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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/27858807/studies-on-competitive-adsorption-of-dyes-onto-carbon-xc-72-and-regeneration-of-adsorbent
#1
Xiang Xing, Hongxia Qu, Peng Chen, Bin Chi, Huifang Xie
Carbon as an adsorbent has been widely studied for wastewater treatment, but the regeneration of adsorbent has been scarcely reported. In this paper, an economical and environmental method was applied to regenerate carbon (XC-72). Results showed that both anhydrous ethanol and deionized water did not obtain optimal effect for the desorption of Acid Orange 7, Ponceau 2R and Rhodamine B, but the desorption effect was dramatically improved when anhydrous ethanol and deionized water were mixed in a certain volume ratio...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858806/simultaneous-uv-vis-spectrophotometric-quantification-of-ternary-basic-dye-mixtures-by-partial-least-squares-and-artificial-neural-networks
#2
Seyed Karim Hassaninejad-Darzi, Mohammad Torkamanzadeh
One of the main difficulties in quantification of dyes in industrial wastewaters is the fact that dyes are usually in complex mixtures rather than being pure. Here we report the development of two rapid and powerful methods, partial least squares (PLS-1) and artificial neural network (ANN), for spectral resolution of a highly overlapping ternary dye system in the presence of interferences. To this end, Crystal Violet (CV), Malachite Green (MG) and Methylene Blue (MB) were selected as three model dyes whose UV-Vis absorption spectra highly overlap each other...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858805/degradation-of-reactive-yellow-x-rg-by-o3-fenton-system-response-surface-approach-reaction-mechanism-and-degradation-pathway
#3
Yongjun Shen, Qihui Xu, Jun Liang, Wei Xu
O3/Fenton for the treatment of effluent containing Reactive Yellow X-RG is investigated. The response surface methodology is applied to study the main and interactive effects of the parameters. With the initial dye concentration being controlled at 300 mg L(-1), the optimized conditions for wastewater treatment are 3.68, 29.19 and 18.49 mg min(-1) for initial pH, mole ratio of [H2O2]/[Fe(2+)] and ozone dosage, respectively. The regression quadratic model well describing the degradation efficiency of O3/Fenton process is developed and validated by the analysis of variances, respectively...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858804/pollutant-removal-characteristics-of-a-two-influent-line-bnr-process-performing-denitrifying-phosphorus-removal-role-of-sludge-recycling-ratios
#4
Hongbo Liu, Feng Leng, Piao Chen, Stephan Kueppers
This paper studied denitrifying phosphorus removal of a novel two-line biological nutrient removal process treating low strength domestic wastewater under different sludge recycling ratios. Mass balance of intracellular compounds including polyhydroxyvalerate, polyhydroxybutyrate and glycogen was investigated together with total nitrogen (TN) and total phosphorus (TP). Results showed that sludge recycling ratios had a significant influence on the use of organics along bioreactors and 73.6% of the average removal efficiency was obtained when the influent chemical oxygen demand (COD) ranged from 175...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858803/efficient-removal-of-indigo-carmine-dye-by-a-separation-process
#5
Simona Caprarescu, Alexandra Raluca Miron, Violeta Purcar, Anita-Laura Radu, Andrei Sarbu, Daniela Ion-Ebrasu, Leonard-Ionuţ Atanase, Marius Ghiurea
This study is aimed at developing an innovative approach for Indigo Carmine dye removal from synthetic solutions by electrodialysis, carried out using ion exchange membranes. The batch electrodialysis system was operated at various current intensities: 0.05, 0.1 and 0.15 A. The pH and conductivity of solutions were measured before and after using electrodialysis process. The colour removal efficiency (CR %) was determined by spectrographic analysis and the energy consumption (EC) was calculated. The obtained results show that the pH of treated solution increases due to the increase in solution conductivity...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858802/a-two-step-approach-for-copper-and-nickel-extracting-and-recovering-by-emulsion-liquid-membrane
#6
Qiang Bi, Juanqin Xue, Yingjuan Guo, Guoping Li, Haibin Cui
The recycling of copper and nickel from metallurgical wastewater using emulsion liquid membrane (ELM) was studied. P507 (2-ethylhexyl phosphonic acid-2-ethylhexyl ester) and TBP (tributyl phosphate) were used as carriers for the extraction of copper and nickel by ELMs, respectively. The influence of four emulsion composition variables, namely, the internal phase volume fraction (ϕ), surfactant concentration (Wsurf), internal phase stripping acid concentration (Cio) and the carrier concentration (Cc), and the process variable treat ratio on the extraction efficiencies of copper or nickel were studied...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858801/study-on-the-effects-of-soluble-microbial-product-on-phosphate-adsorption-onto-fresh-hydrous-ferric-oxides-by-surface-complexation-models
#7
Yanpeng Mao, Wenlong Wang, Chunyuan Ma
As one of the major soluble organic compounds in membrane bioreactors, soluble microbial product (SMP) can combine the surface sites on hydrous ferric oxides (HFO), which can compete with HFO for the uptake of phosphate. In this study, SMP was extracted from an MBR plant with long-term stable operation, and the effects of SMP on phosphate adsorption onto fresh HFO (FHFO) were investigated at pH values of 6.0 and 7.8 in a two-phase system composed of FHFO (solid phase) and SMP/phosphate (liquid phase). The phosphate adsorption capacity of FHFO was found to decrease significantly with increase in the pH value and SMP concentration...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858800/removal-of-methylene-blue-by-adsorption-on-aluminosilicate-waste-equilibrium-kinetic-and-thermodynamic-parameters
#8
Carlos Alberto Policiano Almeida, Tânia Marina Palhano Zanela, Clodoaldo Machado, Juan Antônio Altamirano Flores, Luiz Fernando Scheibe, Nicholas P Hankins, Nito Angelo Debacher
An aluminosilicate waste (AW) was investigated as adsorbent for methylene blue (MB) dye. AW was characterized by petrography, X-ray diffractometry, X-ray fluorescence, scanning electron microscopy, thermogravimetry and zeta potential measurements. It was found that AW contains kaolinite, and other minor components such as quartz, muscovite, smectite, siderite, pyrite and organic compounds. The chemical composition of AW is mainly SiO2 (49%) and Al2O3 (23%) and it has negative superficial charge above pH 1.73...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858799/a-study-on-fluorescence-properties-of-carboxymethyl-quaternary-ammonium-oligochitosan-and-its-performances-as-a-tracing-agent
#9
Huixin Zhang, Luping Zhao, Dongxue Sun, Zhiyue Cai, Jie Zhang, Xu Han, Xiaohui Guo, Manli Cui, Duanduan Xie
Carboxymethyl-quaternary ammonium oligochitosan (CM-QAOC) exhibited high inhibition to scaling and microbial formation and also remarkable fluorescence. In this paper its fluorescent properties and application as a fluorescent tracing chemical for industrial water treatment were studied in detail. The fluorescence intensities of CM-QAOC were in good linear agreement with its content in the concentration range of 5 to 500 mg/L and in the range of pH 7 to 9, which shows CM-QAOC can trace itself directly. The results showed the fluorescence would not be influenced by common phosphorus-containing organic and inorganic water treatment chemicals and N-dodecyl-N,N-dimethyl-benzenemethanaminium chloride...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858798/heterogeneous-fenton-like-discoloration-of-organic-dyes-catalyzed-by-porous-schorl-ceramisite
#10
Huan-Yan Xu, Hang Zhao, Nan-Ping Cao, Qi Liu, Shu-Yan Qi
Due to the difficult separation of superfine schorl powder (SSP) from solution after being used, millimetre-scale porous schorl ceramisite (PSC) was obtained through solid-phase sintering method and used as a heterogeneous catalyst for Fenton-like discoloration of organic dyes. SSP and PSC were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The results demonstrated that both SSP and PSC were mainly composed of schorl and there existed large amounts of micropores on the surface of PSC...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858797/assessment-of-organic-micropollutants-occurrence-in-treated-wastewater-using-heat-shock-protein-47-stress-responses-in-chinese-hamster-ovary-cells-and-gc-ms-based-non-target-screening
#11
Selma Etteieb, Atsushi Kawachi, Junkyu Han, Foued Elayni, Jamila Tarhouni, Hiroko Isoda
Combining bioassays and analytical chemistry screening is a powerful approach to assess organic micropollutants which are the main contributors to toxic potential in complex mixtures of treated wastewater (TWW). The aim of this study was to perform a comprehensive toxicity assessment of treated effluents using stress response bioassays and then to assess the occurrence of the organic micropollutants which were responsible for this biological response using gas chromatography coupled with a mass spectrometry detector (GC/MS)...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858796/influence-of-hydraulic-retention-time-on-the-psychrophilic-hydrolysis-acidogenesis-of-proteins
#12
Paola Poirrier, María Cristina Schiappacasse, Marta Carballa, Juan M Lema
The influence of the hydraulic retention time (HRT) on the anaerobic hydrolysis of complex substrates has been studied under psychrophilic conditions. For this purpose, a continuous stirred tank reactor was operated at 15 °C and neutral pH and gelatin was considered as a model protein. Three HRTs have been tested: 12, 21 and 36 h. Gelatin hydrolysis was greatly dependent on HRT, increasing from 40% at 12 h-HRT to a maximum of 65% at 36 h-HRT. Molecular size distribution analyses of the effluent showed that hydrolysation of compounds larger than 10 kDa was poor at 12 h-HRT, whereas the fraction of 1-10 kDa was completely transformed into compounds smaller than 1 kDa...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858795/effect-of-acetic-acid-in-recycling-water-on-ethanol-production-for-cassava-in-an-integrated-ethanol-methane-fermentation-process
#13
Xinchao Yang, Ke Wang, Jianhua Zhang, Lei Tang, Zhonggui Mao
Recently, the integrated ethanol-methane fermentation process has been studied to prevent wastewater pollution. However, when the anaerobic digestion reaction runs poorly, acetic acid will accumulate in the recycling water. In this paper, we studied the effect of low concentration of acetic acid (≤25 mM) on ethanol fermentation at different initial pH values (4.2, 5.2 or 6.2). At an initial pH of 4.2, ethanol yields increased by 3.0% and glycerol yields decreased by 33.6% as the acetic acid concentration was increased from 0 to 25 mM...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858794/influence-of-the-fetch-parameter-on-results-from-empirical-correlations-for-estimating-odorous-emissions-at-passive-liquid-surfaces
#14
Ademir A Prata, Milena J Calvo, Gaetano Boncardo, Eric C Sivret, Jane M Santos, Victoria Timchenko, Richard M Stuetz
Passive liquid surfaces in wastewater treatment plants may be potential sources of odorous emissions. This study investigates the occurrence and significance of deviations that may originate from the use of the effective diameter as fetch parameter in the empirical correlations utilised by the WATER9 model to estimate odorous emissions at passive liquid surfaces. A sensitivity analysis was performed using benzene as a model compound and considering representative conditions of wind speed and wind alignment...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858793/photocatalytic-degradation-of-rhodamine-b-paracetamol-and-diclofenac-sodium-by-supported-titania-based-catalysts-from-petrochemical-residue-effect-of-doping-with-magnesium
#15
William Leonardo da Silva, Marla Azário Lansarin, João Henrique Z Dos Santos, Fernando Silveira
Three different lots of a residual Ziegler-Natta catalyst slurry (bearing Ti and Mg) obtained from an industrial petrochemical plant were employed as sources for the photocatalyst supported on silica. The effect of additional magnesium (1.0-25.0 wt% Mg/SiO2) on the photocatalytic properties of the doped materials was investigated. Doping the titania-based photocatalyst with Mg results in a shift in the absorption threshold toward the visible spectrum. The optical band gap energy of the bare supported photocatalyst was in the range of 2...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858792/effects-of-carriers-on-nutrient-removal-and-membrane-fouling-in-combined-process-of-inclined-plates-hydrolytic-tank-and-membrane-bioreactor
#16
Xin Li, Yali Liu, Mingxing Chu, Aimin Liu
A novel process, inclined-plates hydrolytic tank (IHT) and membrane bioreactor (MBR), was used to treat domestic sewage continuously. In this study, the effects of carriers' addition on operational performances of IHT-MBR were studied at the hydraulic retention time of 5.4 h and the recycling rate of 200%. Experimental results indicated the removal efficiencies of chemical oxygen demand, total nitrogen and total phosphorus reached 86.8%, 82.9% and 89.6%, respectively, corresponding trans-membrane pressure decreased to 1...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858791/preparation-characterization-and-application-of-activated-carbon-from-low-cost-material-for-the-adsorption-of-tetracycline-antibiotic-from-aqueous-solutions
#17
Afshin Takdastan, Amir Hossein Mahvi, Eder C Lima, Mohammad Shirmardi, Ali Akbar Babaei, Gholamreza Goudarzi, Abdolkazem Neisi, Mohammad Heidari Farsani, Mehdi Vosoughi
In this study, a new zinc chloride (ZnCl2) impregnated activated carbon (Zn-AC) was prepared from oak charcoals as low-cost material and used as adsorbent for tetracycline (TC) adsorption. The Zn-AC was characterized using field emission-scanning electron microscope, powder X-ray diffraction, and CHNS-O analyses. Specific surface area of the adsorbent was also measured using the Brunauer, Emmett and Teller (BET) isotherm model. The TC adsorption onto the Zn-AC was investigated as a function of solution pH, adsorbent dosage, and inorganic cations (Li(+), K(+), Mg(2+), Ca(2+), Ni(2+), and Fe(3+)) and anions (HCO3(-), NO3(-) and SO4(2-)) that could interfere in the adsorption of TC...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858790/lost-in-calibration-why-people-still-do-not-calibrate-their-models-and-why-they-still-should-a-case-study-from-urban-drainage-modelling
#18
Franz Tscheikner-Gratl, Peter Zeisl, Carolina Kinzel, Johannes Leimgruber, Thomas Ertl, Wolfgang Rauch, Manfred Kleidorfer
From a scientific point of view, it is unquestioned that numerical models for technical systems need to be calibrated. However, in sufficiently calibrated models are still used in engineering practice. Case studies in the scientific literature that deal with urban water management are mostly large cities, while little attention is paid to the differing boundary conditions of smaller municipalities. Consequently, the aim of this paper is to discuss the calibration of a hydrodynamic model of a small municipality (15,000 inhabitants)...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858789/microwave-synthesis-of-pure-and-doped-cerium-iv-oxide-ceo2-nanoparticles-for-methylene-blue-degradation
#19
W M A El Rouby, A A Farghali, A Hamdedein
Cerium (IV) oxide (CeO2), samarium (Sm) and gadolinium (Gd) doped CeO2 nanoparticles were prepared using microwave technique. The effect of microwave irradiation time, microwave power and pH of the starting solution on the structure and crystallite size were investigated. The prepared nanoparticles were characterized using X-ray diffraction, FT-Raman spectroscopy, and transmission electron microscope. The photocatalytic activity of the as-prepared CeO2, Sm and Gd doped CeO2 toward degradation of methylene blue (MB) dye was investigated under UV light irradiation...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27858788/valorization-of-romanian-silver-fir-tree-bark-abies-alba-mill-wastes-as-low-cost-sorbent-of-cu-ii-ions-from-polluted-waters
#20
Lavinia Tofan, Carmen Paduraru, Roxana Laura Mihailescu Amalinei, Ion Bunia, Anca Miron
Considering recycling as the first option in the hierarchy of sustainable waste management, and also the demand for efficient processes for wastewater treatment with reduced costs, the potential applicability of Romanian Abies alba bark, the main waste from the industrial processing of the wood of mature silver fir trees, as sorbent for Cu(II) has been studied in batch conditions. It was observed that the extent of Cu(II) sorption is strongly dependent on initial solution pH, sorbent dose, initial Cu(II) ion concentration, temperature and contact time...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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