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Water Research

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https://www.readbyqxmd.com/read/28340418/enantioselective-reductive-transformation-of-climbazole-a-concept-towards-quantitative-biodegradation-assessment-in-anaerobic-biological-treatment-processes
#1
Monica Brienza, Serge Chiron
An efficient chiral method-based using liquid chromatography-high resolution-mass spectrometry analytical method has been validated for the determination of climbazole (CBZ) enantiomers in wastewater and sludge with quantification limits below the 1 ng/L and 2 ng/g range, respectively. On the basis of this newly developed analytical method, the stereochemistry of CBZ was investigated over time in sludge biotic and sterile batch experiments under anoxic dark and light conditions and during wastewater biological treatment by subsurface flow constructed wetlands...
March 21, 2017: Water Research
https://www.readbyqxmd.com/read/28340417/interfacial-interactions-between-skeletonema-costatum-extracellular-organic-matter-and-metal-oxides-implications-for-ceramic-membrane-filtration
#2
Noor Zaouri, Leonardo Gutierrez, Laure Dramas, Daniel Garces, Jean-Philippe Croue
In the current study, the interfacial interactions between the high molecular weight (HMW) compounds of Skeletonema costatum (SKC) extracellular organic matter (EOM) and ZrO2 or Al2O3, were investigated by atomic force microscopy (AFM). HMW SKC-EOM was rigorously characterized and described as a hydrophilic organic compound mainly comprised of polysaccharide-like structures. Lipids and proteins were also observed, although in lower abundance. HMW SKC-EOM displayed attractive forces during approaching (i.e., leading to jump-to-contact events) and adhesion forces during retracting regime to both metal oxides at all solution conditions tested, where electrostatics and hydrogen bonding were suggested as dominant interacting mechanisms...
March 21, 2017: Water Research
https://www.readbyqxmd.com/read/28340416/nonradical-oxidation-from-electrochemical-activation-of-peroxydisulfate-at-ti-pt-anode-efficiency-mechanism-and-influencing-factors
#3
Haoran Song, Linxia Yan, Jun Ma, Jin Jiang, Guangqiang Cai, Wenjuan Zhang, Zhongxiang Zhang, Jiaming Zhang, Tao Yang
Electrochemical activation of peroxydisulfate (PDS) at Ti/Pt anode was systematically investigated for the first time in this work. The synergistic effect produced from the combination of electrolysis and the addition of PDS demonstrates that PDS can be activated at Ti/Pt anode. The selective oxidation towards carbamazepine (CBZ), sulfamethoxazole (SMX), propranolol (PPL), benzoic acid (BA) rather than atrazine (ATZ) and nitrobenzene (NB) was observed in electrochemical activation of PDS process. Moreover, addition of excess methanol or tert-butanol had negligible impact on CBZ (model compound) degradation, demonstrating that neither sulfate radical (SO4(-)) nor hydroxyl radical (HO) was produced in electrochemical activation of PDS process...
March 21, 2017: Water Research
https://www.readbyqxmd.com/read/28334656/lipid-profiling-in-sewage-sludge
#4
Fenfen Zhu, Xuemin Wu, Luyao Zhao, Xiaohui Liu, Juanjuan Qi, Xueying Wang, Jiawei Wang
High value-added reutilization of sewage sludge from wastewater treatment plants (WWTPs) is essential in sustainable development in WWTPs. However, despite the advantage of high value reutilization, this process must be based on a detailed study of organics in sludge. We used the methods employed in life sciences to determine the profile of lipids (cellular lipids, free fatty acids (FFAs), and wax/gum) in five sludge samples obtained from three typical WWTPs in Beijing; these samples include one sludge sample from a primary sedimentation tank, two activated sludge samples from two Anaerobic-Anoxic-Oxic (A2/O) tanks, and two activated sludge samples from two membrane bioreactor tanks...
March 20, 2017: Water Research
https://www.readbyqxmd.com/read/28329709/potential-impacts-of-changing-supply-water-quality-on-drinking-water-distribution-a-review
#5
REVIEW
Gang Liu, Ya Zhang, Willem-Jan Knibbe, Cuijie Feng, Wentso Liu, Gertjan Medema, Walter van der Meer
Driven by the development of water purification technologies and water quality regulations, the use of better source water and/or upgraded water treatment processes to improve drinking water quality have become common practices worldwide. However, even though these elements lead to improved water quality, the water quality may be impacted during its distribution through piped networks due to the processes such as pipe material release, biofilm formation and detachment, accumulation and resuspension of loose deposits...
March 19, 2017: Water Research
https://www.readbyqxmd.com/read/28329708/transformation-of-para-arsanilic-acid-by-manganese-oxide-adsorption-oxidation-and-influencing-factors
#6
Tista Prasai Joshi, Gong Zhang, Hanyang Cheng, Ruiping Liu, Huijuan Liu, Jiuhui Qu
Aromatic organoarsenic compounds tend to transform into more mobile toxic inorganic arsenic via several processes, and can inadvertently spread toxic inorganic arsenic through the environment to water sources. To gain insight into the transformation mechanisms, we herein investigated how the process of para arsanilic acid (p-ASA) transformation works in detail on the surface of adsorbents by comparing it with phenylarsonic acid (PA) and aniline, which have similar chemical structures. In contrast to the values of 0...
March 18, 2017: Water Research
https://www.readbyqxmd.com/read/28340420/extended-anaerobic-conditions-in-the-biological-wastewater-treatment-higher-reduction-of-toxicity-compared-to-target-organic-micropollutants
#7
Johannes Völker, Tobias Vogt, Sandro Castronovo, Arne Wick, Thomas A Ternes, Adriano Joss, Jörg Oehlmann, Martin Wagner
Extended anaerobic conditions during biological wastewater treatment may enhance the biodegradation of micropollutants. To explore this, we combined iron-reducing or substrate-limited anaerobic conditions and aerobic pilot-scale reactors directly at a wastewater treatment plant. To investigate the detoxification by these processes, we applied two in vitro bioassays for baseline toxicity (Microtox) and reactive toxicity (AREc32) as well as in vivo bioassays with aquatic model species in two laboratory experiments (Desmodesmus subspicatus, Daphnia magna) and two on-site, flow-through experiments (Potamopyrgus antipodarum, Lumbriculus variegatus)...
March 14, 2017: Water Research
https://www.readbyqxmd.com/read/28340419/photolytic-degradation-of-the-%C3%AE-blocker-nebivolol-in-aqueous-solution
#8
Alaa Salma, Holger V Lutze, Torsten C Schmidt, Jochen Tuerk
Nebivolol (NEB) is one of the top-sold prescription drugs belonging to the third generation of beta-blockers. However, so far, occurrence data in the environment are lacking. Within this study NEB has been found for the first time in effluent samples of wastewater treatment plants in Germany with an average concentration of 13 ng L(-1). Its photodegradation behavior in the environment and in technical processes is largely unknown. To fill this gap, three different UV treatment procedures (UV-C at 254 nm, UV-B at 312 nm and UV-A at 365 nm) were investigated in three different matrices: pure water, pure water in presence of the hydroxyl radical (OH) scavenger tert...
March 13, 2017: Water Research
https://www.readbyqxmd.com/read/28324708/removal-of-haloacetic-acids-from-swimming-pool-water-by-reverse-osmosis-and-nanofiltration
#9
Linyan Yang, Qianhong She, Man Pun Wan, Rong Wang, Victor W-C Chang, Chuyang Y Tang
Recent studies report high concentrations of haloacetic acids (HAAs), a prevalent class of toxic disinfection by-products, in swimming pool water (SPW). We investigated the removal of 9 HAAs by four commercial reverse osmosis (RO) and nanofiltration (NF) membranes. Under typical SPW conditions (pH 7.5 and 50 mM ionic strength), HAA rejections were >60% for NF270 with molecular weight cut-off (MWCO) equal to 266 Da and equal or higher than 90% for XLE, NF90 and SB50 with MWCOs of 96, 118 and 152 Da, respectively, as a result of the combined effects of size exclusion and charge repulsion...
March 10, 2017: Water Research
https://www.readbyqxmd.com/read/28292678/evaluation-of-thermal-hydrolysis-efficiency-of-mechanically-dewatered-sewage-sludge-via-rheological-measurement
#10
Jingsi Zhang, Yonggang Xue, Nicky Eshtiaghi, Xiaohu Dai, Wenquan Tao, Zhuo Li
In this study, laboratory tests of both low temperature (60-90 °C) and high temperature (120-180 °C) thermal hydrolysis (LTHP and HTHP) were performed on mechanically dewatered high-solid sludges (at total solid of 14.2 wt% and 18.2 wt%) to evaluate the extent of organic solubilization through rheological measurements. The effects of treatment temperature and duration on organic solubilization and viscoelastic behavior of the sludge were comprehensively investigated. The results indicated that the organic solubilization contents including soluble chemical oxygen demand, soluble protein, and soluble polysaccharides increased logarithmically with the treatment time...
March 10, 2017: Water Research
https://www.readbyqxmd.com/read/28292677/multiple-lines-of-evidence-to-identify-sewage-as-the-cause-of-water-quality-impairment-in-an-urbanized-tropical-watershed
#11
Marek Kirs, Veljo Kisand, Mayee Wong, Roberto A Caffaro-Filho, Philip Moravcik, Valerie J Harwood, Bunnie Yoneyama, Roger S Fujioka
Indicator bacteria, which are conventionally used to evaluate recreational water quality, can originate from various non-human enteric and extra-enteric sources, hence they may not be indicative of human health risk nor do they provide information on the sources of contamination. In this study we utilized traditional (enterococci and Escherichia coli) and alternative (Clostridium perfringens) indicator bacteria, F(+)-specific coliphage, molecular markers for microorganisms associated with human sewage (human-associated Bacteroides and polyomaviruses), and microbial community analysis tools (16S rRNA gene fragment amplicon sequencing), to identify and evaluate human sewage-related impact in the Manoa watershed in Honolulu, Hawaii...
March 10, 2017: Water Research
https://www.readbyqxmd.com/read/28324710/dual-substrate-limitation-modeling-and-implications-for-mainstream-deammonification
#12
Heather A Stewart, Ahmed Al-Omari, Charles Bott, Haydee De Clippeleir, Chunyang Su, Imre Takacs, Bernhard Wett, Arash Massoudieh, Sudhir Murthy
Substrate limitation occurs frequently in wastewater treatment and knowledge about microbial behavior at limiting conditions is essential for the use of biokinetic models in system design and optimization. Monod kinetics are well-accepted for modeling growth rates when a single substrate is limiting, but several models exist for treating two or more limiting substrates simultaneously. In this study three dual limitation models (multiplicative, minimum, and Bertolazzi) were compared based on experiments using nitrite-oxidizing bacteria (limited by dissolved oxygen and nitrite) and ANaerobic AMMonia-OXidizing bacteria or Aanammox (limited by ammonium and nitrite) within mixed liquor from deammonification pilots...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28324709/improvement-of-virus-removal-using-ultrafiltration-membranes-modified-with-grafted-zwitterionic-polymer-hydrogels
#13
Ruiqing Lu, Chang Zhang, Maria Piatkovsky, Mathias Ulbricht, Moshe Herzberg, Thanh H Nguyen
Potable water reuse has been adopted by cities suffering water scarcity in recent years. The microbial safety in water reuse, especially with respect to pathogenic viruses, is still a concern for water consumers. Membrane filtration can achieve sufficient removal of pathogenic viruses without disinfection byproducts, but the required energy is intensive. In this study, we graft-polymerized zwitterionic SPP ([3-(methacryloylamino) propyl] dimethyl (3-sulfopropyl) ammonium hydroxide) on a 150 kDa ultrafiltration polyethersulfone membrane to achieve a significantly higher virus removal...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28292676/permeability-of-uncharged-organic-molecules-in-reverse-osmosis-desalination-membranes
#14
Emil Dražević, Krešimir Košutić, Marin Svalina, Jacopo Catalano
Reverse osmosis (RO) membranes are primarily designed for removal of salts i.e. for desalination of brackish and seawater, but they have also found applications in removal of organic molecules. While it is clear that steric exclusion is the dominant removal mechanism, the fundamental explanation for how and why the separation occurs remains elusive. Until recently there was no strong microscopic evidences elucidating the structure of the active polyamide layers of RO membranes, and thus they have been conceived as "black boxes"; or as an array of straight capillaries with a distribution of radii; or as polymers with a small amount of polymer free domains...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28314209/pharmaceuticals-removal-and-microbial-community-assessment-in-a-continuous-fungal-treatment-of-non-sterile-real-hospital-wastewater-after-a-coagulation-flocculation-pretreatment
#15
J A Mir-Tutusaus, E Parladé, M Llorca, M Villagrasa, D Barceló, S Rodriguez-Mozaz, M Martinez-Alonso, N Gaju, G Caminal, M Sarrà
Hospital wastewaters are a main source of pharmaceutical active compounds, which are usually highly recalcitrant and can accumulate in surface and groundwater bodies. Fungal treatments can remove these contaminants prior to discharge, but real wastewater poses a problem to fungal survival due to bacterial competition. This study successfully treated real non-spiked, non-sterile wastewater in a continuous fungal fluidized bed bioreactor coupled to a coagulation-flocculation pretreatment for 56 days. A control bioreactor without the fungus was also operated and the results were compared...
March 8, 2017: Water Research
https://www.readbyqxmd.com/read/28314208/long-term-effects-of-sulphide-on-the-enhanced-biological-removal-of-phosphorus-the-symbiotic-role-of-thiothrix-caldifontis
#16
F J Rubio-Rincón, L Welles, C M Lopez-Vazquez, M Nierychlo, B Abbas, M Geleijnse, P H Nielsen, M C M van Loosdrecht, D Brdjanovic
Thiothrix caldifontis was the dominant microorganism (with an estimated bio-volume of 65 ± 3%) in a lab-scale enhanced biological phosphorus removal (EBPR) system containing 100 mg of sulphide per litre in the influent. After a gradual exposure to the presence of sulphide, the EBPR system initially dominated by Candidatus Accumulibacter phosphatis Clade I (98 ± 3% bio-volume) (a known polyphosphate accumulating organism, PAO) became enriched with T. caldifontis. Throughout the different operating conditions studied, practically 100% phosphate removal was always achieved...
March 7, 2017: Water Research
https://www.readbyqxmd.com/read/28292679/evaluation-of-cytotoxicity-genotoxicity-and-apoptosis-of-wastewater-before-and-after-disinfection-with-performic-acid
#17
Patrizia Ragazzo, Donatella Feretti, Silvano Monarca, Luca Dominici, Elisabetta Ceretti, Gaia Viola, Valentina Piccolo, Nicoletta Chiucchini, Milena Villarini
Disinfection with performic acid (PFA) represents an emerging technology in wastewater treatment. Many recent studies indicate its effectiveness and suitability as a disinfectant for different applications; several have demonstrated its reliability as an alternative to chlorine for disinfecting secondary effluents from urban wastewater treatment plants (WWTPs). Some disinfection technologies, in relation to their oxidative power, lead to the formation of disinfection by-products (DBPs), some of which are of concern for their toxic and carcinogenic potential...
March 7, 2017: Water Research
https://www.readbyqxmd.com/read/28340415/uncertainty-analysis-for-effluent-trading-planning-using-a-bayesian-estimation-based-simulation-optimization-modeling-approach
#18
J L Zhang, Y P Li, G H Huang, B W Baetz, J Liu
In this study, a Bayesian estimation-based simulation-optimization modeling approach (BESMA) is developed for identifying effluent trading strategies. BESMA incorporates nutrient fate modeling with soil and water assessment tool (SWAT), Bayesian estimation, and probabilistic-possibilistic interval programming with fuzzy random coefficients (PPI-FRC) within a general framework. Based on the water quality protocols provided by SWAT, posterior distributions of parameters can be analyzed through Bayesian estimation; stochastic characteristic of nutrient loading can be investigated which provides the inputs for the decision making...
March 6, 2017: Water Research
https://www.readbyqxmd.com/read/28324707/chemical-structure-based-predictive-model-for-the-oxidation-of-trace-organic-contaminants-by-sulfate-radical
#19
Tiantian Ye, Zongsu Wei, Richard Spinney, Chong-Jian Tang, Shuang Luo, Ruiyang Xiao, Dionysios D Dionysiou
Second-order rate constants [Formula: see text] for the reaction of sulfate radical anion (SO4(•-)) with trace organic contaminants (TrOCs) are of scientific and practical importance for assessing their environmental fate and removal efficiency in water treatment systems. Here, we developed a chemical structure-based model for predicting [Formula: see text] using 32 molecular fragment descriptors, as this type of model provides a quick estimate at low computational cost. The model was constructed using the multiple linear regression (MLR) and artificial neural network (ANN) methods...
March 6, 2017: Water Research
https://www.readbyqxmd.com/read/28292675/removal-of-several-pesticides-in-a-falling-water-film-dbd-reactor-with-activated-carbon-textile-energy-efficiency
#20
Patrick Vanraes, Houria Ghodbane, Dries Davister, Niels Wardenier, Anton Nikiforov, Yannick P Verheust, Stijn W H Van Hulle, Oualid Hamdaoui, Jeroen Vandamme, Jim Van Durme, Pieter Surmont, Frederic Lynen, Christophe Leys
Bio-recalcitrant micropollutants are often insufficiently removed by modern wastewater treatment plants to meet the future demands worldwide. Therefore, several advanced oxidation techniques, including cold plasma technology, are being investigated as effective complementary water treatment methods. In order to permit industrial implementation, energy demand of these techniques needs to be minimized. To this end, we have developed an electrical discharge reactor where water treatment by dielectric barrier discharge (DBD) is combined with adsorption on activated carbon textile and additional ozonation...
March 6, 2017: Water Research
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