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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/30629550/ms2-coliphage-and-e-coli-uvb-inactivation-rates-in-optically-clear-water-dose-dose-rate-and-temperature-dependence
#1
Yu Lian, Lei Mai, Nancy Cromar, Neil Buchanan, Howard Fallowfield, Xiaoming Li
Natural ultraviolet irradiance disinfection is known to play a significant role in both natural wastewater treatment systems and drinking water disinfection processes, while the influence of ultraviolet B (UVB) delivering method on sunlight disinfection outcome is still unclear. This study aims to determine the effects of environmentally relevant temperatures, UVB doses (J m-2 ) and dose rates (W m-2 ) on the inactivation and log reduction values (LRVs) of the F-RNA coliphage MS2 and Escherichia coli in optically clear water...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629549/degradation-of-cyanide-aniline-and-phenol-in-pre-treated-coke-oven-wastewater-by-peroxide-assisted-electro-oxidation-process
#2
Hariraj Singh, Brijesh Kumar Mishra
The present study explored the feasibility of using graphite electrodes for the electrochemical oxidation of cyanide, thiocyanate, phenol and aniline with hydrogen peroxide. The dosing effects of hydrogen peroxide and current density were examined in the pre-treated coke oven wastewater. It was found that 0.025 M hydrogen peroxide and 13.63 mA/cm2 of current density were more favorable for the removal of 100%, 90%, 71% and 40% cyanide, thiocyanate, phenol and aniline respectively. The increased removal of phenol in the coke oven wastewater was attributed to the pre-treatment of wastewater...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629548/proof-of-concept-of-wastewater-treatment-via-passive-aeration-snd-using-a-novel-zeolite-amended-biofilm-reactor
#3
Liang Cheng, Raphael Marie-Guillaume Flavigny, Md Iqbal Hossain, Wipa Charles, Ralf Cord-Ruwisch
The current paper describes a novel passive aeration simultaneous nitrification and denitrification (PASND) zeolite amended biofilm reactor that removes organic carbon and nitrogen from wastewater with low-energy consumption. Next to the ammonium oxidizing bacteria (AOB), this reactor contained naturally enriched glycogen accumulating organisms (GAOs) and zeolite powder to initially adsorb BOD (acetate) and ammonium (NH4 + -N) from synthetic wastewater under anaerobic conditions. Draining of the treated wastewater exposed the biofilm directly to air enabling low-energy oxygen supply by passive aeration...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629547/full-scale-practice-of-domestic-wastewater-source-separation-and-collection-in-a-semicentralized-treatment-system-a-case-study
#4
Xueli Ren, Hongbin Chen, Yong Cheng, Luxue Wu, Haixin Jiang
Semicentralized supply and treatment systems (SCSTSs), which can realize water, nutrition, and energy recycling via separate water supply and discharge systems, have been developed for fast-growing urban areas. The world's first full-scale SCSTS was implemented in Qingdao in China. Greywater (GW) and blackwater (BW) are collected and treated separately, but the parallel setting of the BW and GW pipelines means that connection mistakes can easily occur. Taking Qingdao as an example, this article analyzes the occurrences of BW and GW pipeline misconnections and the changes in influent pollutants, to assess the feasibility of separating domestic sewage at the source...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629546/initial-ph-and-k-concentrations-jointly-determine-the-types-of-biogenic-ferric-hydroxysulfate-minerals-and-their-effect-on-adsorption-removal-of-cr-vi-in-simulated-acid-mine-drainage
#5
Yongwei Song, Jianyu Zhang, Heru Wang
It is of practical significance to promote the transformation of Fe in acid mine drainage (AMD) into ferric hydroxysulfate minerals with strong ability to remove heavy metals or metalloids. To investigate the types of biogenic ferric hydroxysulfate minerals generated in AMD by Acidithiobacillus ferrooxidans (A. ferrooxidans), different pH and K+ concentrations are tested for the formation of precipitates in media containing 160 mmol/L Fe2+ . The Cr(VI) removal efficiencies of ferric hydroxysulfate minerals in AMD with different acidities are also compared...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629545/removal-of-cr-vi-by-magnetic-fe-c-crosslinked-nanoparticle-for-water-purification-rapid-contaminant-removal-property-and-mechanism-of-action
#6
Runhua Chen, Ping Wang, Meng Li, Fei Tian, Jiangjun Xiao, Xinxi Fu, Chunlian Ding, Yan Shi
In this study, a novel method based on the magnetic Fe/C crosslinked nanoparticles (MNZVI/CNTs-OH) is reported for the effective removal of Cr(VI) in aqueous solutions. Parameters that influence the effectiveness of the nanoparticles, such as pH, temperature, reaction time, and particle dosage, was analyzed. It was found that MNZVI/CNTs-OH particles exhibit significantly higher activity toward Cr(VI) removal than bare NZVI, carbon nanotubes (CNTs), and other synthetic nanomaterials. Under optimized conditions, the removal efficiency of Cr(VI) by MNZVI/CNTs-OH is up to 98% with an initial contaminant concentration of 50 mg/L, and chromium content in the residue up to 48 mg/g...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629544/preparation-of-cofe-2-o-4-activated-carbon-chitosan-as-a-new-magnetic-nanobiocomposite-for-adsorption-of-ciprofloxacin-in-aqueous-solutions
#7
Mohammad Malakootian, Alireza Nasiri, Hakimeh Mahdizadeh
Ciprofloxacin (CIP) is considered as a biological resistant pollutant. The CoFe2 O4 /activated carbon@chitosan (CoFe2 O4 /AC@Ch) prepared as a new magnetic nanobiocomposite and used for adsorption of CIP. CoFe2 O4 /AC@Ch was characterized by Fourier transform-infrared (FT-IR), field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), vibrating-sample magnetometer (VSM), and Brunauer-Emmett-Teller (BET) surface area measurements. The pHZPC value of the nanobiocomposite was estimated to be 6...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629543/the-combination-of-novel-airlift-magnetic-separation-loop-system-and-an-efficient-biosorbent-for-the-removal-of-pb-ii-from-aqueous-solution
#8
Xiaolei Li, Huidong Li, Lin Zhang, Kaili Huo, Zhexin Zhang, Jing Li, Hui Xu
An efficient biosorbent containing magnetic nanoparticles, walnut shell powder, foam, and alginate (AMWSF) was prepared and used in Pb(II) removal. The adsorption process was performed in an airlift magnetic separation loop system. Optimum adsorption conditions were tested at pH 3-7, biomass dose of 0.03-0.4 g, temperature of 15-35 °C, initial Pb(II) ion concentration of 50-400 mg·L-1 , and contact time of 10-480 min. The equilibrium adsorption capacity reached up to 69.45 mg·g-1 . The physicochemical properties of AMWSF were analyzed by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629542/detection-of-the-efficiency-of-microwave-oxidation-process-for-meat-industry-wastewater-by-dielectric-measurement
#9
Zoltán Jákói, Cecilia Hodúr, Zsuzsanna László, Sándor Beszédes
Our experimental work focused on the applicability of a quite novel process for wastewater treatment, i.e. a microwave (MW) irradiation-enhanced Fenton-like method. The aim of our research was to detect and evaluate the efficiency of this oxidation process, during the treatment of meat industry wastewater containing a high concentration of organic material. The efficiency was defined by the measurement of the change in COD (chemical oxygen demand, with an initial COD value of 1,568 mg L-1 ), and with the determination of dielectric parameters during the process...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629541/production-of-free-radicals-by-the-co-2-oxone-system-to-carry-out-diclofenac-degradation-in-aqueous-medium
#10
Oscar M Rodríguez-Narváez, Oracio Serrano-Torres, Kazimierz Wrobel, Enric Brillas, Juan M Peralta-Hernandez
This paper reports the degradation of a solution of 0.314 mM diclofenac (DCF), while using 5-15 mM Oxone as oxidizing agent with the catalytic action of 0.05-0.2 mM Co2+ . The best performance was obtained for 10 mM Oxone and 0.2 mM Co2+ , achieving the total DCF abatement and 77% removal of chemical oxygen demand after 30 min. Oxidizing of sulfate (SO4 •- ) and hydroxyl (•OH) radicals was formed by the Co2+ /Oxone system. Oxone was firstly oxidized to persulfate ion that was then quickly converted into the above free radicals...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629540/recent-advances-in-bio-p-modelling-a-new-approach-verified-by-full-scale-observations
#11
Erika Varga, Hélène Hauduc, James Barnard, Patrick Dunlap, Jose Jimenez, Adrienne Menniti, Peter Schauer, Carlos M Lopez Vazquez, April Z Gu, Mathieu Sperandio, Imre Takács
This paper summarizes recent developments in biological phosphorus removal modelling, with special attention to side-stream enhanced biological phosphorus removal (S2EBPR) systems on which previous models proved to be ineffective without case-by-case parameter adjustments. Through the research and experience of experts and practitioners, a new bio-kinetic model was developed including an additional group of biomass (glycogen accumulating organisms - GAOs) and new processes (such as aerobic and anoxic maintenance for PAO and GAO; enhanced denitrification processes; fermentation by PAOs which - along with PAO selection - is driven by oxidation-reduction potential (ORP))...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629539/control-of-sludge-settleability-based-on-organic-load-and-ammonia-nitrogen-load-under-low-dissolved-oxygen
#12
Wei Han, Zhaoxu Peng, Tingmei Li, Pengyu Fan, Luji Yu
Controlling dissolved oxygen (DO) at low level can save energy for wastewater treatment plants (WWTPs), but it is easy to induce filamentous sludge bulking. Through establishing the kinetic equation of sludge settleability, ammonia nitrogen (NH4 + -N) load and organic load (food-to-microbe ratio, F/M), the mechanism of the competitive relationship between filamentous and floccular bacteria under low DO was analyzed. The results showed when DO, NH4 + -N load and F/M were in the range of 0.15-0.35 mg/L, 0.035-0...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629538/evaluation-of-the-accuracy-of-two-simple-methods-for-microscopic-activated-sludge-analysis
#13
Mateusz Sobczyk, Agnieszka Pajdak-Stós, Edyta Fiałkowska, Wioleta Kocerba-Soroka, Joanna Starzycka-Giża, Janusz Fyda
Biological microscopic analysis is a popular method employed in wastewater treatment plants worldwide for evaluating activated sludge condition. However, many operators still have reservations regarding its reliability. In this study, we evaluated and compared two methods of microscopic sludge investigation: the sludge index (SI) and the Eikelboom-van Buijsen method (EB). We investigated 79 activated sludge samples from nine treatment plants located in southern Poland over a 1-year period. For each sample, sludge volume index values were calculated and compared with the results of evaluation made on the basis of microscopic analysis...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629537/mechanism-of-aniline-adsorption-on-post-crosslinked-resins-pore-structure-and-oxygen-content
#14
Wenhao Yu, Chao Xu, Chai Yin, Shitao Yu, Weizhi Sun, Congxia Xie, Mo Xian
A series of post-crosslinked resins were synthesized from macroporous chloromethylated styrene-divinylbenzene copolymer by controlling post-crosslinked reaction conditions. Adsorption study towards aniline showed that the three resins, ST-DVB-WH5, ST-DVB-WH6, and ST-DVB-WH7, prepared at different temperatures, and which had nearly identical static adsorption capacity, displayed great disparity in kinetic behavior. The rate constant of ST-DVB-WH7 by the pseudo-first-order model was 1.50 and 1.19 times higher than that of ST-DVB-WH5 and ST-DVB-ST-DVB-WH6...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629536/degradation-of-acetaminophen-in-aqueous-solution-by-uv-and-uv-activated-sludge-processes
#15
Bingjie Xu, Guoyan Zhan, Bin Xu, Haijie Du, Hang Luo, Tianfeng Wang, Changchao Zhan, Yi Yang
Acetaminophen (N-acetyl-p-aminophenol, APAP) is one of the most common antipyretic analgesics used to treat common ailments throughout the world. Recently, APAP has been frequently detected in wastewater effluent and groundwater, resulting in potential risks to the environment. Current methods for eliminating APAP are complicated and cost-prohibitive. This study examined APAP degradation by ultraviolet-C (UV-C) and UV-C irradiation combined with activated sludge (UV/AS) to evaluate potential applications in wastewater treatment...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629535/fluid-dynamics-in-a-full-scale-flat-sheet-mbr-an-experimental-and-numerical-study
#16
Lasse Sørensen, Thomas Ruby Bentzen
Fluid dynamics is used for fouling mitigation in membrane bioreactors (MBRs), whereby a proper understanding of the fluid dynamics is of great interest. The influence of fluid dynamics has led to the use of computational fluid dynamics for optimizing MBR systems. In this work, a model has been validated for flat sheet membranes, with use of the Eulerian multiphase method. The model is validated against a comparable setup where the liquid velocities are measured with a laser Doppler anemometer (LDA). Furthermore, the Eulerian multiphase approach is validated against the more numerical direct volume of fluid (VOF) approach with sludge properties for the liquid, resulting in an error between the models of less than 2% for the wall shear stresses...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629534/wastewater-treatment-plant-performance-analysis-using-artificial-intelligence-an-ensemble-approach
#17
Vahid Nourani, Gozen Elkiran, S I Abba
In the present study, three different artificial intelligence based non-linear models, i.e. feed forward neural network (FFNN), adaptive neuro fuzzy inference system (ANFIS), support vector machine (SVM) approaches and a classical multi-linear regression (MLR) method were applied for predicting the performance of Nicosia wastewater treatment plant (NWWTP), in terms of effluent biological oxygen demand (BODeff ), chemical oxygen demand (CODeff ) and total nitrogen (TNeff ). The daily data were used to develop single and ensemble models to improve the prediction ability of the methods...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629533/comparison-of-novel-ziziphus-lotus-adsorbent-and-industrial-carbon-on-methylene-blue-removal-from-aqueous-solutions
#18
Asmaa Msaad, Mounir Belbahloul, Samir El Hajjaji, Abdeljalil Zouhri
In this work, the use of a novel low-cost adsorbent derived from Ziziphus lotus (ZL) and industrial carbon (IC) has been successfully applied to the removal of methylene blue (MB) from aqueous solutions. The efficiency of this material was studied through Lagergren pseudo-first-order and pseudo-second-order kinetic models. The process for the novel activated carbon and the IC were best represented by the pseudo-second-order rate model. Langmuir and Freundlich isotherms were used to describe the sorption equilibrium data...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629532/pollution-characteristics-and-fate-of-microfibers-in-the-wastewater-from-textile-dyeing-wastewater-treatment-plant
#19
Xia Xu, Qingtong Hou, Yingang Xue, Yun Jian, LiPing Wang
Wastewater discharged from wastewater treatment plants (WWTPs) is suspected to be a significant contributor of microplastics (MPs) to the environment, and fiber is the main shape of MPs in wastewater effluent. A typical textile industry WWTP with 30,000 tons of daily treatment capacity was sampled for microfibers at different stages of the treatment process to ascertain at what stage in the treatment process the microfibers are being removed. The average abundance of microfibers was 334.1 (±24.3) items/litre in influent, and it reduced to 16...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30629531/dynamics-of-dissolved-organic-matter-in-a-wastewater-effluent-impacted-japanese-urban-stream-characteristics-occurrence-and-photoreactivity-of-fluorescent-components
#20
Kenshi Sankoda, Chieko Yamamoto, Kazuhiko Sekiguchi, Jun Kobayashi, Qingyue Wang
We report the results of using the excitation-emission matrix (EEM) method combined with parallel factor analysis (PARAFAC) to investigate the characteristics and occurrence of dissolved organic matter (DOM) in an urban stream impacted by effluent from a wastewater treatment plant (WWTP). The PARAFAC model divides the bulk EEM spectra into six individual fluorescent components with three humic-like components (C1-C3), two protein-like components (C4 and C5) and a wastewater-derived component (C6). In general, intensities of fluorescent components are abundant in WWTP effluent impacted samples, thus showing that such an effluent is a major source of DOM in urban rivers, but C5 is considered to have autochthonous sources within the stream...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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