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Water Research

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https://www.readbyqxmd.com/read/30114556/effect-of-sulfate-radical-based-oxidation-pretreatments-for-mitigating-ceramic-uf-membrane-fouling-caused-by-algal-extracellular-organic-matter
#1
Xiaoxiang Cheng, Daoji Wu, Heng Liang, Xuewu Zhu, Xiaobin Tang, Zhendong Gan, Jiajian Xing, Xinsheng Luo, Guibai Li
Algal extracellular organic matter (EOM) released from Microcystis aeruginosa can cause severe membrane fouling during algae-laden water treatment. To solve this problem, three typical sulfate radical-based advanced oxidation processes (SR-AOPs), i.e., ferrous iron/peroxymonosulfate (Fe(II)/PMS), UV/PMS and UV/Fe(II)/PMS, were employed as membrane pretreatment strategies. Their performance on mitigating EOM fouling of a ceramic UF membrane was systematically investigated and compared in the present study. The results indicated that SR-AOPs pretreatments could promote the reduction of DOC and UV254 , and the removal performance showed an apparent regularity of UV/Fe(II)/PMS > Fe(II)/PMS > UV/PMS...
August 8, 2018: Water Research
https://www.readbyqxmd.com/read/30103048/occurrence-and-fate-of-endotoxin-activity-at-drinking-water-purification-plants-and-healthcare-facilities-in-japan
#2
Dai Simazaki, Masaaki Hirose, Hisashi Hashimoto, Shunji Yamanaka, Mitsuki Takamura, Junya Watanabe, Michihiro Akiba
Occurrence of residual endotoxin activity (ET) in dialysis water and also tap water as its source is a matter of great concern to medical professionals conducting dialysis therapy at healthcare facilities (HCFs). The present study was performed to determine the occurrence and fate of the ET at selected Japanese drinking water purification plants and HCFs between 2014 and 2016. Chemical coagulation and sedimentation, rapid sand filtration, and membrane filtration were highly effective to decrease both ET dissolved in water (free-ET) and ET bound to cells/particles (bound-ET)...
August 6, 2018: Water Research
https://www.readbyqxmd.com/read/30099300/limitations-on-using-cdom-as-a-proxy-for-doc-in-temperate-lakes
#3
Claire G Griffin, Jacques C Finlay, Patrick L Brezonik, Leif Olmanson, Raymond M Hozalski
Colored dissolved organic matter (CDOM) has been widely studied as part of efforts to improve understanding of the aquatic carbon cycle, by laboratory, in situ, and remote sensing methods. We studied ecoregion-scale differences in CDOM and dissolved organic carbon (DOC) to understand variability in organic matter composition and the use of CDOM as a proxy for DOC. Data from 299 lakes across the U.S. Upper Midwest showed that CDOM, measured as absorptivity at 440 nm (a440 ), correlated strongly with DOC (R2  = 0...
August 6, 2018: Water Research
https://www.readbyqxmd.com/read/30096695/electrochemical-filtration-process-for-simultaneous-removal-of-refractory-organic-and-particulate-contaminants-from-wastewater-effluents
#4
Naresh Mameda, Hyeona Park, Kwang-Ho Choo
Versatile electrochemical reactions are effective for removing a wide range of water contaminants. This study focuses on the development and testing of bifunctional electrocatalytic filter anodes as reactive and separating media for the simultaneous removal of refractory dissolved organic and particulate contaminants from real wastewater effluents. The results show that the TiO2 particle interlayers formed between the Ti fiber support and the top composite metal oxide catalyst layers assist in reducing filter pores to an effective size range that enables removal of most particulates within the wastewater...
August 4, 2018: Water Research
https://www.readbyqxmd.com/read/30096694/reactive-photo-fenton-ceramic-membranes-synthesis-characterization-and-antifouling-performance
#5
Shaobin Sun, Hong Yao, Wanyi Fu, Likun Hua, Guangshan Zhang, Wen Zhang
To develop reactive and antifouling membrane filtration systems, a photo-Fenton ceramic membrane was prepared by coating goethite (α-FeOOH) catalysts on a zirconia/titania alumina membrane via a cross-linking method. Scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to characterize α-FeOOH catalysts and the surface coating quality. The cross linker yielded stable covalent binding between catalyst and membrane under room temperature and produced a homogeneous and smooth coating of catalyst on ceramic membranes...
August 4, 2018: Water Research
https://www.readbyqxmd.com/read/30096688/bioaugmented-soil-aquifer-treatment-for-p-nitrophenol-removal-in-wastewater-unique-for-cold-regions
#6
Xi Zhang, Y S Yang, Ying Lu, Y J Wen, P P Li, Ge Zhang
P-nitrophenol (PNP) is a toxic and recalcitrant organic pollutant and a usual intermediate in the production of fine chemicals, which has posed a significant threat to subsurface environment safety. Soil aquifer treatment (SAT) is a promising method to remove and remediate contamination in vadose zone with low cost and high efficiency. However, there are still research gaps for the treatment of recalcitrant contaminants by SAT in cold regions, such as un-robust indigenous microbes and low temperature constraint in vadose zone...
August 4, 2018: Water Research
https://www.readbyqxmd.com/read/30099301/system-level-model-and-experiments-for-irrigation-water-alkalinity-reduction-and-enrichment-using-an-atmospheric-pressure-dielectric-barrier-discharge
#7
Jose Alejandro Buendia, Edgar Perez-Lopez, Ayyaswamy Venkattraman
The treatment of distilled water with varying amounts of dissolved sodium bicarbonate (representing alkalinity) is considered using an atmospheric pressure electrical discharge. The discharge ignited between a capillary tube (used as powered electrode) and a ground electrode wrapped around the beaker holding the treated water consists of streamers propagating in ambient air and striking the water surface. The streamer interaction with water is shown to lead to a decrease in pH and an increase in nitrate concentration...
August 2, 2018: Water Research
https://www.readbyqxmd.com/read/30096690/development-of-a-mobile-groundwater-desalination-system-for-communities-in-rural-india
#8
Qiyuan Li, Boyue Lian, Yuan Wang, Robert A Taylor, Michelle Dong, Tracey Lloyd, Xuefei Liu, Joel Tan, Md Mahfuz Ashraf, Divyang Waghela, Gregory Leslie
The consumption of saline groundwater has contributed to a growing incidence of renal diseases, particularly in coastal communities of India. Although reverse osmosis (RO) is routinely used to remove salt from groundwater, conventional RO systems (i.e. centralized systems using spiral wound RO elements) have limited utility in these communities due to high capital and maintenances costs, and lack of infrastructure to distribute the water. Consequently, there is a need to develop an appropriate solution for groundwater treatment based on small-scale, mobile and community-led systems...
August 2, 2018: Water Research
https://www.readbyqxmd.com/read/30096689/water-quality-impacts-in-semi-arid-regions-can-natural-green-filters-mitigate-adverse-effects-on-fish-assemblages
#9
Alberto Maceda-Veiga, Ralph Mac Nally, Adolfo de Sostoa
The effective aridity in riparian areas is increasing from climate change and from human water consumption, which exacerbates the impacts of effluents from wastewater-treatment plants and from catchment run-off in rivers. The potential of natural riparian areas to act as 'green filters' has long been recognized, but the possible ecological benefits of natural riparian areas over large-scale environmental gradients on fish have not been explored in detail. Using an extensive data-set from northeastern Spain (99,700 km2 , 15 catchments, 530 sites), ours is the first study to ask whether natural riparian vegetation can mitigate the effects of pollution on fish in rivers experiencing water scarcity...
August 2, 2018: Water Research
https://www.readbyqxmd.com/read/30114555/impacts-of-low-temperature-thermal-treatment-on-microbial-detoxification-of-tetrachloroethene-under-continuous-flow-conditions
#10
Tyler F Marcet, Natalie L Cápiro, Yi Yang, Frank E Löffler, Kurt D Pennell
Coupling in situ thermal treatment (ISTT) with microbial reductive dechlorination (MRD) has the potential to enhance contaminant degradation and reduce cleanup costs compared to conventional standalone remediation technologies. Impacts of low-temperature ISTT on Dehalococcoides mccartyi (Dhc), a relevant species in the anaerobic degradation of cis-1,2-dichloroethene (cis-DCE) and vinyl chloride (VC) to nontoxic ethene, were assessed in sand-packed columns under dynamic flow conditions. Dissolved tetrachloroethene (PCE; 258 ± 46 μM) was introduced to identical columns bioaugmented with the PCE-to-ethene dechlorinating consortium KB-1® ...
July 31, 2018: Water Research
https://www.readbyqxmd.com/read/30096687/significant-chemical-fluxes-from-natural-terrestrial-groundwater-rival-anthropogenic-and-fluvial-input-in-a-large-river-deltaic-estuary
#11
Xin Luo, Jiu Jimmy Jiao, Willard S Moore, John A Cherry, Ya Wang, Kun Liu
The shores of the Pearl River estuary are home to 35 million people. Their wastes are discharged into the large river delta-front estuary (LDE), one of the most highly polluted systems in the world. Here we construct a radium reactive transport model to estimate the terrestrial groundwater discharge (TGD) into the highly urbanized Pearl River LDE. We find the TGD comprises only approximately 0.9% in term of water discharge compared to the river discharge. The TGD in the Pearl River LDE delivers significant chemical fluxes to the coast, which are comparable to the fluvial loadings from Pearl River and other world major rivers...
July 31, 2018: Water Research
https://www.readbyqxmd.com/read/30086530/abatement-of-2-4-d-by-h-2-o-2-solar-photolysis-and-solar-photo-fenton-like-process-with-minute-fe-iii-concentrations
#12
Anna Serra-Clusellas, Laura De Angelis, Chung-Ho Lin, Phuc Vo, Mohamed Bayati, Lloyd Sumner, Zhentian Lei, Nathalia B Amaral, Liliana M Bertini, Jose Mazza, Luis R Pizzio, Jorge D Stripeikis, Julián A Rengifo-Herrera, María M Fidalgo de Cortalezzi
The Photo-Fenton-like (PF-like) process with minute Fe(III) concentrations and the Hydrogen Peroxide Photolysis (HPP), using Xe-lamp or solar light as sources of irradiation, were efficiently applied to eliminate the herbicide 2,4-D from water. PF-like experiments concerning ferric and H2 O2 concentrations of 0.6 mg L-1 and 20 mg L-1 respectively, using Xenon lamps (Xe-lamps) as a source of irradiation and 2,4-D concentrations of 10 mg L-1 at pH 3.6, exhibited complete 2,4-D degradation and 77% dissolved organic carbon (DOC) removal after 30 min and 6 h of irradiation respectively whereas HPP (in absence of ferric ions) experiments showed a 2,4-D reduction and DOC removal of 90% and 7% respectively after 6 h of irradiation...
July 31, 2018: Water Research
https://www.readbyqxmd.com/read/30077913/dynamic-molecular-size-transformation-of-aquatic-colloidal-organic-matter-as-a-function-of-ph-and-cations
#13
Huacheng Xu, Hui Lin, Helong Jiang, Laodong Guo
Knowledge of the dynamic changes in molecular size of natural colloidal organic matter (COM) along the aquatic continuum is of vital importance for a better understanding of the environmental fate and ecological role of dissolved organic matter and associated contaminants in aquatic systems. We report here the pH- and cation-dependent size variations of COMs with different sources (river and lake) quantified using flow field-flow fractionation (FIFFF), fluorescence spectroscopy and parallel factor analysis (PARAFAC), attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, and zeta potential analysis...
July 31, 2018: Water Research
https://www.readbyqxmd.com/read/30081335/tuning-culturing-conditions-towards-the-production-of-neutral-lipids-from-lubricant-based-wastewater-in-open-mixed-bacterial-communities
#14
Ana Rita Castro, Pedro T S Silva, Paulo J G Castro, Eliana Alves, M Rosário M Domingues, Maria Alcina Pereira
Production of bacterial lipid-based biofuels using inexpensive substrates, as wastes, is an emerging approach. In this work, a selective process using carbon feast-famine cycles was applied to obtain an indigenous microbial community of hydrocarbon-degrading and lipid-accumulating bacteria, using a real lubricant-based wastewater as carbon source. In the conditions applied, the enriched bacterial community, dominated by members of the genus Rhodococcus, Pseudomonas and Acinetobacter, was able to degrade almost all hydrocarbons present in the wastewater within 24 h' incubation and to accumulate, although in low levels, triacylglycerol (TAG) (<5% of cell dry weight (CDW)) and polyhydroxyalkanoates (PHA) (3...
July 30, 2018: Water Research
https://www.readbyqxmd.com/read/30077914/a-granular-activated-carbon-electrochemical-hybrid-system-for-onsite-treatment-and-reuse-of-blackwater
#15
Tate W Rogers, Tess S Rogers, Mikayla H Stoner, Katelyn L Sellgren, Brendon J Lynch, Aaron A Forbis-Stokes, Brian R Stoner, Brian T Hawkins
Over 1/3 of the global population lacks access to improved sanitation, leading to disease, death, and impaired economic development. Our group is working to develop rapidly deployable, cost-effective, and sustainable solutions to this global problem that do not require significant investments in infrastructure. Previously, we demonstrated the feasibility of a toilet system that recycles blackwater for onsite reuse as flush water, in which the blackwater is electrochemically treated to remove pathogens due to fecal contamination...
July 30, 2018: Water Research
https://www.readbyqxmd.com/read/30098528/sorption-of-organic-compounds-to-two-diesel-soot-black-carbons-in-water-evaluated-by-liquid-chromatography-and-polyparameter-linear-solvation-energy-relationship
#16
Po-Hsin Su, Dave Ta Fu Kuo, Yang-Hsin Shih, Chih-Yu Chen
Substantial variability in sorption capacity of black carbon (BC) has been a major challenge for accurate fate and risk assessment of organic pollutants in soils and sediments. 16 model organic sorbates (logKOW  = 0.38-4.21) encompassing diverse chemical functionalities were used to probe the sorption capacity of two diesel soot samples representative of graphitic BC (BC1, specific surface area (SSA) = 87 m2 /g) and amorphous, oxygenated BC (BC2; SSA = 3.6 m2 /g). The BC-water sorption coefficients (logKBC ) of the model sorbates were determined using reversed-phase liquid chromatography (RP-LC) on soot-filled columns...
July 27, 2018: Water Research
https://www.readbyqxmd.com/read/30092505/rapid-oxidation-of-iodide-and-hypoiodous-acid-with-ferrate-and-no-formation-of-iodoform-and-monoiodoacetic-acid-in-the-ferrate-i-ha-system
#17
Xianshi Wang, Yulei Liu, Zhuangsong Huang, Lu Wang, Yicheng Wang, Yanting Li, Juan Li, Jingyao Qi, Jun Ma
Toxic and odorous iodinated disinfection byproducts (I-DBPs) could form in the chemical oxidation of iodine-containing water. A critical step for controlling the hazardous I-DBPs is to convert the iodine species into stable and harmless iodate (IO3 - ) while inhibiting the accumulation of highly reactive hypoiodous acid (HOI). Herein, the oxidation of I- and HOI with ferrate was investigated, and the formation profile of HOI was determined based on 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) coloring method through a stopped-flow spectrophotometer...
July 27, 2018: Water Research
https://www.readbyqxmd.com/read/30092504/frequency-analysis-and-resonant-operation-for-efficient-capacitive-deionization
#18
Ashwin Ramachandran, Steven A Hawks, Michael Stadermann, Juan G Santiago
Capacitive deionization (CDI) performance metrics can vary widely with operating methods. Conventional CDI operating methods such as constant current and constant voltage show advantages in either energy or salt removal performance, but not both. We here develop a theory around and experimentally demonstrate a new operation for CDI that uses sinusoidal forcing voltage (or sinusoidal current). We use a dynamic system modeling approach, and quantify the frequency response (amplitude and phase) of CDI effluent concentration...
July 27, 2018: Water Research
https://www.readbyqxmd.com/read/30077910/urbanization-and-climate-change-impacts-on-surface-water-quality-enhancing-the-resilience-by-reducing-impervious-surfaces
#19
Salerno Franco, Viviano Gaetano, Tartari Gianni
Climate change and urbanization are key factors affecting the future of water quality in urbanized catchments. The work reported in this paper is an evaluation of the combined and relative impact of climate change and urbanization on the water quality of receiving water bodies in the context of a highly urbanized watershed served by a combined sewer system (CSS) in northern Italy. The impact is determined by an integrated modelling study involving two years of field campaigns. The results obtained from the case study show that impervious urban surfaces and rainfall intensity are significant predictors of combined sewer overflows (CSOs) and consequently of the water quality of the receiving water body...
July 27, 2018: Water Research
https://www.readbyqxmd.com/read/30077909/the-impact-of-disinfection-ct-values-on-cytotoxicity-of-agricultural-wastewaters-ozonation-vs-chlorination
#20
Shengkun Dong, Nedal Massalha, Michael J Plewa, Thanh H Nguyen
Toxicity arising from toxic disinfection byproducts is an unintended result of disinfection during water reclamation. To ensure safe water reclamation treatment, it is important to develop a disinfection strategy with minimal formation of overall toxicity in the reclaimed water. The cumulative disinfectant concentration over time (Ct) is a useful concept for pathogen control during reuse water disinfection. We evaluated the toxicity impact of Ct values and different methods to achieve identical Ct values by ozonation or chlorination of wastewaters from four agricultural sources on mammalian cells...
July 27, 2018: Water Research
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