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Water Environment Research: a Research Publication of the Water Environment Federation

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https://www.readbyqxmd.com/read/28406081/ecotoxicological-analysis-of-acrylamide-using-a-microalga-as-an-indicator-organism
#1
Bárbara Werle Nunes Keila Fernanda Hedlund Maria Angelica Oliveira And Elvis Carissimi
Aquatic ecosystems are very prone to contamination. The fast and accurate assessment of the toxicity of the water is animportant tool for environmental safety. The aim of this study was to assess the possible toxic effects of acrylamide on physiological parameters of the ChlorophyceaeandDesmodesmus quadricauda. Cells in exponential growth phase were exposed for 72 hours to different concentrations of acrylamide. Light microscopy analysis documented cell density, number of cells per coenobia, cell dimensions, and biovolume; chlorophyll "a" concentration was also determined...
April 12, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28357979/adsorption-of-as-v-cd-ii-and-pb-ii-in-multicomponent-aqueous-systems-using-activated-carbons
#2
Gerardo Cruz
This paper studies the use of two activated carbon samples made of cocoa pod husk (CPH-AC) and one commercial activatedcarbon sample in the adsorption of As(V), Cd(II) and Pb(II) from multicomponent synthetic solutions and from the Puyango-Tumbes River water, a river located in northwest Peru. The characterization of the activated carbon samples was conducted. The CPH-AC samples exhibited a specific surface area (SBET) between 709 and 1117 m2/g and a pH point of zero charge (pHPZC) between 4.4 ± 0.2 and 5 ± 0...
March 29, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28332469/marrying-step-feed-with-clarifier-improvements-increase-wet-weather-capacity-integrated-methodology
#3
Glen T Daigger John S Siczka Thomas F Smith David A Frank J A McCorquodale
The need to increase the peak wet weather secondary treatment capacity of the City of Akron, OH, Water Reclamation Facility (WRF) provided the opportunity to test an integrated methodology for maximizing the peak wet weather secondary treatment capacity of activated sludge systems. An initial investigation, consisting of process modeling of the secondary treatment system and computational fluid dynamics (CFD) analysis of the existing relatively shallow secondary clarifiers (3.3 and 3.7 m sidewater depth in 30...
March 22, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28327258/development-of-multiple-regression-models-to-predict-sources-of-fecal-pollution
#4
Kimberlee K Hall And Phillip R Scheuerman
This study assessed the usefulness of multivariate statistical tools to characterize watershed dynamics and prioritizestreams for remediation. Three multiple regression models were developed using water quality data collected from Sinking Creek in the Watauga River watershed in Northeast Tennessee. Model 1 included all water quality parameters, model 2 included parameters identified by stepwise regression, and model 3 was developed using canonical discriminant analysis. Models were evaluated in seven creeks to determine if they correctly classified land use and level of fecal pollution...
March 21, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28327257/determining-the-mechanism-for-low-sludge-yields-in-the-cannibal%C3%A2-solids-reduction-system
#5
Steven W Van Ginkel Joseph Miceli Bi-O Kim Ziming Yang Michelle Young Andrew Marcus And Bruce E Rittmann
Extracellular polymeric substances (EPS) and solids concentrations in samples from the Interchange Bioreactor (IBR) andreturn activated sludge (RAS) from Cannibal® plants having low and high sludge yields were analyzed to understand the mechanisms behind low sludge production. Low sludge yields correlated to more EPS degradation, higher concentrations of iron, and reducing conditions in the IBR. In the low-yield plants, iron was reduced when the RAS passed through the anaerobic and reducing conditions of the IBR, and this led to more EPS solubilization and degradation...
March 16, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28337963/enhanced-treatment-properties-of-iron-oxide-amended-sands-coupled-with-polyelectrolyte-to-humic-acid
#6
Dongmei Li Cuiru Wu Yizhi Wang Shuxian Jiang Shaoxiu Li Jinling Liang Wen Zhang
To improve the removal efficiency of micro-pollutant humic acid (HA) at low temperature, micro-flocculation filtrationexperiments were conducted with homemade iron oxide amended sands (IOAS), cationic polyelectrolyte (CP) and polyaluminium chloride (PACl). Fractal properties of flocs structures and IOAS surface and their effects on the removal efficiency of HA were investigated. Results showed that IOAS had a porous surface with fractal dimensions (D=1.744) and a strong adsorption capacity for HA. The flocs produced by PACl were small in size, loosely packed with a higher D, and therefore settled slowly...
March 14, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28337961/biosorption-of-heavy-metals-from-aqueous-solution-by-bacteria-isolated-from-contaminated-soil
#7
Pradeep Dhanwal Anil Kumar Shruti Dudeja Hemlata Badgujar Rohit Chauhan Abhishek Kumar Poonam Dhull Vinod Chhokar Vikas Beniwal
The study was carried out to analyze the heavy metals biosorption potential of bacteria isolated from electroplating industrial effluents contaminated soil. Bacterial isolates were screened for their multi-metal biosorption potential against copper, nickel, lead and chromium. Bacterial isolate CU4A showed maximum uptake of copper, nickel, lead and chromium in aqueous solution with biosorption efficiency as 87.16 %, 79.62%, 84.92% and 68.12%, respectively. The bacterial strain CU4A was identified as Bacillus cereus following 16S rRNA gene sequence analysis...
March 9, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28276318/biosorption-of-copper-ii-from-aqueous-solutions-by-sclerotiogenic-aspergillus-oryzae-g15
#8
Dan-Dan Long Qi Wang Jian-Rong Han
This study aimed at investigating the biosorption of the copper(II) from aqueous solutions by sclerotiogenic Aspergillus oryzae G15. Potentiometric titration analysis results indicated that carboxyl group was mainly responsible for Cu(II) adsorption. Sclerotia were superior biosorbent than mycelia, which could be ascribed to the higher amount of carboxyl sites exposed after differentiation. Langmuir isotherm model fitted well the absorption process of mycelia and sclerotia with the maximum theoretical sorption capacities of 35...
March 8, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28271819/modelization-and-statistical-optimization-of-coagulation-flocculation-treatment-of-an-old-leachate
#9
Ridha Lessoued Fatiha Souahi Leonor C Pelaez
Coagulation/flocculation process was studied using the response surface methodology (RSM) and central composite design(CCD), in order to design the experiments, develop models, evaluate the relationship between operating factors (FeCl3 dose (m) and pH), and provide an efficient method for the treatment of old leachates. The quadratic polynomial models developed for COD and turbidity responses indicated that the optimum conditions were m of 0.82 g/L at pH 5.33 with coefficient of determination R² of 98.88%, 99...
March 7, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28357978/monochloramine-loss-mechanisms-in-tap-water
#10
Qianyi Zhang Evan G R Davies James Bolton Yang Liu
Chloramination has been widely applied for drinking water disinfection, with monochloramine (NH₂Cl) the dominant chloramine species. However, under neutral pH, NH₂Cl can autodecompose and react with chemical components in drinking water, thus decreasing disinfection efficiency. In tap water, the NH₂Cl loss rate can be influenced by temperature, pH, Cl/N molar ratio, the initial NH₂Cl concentration and the natural organic matter (NOM) concentration. A good prediction of NH2Cl loss can assist in the operation of drinking water treatment plants...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28276308/why-is-the-groundwater-level-rising-a-case-study-using-hartt-to-simulate-groundwater-level-dynamics
#11
Yohannes Yihdego Cara Danis Andrew Paffard
Groundwater from a shallow unconfined aquifer at a site in coastal New South Wales has been causing recent water logging issues. A trend of rising groundwater level has been anecdotally observed over the last 10 years. It was not clear whether the changes in groundwater levels were solely natural variations within the groundwater system or whether human interference was driving the level up. Time series topographic images revealed significant surrounding land use changes and human modification to the environment of the groundwater catchment...
February 24, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377008/of-mechanisms-for-reduced-excess-sludge-production-in-the-cannibal-process-m-a-labelle-p-l-dold-y-comeau-87-8-687-696-2015
#12
Coenraad F Pretorius
No abstract text is available yet for this article.
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377007/antibacterial-activity-comparison-of-three-metal-oxide-nanoparticles-and-their-dissolved-metal-ions
#13
Qiang Qin, Jiayin Li, Jianbing Wang
  The potential ecotoxicity of three metal-oxide nanoparticles (NPs) toward Escherichia coli (E. coli) was investigated, including titanium dioxide (TiO2), copper oxide (CuO), and zinc oxide (ZnO). The true particle sizes of NPs in medium were significantly larger than the advertised sizes. Bacterial toxicity tests showed that the three NPs were harmful to varying degrees. The toxicity of CuO toward E. coli increased with the increasing concentration of CuO. The toxicity of ZnO and TiO2 toward E. coli was highest at NP concentration of 5 and 20 mg/L, respectively, but decreased when the NP concentration was higher, which is closely related with the nanoparticle sizes...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377006/identification-and-quantification-of-nitrogen-in-a-reservoir-jiaodong-peninsula-china
#14
Meng Zheng, Yanqing Sheng, Ruichuan Sun, Chongguo Tian, Haibo Zhang, Jicai Ning, Qiyao Sun, Zhaoran Li, Simon H Bottrell, Robert J G Mortimer
  Identification of nitrogen (N) sources is important in water quality control and management. Nitrogen pollution can lead to eutrophication of waterbodies and high concentrations of nitrate in drinking water can pose potential health problems. The 15N isotope and nitrogen fluxes budget approach is useful for determining the source of <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00369-ilm01.gif"/> to surface waters. In this study, mass balance and 15N isotope approaches and nitrogen flux budgets were applied to identify total nitrogen (TN) sources and nitrogen transformation processes in the Menlou Reservoir (MR), Jiaodong Peninsula, China...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377005/risks-from-ebolavirus-discharge-from-hospitals-to-sewer-workers
#15
Charles N Haas, Taylor Rycroft, Kyle Bibby, Leonard Casson
  Current World Health Organization and Centers for Disease Control and Prevention guidance for the disposal of liquid waste from patients undergoing treatment for Ebola virus disease at hospitals in the U.S. is to manage patient excreta as ordinary wastewater without pretreatment. The potential for Ebolavirus transmission via liquid waste discharged into the wastewater environment is currently unknown, however. Possible worker inhalation exposure to Ebolavirus-contaminated aerosols in the sewer continues to be a concern within the wastewater treatment community...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377004/characterization-and-performance-of-hollow-silica-for-adsorption-of-amoxicillin-in-aqueous-solutions
#16
Hongxiang Ou, Qunhui Chen, Guanghao Chen, Lili Wang, Yanzhao Xu, Jianfeng Ma, Liping Wang
  Two kinds of hollow silica materials, namely H-SiS1 and H-SiS2, were synthesized using the yeast template method and the Pickering emulsion polymerization method, respectively. The adsorbents were synthesized to adsorb amoxicillin (AMX) from an aqueous environment. Characterization results indicated that hollow silica adsorbents exhibited excellent thermal stability even at temperatures above 700 °C. Several batches of static adsorption experiments were prepared to analyze the adsorption performance on AMX...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377003/heavy-metal-ions-uptake-by-alpo-5-and-sapo-5-nanoparticles-an-experimental-and-modeling-study
#17
Rouholamin Biriaei, Rouein Halladj, Sima Askari
  Synthesis of AlPO-5 and SAPO-5 nanoparticles was followed by applying hydrothermal method to use them as adsorbents in the removal of Fe3+, Pb2+, and Cd2+ions.The synthesized products were characterized using powder X-ray diffraction, scanning electron microscope (SEM), FTIR and BET analysis. The adsorption isotherms and kinetics including Langmuir, Freundlich, pseudo-first order, pseudo-second order and intraparticle diffusion models have been employed. The experimental adsorption equilibrium and kinetic data nearly followed the Langmuir isotherm and pseudo-second order kinetic model, respectively...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377002/mechanisms-and-control-of-no2-inhibition-of-anaerobic-ammonium-oxidation-anammox
#18
Guangbin Li, Jose Maria Carvajal-Arroyo, Reyes Sierra-Alvarez, Jim A Field
Nitrite (NO2-), one of the main substrates in the anaerobic ammonium oxidation (anammox) process, has the potential to inhibit anammox bacteria. The sensitivity of anammox cells with different energy status to NO2- was evaluated, and addition of nitrate (NO3-) inhibition on the basis of narK gene with the putative function of facilitating NO3-/NO2- antiporter. The results showed that the resistance of anammox bacteria to NO2- inhibition follows the order: active-cells > starved-cells > resting-cells > starved-/resting-cells...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377001/assessing-uv-inactivation-of-adenovirus-41-using-integrated-cell-culture-real-time-qpcr-rt-qpcr
#19
Ning Ding, Stephen A Craik, Xiaoli Pang, Bonita Lee, Norman F Neumann
  Enteric adenoviruses are among most UV-resistant viruses in water. Cytopathic effects (CPE)-based cell culture TCID50 assay as a conventional virus assessment approach has major drawbacks for enteric adenovirus since it is selective on cell lines and takes longer time to show CPE. Integrated cell culture real-time quantitative PCR (ICC-qPCR) and reverse transcriptase (RT)-qPCR were applied in this study, in comparison with TCID50, to assess UV inactivation of adenovirus type 41 (Ad41) in water. Adenovirus type 41 was exposed to UV doses of 40, 80, 160, and 320 mJ/cm2 using a collimated beam apparatus...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28377000/basic-dye-adsorption-onto-clay-mnfe2o4-composite-a-mechanistic-study
#20
Adeela Kanwal, Haq Nawaz Bhatti, Munawar Iqbal, Saima Noreen
  Native, HCl pretreated clay and MnFe2O4/clay composite were investigated as an adsorbent for crystal violet (CV) removal. The adsorption behavior of dye was studied in batch experiments as a function of contact time, adsorbent dose, pH, dye initial concentration and temperature. The medium pH 8, contact time 30 min, MnFe2O4/clay composite dose 0.05 mg/L, temperature 35 °C and 100 mg/L dye initial concentration furnished maximum CV adsorption. Adsorption data fitted well to the Langmuir isotherm model and maximum CV dye adsorption capacity of composite was 49...
April 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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