
February 14, 2019: Journal of Environmental Management
https://read.qxmd.com/read/30772691/remediation-of-cd-and-pb-contaminated-clay-soils-through-combined-freeze-thaw-and-soil-washing
#6
Dahu Rui, Zhipeng Wu, Mingchng Ji, Jianfei Liu, Shuren Wang, Yuzuru Ito
To improve the washing efficiency for low-permeability clay, the method of freeze-thaw synergistic chemical washing was put forward to study the cadmium (Cd)-and lead (Pb)- real-site contaminated soils as the research object and ethylene diaminete traacetic acid (EDTA) was selected as the eluent to conduct a soil column washing test of heavy metal-contaminated clay soil. Results show that repeated freeze-thaw of soil can destroy the original structure of soil particles, help the eluent fully interact with pollutants, and thus improve washing efficiency...
February 11, 2019: Journal of Hazardous Materials
https://read.qxmd.com/read/30772638/single-step-pyrolysis-of-phosphoric-acid-activated-chitin-for-efficient-adsorption-of-cephalexin-antibiotic
#7
W A Khanday, M J Ahmed, P U Okoye, Esam H Hummadi, B H Hameed
Cephalexin (CFX) antibiotic, a potent pharmaceutical water pollutant, was efficiently removed by activated carbon (AC) derived from a single-step pyrolysis of phosphoric acid-activated chitin. Experimental conditions such as temperature, CFX initial concentration, and solution pH were screened in batch adsorption. Phosphoric acid activation of chitin and subsequent pyrolysis tailored the Brunauer-Emmett-Teller surface area, total pore volume, and average pore diameter to 1199.02 m2 /g, 0.641 cm3 /g, and 21...
February 2, 2019: Bioresource Technology
https://read.qxmd.com/read/30772580/evaluation-of-the-effectiveness-of-green-infrastructure-on-hydrology-and-water-quality-in-a-combined-sewer-overflow-community
#8
Jingqiu Chen, Yaoze Liu, Margaret W Gitau, Bernard A Engel, Dennis C Flanagan, Jonathan M Harbor
Evaluation of the effectiveness of green infrastructure (GI) practices on improving site hydrology and water quality and their associated cost could provide valuable information for decision makers when creating development/re-development strategies. In this study, a watershed scale rainfall-runoff model (the Long-Term Hydrologic Impact Analysis - Low Impact Development model, the L-THIA-LID 2.1 model) was enhanced to improve its simulation of urban water management practices including GI practices. The enhanced model (L-THIA-LID 2...
January 31, 2019: Science of the Total Environment
https://read.qxmd.com/read/30772554/sulfidation-of-zvi-ac-composite-leads-to-highly-corrosion-resistant-nanoremediation-particles-with-extended-life-time
#9
Maria Vogel, Anett Georgi, Frank-Dieter Kopinke, Katrin Mackenzie
Nanoscale zero-valent iron (nZVI) is a powerful reductant for many water pollutants. The lifetime of nZVI in aqueous environments is one of its limitations. Sulfidation of the nZVI surface by reduced sulfur species is known to significantly modify the particle properties. In the present study we examined various post-synthesis sulfidation methods applied on Carbo-Iron, a composite material where iron nanostructures are embedded in colloidal activated carbon (AC) particles. In such cases, where ZVI is surrounded by carbon, sulfidation largely inhibits the anaerobic corrosion of ZVI in water whereas its dechlorination activity was slightly increased...
February 10, 2019: Science of the Total Environment
https://read.qxmd.com/read/30772548/efficacy-of-dredging-engineering-as-a-means-to-remove-heavy-metals-from-lake-sediments
#10
Musong Chen, Shiming Ding, Shuaishuai Gao, Zhen Fu, Wanying Tang, Yuexia Wu, Mengdan Gong, Dan Wang, Yan Wang
Dredging is used worldwide to remove polluted sediments from water bodies. However, the dredging efficacy remains hard to identify. Here, we studied the efficacy of dredging engineering as a means to remove Cu, Cd, and Pb from polluted lake sediments, after six years of completion. Dissolved metals and DGT-labile metals were quantified in the non-dredged and post-dredged sediments by high-resolution dialysis (HR-Peeper) and diffusive gradients (DGT) in thin films techniques. April and July measurements showed that dredging was effectively remediate the polluted sediments...
February 5, 2019: Science of the Total Environment
https://read.qxmd.com/read/30772398/transcriptomic-and-microbiota-response-on-litopenaeus-vannamei-intestine-subjected-to-acute-sulfide-exposure
#11
Yafei Duan, Yun Wang, Qingsong Liu, Dalin Xiong, Jiasong Zhang
Harmful effects of water pollutants are myriad. Sulfide from water bodies affects the aquatic animals. Intestine barrier function serves as the front-line of animals defense. Our previous study confirmed the toxic effect of sulfide on intestine immune response of Litopenaeus vannamei, but the underlying mechanisms remained elusive. Therefore, in this study, we investigated the transcriptomic and microbiota responses of the L. vannamei intestine subjected to acute sulfide exposure. Sulfide decreased bacterial richness and altered the intestine microbiota composition...
February 14, 2019: Fish & Shellfish Immunology
https://read.qxmd.com/read/30771705/fate-and-removal-of-trace-pollutants-from-an-anion-exchange-spent-brine-during-the-recovery-process-of-natural-organic-matter-and-salts
#12
Elisabeth Vaudevire, Farzaneh Radmanesh, Annemieke Kolkman, Dennis Vughs, Emile Cornelissen, Jan Post, Walter van der Meer
The results of this sampling campaign on pilot scale processes aim to evaluate the occurrence and behavior of trace organic micro-pollutants and metal elements during anion exchange treatment of surface water and the subsequent treatment of generated spent brine with two types of electrodialysis membrane pairs. This knowledge is relevant to assess the quality and reusability of secondary products created during brine treatment; specifically the excess of sodium chloride to be recycled onsite and the natural organic matter, mostly consisting of humic substances, which find multiple applications in the agricultural industry...
February 4, 2019: Water Research
https://read.qxmd.com/read/30771668/degradation-of-methyl-orange-on-fe-ag-nanoparticles-immobilized-on-polyacrylonitrile-nanofibers-using-edta-chelating-agents
#13
Eutilério F C Chaúque, J Catherine Ngila, Sekhar C Ray, Lwazi Ndlwana
Bimetallic nanoparticles are effective for the removal of organic pollutants from environmental water samples through catalytic degradation reactions. Hence, this work reports on the preparation of Fe/Ag bimetallic nanoparticles immobilized on electrospun polyacrylonitrile nanofibers (PAN NFs) pre-functionalized with EDTA and ethylenediamine (EDA) chelating agents. Characterization techniques included attenuated total reflectance coupled to Fourier transform infrared spectrometer (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA)...
February 13, 2019: Journal of Environmental Management
https://read.qxmd.com/read/30771636/exploration-of-the-adsorption-performance-and-mechanism-of-zeolitic-imidazolate-framework-8-graphene-oxide-for-pb-ii-and-1-naphthylamine-from-aqueous-solution
#14
Junyi Wang, Yucheng Li, Zhimin Lv, Yi Xie, Junjie Shu, Ahmed Alsaedi, Tasawar Hayat, Changlun Chen
A novel composite of zeolitic imidazolate framework grown on graphene oxide (ZIF-8@GO) was successfully prepared and used for the adsorption of Pb(II) and 1-naphthylamine from aqueous solutions. The effects of contact time, pH, ionic strength and temperature on the adsorption performance of ZIF-8@GO was investigated by batch experiments. Compared to the bare ZIF-8 and GO, the ZIF-8@GO exhibited a significant increase in the adsorption for Pb(II) and 1-naphthylamine. The maximum adsorption capacities of ZIF-8@GO towards Pb(II) and 1-naphthylamine reached 356...
February 11, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30770948/influence-of-land-use-and-cover-on-toxicogenetic-potential-of-surface-water-from-central-west-brazilian-rivers
#15
Juliana Caroline Vivian Sposito, Luiza Flavia Veiga Francisco, Bruno do Amaral Crispim, Fabiana Gomes da Silva Dantas, Jéssica Pereira de Souza, Lucilene Finoto Viana, Julio César Jut Solórzano, Kelly Mari Pires de Oliveira, Alexeia Barufatti
The objective of this study was to evaluate toxicogenetic potential of surface water samples from rivers of center-west Brazil and analyze the influence of land use and cover and physicochemical parameters in genetic damage. Samples were collected during winter (June) and summer (November) at sampling sites from Dourados and Brilhante Rivers (Mato Grosso do Sul/Brazil). The toxicogenetic variables, including chromosomal alterations, micronuclei, and mitotic index, were analyzed in meristematic cells of Allium cepa; and micronuclei, nuclear abnormalities, and DNA strand breaks (arbitrary units, AUT ) were analyzed in erythrocytes of Astyanax lacustris...
February 15, 2019: Archives of Environmental Contamination and Toxicology
https://read.qxmd.com/read/30769936/disinfection-by-products-and-ecotoxic-risk-associated-with-hypochlorite-treatment-of-tramadol
#16
Valeria Romanucci, Antonietta Siciliano, Emilia Galdiero, Marco Guida, Giovanni Luongo, Renato Liguori, Giovanni Di Fabio, Lucio Previtera, Armando Zarrelli
In recent years, many studies have highlighted the consistent finding of tramadol (TRA) in the effluents from wastewater treatment plants (WTPs) and also in some rivers and lakes in both Europe and North America, suggesting that TRA is removed by no more than 36% by specific disinfection treatments. The extensive use of this drug has led to environmental pollution of both water and soil, up to its detection in growing plants. In order to expand the knowledge about TRA toxicity as well as the nature of its disinfection by-products (DBPs), a simulation of the waste treatment chlorination step has been reported herein...
February 15, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/30769911/photochemical-synthesis-of-nanosheet-tin-di-sulfide-with-sunlight-response-on-water-pollutant-degradation
#17
Juan Matmin, Mohamad Azani Jalani, Hazwanee Osman, Qistina Omar, NorulNazilah Ab'lah, Kelimah Elong, Muhd Firdaus Kasim
The photochemical synthesis of two-dimensional (2D) nanostructured from semiconductor materials is unique and challenging. We report, for the first time, the photochemical synthesis of 2D tin di/sulfide (PS-SnS₂-x , x = 0 or 1) from thioacetamide (TAA) and tin (IV) chloride in an aqueous system. The synthesized PS-SnS₂-x were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), a particle size distribution analyzer, X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), thermal analysis, UV⁻Vis diffuse reflectance spectroscopy (DR UV⁻Vis), and photoluminescence (PL) spectroscopy...
February 14, 2019: Nanomaterials
https://read.qxmd.com/read/30769307/the-effect-of-dams-on-river-transport-of-microplastic-pollution
#18
Lisa Watkins, Susan McGrattan, Patrick J Sullivan, M Todd Walter
Dams are known to trap pollutants such as metals and PCBs in the sediment that accumulates within their reservoirs. As more attention is paid to microplastics, an emerging contaminant in waterways worldwide, and how they move along rivers, whether microplastic particles also accumulate behind dams is an important question for informing estimates of global river inputs to oceans. In this study, we measured microplastic concentrations above, below, and within the reservoirs of six dams near Ithaca, NY USA. Samples were processed following the wet peroxide oxidation method and visual counting, followed by Raman Spectroscopy validation...
February 3, 2019: Science of the Total Environment
https://read.qxmd.com/read/30769290/real-time-monitoring-of-water-quality-of-stream-water-using-sulfur-oxidizing-bacteria-as-bio-indicator
#19
Sedky H A Hassan, Anup Gurung, Woo-Chang Kang, Beom-Soo Shin, Mostafa Rahimnejad, Byong-Hun Jeon, Jung Rae Kim, Sang-Eun Oh
In aquatic ecosystems, real-time water-quality (WQ) biomonitoring has become the most effective technology for monitoring toxic events by using living organisms as a biosensor. In this study, an online WQ monitoring system using sulfur oxidizing bacteria (SOB) was tested to monitor WQ changes in real-time in natural stream water. The WQ monitoring system consisted of three SOB reactors (one continuous and two semi-continuous mode reactors). The SOB system did not detect any toxicity in relatively-unpolluted, natural stream water when operated for more than six months...
January 31, 2019: Chemosphere
https://read.qxmd.com/read/30769226/effect-of-calcium-peroxide-on-the-water-quality-and-bacterium-community-of-sediment-in-black-odor-water
#20
Wen-Huai Wang, Yi Wang, Pan Fan, Lin-Feng Chen, Bao-Hua Chai, Jing-Chan Zhao, Lu-Qin Sun
This study investigated how efficiently CaO2 could treat black-odor landscape water caused by low dissolved oxygen (DO) in a field experiment of 600 m2 . The study demonstrated that CaO2 could significantly elevate the DO concentration in waters and the oxidation-reduction potential (ORP) level in sediments (p = 0.003 and p = 0), which is conducive to improving the anoxic environment of landscape water. The concentrations of total chemical oxygen demand (TCOD) and S2- in overlying and interstitial waters were considerably decreased...
November 23, 2018: Environmental Pollution
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