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Water Science and Technology: a Journal of the International Association on Water Pollution Research

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https://www.readbyqxmd.com/read/30388098/enhanced-ammonium-removal-efficiency-by-ion-exchange-process-of-synthetic-zeolite-after-na-and-heat-pretreatment
#1
Kyujin Ham, Beom Seok Kim, Kwon-Young Choi
In this study, the optimum ammonium removal by activation of synthetic zeolite in the aqueous phase was investigated by batch ion exchange adsorption assay, and its surface changes due to activation modification was elucidated accordingly. Among the adsorbents examined, modified synthetic zeolite A-4 was the most effective at ammonium removal. The best activation condition of zeolite A-4 was established by Na+ and 300 °C heat treatment at pH around 6 to 7. Besides, the removal efficiency was investigated under various reaction conditions of pH, adsorbent dosage, stirring speed, and initial ammonium concentration...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388097/performance-and-uncertainties-of-tss-stormwater-sampling-strategies-from-online-time-series
#2
Santiago Sandoval, Jean-Luc Bertrand-Krajewski, Nicolas Caradot, Thomas Hofer, Günter Gruber
The event mean concentrations (EMCs) that would have been obtained by four different stormwater sampling strategies are simulated by using total suspended solids (TSS) and flowrate time series (about one minute time-step and one year of data). These EMCs are compared to the reference EMCs calculated by considering the complete time series. The sampling strategies are assessed with datasets from four catchments: (i) Berlin, Germany, combined sewer overflow (CSO); (ii) Graz, Austria, CSO; (iii) Chassieu, France, separate sewer system; and (iv) Ecully, France, CSO...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388096/grit-particle-characterization-influence-of-sample-pretreatment-and-sieving-method
#3
Q Plana, J Carpentier, F Tardif, A Pauléat, A Gadbois, P Lessard, P A Vanrolleghem
Grit causes problems in water resource recovery facilities (WRRFs): clogging pipes, damaging pumps, and reducing the active volume of aeration tanks and anaerobic digesters by grit accumulation. Grit chambers are built to remove these particles. However, no standardized methodology exists to characterize grit particles for grit chamber design and operation despite the large observed variability in grit composition. Therefore, this paper proposes a combination and adaptation of existing methods to sample and characterize grit particles in view of proper grit chamber design and its modelling to ultimately optimize the efficiency of this important WRRF unit process...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388095/generation-of-reactive-oxygen-species-by-promoting-the-cu-ii-cu-i-redox-cycle-with-reducing-agents-in-aerobic-aqueous-solution
#4
Wenshu Li, Peng Zhou, Jing Zhang, Yongli Zhang, Gucheng Zhang, Yang Liu, Xin Cheng
This study investigated the generation of reactive oxygen species (ROS) (O2 - •, H2 O2 , and HO•) by promoting the Cu(II)/Cu(I) redox cycle with certain reducing agents (RAs) in aerobic aqueous solution, and benzoic acid (BA) was employed as indicator for the hydroxyl radical (HO•). Hydroxylamine (HA) can reduce Cu(II) to Cu(I) to induce chain reactions of copper species resulting in the generation of the superoxide radical (O2 - •) and hydrogen peroxide (H2 O2 ), and the intermediate Cu(I) can further activate H2 O2 via a Fenton-like reaction to produce HO•, creating the remarkable BA degradation...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388094/enhanced-removal-of-chromium-vi-from-wastewater-using-active-carbon-derived-from-lantana-camara-plant-as-adsorbent
#5
Sujitha Ravulapalli, Ravindhranath Kunta
Activate carbon prepared from the stems of Lantana camara plant (ACSLC) is investigated as adsorbent for the removal of chromium (Cr) (VI) from polluted water using batch methods of extraction. Various extraction conditions such as pH, initial concentration of Cr (VI), sorbent dosage, temperature, equilibration time and presence of co-ions are optimized. The adsorption capacity is found to be 26.25 mg/g and is more than hitherto reported sorbents in the literature. The spent adsorbent can be regenerated and reused with a marginal reduction in its adsorption capacity...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388093/survival-of-eskape-pathogen-acinetobacter-baumannii-in-water-of-different-temperatures-and-ph
#6
Svjetlana Dekic, Jasna Hrenovic, Tomislav Ivankovic, Erna van Wilpe
Bacterium Acinetobacter baumannii is an emergent pathogen associated with nosocomial infections, which can be also found in natural waters. The impact of ecological factors on A. baumannii is insufficiently investigated. The aim was to examine the influence of temperatures (-20 to 80 °C) and pH values (2 to 12) on the survival of environmental and clinical isolates of A. baumannii in nutrient-deprived spring water (SW) and nutrient-rich diluted nutrient broth during 5 months. A. baumannii successfully survived at -20 to 44 °C and neutral pH for 5 months, which is consistent with the persistence of this pathogen in the hospital environment...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388092/alternative-use-of-pseudomonas-aeruginosa-as-indicator-for-greywater-disinfection
#7
Anderson Teodoro, Amilcar Machulek Júnior, Marc Árpád Boncz, Paula Loureiro Paulo
Greywater presents great potential for reuse; if treated correctly and efficiently, it can be used for several residential uses. The objective of this work was to test advanced oxidation for greywater disinfection through UV/TiO2 , UV/TiO2 /H2 O2 , photo-Fenton, UV/H2 O2 and photolysis (UV) processes, using Pseudomonas aeruginosa as an alternative indicator. In general, the processes with hydrogen peroxide (150 mg.L-1 ) mixed in the pretreated greywater and exposed to solar radiation or artificial radiation from UV lamps were the most efficient in the disinfection experiments, with total inactivation of P...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388091/highly-efficient-cd-ii-adsorption-using-mercapto-modified-bentonite-as-a-novel-adsorbent-an-experimental-design-application-based-on-response-surface-methodology-for-optimization
#8
Ümit Ecer, Şakir Yılmaz, Tekin Şahan
We report the optimization with response surface methodology (RSM) for adsorption conditions required for removal of Cd(II) from an aqueous environment with 3-mercaptopropyl trimethoxysilane-modified bentonite (MMB). Central composite design (CCD) in RSM was used to optimize the most significant adsorption variables of initial pH, temperature (°C), initial Cd(II) concentration (Co , mg L-1 ) and adsorbent dosage (g). With the quadratic model equation obtained from CCD, the optimum values were determined as initial pH 6...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388090/adsorption-of-chlortetracycline-onto-biochar-derived-from-corn-cob-and-sugarcane-bagasse
#9
Lin Zhang, Lei Tong, Pengguang Zhu, Peng Huang, Zhengyu Tan, Fangling Qin, Wen Shi, Mengyun Wang, Han Nie, Guicheng Yan, Hongtao Huang
Biochar was prepared from two different types of biological waste materials, corn cob (CC) and sugarcane bagasse (SB). The adsorption capacity of each class of adsorbent was determined by chlortetracycline (CTC) adsorption tests. The adsorption kinetics and isotherms of chlortetracycline onto sugarcane bagasse biochar (SBB) and corn cob biochar (CCB) were studied. Experimental results indicated that pseudo-second-order adsorption kinetics of CTC onto SBB and CCB were more reasonable than pseudo-first-order kinetics, and the adsorption kinetic model of CTC onto SBB was slightly better than that onto CCB...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388089/mineralization-of-quinoline-in-aqueous-solution-by-microwave-assisted-catalytic-wet-peroxide-oxidation-system-process-optimization-products-analysis-and-degradation-route-research
#10
Zhipeng Li, Feng Liu, Bo Zhang, Yi Ding, Hong You, Chao Jin
The experimental design methodology was used to optimize the experimental parameters of quinoline mineralization by microwave-enhanced catalytic wet peroxide oxidation (CWPO). Initial pH value, temperature, H2 O2 dosage, and microwave power were selected as independent variables. The mineralization efficiency approached 83.82% under the optimized conditions: initial pH 6.00, temperature 60 °C, H2 O2 dosage 0.09 mol/L, and microwave power 565.10 W. Regression analysis with an R2 value of 0.9867 showed a good agreement between the experimental results and the predicted values...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388088/performance-and-bacterial-diversity-of-bioreactors-used-for-simultaneous-removal-of-sulfide-solids-and-organic-matter-from-uasb-reactor-effluents
#11
L S Azevedo, I M P Castro, C D Leal, J C Araújo, C A L Chernicharo
Two bioreactors were investigated as an alternative to post-treatment of effluent from an upflow anaerobic sludge blanket (UASB) reactor treating domestic sewage, with an aim of oxidizing sulfide into elemental sulfur, and removal of solid and organic material. The bioreactors were operated at different hydraulic retention times (HRTs) (6, 4, and 2 h) and in the presence or absence (control) of packing material (polypropylene rings). Greater sulfide removal efficiencies - 75% (control reactor) and 92% (packed reactor) - were achieved in both reactors for an HRT of 6 h...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388087/long-term-investigation-of-phosphorus-removal-by-iron-electrocoagulation-in-small-scale-wastewater-treatment-plants
#12
I Mishima, M Hama, Y Tabata, J Nakajima
Small-scale wastewater treatment plants (SWTPs), called Johkasou, are widely used as decentralized and individual wastewater treatment systems in sparsely populated areas in Japan. Even in SWTPs, nutrients should be removed to control eutrophication. An iron electrolysis method is effective to remove phosphorus chemically in SWTPs. However, it is necessary to determine the precise conditions under which phosphorus can be effectively and stably removed in full scale SWTPs for a long period. Therefore, long-term phosphorus removal from SWTPs was investigated and optimum operational conditions for phosphorus removal by iron electrolysis were analyzed in this study...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388086/sensitivity-analysis-for-an-elemental-sulfur-based-two-step-denitrification-model
#13
A Kostrytsia, S Papirio, M R Mattei, L Frunzo, P N L Lens, G Esposito
A local sensitivity analysis was performed for a chemically synthesized elemental sulfur (S0 )-based two-step denitrification model, accounting for nitrite (NO2 - ) accumulation, biomass growth and S0 hydrolysis. The sensitivity analysis was aimed at verifying the model stability, understanding the model structure and individuating the model parameters to be further optimized. The mass specific area of the sulfur particles (a*) and hydrolysis kinetic constant (k1 ) were identified as the dominant parameters on the model outputs, i...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388085/effects-of-the-bottom-slope-and-guiding-wall-length-on-the-performance-of-a-vortex-drop-inlet
#14
Dong Sop Rhee, Yong Sung Park, Inhwan Park
Laboratory experiments were conducted to assess the performance of a vortex drop inlet with a spiral intake in subcritical and supercritical flow conditions. The water surface elevation at multiple locations was measured for different flowrates by varying the extent of the guiding wall and the longitudinal and radial bottom slopes. The measurements show that a steeper longitudinal bottom slope decreases the water surface elevation at the beginning of the intake, resulting in a transcritical flow in the intake structure...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388084/evaluating-of-heavy-metal-pollution-in-amir-kalayeh-wetland-using-geochemical-and-statistical-analyses
#15
Maryam Zare Khosheghbal, Marjan Esmaeilzadeh
Metal pollution in aquatic ecosystems has created concern due to its toxicity, environmental stability and ability to transfer into the food chain, and monitoring the metal source is one way to decrease the environmental impact. The present study aimed to investigate metal concentrations of Al, Fe, Mg, P, As, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, V and Zn, their spatial distribution, origin of the contaminants, contamination factor (CF), pollution load index (PLI), enrichment factor (EF), and geoaccumulation index (Igeo ) in surface sediments of the Amir-Kalayeh wetland...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388083/flocculation-performance-of-anionic-starch-in-oil-sand-tailings
#16
Nana Zhao, Hani Al Bitar, Yunyin Zhu, Yuming Xu, Zhiqing Shi
A series of carboxymethyl starches (CMSs), with various degrees of substitution from 0.1 to 0.79, were synthesized and selected as a model to study the feasibility of using natural polymers as flocculants for oil sand tailings treatment. The flocculation performance of modified CMS in kaolin clay suspensions and oil sand tailings was evaluated in terms of settling rate, solids content, capillary suction time, and specific resistance to filtration of the sediment phase. It was found that the synthesized CMS effectively accelerates settling of kaolin suspensions and oil sand fine tailings, thus demonstrating the feasibility of this application...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388082/removal-of-phenol-from-steel-wastewater-by-combined-electrocoagulation-with-photo-fenton
#17
Mohammad Malakootian, Mohammad Reza Heidari
Phenol and its derivatives are available in various industries such as refineries, coking plants, steel mills, drugs, pesticides, paints, plastics, explosives and herbicides industries. This substance is carcinogenic and highly toxic to humans. The purpose of the study was to investigate the removal of phenol from wastewater of the steel industry using the electrocoagulation-photo-Fenton (EC-PF) process. Phenol and chemical oxygen demand (COD) removal efficiency were investigated using the parameters pH, Fe2+ /H2 O2 , reaction time and current density...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388081/sludge-blanket-anaerobic-baffled-reactor-for-source-separated-blackwater-treatment
#18
Melesse Eshetu Moges, Daniel Todt, Eshetu Janka, Arve Heistad, Rune Bakke
The performance of a sludge blanket anaerobic baffled reactor was tested as an integrated treatment system for source-separated blackwater. The system consists of a stirred equalization tank, a buffer inlet tank, and two identical reactors, each with a working volume of 16.4 L, operated in parallel. Both reactors run at 3-days hydraulic retention time with different intermittent pulse feeding. Pulse lengths of 12 and 24 seconds per feed were set with respective rates of 114 L h-1 and 52 L h-1 for the short-pulse fed reactor (RI) and the long-pulse fed reactor (RII)...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30388080/prospects-in-bioelectrochemical-technologies-for-wastewater-treatment
#19
Simone Perazzoli, José P de Santana Neto, Hugo M Soares
Bioelectrochemical technologies are emerging as innovative solutions for waste treatment, offering flexible platforms for both oxidation and reduction reaction processes. A great variety of applications have been developed by utilizing the energy produced in bioelectrochemical systems, such as direct electric power generation, chemical production or water desalination. This manuscript provides a literature review on the prospects in bioelectrochemical technologies for wastewater treatment, including organic, nutrients and metals removal, production of chemical compounds and desalination...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30339547/effects-of-sulfamethoxazole-on-the-denitrifying-process-in-anoxic-activated-sludge-and-the-responses-of-denitrifying-microorganisms
#20
Yonglei An, Xueming Qin
The presence of antibiotics in municipal wastewater is bound to affect the anoxic denitrifying process in anoxic activated sludge (AAS). This study investigated the effects of sulfamethoxazole (SMZ) on the denitrifying process in AAS and the responses of denitrifying microorganisms. The results showed that SMZ could decrease the speed of nitrate removal significantly when the concentration of SMZ was lower than 10 mg/L, and the removal of nitrate would be completely inhibited when SMZ concentration was higher than 100 mg/L...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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