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Water Research

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https://www.readbyqxmd.com/read/28641089/combined-time-lapse-magnetic-resonance-imaging-and-modeling-to-investigate-colloid-deposition-and-transport-in-porous-media
#1
Alizée P Lehoux, Pamela Faure, François Lafolie, Stéphane Rodts, Denis Courtier-Murias, Philippe Coussot, Eric Michel
Colloidal particles can act as vectors of adsorbed pollutants in the subsurface, or be themselves pollutants. They can reach the aquifer and impair groundwater quality. The mechanisms of colloid transport and deposition are often studied in columns filled with saturated porous media. Time-lapse profiles of colloid concentration inside the columns have occasionally been derived from magnetic resonance imaging (MRI) data recorded in transport experiments. These profiles are valuable, in addition to particle breakthrough curves (BTCs), for testing and improving colloid transport models...
June 14, 2017: Water Research
https://www.readbyqxmd.com/read/28628875/bioindicator-value-of-flagellates-in-urban-wastewater-treatment-using-membrane-bioreactors
#2
J A Parada-Albarracín, J Pérez, M A Gómez
Two experimental submerged membrane bioreactors (MBR) at the industrial scale with different membranes (microfiltration and ultrafiltration) were used to analyse the influence of the small flagellates on the lack of significance of the sludge biotic index (SBI). Also, with these systems, flagellates were analysed as bioindicators in the activated sludge of MBRs. Both facilities were operated in parallel with a pre-denitrification system for a period of nearly two years and fed with real pretreated urban wastewater...
June 14, 2017: Water Research
https://www.readbyqxmd.com/read/28641088/application-of-zeolite-hydrous-zirconia-composite-as-a-novel-sediment-capping-material-to-immobilize-phosphorus
#3
Yi Fan, Yiwen Li, Deyi Wu, Chunjie Li, Hainan Kong
A unique sediment-capping agent consisting of a zeolite/hydrous zirconia composite (ZHZ) was developed and tested for P-immobilization in the overlying water and sediment cores from a freshwater pond. In the ZHZ, NaP1 zeolite was covered with hydrous zirconia, which existed as an amorphous phase. Experimental results in pond water indicated that ZHZ could efficiently remove soluble reactive phosphorus. The 28-day sediment incubation experiments showed that capping sediment with ZHZ resulted in a more efficient, rapid and sustained decrease in P concentration when compared with the traditional alum treatment method...
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28628877/remediation-of-groundwater-contaminated-with-arsenic-through-enhanced-natural-attenuation-batch-and-column-studies
#4
Saeedreza Hafeznezami, Amity G Zimmer-Faust, Dukwoo Jun, Megyn B Rugh, Heather L Haro, Austin Park, Jae Suh, Tina Najm, Matthew D Reynolds, James A Davis, Tarannom Parhizkar, Jennifer A Jay
Batch and column laboratory experiments were conducted on natural sediment and groundwater samples from a contaminated site in Maine, USA with the aim of lowering the dissolved arsenate [As(V)] concentrations through chemical enhancement of natural attenuation capacity. In batch factorial experiments, two levels of treatment for three parameters (pH, Ca, and Fe) were studied at different levels of phosphate to evaluate their impact on As(V) solubility. Results illustrated that lowering pH, adding Ca, and adding Fe significantly increased the sorption capacity of sediments...
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28623835/life-cycle-assessment-of-treatment-and-handling-options-for-a-highly-saline-brine-extracted-from-a-potential-co2-storage-site
#5
Hafiz H Salih, Jiaxing Li, Ruth Kaplan, Seyed A Dastgheib
Carbon dioxide (CO2) injection in deep saline aquifers is a promising option for CO2 geological sequestration. However, brine extraction may be necessary to control the anticipated increase in reservoir pressure resulting from CO2 injection. The extracted brines usually have elevated concentrations of total dissolved solids (TDS) and other contaminants and require proper handling or treatment. Different options for the handling or treatment of a high-TDS brine extracted from a potential CO2 sequestration site (Mt...
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28619232/corrigendum-to-microbial-pesticide-removal-in-rapid-sand-filters-for-drinking-water-treatment-potential-and-kinetics-water-res-48-2014-71-81
#6
Mathilde J Hedegaard, Hans-Jørgen Albrechtsen
No abstract text is available yet for this article.
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28618358/identifying-structural-characteristics-of-humic-acid-to-static-and-dynamic-fluorescence-quenching-of-phenanthrene-9-phenanthrol-and-naphthalene
#7
Lin Wang, Hao Li, Yu Yang, Di Zhang, Min Wu, Bo Pan, Baoshan Xing
Fluorescence quenching is a sensitive and fast method to quantify the interactions between a fluorescent organic contaminant and a quencher, such as dissolved organic matter (DOM). Dynamic fluorescence quenching is resulted from molecular collision, not the real binding, and thus it complicates the binding data interpretation. On the other hand, static fluorescence quenching occurs for fluorescent contaminants of ground states, which decreases the concentration of freely dissolved contaminants. However, how a particular structure in DOM contributes to the static and dynamic fluorescence quenching of a fluorescent contaminant is still unclear, which has greatly hindered the application of fluorescence quenching technique...
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28628880/forward-osmosis-for-oily-wastewater-reclamation-multi-charged-oxalic-acid-complexes-as-draw-solutes
#8
Qingchun Ge, Gary Lee Amy, Tai-Shung Chung
Forward osmosis (FO) has demonstrated its merits in hybrid FO seawater desalination. However, FO may have a potential for other applications if suitable draw solutes are available. In this study, a series of novel draw solutes based on oxalic acid (OA)-transitional metal complexes are presented. Influential factors of FO performance have been systematically investigated by varying the transitional metals, cations of the complex draw solutes as well as the experimental conditions. Compared to NaCl and other recently synthesized draw solutes, the OA complexes show superior FO performance in terms of high water fluxes up to 27...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28624734/indirect-influence-of-eutrophication-on-air-water-exchange-fluxes-sinking-fluxes-and-occurrence-of-polycyclic-aromatic-hydrocarbons
#9
Yuqiang Tao, Jing Yu, Guoliang Lei, Bin Xue, Fengju Zhang, Shuchun Yao
How eutrophication affects biogeochemical processes of hydrophobic organic contaminants (HOCs) in aquatic environments is a pending challenge. Although the direct influence of eutrophication on biogeochemical processes of HOCs in waters has been well addressed, the indirect influence of eutrophication on biogeochemical processes of HOCs remains largely unknown. Here we take the large shallow eutrophic Lake Taihu in China and polycyclic aromatic hydrocarbons (PAHs) as examples to provide novel knowledge on the indirect influence of eutrophication on air - water exchange fluxes, sinking fluxes, and occurrence of HOCs...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28624732/comparison-of-different-treatment-methods-for-protein-solubilisation-from-waste-activated-sludge
#10
Keke Xiao, Yun Chen, Xie Jiang, Wan Yi Seow, Chao He, Yao Yin, Yan Zhou
Biomaterials recovery from wasted activated sludge has become an increasing interesting research topic. The purpose of this study was to systemically evaluate different sludge disintegration methods (ultrasonic, alkaline, and thermal treatments) for protein solubilisation from waste activated sludge (WAS). Compared to control without treatment, the soluble protein concentration increased by 11, 23 and 12 times under the optimal treatment conditions (ultrasonic treatment of 1 W mL(-1), alkaline treatment of pH 12 and thermal treatment at 80 °C)...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28624729/modis-observations-of-cyanobacterial-risks-in-a-eutrophic-lake-implications-for-long-term-safety-evaluation-in-drinking-water-source
#11
Hongtao Duan, Min Tao, Steven Arthur Loiselle, Wei Zhao, Zhigang Cao, Ronghua Ma, Xiaoxian Tang
The occurrence and related risks from cyanobacterial blooms have increased world-wide over the past 40 years. Information on the abundance and distribution of cyanobacteria is fundamental to support risk assessment and management activities. In the present study, an approach based on Empirical Orthogonal Function (EOF) analysis was used to estimate the concentrations of chlorophyll a (Chla) and the cyanobacterial biomarker pigment phycocyanin (PC) using data from the MODerate resolution Imaging Spectroradiometer (MODIS) in Lake Chaohu (China's fifth largest freshwater lake)...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28628878/pretreatment-of-a-primary-and-secondary-sludge-blend-at-different-thermal-hydrolysis-temperatures-impacts-on-anaerobic-digestion-dewatering-and-filtrate-characteristics
#12
Matthew J Higgins, Steven Beightol, Ushma Mandahar, Ryu Suzuki, Steven Xiao, Hung-Wei Lu, Trung Le, Joshua Mah, Bipin Pathak, Haydee DeClippeleir, John T Novak, Ahmed Al-Omari, Sudhir N Murthy
A study was performed to evaluate the effect of thermal hydrolysis pretreatment (THP) temperature on subsequent digestion performance and operation, as well as downstream parameters such as dewatering and cake quality. A blend of primary and secondary solids from the Blue Plains treatment plant in Washington, DC was dewatered to about 16% total solids (TS), and thermally hydrolyzed at five different temperatures 130, 140, 150, 160, 170 °C. The thermally hydrolyzed solids were then fed to five separate, 10 L laboratory digesters using the same feed concentration, 10...
June 9, 2017: Water Research
https://www.readbyqxmd.com/read/28624730/efficient-degradation-of-tetrabromobisphenol-a-by-synergistic-integration-of-fe-ni-bimetallic-catalysis-and-microbial-acclimation
#13
Xingxing Peng, Zhangna Wang, Jingfei Huang, Barry R Pittendrigh, Shengwei Liu, Xiaoshan Jia, Po Keung Wong
This study provides a novel technology for the degradation of tetrabromobisphenol A (TBBPA) via an interaction of Fe redox and a shift of functional microbial community. TBBPA was degraded by integration of synthesized Fe-Ni bimetallic particles and enriched microbial consortium within an aqueous system. This cooperative integration yielded the best TBBPA-degrading capacity (100% removal after treatment for 2 h) and highest TOC-removing efficiency (94.5% removal after treatment for 96 h), as well as the lowest toxicity to Vibrio fischeri (almost 0% growth inhibition during reaction)...
June 9, 2017: Water Research
https://www.readbyqxmd.com/read/28618360/the-distribution-of-phosphorus-and-its-transformations-during-batch-growth-of-synechocystis
#14
Yun Zhou, Binh T Nguyen, Chen Zhou, Levi Straka, YenJung Sean Lai, Siqing Xia, Bruce E Rittmann
Phosphorus (P) is an essential nutrient that affects the growth and metabolism of microalgal biomass. Despite the obvious importance of P, the dynamics of how it is taken up and distributed in microalgae are largely undefined. In this study, we tracked the fate of P during batch growth of the cyanobacterium Synechocystis sp. PCC 6803. We determined the distribution of P in intracellular polymeric substances (IPS), extracellular polymeric substances (EPS), and soluble microbial products (SMP) for three initial ortho-phosphate concentrations...
June 9, 2017: Water Research
https://www.readbyqxmd.com/read/28624727/the-biogeochemical-implications-of-massive-gull-flocks-at-landfills
#15
R Scott Winton, Mark River
Gulls have long been observed concentrating in flocks of tens to hundreds of thousands at the anthropogenic food sources provided by landfills. Yet, the biogeochemical implications of the landfill gull phenomenon have been largely ignored. This study has two goals: 1) to understand the magnitude and geographic extent of landfill gulls in North America, and 2) to quantify the amount of carbon (C), nitrogen (N), and phosphorus (P) transported from landfills to gull roosting sites in order to understand their potential impacts on water quality and methane (CH4) emission...
June 8, 2017: Water Research
https://www.readbyqxmd.com/read/28622630/temporal-spatial-patterns-of-three-types-of-pesticide-loadings-in-a-middle-high-latitude-agricultural-watershed
#16
Wei Ouyang, Guanqing Cai, Mats Tysklind, Wanyin Yang, Fanghua Hao, Hongbin Liu
Pesticide loadings to watersheds increase during agricultural development and may vary in accordance with different crop types and seasons. High pesticide loadings can potentially result in polluted stream water. The objective of this study was to determine the pesticide loadings and concentrations of three typical pesticides (atrazine, oxadiazon, and isoprothiolane) in river water from a middle-high latitude agricultural watershed in northern China. During this study, we evaluated the watershed pesticide loss patterns for two crop types over three decades...
June 8, 2017: Water Research
https://www.readbyqxmd.com/read/28628881/photodegradation-and-ecotoxicology-of-acyclovir-in-water-under-uv254-and-uv254-h2o2-processes
#17
Danilo Russo, Antonietta Siciliano, Marco Guida, Emilia Galdiero, Angela Amoresano, Roberto Andreozzi, Nuno M Reis, Gianluca Li Puma, Raffaele Marotta
The photochemical and ecotoxicological fate of acyclovir (ACY) through UV254 direct photolysis and in the presence of hydroxyl radicals (UV254/H2O2 process) were investigated in a microcapillary film (MCF) array photoreactor, which provided ultrarapid and accurate photochemical reaction kinetics. The UVC phototransformation of ACY was found to be unaffected by pH in the range from 4.5 to 8.0 and resembled an apparent autocatalytic reaction. The proposed mechanism included the formation of a photochemical intermediate (ϕACY = (1...
June 7, 2017: Water Research
https://www.readbyqxmd.com/read/28624731/optimizing-mixing-mode-and-intensity-to-prevent-sludge-flotation-in-sulfidogenic-anaerobic-sludge-bed-reactors
#18
Bo Wang, Di Wu, George A Ekama, Hao Huang, Hui Lu, Guang-Hao Chen
Sludge flotation is a notorious problem in anaerobic wastewater treatment that can occur under various operational conditions and even cause the anaerobic process to completely fail. Despite having been documented for over three decades, its causes and remedies remain elusive, particularly for low-gas-production anaerobic processes such as sulfidogenic and anammox processes. This paper systematically studies sludge flotation in an anaerobic sulfidogenic process for saline domestic sewage treatment. Three lab-scale sulfidogenic reactors were operated in parallel with different modes of mixing (hydraulic, mechanical and pneumatic) at various mixing intensity levels at shear rates ranging from 0...
June 7, 2017: Water Research
https://www.readbyqxmd.com/read/28624726/holographic-characterization-of-contaminants-in-water-differentiation-of-suspended-particles-in-heterogeneous-dispersions
#19
Laura A Philips, David B Ruffner, Fook Chiong Cheong, Jaroslaw M Blusewicz, Priya Kasimbeg, Basma Waisi, Jeffrey R McCutcheon, David G Grier
Determining the size distribution and composition of particles suspended in water can be challenging in heterogeneous multicomponent samples. Light scattering techniques can measure the distribution of particle sizes, but provide no basis for distinguishing different types of particles. Direct imaging techniques can categorize particles by shape, but offer few insights into their composition. Holographic characterization meets this need by directly measuring the size, refractive index, and three-dimensional position of individual particles in a suspension...
June 7, 2017: Water Research
https://www.readbyqxmd.com/read/28618357/visualisation-study-on-pseudomonas-migulae-an-1-transport-in-saturated-porous-media
#20
Dan Qu, Hejun Ren, Rui Zhou, Yongsheng Zhao
Influence of granular size and groundwater flow rate on transport of Pseudomonas migulae AN-1 in saturated porous media was non-invasively and visually investigated with a novel imaging technique based on our previously established green fluorescent protein-tagging approach. AN-1 was transported faster than water was. The finer the media were, the greater the enhancement of bacterial velocity was. Mass recovery (MR) increased, while deposition rate coefficient (Kc) decreased, with increasing granular size. Similar and linear trends of MR and Kc, respectively, were quantitatively observed with increasing water flow rate...
June 7, 2017: Water Research
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