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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/28192368/erratum-water-science-and-technology-74-8-1845-1854-toward-an-operational-tool-to-simulate-green-roof-hydrological-impact-at-the-basin-scale-a-new-version-of-the-distributed-rainfall-runoff-model-multi-hydro-pierre-antoine-versini-et-al-doi-10-2166-wst-2016
#1
Pierre-Antoine Versini, Auguste Gires, Ioulia Tchiguirinskaia, Daniel Schertzer
No abstract text is available yet for this article.
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192367/the-occurrence-of-enhanced-biological-phosphorus-removal-in-a-200-000-m-3-day-partial-nitration-and-anammox-activated-sludge-process-at-the-changi-water-reclamation-plant-singapore
#2
Yeshi Cao, Bee Hong Kwok, Mark C M van Loosdrecht, Glen T Daigger, Hui Yi Png, Wah Yuen Long, Chua Seng Chye, Yahya A B D Ghani
Mainstream partial nitritation and Anammox (PN/A) has been observed and studied in the step-feed activated sludge process at the Changi water reclamation plant (WRP), which is the largest WRP (800,000 m(3)/d) in Singapore. This paper presents the study results for enhanced biological phosphorus removal (EBPR) co-existing with PN/A in the activated sludge process. Both the in-situ EBPR efficiency and ex-situ activities of phosphorus release and uptake were high. The phosphorus accumulating organisms were dominant, with little presence of glycogen accumulating organisms in the activated sludge...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192366/strategies-for-achieving-energy-neutrality-in-biological-nutrient-removal-systems-a-case-study-of-the-slupsk-wwtp-northern-poland
#3
Ewa Zaborowska, Krzysztof Czerwionka, Jacek Makinia
The paper presents a model-based evaluation of technological upgrades on the energy and cost balance in a large biological nutrient removal (BNR) wastewater treatment plant (WWTP) in the city of Slupsk (northern Poland). The proposed upgrades include chemically enhanced primary sludge removal and reduction of the nitrogen load in the deammonification process employed for reject water treatment. Simulations enabled to estimate the increased biogas generation and decreased energy consumption for aeration. The proposed upgrades may lead the studied WWTP from the energy deficit to energy neutrality and positive cost balance, while still maintaining the required effluent standards for nitrogen...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192365/zero-valent-metal-loaded-silica-nanoparticles-for-the-removal-of-tnt-from-water
#4
Harsha Mangal, Amit Saxena, Nivedita Shukla, P K Rai, A S Rawat, Vivek Kumar, Vatsana Gupta, Monika Datta
Silica nanoparticles with a surface area of 673.60 m(2)/g and particle size of 8-12 nm were prepared using aerogel process (AP) followed by super critical drying. Zero valent Fe, Co, Pt, and bimetallic Fe/Pt and Fe/Co were loaded using an incipient wetness impregnation technique and subsequent reduction. Scanning electron microscopy-energy dispersive X-ray (SEM-EDX) and transmission electron microscopy-energy dispersive X-ray (TEM-EDX) characterizations indicated fine dispersion of iron on AP-SiO2 +Fe system...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192364/membrane-technology-applied-to-acid-mine-drainage-from-copper-mining
#5
K Ambiado, C Bustos, A Schwarz, R Bórquez
The objective of this study is to evaluate the treatment of high-strength acid mine drainage (AMD) from copper mining by nanofiltration (NF) and reverse osmosis (RO) at pilot scale. The performances of two commercial spiral-wound membranes - NF99 and RO98pHt, both from Alfa Laval - were compared. The effects of pressure and feed flow on ion rejection and permeate flux were evaluated. The results showed high ion removal under optimum pressure conditions, which reached 92% for the NF99 membrane and 98% for the RO98pHt membrane...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192363/combined-risk-assessment-of-nonstationary-monthly-water-quality-based-on-markov-chain-and-time-varying-copula
#6
Wei Shi, Jun Xia
Water quality risk management is a global hot research linkage with the sustainable water resource development. Ammonium nitrogen (NH3-N) and permanganate index (CODMn) as the focus indicators in Huai River Basin, are selected to reveal their joint transition laws based on Markov theory. The time-varying moments model with either time or land cover index as explanatory variables is applied to build the time-varying marginal distributions of water quality time series. Time-varying copula model, which takes the non-stationarity in the marginal distribution and/or the time variation in dependence structure between water quality series into consideration, is constructed to describe a bivariate frequency analysis for NH3-N and CODMn series at the same monitoring gauge...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192362/forced-ammonia-stripping-from-livestock-wastewater-the-influence-of-some-physico-chemical-parameters-of-the-wastewater
#7
Giorgos Markou, Miranda Agriomallou, Dimitris Georgakakis
In highly alkaline aqueous solutions (pH >10), the main form of dissolved ammoniacal nitrogen is the unionized free ammonia. Free ammonia, being a gaseous molecule, is easily stripped out from the solution. Increasing wastewater pH is frequently used to force ammonia removal. Herein, the effect of the variation of some physico-chemical characteristics of liquid cattle wastewater on ammonia stripping was investigated. The results show that at pH 11.5, ammonia volatilization and consequently its removal through stripping, was not affected by the variation of total solids (1-10%), alkalinity (2,500-20,000 mg/L as CaCO3) and electrical conductivity (20-50 mS/cm), or by the alkali type (NaOH, KOH and Ca(OH)2) employed to increase pH...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192361/synthesis-and-performance-of-antifouling-and-self-cleaning-polyethersulfone-graphene-oxide-composite-membrane-functionalized-with-photoactive-semiconductor-catalyst
#8
Nadir Dizge, Hakan Gonuldas, Yasin Ozay, Hasan Ates, Kasim Ocakoglu, Ersan Harputlu, Saadet Yildirimcan, Ali Unyayar
This study was performed to synthesize membranes of polyethersulfone (PES) blended with graphene oxide (GO) and PES blended with GO functionalized with photoactive semiconductor catalyst (TiO2 and ZnO). The antifouling and self-cleaning properties of composite membranes were also investigated. The GO was prepared from natural graphite powder by oxidation method at low temperature. TiO2 and ZnO nanopowders were synthesized by anhydrous sol-gel method. The surface of TiO2 and ZnO nanopowders was modified by a surfactant (myristic acid) to obtain a homogeneously dispersed mixture in a solvent, and then GO was functionalized by loading with these metal oxide nanopowders...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192360/selective-fenton-like-oxidation-of-methylene-blue-on-modified-fe-zeolites-prepared-via-molecular-imprinting-technique
#9
Yuanyuan Zhang, Jiaobo Shang, Yanqun Song, Chuan Rong, Yinghui Wang, Wenyu Huang, Kefu Yu
A facile strategy to increase the selectivity of heterogeneous Fenton oxidation is investigated. The increase was reached by increasing selective adsorption of heterogeneous Fenton catalyst to a target pollutant. The heterogeneous Fenton catalyst was prepared by a two-step process. First, zeolite particles were imprinted by the target pollutant, methylene blue (MB), in their aggregations, and second, iron ions were loaded on the zeolite aggregations to form the molecule imprinted Fe-zeolites (MI-FZ) Fenton catalyst...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192359/using-numerical-simulation-of-a-one-stage-vertical-flow-wetland-to-optimize-the-depth-of-a-zeolite-layer
#10
Bernhard Pucher, Hernán Ruiz, Joëlle Paing, Florent Chazarenc, Pascal Molle, Guenter Langergraber
This simulation study investigates the treatment performance of a compact French vertical flow wetland using a zeolite layer in order to increase ammonium nitrogen removal. For the modelling exercise, the biokinetic model CW2D of the HYDRUS Wetland Module is used. The calibrated model is able to predict the effect of different depths of the zeolite layer on ammonium nitrogen removal in order to optimize the design of the system. For the model calibration, the hydraulic effluent flow rates as well as influent and effluent concentrations of chemical oxygen demand (COD) and NH4-N have been measured...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192358/enhancing-capacitive-deionization-technology-as-an-effective-method-for-water-treatment-using-commercially-available-graphene
#11
Derya Dursun, Selin Ozkul, Recep Yuksel, Husnu Emrah Unalan
In recent years, capacitive deionization (CDI) has been reported as one of the emerging technologies developed with the purpose of water desalination. This work is aimed at the integration of supercapacitor electrodes for efficient removal of ions from water, and thus to achieve an energy efficient, and cost-effective water treatment process. Our objective is to transfer the vast knowledge of supercapacitors and advanced materials in area of water treatment to enhance the knowledge of the CDI process. Towards the main purpose, graphene-based supercapacitor electrodes were developed from commercially available, cost-effective graphene and the use of these new materials for deionization was explored in detail...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192357/valorization-of-the-vicia-faba-mucilage-on-textile-wastewater-treatment-as-a-bio-flocculant-process-development-and-optimization-using-response-surface-methodology-rsm
#12
Feriel Bouatay, Nesrine Eljebsi, Sonia Dridi-Dhaouadi, Farouk Mhenni
The Vicia faba membranes are an abundant and a low cost product. In the present research paper, the extracted Vicia faba mucilage was tested as an eco-friendly flocculant for textile wastewater treatment. Its performance as flocculant, in decolorization, chemical oxygen demand (COD) removal and the concentration of total suspended solids was checked. The natural extracted product was characterized using infrared spectroscopy. The total sugars were determined in the extracted product. The effect study, followed by an optimization and modeling analysis, of some experimental parameters on the coagulation-flocculation performance, using Vicia faba mucilage (as a flocculant), combined with aluminum sulfate (as a coagulant), showed that the best conditions for the flocculation process were pH of the effluent about 7, flocculant dose about 6...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192356/evaluation-of-wet-air-oxidation-variables-for-removal-of-organophosphorus-pesticide-malathion-using-box-behnken-design
#13
Melike Isgoren, Erhan Gengec, Sevil Veli
This paper deals with finding optimum reaction conditions for wet air oxidation (WAO) of malathion aqueous solution, by Response Surface Methodology. Reaction conditions, which affect the removal efficiencies most during the non-catalytic WAO system, are: temperature (60-120 °C), applied pressure (20-40 bar), the pH value (3-7), and reaction time (0-120 min). Those were chosen as independent parameters of the model. The interactions between parameters were evaluated by Box-Behnken and the quadratic model fitted very well with the experimental data (29 runs)...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192355/enhancement-of-struvite-pellets-crystallization-in-a-full-scale-plant-using-an-industrial-grade-magnesium-product
#14
D Crutchik, N Morales, J R Vázquez-Padín, J M Garrido
A full-scale struvite crystallization system was operated for the treatment of the centrate obtained from the sludge anaerobic digester in a municipal wastewater treatment plant. Additionally, the feasibility of an industrial grade Mg(OH)2 as a cheap magnesium and alkali source was also investigated. The struvite crystallization plant was operated for two different periods: period I, in which an influent with low phosphate concentration (34.0 mg P·L(-1)) was fed to the crystallization plant; and period II, in which an influent with higher phosphate concentration (68...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192354/biosorptive-removal-of-malachite-green-from-aqueous-solution-using-chemically-modified-brown-marine-alga-sargassum-swartzii
#15
M Jerold, V Sivasubramanian
Sargassum swartzii, marine macro brown alga, showed a high malachite green (MG) biosorption capacity in batch mode of operation. The analytical evidence from Fourier transform infrared spectra confirmed the involvement of amine group in the biosorption of MG and electrostatic interaction type of mechanism was proposed to occur between the amine group of dye and the cationic MG dye solution. Scanning electron micrograph shows the morphological features and the attachment of dye onto the biosorbent. pH edge experiment shows that biosorption capacity was maximum at pH 10...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192353/removal-of-ammonium-and-heavy-metals-by-cost-effective-zeolite-synthesized-from-waste-quartz-sand-and-calcium-fluoride-sludge
#16
Qian Zhang, Bing Lin, Junming Hong, Chang-Tang Chang
This study focuses on the effectiveness of zeolite (10% CF-Z [0.5]) hydrothermally synthesized from waste quartz sand and calcium fluoride (CF) for ammonium ion and heavy metal removal. Zeolite was characterized through powder X-ray diffraction, Fourier-transform infrared spectroscopy, micromeritics N2 adsorption/desorption analysis, and field emission scanning electron microscopy. The effects of CF addition, Si/Al ratio, initial ammonium concentration, solution pH, and temperature on the adsorption of ammonium on 10% CF-Z (0...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192352/synthesis-of-a-novel-magnetic-polyacrylamide-coagulant-and-its-application-in-wastewater-purification
#17
Zheng Zhou, Aiqin Shan, Yuxia Zhao
In this study, a novel magnetic polyacrylamide (PAM) coagulant based on the core of magnetite (Fe3O4), with oleic acid serving as modifier and acrylamide as monomer, was synthesized to remove suspended solids in kaolin-suspended water. The composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermo gravimetric analysis and scanning electron microscopy. The results demonstrated that 82.8% of turbidity removal rate was obtained in 5 min of static settling in simulated kaolin-suspended water...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192351/application-of-coupled-zero-valent-iron-biochar-system-for-degradation-of-chlorobenzene-contaminated-groundwater
#18
Xu Zhang, Yanqing Wu
A novel iron-carbon micro-electrolysis system, bamboo-derived biochar coupled with zero-valent iron (ZVI), was investigated for chlorobenzene (CB)-contaminated groundwater removal. Influences of initial pH value, mass ratio of the ZVI/Biochar, initial CB concentration and ionic strength of the ZVI/Biochar micro-electrolysis were studied. The results indicated that the increase of initial pH led to the decrease of the CB removal efficiency. While the optimum mass ratio of ZVI to biochar was 2:1, the improved initial concentration and reaction time were 33...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192350/sludge-reduction-via-biodegradation-of-the-endogenous-residue-xe-experimental-verification-and-modeling
#19
Cheikh Fall, Ericka L Millan-Lagunas, Carlos Lopez-Vazquez, Christine Maria Hooijmans, Yves Comeau
The feasibility of sludge reduction via the XE biodegradation process was explored both experimentally and through modeling, where the main focus was on determining the value of the bE parameter (first order degradation of XE) from a continuous process. Two activated sludge (AS) systems (30 L) were operated in parallel with synthetic wastewater during 16 months: a conventional activated sludge (CAS) system and a modified low-sludge production activated sludge (LSP-AS) process equipped with a side-stream digester unit (DU)...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28192349/development-of-a-model-for-activated-sludge-aeration-systems-linking-air-supply-distribution-and-demand
#20
Oliver Schraa, Leiv Rieger, Jens Alex
During the design of a water resource recovery facility, it is becoming industry practice to use simulation software to assist with process design. Aeration is one of the key components of the activated sludge process, and is one of the most important aspects of modelling wastewater treatment systems. However, aeration systems are typically not modelled in detail in most wastewater treatment process modelling studies. A comprehensive dynamic aeration system model has been developed that captures both air supply and demand...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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