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Water Research

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https://www.readbyqxmd.com/read/28436827/reductive-precipitation-of-sulfate-and-soluble-fe-iii-by-desulfovibrio-vulgaris-electron-donor-regulates-intracellular-electron-flow-and-nano-fes-crystallization
#1
Chen Zhou, Yun Zhou, Bruce E Rittmann
Fully understanding the metabolism of SRB provides fundamental guidelines for allowing the microorganisms to provide more beneficial services in water treatment and resource recovery. The electron-transfer pathway of sulfate respiration by Desulfovibrio vulgaris is well studied, but still partly unresolved. Here we provide deeper insight by comprehensively monitoring metabolite changes during D. vulgaris metabolism with two electron donors, lactate and pyruvate, in presence or absence of citrate-chelated soluble Fe(III) as an additional competing electron acceptor...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28436826/degradation-of-nitro-based-pharmaceuticals-by-uv-photolysis-kinetics-and-simultaneous-reduction-on-halonitromethanes-formation-potential
#2
Huiyu Dong, Zhimin Qiang, Junfeng Lian, Jiuhui Qu
This study investigated the degradation kinetics and halonitromethanes formation potential (HNMsFP) of two nitro-based pharmaceuticals (i.e., ranitidine (RNTD) and nizatidine (NZTD)) during ultraviolet (UV) photolysis. It was found that the degradation kinetics of RNTD and NZTD exhibited pH-dependent trends, in accordance with their deprotonation equilibria. The neutral species of RNTD and NZTD were more photo-reactive than their corresponding deprotonated species, with their specific fluence-based first-order rate constants varying in the range of 5...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28436824/efficient-treatment-of-aniline-containing-wastewater-in-bipolar-membrane-microbial-electrolysis-cell-fenton-system
#3
Xiaohu Li, Xiangdan Jin, Nannan Zhao, Irini Angelidaki, Yifeng Zhang
Aniline-containing wastewater can cause significant environmental problems and threaten the humans's life. However, rapid degradation of aniline with cost-efficient methods remains a challenge. In this work, a novel microbial electrolysis cell with bipolar membrane was integrated with Fenton reaction (MEC-Fenton) for efficient treatment of real wastewater containing a high concentration (4460 ± 52 mg L(-1)) of aniline. In this system, H2O2 was in situ electro-synthesized from O2 reduction on the graphite cathode and was simultaneously used as source of OH for the oxidation of aniline wastewater under an acidic condition maintained by the bipolar membrane...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28432932/surveillance-of-vittaforma-corneae-in-hot-springs-by-a-small-volume-procedure
#4
Jung-Sheng Chen, Tsui-Kang Hsu, Bing-Mu Hsu, Tung-Yi Huang, Yu-Li Huang, Men-Fang Shaio, Dar-Der Ji
Vittaforma corneae is an obligate intracellular fungus and can cause human ocular microsporidiosis. Although accumulating reports of V. corneae causing keratoconjunctivitis in both healthy and immunocompromised persons have been published, little is known about the organism's occurrence in aquatic environments. Limitations in detection sensitivity have meant a large sampling volume is required to detect the pathogen up to now, which is problematic. A recent study in Taiwan has shown that some individuals suffering from microsporidial keratitis (MK) were infected after exposure to the pathogen at a hot spring...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28436823/flocculation-and-antimicrobial-properties-of-a-cationized-starch
#5
Zhouzhou Liu, Mu Huang, Aimin Li, Hu Yang
In this study, a series of cationized starch-based flocculants (starch-3-chloro-2-hydroxypropyl triethyl ammonium chloride, St-CTA) containing various quaternary ammonium salt groups on the starch backbone were prepared using a simple etherification reaction. All of the prepared starch-based flocculants show effective performance for the flocculation of kaolin suspension, two bacterial (Escherichia coli and Staphylococcus aureus) suspensions, and two contaminant mixtures (kaolin and each bacterium) under most pH conditions...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28433878/effect-of-freshwater-sediment-characteristics-on-the-persistence-of-fecal-indicator-bacteria-and-genetic-markers-within-a-southern-california-watershed
#6
Amity G Zimmer-Faust, Vanessa Thulsiraj, Catalina Marambio-Jones, Yiping Cao, John F Griffith, Patricia A Holden, Jennifer A Jay
In this study, the aging of culturable FIB and DNA representing genetic markers for Enterococcus spp. (ENT1A), general Bacteroides (GB3), and human-associated Bacteroides (HF183) in freshwater sediments was evaluated. Freshwater sediment was collected from four different sites within the upper and lower reach of the Topanga Creek Watershed and two additional comparator sites within the Santa Monica Bay, for a total of six sites. Untreated (ambient) and oven-dried (reduced microbiota) sediment was inoculated with 5% sewage and artificial freshwater...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28433695/disinfection-of-water-inoculated-with-enterococcus-faecalis-using-solar-fe-iii-edds-h2o2-or-s2o8-2-process
#7
A Bianco, M I Polo López, P Fernández Ibáñez, M Brigante, G Mailhot
In this study, the activation of H2O2 and persulfate ions induced by solar photolysis of Fe(III)EDDS complex were investigated in water disinfection, applying solar AOPs processes. The use of Fe(III)EDDS complex maintains iron in soluble form until slightly basic pH and so the photolysis is efficient in a large range of pH compatible with natural waters. Moreover, for the first time, the impact of photogenerated hydroxyl and sulfate radicals on the inactivation of Enterococcus faecalis in water was studied...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28431349/impacts-of-environmental-factors-on-arsenate-biotransformation-and-release-in-microcystis-aeruginosa-using-the-taguchi-experimental-design-approach
#8
Zhenhong Wang, Zhuanxi Luo, Changzhou Yan, Baoshan Xing
Very limited information is available on how and to what extent environmental factors influence arsenic (As) biotransformation and release in freshwater algae. These factors include concentrations of arsenate (As(V)), dissolved inorganic nitrogen (N), phosphate (P), and ambient pH. This study conducted a series of experiments using Taguchi methods to determine optimum conditions for As biotransformation. We assessed principal effective factors of As(V), N, P, and pH and determined that As biotransformation and release actuate at 10...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28431348/evaluation-of-structural-effects-on-the-flocculation-performance-of-a-co-graft-starch-based-flocculant
#9
Zhouzhou Liu, Hua Wei, Aimin Li, Hu Yang
The molecular structure of a material substantially determines its final application performance. In this work, a series of starch-based flocculants with different charge densities and average graft chain lengths were prepared by the co-graft polymerization of acrylamide and [(2-methacryloyloxyethyl) trimethyl ammonium chloride] (St-g-PAM-co-PDMC). The flocculation performance of St-g-PAM-co-PDMC was studied systematically at neutral pH using kaolin suspension and sodium humate (NaHA) aqueous solution as synthetic wastewaters...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28436825/integrated-ecological-and-chemical-food-web-accumulation-modeling-explains-pah-temporal-trends-during-regime-shifts-in-a-shallow-lake
#10
Xiangzhen Kong, Wei He, Ning Qin, Wenxiu Liu, Bin Yang, Chen Yang, Fuliu Xu, Wolf M Mooij, Albert A Koelmans
Shallow lakes can switch suddenly from a turbid situation with high concentrations of phytoplankton and other suspended solids to a vegetated state with clear water, and vice versa. These alternative stable states may have a substantial impact on the fate of hydrophobic organic compounds (HOCs). Models that are fit to simulate impacts from these complex interactions are scarce. We developed a contaminant fate model which is linked to an ecosystem model (PCLake) for shallow lakes. This integrated model was successful in simulating long-term dynamics (1953-2012) of representative polycyclic aromatic hydrocarbons (PAHs) in the main biotic and abiotic components in a large shallow lake (Chaohu in China), which has undergone regime shifts in this period...
April 17, 2017: Water Research
https://www.readbyqxmd.com/read/28433881/fouling-behavior-of-lysozyme-on-different-membrane-surfaces-during-the-md-operation-an-especial-interest-in-the-interaction-energy-evaluation
#11
Chang Liu, Lin Chen, Liang Zhu
The membrane fouling behaviors of lysozyme (LYS) on three different membranes were systematically investigated during the membrane distillation (MD) process, including polypropylene (PP), polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) membranes. The results showed that PP membrane was not suitable for the MD operation due to its lower heat resistance. A flux decline of 50% was observed for the PTFE, while PVDF displayed a more severe decrement of 70%. Additionally, the PTFE and PVDF membranes both demonstrated a faster flux decline during the early period, and then a clear decrement of fouling rate was obtained at the later period...
April 17, 2017: Water Research
https://www.readbyqxmd.com/read/28433879/sulfamethoxazole-degradation-in-anaerobic-sulfate-reducing-bacteria-sludge-system
#12
Yanyan Jia, Samir Kumar Khanal, Huiqun Zhang, Guang-Hao Chen, Hui Lu
Sulfamethoxazole (SMX) is one of the most commonly used antibiotics. SMX degradation in sulfate-reducing bacteria (SRB) sludge systems has not been reported so far. This research investigated the SMX degradation using SRB sludge in a sulfate-reducing up-flow sludge bed reactor. Moreover, the mechanisms and kinetics of SMX removal were also investigated using SRB sludge via a series of batch experiments. The results showed that SMX removal was characterized by a rapid sorption onto SRB sludge, and desorption from SRB sludge to aqueous phase until achieving equilibrium, and then followed by slow biodegradation...
April 17, 2017: Water Research
https://www.readbyqxmd.com/read/28431346/caged-gammarus-as-biomonitors-identifying-thresholds-of-toxic-metal-bioavailability-that-affect-gammarid-densities-at-the-french-national-scale
#13
Alexandre Ciliberti, Arnaud Chaumot, Rémi Recoura-Massaquant, André Chandesris, Adeline François, Marina Coquery, Martial Ferréol, Olivier Geffard
Bioaccumulated concentrations of toxic elements in biomonitor invertebrate species have already been used to successfully link metal bioavailability and impairments of stream macroinvertebrate communities at the scale of the watershed. However, implementing this empirical comparative approach at a greater spatial scale remains a challenge due to the diversity of biogeographical contexts encompassed by regional and national scales. We showed in previous studies that the use of standard organisms caged permits the use of a common biomonitor over a far greater geographical range, while limiting the influence of confounding factors on levels of bioavailable contamination...
April 17, 2017: Water Research
https://www.readbyqxmd.com/read/28436821/hydrological-modeling-of-fecal-indicator-bacteria-in-a-tropical-mountain-catchment
#14
Minjeong Kim, Laurie Boithias, Kyung Hwa Cho, Norbert Silvera, Chanthamousone Thammahacksa, Keooudone Latsachack, Emma Rochelle-Newall, Oloth Sengtaheuanghoung, Alain Pierret, Yakov A Pachepsky, Olivier Ribolzi
The occurrence of pathogen bacteria in surface waters is a threat to public health worldwide. In particular, inadequate sanitation resulting in high contamination of surface water with pathogens of fecal origin is a serious issue in developing countries such as Lao P.D.R. Despite the health implications of the consumption of contaminated surface water, the environmental fate and transport of pathogens of fecal origin and their indicators (Fecal Indicator Bacteria or FIB) are still poorly known in tropical areas...
April 15, 2017: Water Research
https://www.readbyqxmd.com/read/28431350/characteristics-and-components-of-poly-aluminum-chloride-coagulants-that-enhance-arsenate-removal-by-coagulation-detailed-analysis-of-aluminum-species
#15
Yoshihiko Matsui, Nobutaka Shirasaki, Takuro Yamaguchi, Kenta Kondo, Kaori Machida, Taiga Fukuura, Taku Matsushita
We evaluated 51 poly-aluminum chloride (PACl) coagulants to determine the coagulant characteristics that were responsible for effective arsenate removal from contaminated river water by means of experiments involving coagulation, settling, and microfiltration. Some of the high-basicity PACls exhibited high arsenate removal percentages, particularly under alkaline conditions, and we investigated various relevant properties and characteristics of these high-basicity PACls. Effective arsenate removal was correlated with the content of polymeric and colloidal aluminum species (Alb and Alc) in the PACls but was not well correlated with colloid charge or zeta potential...
April 15, 2017: Water Research
https://www.readbyqxmd.com/read/28419895/electrochemical-oxidation-of-iron-and-alkalinity-generation-for-efficient-sulfide-control-in-sewers
#16
Hui-Wen Lin, Caroline Kustermans, Eleni Vaiopoulou, Antonin Prévoteau, Korneel Rabaey, Zhiguo Yuan, Ilje Pikaar
The addition of iron salts is one of the most commonly used dosing strategies for sulfide control in sewers. However, iron salts decrease the sewage pH which not only reduces the effectiveness of sulfide precipitation but also enhances the release of residual sulfide to the sewer atmosphere. Equally important, concentrated iron salt solutions are corrosive and their frequent transport, handling, and on-site storage often come with Occupational Health and Safety (OH&S) concerns. Here, we experimentally demonstrated a novel sulfide control approach using electrochemical systems with parallel placed iron electrodes...
April 15, 2017: Water Research
https://www.readbyqxmd.com/read/28431347/improving-water-quality-in-china-environmental-investment-pays-dividends
#17
Yongqiang Zhou, Jianrong Ma, Yunlin Zhang, Boqiang Qin, Erik Jeppesen, Kun Shi, Justin D Brookes, Robert G M Spencer, Guangwei Zhu, Guang Gao
This study highlights how Chinese economic development detrimentally impacted water quality in recent decades and how this has been improved by enormous investment in environmental remediation funded by the Chinese government. To our knowledge, this study is the first to describe the variability of surface water quality in inland waters in China, the affecting drivers behind the changes, and how the government-financed conservation actions have impacted water quality. Water quality was found to be poorest in the North and the Northeast China Plain where there is greater coverage of developed land (cities + cropland), a higher gross domestic product (GDP), and higher population density...
April 14, 2017: Water Research
https://www.readbyqxmd.com/read/28438312/comment-on-combination-of-cupric-ion-with-hydroxylamine-and-hydrogen-peroxide-for-the-control-of-bacterial-biofilms-on-ro-membranes-by-hye-jin-lee-hyung-eun-kim-changha-lee-water-research-110-2017-83-90
#18
Long Chen, Ying Peng, Min Tang, Feng Wu
The methodology employed by Lee et al. to terminate their bactericidal assays was found to be flawed via our demonstrations. Briefly, EDTA or sulfite combining with cupric ion did not fully terminate, and instead even boosted the P. aeruginosa death. We therefore suggested them to seek for other means of reaction termination, such as the combination of buffering agent PBS and Cu(II)-complexing agent EDTA.
April 11, 2017: Water Research
https://www.readbyqxmd.com/read/28433880/predicting-trace-organic-compound-attenuation-by-ozone-oxidation-development-of-indicator-and-surrogate-models
#19
Minkyu Park, Tarun Anumol, Kevin D Daniels, Shimin Wu, Austin D Ziska, Shane A Snyder
Ozone oxidation has been demonstrated to be an effective treatment process for the attenuation of trace organic compounds (TOrCs); however, predicting TOrC attenuation by ozone processes is challenging in wastewaters. Since ozone is rapidly consumed, determining the exposure times of ozone and hydroxyl radical proves to be difficult. As direct potable reuse schemes continue to gain traction, there is an increasing need for the development of real-time monitoring strategies for TOrC abatement in ozone oxidation processes...
April 10, 2017: Water Research
https://www.readbyqxmd.com/read/28433694/bacteroidales-markers-for-microbial-source-tracking-in-southeast-asia
#20
Jean Pierre Nshimyimana, Mercedes C Cruz, R Janelle Thompson, Stefan Wuertz
The island city country of Singapore served as a model to validate the use of host-associated Bacteroidales 16S rRNA gene marker assays for identifying sources of fecal pollution in the urban tropical environment of Southeast Asia. A total of 295 samples were collected from sewage, humans, domesticated animals (cats, dogs, rabbits and chicken), and wild animals (birds, monkeys and wild boars). Samples were analyzed by real time PCR using five human-associated assays (HF183-SYBR Green, HF183, BacHum, BacH and B...
April 10, 2017: Water Research
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