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Aziza Hadj Ltaïef, Simona Sabatino, Federica Proietto, Salah Ammar, Abdellatif Gadri, Alessandro Galia, Onofrio Scialdone
The treatment of toxic organic pollutants by electro-Fenton (EF) presents some drawbacks such as the necessity to work at low pH and the low solubility of oxygen in water contacted with air or oxygen at room pressure that results often in slow and relatively low abatements. Here, the coupled adoption of natural heterogeneous catalysts and of relatively high pressure was proposed in order to improve the performances of EF for the treatment of organic pollutants. Caffeic acid (CA) and 3-chlorophenol were used as model resistant organic pollutants...
March 12, 2018: Chemosphere
María Lovato, José Real Buffelli, Mariana Abrile, Carlos Martín
The application of conventional physicochemical and microbiological techniques for the removal of organic pollutants has limitations for its utilization on wastewaters as landfill leachates because of their high concentration of not easily biodegradable organic compounds. The use of ozone-based technologies is an alternative and complementary treatment for this type of wastewaters. This paper reports the study of the degradation of landfill leachates from different stages of a treatment plant using ozone and ozone + UV...
March 19, 2018: Environmental Science and Pollution Research International
Guangshuai Zhang, Xiubo Yu, Jun Xu, Houlang Duan, Loretta Rafay, Quanjun Zhang, Ya Li, Yu Liu, Shaoxia Xia
Unique hydrological characteristics and complex topography can create wide-ranging dry season environmental heterogeneity in response to groundwater level across China's Jiangxi Province Poyang Lake wetland. Soil traits are one of several fluctuating environmental variables. To determine the effects of soil variables on stable isotope (δ13 C and δ15 N) abundances during decomposition, we performed a field experiment using Carex cinerascens along a groundwater level gradient (GT-L: -25 to -50cm, GT-LM: -15 to -25cm, GT-MH: -5 to -15cm, GT-H: 5 to -5cm) in a shallow lake...
March 2, 2018: Science of the Total Environment
Mohsen Behbahani, Boren Lin, Tamara L Phares, Youngwoo Seo
The objective of this study is to evaluate the influence of water distribution system conditions (pH, total organic carbon, residual chlorine, and phosphate) on haloacetic acids (HAAs) biodegradation. A series of batch microcosm tests were conducted to determine biodegradation kinetics and collected biomass was used for real time quantitative reverse transcription polymerase chain reaction analyses to monitor how these drinking water distribution system conditions affect the relative expression of bacterial dehalogenase genes...
March 3, 2018: Journal of Hazardous Materials
Chang-Gu Lee, Hassan Javed, Danning Zhang, Jae-Hong Kim, Paul Westerhoff, Qilin Li, Pedro J J Alvarez
Using a bi-polymer system consisting of polyvinylpyrrolidone (PVP) and poly(vinylidene fluoride) (PVDF), P25-TiO2 was immobilized into thin film mats of porous electrospun fibers. Pores were introduced by dissolving sacrificial PVP to increase surface area and enhance access to TiO2. The highest photocatalytic activity was achieved using a PVDF:PVP weight ratio of 2:1. Methylene blue (MB) was used to visualize contaminant removal, assess the sorption capacity (5.93 ± 0.23 mg/g) and demonstrate stable removal kinetics (kMB > 0...
March 19, 2018: Environmental Science & Technology
Siyang Liu, Shuhan Tian, Kexin Li, Lingqing Wang, Tao Liang
The lack of management in small-scale mining operations has the potential for negative repercussions, e.g., mine collapses, compared with well-regulated large-scale mines. Here, we used an in vitro model to investigate heavy metal soil pollution characteristics and their attendant health risks in an abandoned, small-scale lead (Pb) and zinc (Zn) mine located in southwestern China that had suffered from collapse. Our results showed the following: (1) Even the mine had been closed for many years, the soil was still heavily polluted by Pb, cadmium (Cd), and Zn, and there is a risk of secondary pollution...
March 19, 2018: Environmental Science and Pollution Research International
He-Shan Zheng, Wan-Qian Guo, Qu-Li Wu, Nan-Qi Ren, Jo-Shu Chang
Hospital wastewater is one of the possible sources responsible for antibiotic resistant bacteria spread into the environment. This study proposed a promising strategy, electro-peroxone (E-peroxone) pretreatment followed by a sequencing batch reactor (SBR) for simulated hospital wastewater treatment, aiming to enhance the wastewater treatment performance and to reduce antibiotic resistance genes production simultaneously. The highest chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiency of 94...
March 15, 2018: Environment International
Yan Wu, Yun Kang, Liqiu Zhang, Dan Qu, Xiang Cheng, Li Feng
In this study, direct contact membrane distillation (DCMD) was used for treating fermentation wastewater with high organic concentrations. DCMD performance characteristics including permeate flux, permeate water quality as well as membrane fouling were investigated systematically. Experimental results showed that, after 12hr DCMD, the feed wastewater was concentrated by about a factor of 3.7 on a volumetric basis, with the permeate flux decreasing from the initial 8.7L/m2 /hr to the final 4.3L/m2 /hr due to membrane fouling; the protein concentration in the feed wastewater was increased by about 3...
March 2018: Journal of Environmental Sciences (China)
Daoping Zha, Ying Li, Cunman Yang, Chi Yao
Organophosphate flame retardants (OPFRs) have been detected in the surface water, suspended sediments, and river sediments from the Yangtze River in China. A modified polar organic chemical integrative sampler (m-POCIS) was successfully used to quantify the OPFR concentrations in surface water. The OPFR concentrations estimated by the field m-POCIS at six sampling locations ranged from 8.99 to 112.45 ng/L with an average concentration of 47.04 ng/L. The OPFR concentrations in suspended sediments were related to the sediment particle size distribution...
March 15, 2018: Environmental Monitoring and Assessment
Rodrigo de Abreu Domingos, Fabiana Valéria da Fonseca
The oil refinery industry seeks solutions to reduce its water uptake and consumption by encouraging the reuse of internal streams and wastewater from treatment systems. After conventional treatment the petroleum refinery wastewater still contains a considerable quantity of recalcitrant organics and the adsorption on activated carbon is currently used in Brazilian refineries, although it is still expensive due to the difficulty of its regeneration. This study evaluated the use of adsorbent and ion exchange resins for the removal of organic matter from refinery wastewater after conventional treatment in order to verify its feasibility, applying successive resin regenerations and comparing the results with those obtained for activated carbon process...
March 12, 2018: Journal of Environmental Management
Juliën N A P Wijers, Geneviève A F S van Liere, Christian J P A Hoebe, Jochen W L Cals, Petra F G Wolffs, Nicole H T M Dukers-Muijrers
BACKGROUND: For Chlamydia trachomatis (CT), a test of cure (TOC) within 3-5 weeks is not recommended. International guidelines differ in advising a Neisseria gonorrhoeae (NG) TOC. Retesting CT and NG positives within 3-12 months is recommended in international guidelines. We assessed TOC and retesting practices including extragenital testing in general practitioner (GP) practices located in different socioeconomic status (SES) areas to inform and optimize local test practices. METHODS: Laboratory data of 48 Dutch GP practices between January 2011 and July 2016 were used...
2018: PloS One
Joanna Kyzioł-Komosińska, Joanna Augustynowicz, Wojciech Lasek, Justyna Czupioł, Daniel Ociński
The present study focused on the use of the dry mass of the macrophyte Callitriche cophocarpa as an effective biosorbent for chromium removal from concentrated solutions, typical for industrial effluents. In order to evaluate the usability of C. cophocarpa as the Cr(III) sorbent, its detailed physicochemical characterization has been performed as well as the preliminary adsorption studies. The biosorbent was characterized by specific surface area (SSA), porosity, total organic carbon (TOC), inorganic content as well as the cation exchange capacity (CEC), dominant exchangeable cations and anion exchange capacity (AEC), point of zero charge (pHpzc ) and buffering capacity...
March 10, 2018: Journal of Environmental Management
Yong Liu, Qing Fan, Yanlan Liu, Jianlong Wang
In this paper, a zinc-iron-carbon nanotubes (Zn-Fe-CNTs) composite was prepared, characterized and used to develop a Fenton-like system of Zn-Fe-CNTs/O2 for the degradation of 4-chlorophenol (4-CP), in which H2 O2 was generated in situ from zinc-carbon galvanic cells and oxygen in aqueous solution was activated by iron attached on the surface of CNTs to produce ·OH radicals for the oxidation of 4-CP. The experimental results showed that the particles of Zn and Fe in Zn-Fe-CNTs composite were adhered to the surface of CNTs, which accelerated the electron transfer process...
March 10, 2018: Journal of Environmental Management
Ane Urtiaga, Alvaro Soriano, Jordi Carrillo-Abad
The concerns about the undesired impacts on human health and the environment of long chain perfluorinated alkyl substances (PFASs) have driven industrial initiatives to replace PFASs by shorter chain fluorinated homologues. 6:2 fluorotelomer sulfonic acid (6:2 FTSA) is applied as alternative to PFOS in metal plating and fluoropolymer manufacture. This study reports the electrochemical treatment of aqueous 6:2 FTSA solutions on microcrystalline BDD anodes. Bench scale batch experiments were performed, focused on assessing the effect of the electrolyte and the applied current density (5-600 A m-2 ) on the removal of 6:2 FTSA, the reduction of total organic carbon (TOC) and the fluoride release...
March 7, 2018: Chemosphere
Mathieu Gauthé, Nathalie Testart Dardel, Fernando Ruiz Santiago, Jessica Ohnona, Valérie Nataf, Françoise Montravers, Jean-Noël Talbot
OBJECTIVES: To develop criteria to improve discrimination between vertebral metastases from neuroendocrine tumours (NETs) and benign bone lesions on PET combined with CT using DOTA-D-Phe1 -Tyr3 -octreotide labelled with gallium-68 (68 Ga-DOTA-TOC). METHODS: In 535 NET patients,68 Ga-DOTA-TOC PET/CT examinations were reviewed retrospectively for vertebral CT lesions and/or PET foci. For each vertebral PET abnormality, appearance on CT, biological volume (BV), standardized uptake value (SUVmax ) and ratios to those of reference organs were determined...
March 12, 2018: European Radiology
Marie Paquet, Mathieu Gauthé, Jules Zhang Yin, Valérie Nataf, Ophélie Bélissant, Philippe Orcel, Christian Roux, Jean-Noël Talbot, Françoise Montravers
PURPOSE: Oncogenic osteomalacia is an endocrine disorder induced by small benign tumours (TIO) producing excessive fibroblast growth factor-23 (FGF23). The only way of curing oncogenic osteomalacia is surgical resection of the culprit TIO, which is extremely difficult to detect using conventional imaging modalities due to its small size and variable location in the body. Since TIO frequently overexpress somatostatin receptors, a clinical utility of SPECT or PET with radiolabelled somatostatin analogues has been reported...
March 12, 2018: European Journal of Nuclear Medicine and Molecular Imaging
Hiroshige Mikamo, Yoshio Takesue, Yuji Iwamoto, Takahiko Tanigawa, Masaharu Kato, Yoko Tanimura, Shigeru Kohno
The objective of this open-label, randomised (i.e. 2:1 ratio), Phase 3 study was to compare the efficacy and safety of tedizolid phosphate 200 mg, once-daily treatment with that of linezolid 600 mg, twice-daily treatment for 7-14 days in Japanese adult patients (N = 125) with skin and soft tissue infections (SSTIs) and/or for 7-21 days for those with SSTI-related bacteraemia, caused by confirmed or highly suspected methicillin-resistant Staphylococcus aureus (MRSA). Primary outcome was clinical cure rate at test-of-cure (TOC, in SSTI: 7-14 days, in bacteraemia: 4-6 weeks after end-of-therapy [EOT]) time point in the microbiologically evaluable MRSA (ME-MRSA) population (N = 39)...
March 9, 2018: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
Xueqing Shi, Tsuey Shan Yeap, Shujuan Huang, Jianqiu Chen, How Yong Ng
A green microalga Chlorella sp. isolated from marine environment was investigated for its potential to pretreat saline antibiotic wastewater containing amoxicillin (AMX). Through Biolog EcoPlate assay, the Chlorella sp. showed its unique carbon source metabolic patterns under autotrophic condition. In addition, the microalga could effectively remove AMX (>99%) under initial AMX concentrations ranging from 10 to 150 mg/L through a treatability test. In the continuous AMX treatment using a lab-scale membrane photobioreactor (MPBR), a stable AMX removal efficiency of 85...
February 24, 2018: Bioresource Technology
Garzón-Zúñiga Marco Antonio, Alvillo-Rivera Angélica Julieta, Ramírez Camperos Esperanza, Buelna Gerardo, Díaz-Godínez Gerardo, Estrada-Arriaga Edson Baltazar
This study was focused on the application of an aerobic biofiltration (BF) with Ficus benjamina wood chips as support medium, inoculated with two basidiomycete fungi, Phanerochaete chrysosporium (BF 1) and Trametes versicolor (BF 2), to treat Tequila vinasses from a Tequila industry. The biofiltration system was compared with a biofilter system without basidiomycete fungi (BF W), in order to determine the influence of fungi on the treatment of vinasses. Three different vinasses/water ratios (30/70, 40/60, and 50/50) were evaluated...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Guilaine Jaria, Carla Patrícia Silva, João A B P Oliveira, Sérgio M Santos, María Victoria Gil, Marta Otero, Vânia Calisto, Valdemar I Esteves
The wide occurrence of pharmaceuticals in aquatic environments urges the development of cost-effective solutions for their removal from water. In a circular economy context, primary paper mill sludge (PS) was used to produce activated carbon (AC) aiming the adsorptive removal of these contaminants. The use of low-cost precursors for the preparation of ACs capable of competing with commercial ACs continues to be a challenge. A full factorial design of four factors (pyrolysis temperature, residence time, precursor/activating agent ratio, and type of activating agent) at two levels was applied to the production of AC using PS as precursor...
February 26, 2018: Journal of Hazardous Materials
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