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Basem S Zakaria, Sajib Barua, Ahmed Sharaf, Yang Liu, Bipro Ranjan Dhar
This study assessed the impact of antimicrobial AgNPs (50 mg L-1 , 30-50 nm) on the electrocatalytic activity of a mixed-culture anode biofilm enriched with Geobacter species. The current densities and electrochemical kinetics were maintained after exposure to AgNPs in consecutive fed-batch cycles, despite significant changes in morphological structures and bacterial communities. Bacterial community analysis showed a substantial increase in the Geobacter population in response to AgNPs exposure, indicating their higher tolerance to AgNPs...
September 11, 2018: Chemosphere
Ran Li, Xilu Wang, Bo Wang, Jian Li, Yaping Song, Biao Luo, Yuanhua Chen, Cheng Zhang, Hua Wang, Dexiang Xu
1-Nitropyrene (1-NP) is a widely distributed pollutant in the environment and is best known for its mutagenicity and carcinogenicity. In this study, we evaluated the effects of 1-NP exposure in different gestational stages on the pregnant outcomes. Pregnant mice were administered with 1-NP by gavage daily in early (GD1-GD6), middle (GD7-GD12) or late pregnancy (GD13-GD17), respectively. We found that gestational 1-NP exposure had no effect on implantation sites per litter, preterm delivery and fetal death. Interestingly, mice exposed to 1-NP in late pregnancy showed a significant reduction in fetal weight and crown-rump length...
September 11, 2018: Chemosphere
Pongsakorn Thawornpan, Supinya Thanapongpichat, Aung Win Tun, Amornrat Phongdara, Luitzen de Jong, Hansuk Buncherd
Metal oxide affinity chromatography (MOAC) is one of the most commonly used techniques for selective isolation phosphoproteins and phosphopeptides. This technique is capable of capturing the phosphorylated biomolecules through the affinity of the phosphoryl group for metal oxides/hydroxides. Fly-ash (FA), a by-product of coal-combustion power plants, is primarily composed of oxides of silicon and metals, among which iron and titanium. A number of studies have demonstrated the potential of these metal oxides for phosphoprotein and phosphopeptide enrichment...
September 11, 2018: Chemosphere
Ming Chen, Karen Shafer-Peltier, Stephen J Randtke, Edward Peltier
With increasing arsenic (As) contamination incidents reported around the world, better processes for As removal from industrial wastewater and other contaminated waters are required to protect drinking water sources. Complexation of As with cetylpyridinium chloride (CPC) cationic surfactant micelles, coupled with ultrafiltration (UF), has the potential to improve As removal, but competition from other anions could be a limiting factor. Using a binary-system ion-exchange model, the selectivity coefficients for binding of the monovalent and divalent forms of arsenate (As (V)) to cationic cetylpyridinium (CP+ ) micelles, relative to Cl- , were determined to be 0...
September 10, 2018: Chemosphere
María Belén Carboneras, José Villaseñor, Francisco Jesús Fernández-Morales, Manuel Andrés Rodrigo, Pablo Cañizares
Fluoxil-24 is a commercial herbicide based on oxyfluorfen (a hazardous non-soluble organochlorinated compound) and additional compounds used as solvents. The aim of this work is to study the biotreatability of this commercial herbicide in water through batch experiments performed at different temperatures (15, 20, 25 and 30 °C) and initial concentrations (85, 150, 300 and 500 mg L-1 of oxyfluorfen). Activated sludge from an oil refinery wastewater treatment plant was acclimated and used for biodegradation experiments...
September 10, 2018: Chemosphere
Shugen Liu, Xi Yang, Xiaofei Yao
The concentration of ammonia nitrogen is relatively high during autothermal thermophilic micro-aerobic digestion (ATMAD), which could significantly affect the sludge stabilization. This paper aims to investigate the impacts of ammonia nitrogen on ATMAD process, batch experiments were carried out with dosage of certain amount of NH4 HCO3 into digestion system. The total ammonia nitrogen (TAN) was considered as a suitable indicator to characterize the ammonia inhibition. As the TAN reached to approximately 1000 mg L-1 , the sludge digester presented a relatively low removal of volatile solids, due to adverse effects of ammonia nitrogen on sludge digestion...
September 8, 2018: Chemosphere
Qiuxiang Xu, Xuran Liu, Dongbo Wang, Yanxin Wu, Qilin Wang, Yiwen Liu, Xiaoming Li, Hongxue An, Jianwei Zhao, Fei Chen, Yu Zhong, Qi Yang, Guangming Zeng
The recovery of phosphorus from waste activated sludge (WAS) was usually at low levels due to low phosphorus release. This study presents a novel, cost-effective and eco-friendly pretreatment method, e.g., using free ammonia (FA) to pretreat WAS, to enhance the phosphorus release from WAS. Experimental results showed that the phosphorus release from WAS was significantly increased after FA pretreatment at up to 189.4 mg NH3 -N L-1 for 24 h, under which the released PO4 3- -P (i.e. 101.6 ± 6.7 mg L-1 ) was higher than that pH 9 (i...
September 8, 2018: Chemosphere
Hajar Abyar, Habibollah Younesi, Nader Bahramifar, Ali Akbar Zinatizadeh
A high rate up-flow anaerobic, anoxic and oxic (A2 O) bioreactor was designed and operated for meat-processing wastewater (MPW) treatment as a single cost-effective system with the aim of simultaneous CNP removal. The influence of three essential factors, HRT, COD/TN ratio and aerated volume fraction on the reactor performance was assessed using response surface methodology (RSM). The required HRT to reach 98.5% COD removal was achieved at 7.5 h. Simultaneous CNP removal under denitrification rate of 199...
September 8, 2018: Chemosphere
Shengxin Zhao, Zhonglin Chen, Binyuan Wang, Jimin Shen, Jinna Zhang, Dongmei Li
Remediation of high concentrations of Cr(VI) in wastewater involves its chemical reduction to Cr(III), a product with low toxicity that can be easily removed. To date, NaBH4 has rarely been used to reduce Cr(VI). This article reports a comparative study of Cr(VI) removal by NaBH4 and five sulfur-based reducing agents (FeSO4 , Na2 S2 O5 , NaHSO3 , Na2 S2 O3 , and Na2 SO3 ). The potential mechanisms of Cr(VI) removal by these six reducing agents with and without fly ash leachate (FAL) are also discussed. The results revealed that the reduction and subsequent removal of Cr(VI) are influenced by the hydrolysis and ionization of the reducing agents in solution...
September 8, 2018: Chemosphere
Ruimei Fang, Miao He, Haibao Huang, Qiuyu Feng, Jian Ji, Yujie Zhan, Dennis Y C Leung, Wei Zhao
Ag/TiO2 catalysts were prepared via in-situ synthesis and impregnation methods. The effect of redox state of Ag species on catalytic activity of Ag/TiO2 catalysts was studied. The Ag-i-300 catalyst with partially oxidized state of Ag species shows superior catalytic activity, keeping HCHO removal efficiency at an extraordinary level of 100% during the 200 min's reaction. The Ag/TiO2 catalysts were characterized by XPS, UV-Vis, BET, XRD, TEM, and in-situ DRIFTS technologies. XPS and TEM results exhibit that the partially oxidized state of Agδ+ (0 < δ < 1) and high dispersion of Ag species are beneficial for the oxidation of HCHO over Ag/TiO2 catalysts...
September 7, 2018: Chemosphere
Wenjun Feng, David T McCarthy, Rebekah Henry, Xiwang Zhang, Kefeng Zhang, Ana Deletic
Preliminary laboratory work has shown that electrochemical oxidation (ECO) is a promising technology for disinfection of harvested stormwater. This paper focuses on understanding how stormwater chemistry (e.g. pH, chloride, bicarbonate, ammonia and total organic carbon - that can vary substantially between sites) impacts the disinfection performance of ECO. Real stormwater samples from four different urban catchments were collected and tested for ECO performance in disinfecting stormwater pathogens using a boron doped diamond anode under the current density of 4...
September 7, 2018: Chemosphere
Minjia Zhang, Wei Liu, Yalin Zhou, Yong Li, Yong Qin, Yajun Xu
Epidemiological studies show that maternal exposure to PM2.5 affects the neurodevelopment of the offspring, especially the neurocognitive function. However, no relevant experimental researches have been published on toxic mechanism and diet intervention. We evaluated the effects of exposure to different doses of PM2.5 on the behavioral development of offspring via a PM2.5 exposure model established by intratracheal instillation, explored its mechanism and the protective effects of quercetin and VC intervention, and focused on the protein expression of CREB/BDNF signaling pathway...
September 7, 2018: Chemosphere
Esther Bautista-Chamizo, Ana R Borrero-Santiago, Manoela R De Orte, Ángel DelValls, Inmaculada Riba
As a result of the increasing pressure provoked by anthropogenic activities, the world climate is changing and oceans health is in danger. One of the most important factors affecting the marine environment is the well-known process called ocean acidification. Also, there are other natural or anthropogenic processes that produce an enrichment of CO2 in the marine environment (CO2 leakages from Carbon Capture and Storage technologies (CCS), organic matter diagenesis, volcanic vents, etc). Most of the studies related to acidification of the marine environment by enrichment of CO2 have been focused on short-term experiments...
September 7, 2018: Chemosphere
Rabia Saeed, Naeem Abbas, Muhammad Razaq, Zahid Mahmood, Muhammad Naveed, Hafiz Mahmood Ur Rehman
The red cotton bug, Dysdercus koenigii (Fabricius) is an important emerging economic pest of cotton, Gossypium hirsutum Linnaeus in Pakistan. Insecticides are the primary management tactics to suppress populations of this pest. However, resistance to insecticides evolves due to substantial and repeated applications. The resistance to pyrethroids, neonicotinoids and biopesticides have been evaluated in many pests worldwide, nevertheless lack of information in D. koenigii. Therefore, the aforementioned insecticide resistance in five field populations of D...
September 7, 2018: Chemosphere
Julia Nieto-Sandoval, Macarena Munoz, Zahara M de Pedro, Jose A Casas
Aqueous-phase catalytic hydrodechlorination (HDC) has been scarcely explored in the literature for the removal of chlorinated micropollutants. The aim of this work is to prove the feasibility of this technology for the fast and environmentally-friendly degradation of such kind of compounds. Diclofenac (DCF), a highly consumed anti-inflammatory drug, has been selected as the target pollutant given its toxicity and low biodegradability. The commercial Pd/Al2 O3 (1% wt.) catalyst has been used due to its prominent role on this field...
September 7, 2018: Chemosphere
Karolina Szymańska, Jerzy Falandysz, Bogdan Skwarzec, Dagmara Strumińska-Parulska
Wild growing mushrooms are traditional food items for man and also an important source of nutrients for small and big wildlife. Nevertheless, they can be species - specifically vulnerable for contamination with heavy metals and radionuclides. We studied a less known phenomenon of accumulation of highly toxic, the alpha-radiation emitter such as 210 Po and the beta emitter 210 Pb by three Leccinum mushrooms: orange oak bolete L. aurantiacum (Bull.) Gray (previous name Leccinum aurantiacum var. quercinum Pilát), foxy bolete L...
September 7, 2018: Chemosphere
Susanne Kühn, Albert van Oyen, Andy M Booth, André Meijboom, Jan A van Franeker
Studies investigating the effects of plastic litter on marine biota have almost exclusively utilised pristine plastic materials that are homogeneous in polymer type, size, shape and chemical composition. This is particularly the case for microplastics (<5 mm), where collecting sufficient quantities from the marine environment for use in laboratory impacts studies is simply not feasible. Weathered plastics collected from the marine environment show considerable physical and chemical differences to pristine and post-production consumer plastics...
September 7, 2018: Chemosphere
Jeffrey M Morris, Michel Gielazyn, Michelle O Krasnec, Ryan Takeshita, Heather P Forth, Jana S Labenia, Tiffany L Linbo, Barbara L French, J Anthony Gill, David H Baldwin, Nathaniel L Scholz, John P Incardona
The potential bioavailability of toxic chemicals from oil spills to water column organisms such as fish embryos may be influenced by physical dispersion along an energy gradient. For example, a surface slick with minimal wave action (low energy) could potentially produce different toxic effects from high energy situations such as pressurized discharge from a blown wellhead. Here we directly compared the toxicity of water accommodated fractions (WAFs) of oil prepared with low and high mixing energy (LEWAFs and HEWAFs, respectively) using surface oil samples collected during the 2010 Deepwater Horizon spill, and embryos of a representative nearshore species, red drum (Sciaenops ocellatus)...
September 6, 2018: Chemosphere
Marius Jasiulionis, Linas Balčiauskas, Laima Balčiauskienė, Ričardas Taraškevičius
This study represents the first investigation into the accumulation of chemical elements in small mammals inhabiting the territory of a great cormorant colony. Trapping was done in the Juodkrantė great cormorant colony, one of the largest colonies in Europe. The accumulation of 20 chemical elements in the bodies (muscle and bones) of yellow-necked mice (Apodemus flavicollis) was investigated using the energy-dispersive x-ray fluorescence equipment Spectro Xepos HE. Two groups of positively inter-correlated chemical elements (Mg, Al, P, Ca and Al, S, Cl, K) were identified...
September 5, 2018: Chemosphere
Julian D Muñoz Sierra, Wei Wang, Daniel Cerqueda-Garcia, Margreet J Oosterkamp, Henri Spanjers, Jules B van Lier
This study examined the temperature susceptibility of a continuous-flow lab-scale anaerobic membrane bioreactor (AnMBR) to temperature shifts from 35 °C to 55 °C and its bioconversion robustness treating synthetic phenolic wastewater at 16 gNa+. L-1 . During the experiment, the mesophilic reactor was subjected to stepwise temperature increases by 5 °C. The phenol conversion rates of the AnMBR decreased from 3.16 at 35 °C to 2.10 mgPh. gVSS-1. d-1 at 45 °C, and further decreased to 1.63 mgPh...
September 5, 2018: Chemosphere
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