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Water Environment Research: a Research Publication of the Water Environment Federation

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https://www.readbyqxmd.com/read/28646570/inactivation-of-bacillus-spores-in-wash-waters-using-dilute-chlorine-bleach-solutions-at-different-temperatures-and-ph-levels
#1
Vicente J Gallardo, Donald A Schupp, John L Heckman, E Radha Krishnan, Eugene W Rice
Inactivation of Bacillus globigii spores in wash water was studied to simulate chlorine inactivation of Bacillus anthracis spores in water generated in during biological clean ups. Eight waters were studied, with six containing detergent. Chlorine levels were approximately 3,000 mg/L. Results across different waters showed decreasing inactivation with increasing pH. Inactivation did not appear to be influenced by chemical oxygen demand, suspended solids, turbidity, or dissolved solids. Inactivation efficacy was expressed as the time calculated to yield 6 log10 inactivation at 3,000 mg NaOCl/L...
June 23, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28646571/comparison-of-reed-water-lettuce-in-constructed-wetland-for-sewage-water-treatment
#2
Abdullah Yasar, Ayesha Zaheer, Amtul Bari Tabinda, Marryam Khan Yusra Mahfooz
In the present study two designs Vertical and Horizontal system were used and two different plant species, water lettuce (Pistia stratiotes) and reed plant (Phragmites karka) were compared for their removal efficiency. Vertical system appeared to be more stable and efficient for almost all the parameters. Vertical planted with water lettuce showed % removal efficiency for BOD, phosphate and chloride as 82, 95.4 and 51 respectively while turbidity and total suspended solids (TSS) removal efficiency was almost same...
June 21, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28646572/general-fate-model-for-microconstituents-in-an-activated-sludge-system
#3
Bahman Banihashemi
Nine lab-scale continuous flow porous-pot bioreactors operating at various solids retention times and hydraulic retention times were conducted to simulate activated sludge (AS) systems and to evaluate the biodegradation kinetic models for the fate of 17α-ethinylestradiol (EE2), bisphenol-A (BPA), and triclosan (TCS) at the µg/L range. Mathematical models were applied to describe the degradation mechanism of selected microconstituents (MCs) and pseudo second-order model were found to best fit the results when active MCs degraders (XC) were used (r2= 0...
June 16, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28600861/efficient-adsorptive-removal-of-toxic-amaranth-dye-from-water-using-a-zeolitic-imidazolate-framework
#4
Kun-Yi Andrew Lin And Chang-Husan Wu
Adsorbents reported to remove a toxic acidic azo dye, Amaranth (AMR) are very limited, and their typical adsorption capacities are quite low. Recently, a zeolitic imidazolate framework (ZIF-67) has been proposed as a novel adsorbent as ZIF-67 possesses high surface area, superior chemical stability in water and positive charges, making it a promising adsorbent for AMR. Nevertheless, no studies have been conducted to investigate the adsorption of AMR to ZIF-67. Herein, ZIF-67 is employed for the first time to remove AMR from water via adsorption...
June 9, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28600862/augmentation-of-water-resources-potential-and-cropping-intensification-through-watershed-programmes
#5
Biswajit Mondal
This paper presents the biophysical impact of various interventions made under watershed development programmes in terms of creation of additional water resources and resultant changes in land use and cropping pattern in Bundelkhand region of Madhya Pradesh State, India. Both primary and secondary data gathered from randomly selected watersheds and their corresponding control villages were used in this study. Analysis revealed that emphasis was given primarily on creation of water resources potentials during implementation of the programmes, which led to augmentation of surface and ground water availability for both irrigation as well as non-agricultural purposes...
June 7, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28577311/acclimation-of-2-chlorophenol-biodegrading-activated-sludge-and-microbial-community-analysis
#6
(no author information available yet)
Taking glucose as co-substrate, the activated sludge which could effectively biodegrade 2-chlorophenol (2-CP) of 40 mg/L was successfully domesticated after acclimation for 49 days in sequencing batch reactors. High-throughput sequencing (HTS) analysis revealed that the community richness initially increased for 5 days and then decreased after another 20 days with the increase of 2-CP. The original sludge obtained from water resource recovery facility had the highest diversity. At the beginning of acclimation, the community diversity decreased...
June 2, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28569237/pharmaceutical-and-endocrine-disruptor-compounds-in-surface-and-wastewater-in-san-marcos-tx
#7
R P Oates David Klein Glenn Longley Pamela Hamlett
Water Resource Recovery Facilities (WRRFs) and hospitals are major point sources of pharmaceuticals and endocrine disrupting compounds (EDCs) in aquatic environments. This study investigated the removal efficiencies of 23 known or suspected EDCs through the San Marcos WRRF to determine which treatment process was the most effective at removal. Results from samples collected at the hospital indicate that the hospital discharge is contributing to the concentration of these compounds in the San Marcos wastewater collection system (0...
May 31, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28537219/organism-detection-in-permeable-pavement-parking-lot-infiltrates-at-edison-environmental-center-nj
#8
Ariamalar Selvakumar And Thomas P O'Connor
Three types of permeable pavements were monitored at the Edison Environmental Center in Edison, New Jersey for indicator organisms such as fecal coliform, enterococci, and E. coli. Results showed that porous asphalt had a much lower concentration in monitored infiltrate compared to pervious concrete and permeable interlocking concrete pavers; concentrations of monitored organisms in infiltrate from porous asphalt were consistently below the bathing water quality standard and actually had limited detection. Fecal coliform and enterococci exceeded bathing water quality standards more than 72% and 34% of the time for permeable interlocking concrete pavers and pervious concrete, respectively...
May 23, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28569231/adsorption-kinetics-of-137cs-90sr2-on-ca-bentonite
#9
Rong Wang Yingying Chu Mengjun Chen
137Cs+/90Sr2+ adsorption kinetics on natural Ca-bentonite under the impact of different adsorption conditions was examined in detail. The results indicate that natural Ca-bentonite shows a strong adsorption capacity for Cs+/Sr2+. The adsorption reached at equilibrium after 2 h for Cs+. Cs+/Sr2+removal efficiency reaches the highest when the pH value is 5-8 and increases with the increase of Ca-bentonite adding amount. Cs+ removal efficiency increases with the increase of Cs+ initial concentration, while Sr2+ removal efficiency slightly varies around 70%...
May 19, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28569232/relationship-among-phosphorus-content-in-water-sediment-interface-in-middle-temperate-grassland
#10
E Jing Su Derong Lv Shihai Diao Zhaoyan Bu He Zheng Zhirong Ye Shengxing
In order to reveal the dynamic changes of phosphorus release from the sediments of the wetlands in mid-temperature steppe without external phosphorus input, the relationship among the phosphorus content in the overlying water, sediment and interstitial water was studied by using variables control method. In July of 2015, the undisturbed sediments and corresponding overlying water from the sediment-water interface of Hulunbeier steppe, China were selected (included Yimin River midstream (YM) wetland, Muqiao section (HM) wetland, Swan Lake (TE) wetland, Xiboqiao section (HX) wetland, Huihe and Yi Min River Interchange (HY) wetland and Hulun lake (HH) wetland) and cultured in wetland habitat simulator...
May 18, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28577313/a-nanofiltration-decision-tool-for-potable-reuse-a-new-rejection-model-for-recalcitrant-cecs
#11
Steven M Jones PhD Pe Michael J Watts PhD Pe Zaid K Chowdhury PhD Pe Bcee And S Ranil Wickramasinghe PhD Pe
Effluent samples from three (3) WRRFs were individually characterized for presence and concentration of 94 different chemicals of emerging concern (CECs), utilizing analytical methods with reporting limits in the low-parts-per-trillion. Following CEC analysis, each sample was subjected to dead-end, pressurized membrane filtration with either a nanofiltration (NF) or reverse osmosis (RO) membrane. The majority of the measured CECs were rejected by both membranes by 1-log removal (90%) or greater. However, nine (9) of the 94 CECs had average rejection rates by the NF membrane less than 90%...
May 12, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28577312/biodegradation-of-a-laundry-wastewater-under-aerobic-and-anaerobic-conditions-a-kinetic-evaluation
#12
Keerthi Katam And Debraj Bhattacharyya
This research was conducted in a batch mode in a laboratory-scale setup to study 1. the biodegradation of laundry wastewater under aerobic and anaerobic conditions and to quantify the degradation at steady-state in terms of kinetic parameters and 2. the inhibition caused by the laundry wastewater on growth-substrate utilization by un-acclimated ethanol-enriched aerobic and anaerobic microbial cultures. The Chemical Oxygen Demand (COD) removal was above 95% under aerobic condition; however, the COD removal varied between 70 and 88% under anaerobic condition...
May 12, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28488571/performance-study-of-a-low-cost-adsorbent-raw-date-pits-for-removal-of-azo-dye-in-aqueous-solution
#13
Hachani Rahima Hazourli Sabir Nouacer Sana Khelaifia Fatma Zohra Nait Merzoug Nesrine
The feasibility of using natural waste (raw date pits) as a low-cost adsorbent for the adsorption of an anionic dye (Congo red) from aqueous solution has been investigated. Adsorption optimized conditions were obtained at low dose 1 g/L, initial dye concentration 100 mg/L, pH 2, equilibrium contact time 120 min, and temperature 20 °C. The corresponding adsorption capacity was around 70 mg/g and could reach 150 mg/g by increasing the ionic strength of the dye solution (0.05 M CaCl2). These results are well modeled by Freundlich isotherm and kinetics study followed by pseudo second-order model...
May 9, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28488568/life-cycle-energy-analysis-of-reclaimed-water-reuse-projects-in-beijing
#14
Yupeng Fan Erhui Guo Yuanzheng Zhai Andrew C Chang Qi Qiao Peng Kang
To illustrate the benefits of water reuse project, the process-based life cycle analysis (LCA) could be combined with input-output life cycle analysis to evaluate the water reuse project. Energy is the only evaluation parameter used in this study. Life cycle assessment of all energy inputs (LCEA) is completed mainly by the life cycle inventory (LCI), taking into account the full life cycle including the construction, the operation, and the demolition phase of the project. Assessment of benefit from water reuse during the life cycle should focus on sewage discharge reduction and water-saving benefits...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28488570/synergy-effects-of-hydrodynamic-conditions-and-surfactant-on-sorption-behavior-of-bisphenol-a
#15
Peng Wang Yidan Wang Zulin Hua Chen Li Xia Shen Xiaodong Liu Xue Bai
: The synergy effects of hydrodynamic conditions and cetyl trimethylammonium bromide (CTAB) on the distribution behavior of BPA in sediment have been investigated using particle entrainment simulator (PES) and water bath shaker. The results showed that when the concentration of CTAB is below its critical micelle concentration (CMC), the shear stress has almost no impact on the equilibrium sorption amount of BPA on sediment, which is mainly related to the surfactant concentration. The sorption rates in the rapid sorption phase increased with increasing CTAB content and shear stress...
April 27, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28406081/ecotoxicological-analysis-of-acrylamide-using-a-microalga-as-an-indicator-organism
#16
Bárbara Werle Nunes Keila Fernanda Hedlund Maria Angelica Oliveira And Elvis Carissimi
Aquatic ecosystems are very prone to contamination. The fast and accurate assessment of the toxicity of the water is animportant tool for environmental safety. The aim of this study was to assess the possible toxic effects of acrylamide on physiological parameters of the ChlorophyceaeandDesmodesmus quadricauda. Cells in exponential growth phase were exposed for 72 hours to different concentrations of acrylamide. Light microscopy analysis documented cell density, number of cells per coenobia, cell dimensions, and biovolume; chlorophyll "a" concentration was also determined...
April 12, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28641675/the-application-of-solar-cells-in-the-electrokinetic-remediation-of-metal-contaminated-sediments
#17
Natasa S Varga, Bozo D Dalmacija, Miljana Dj Prica, Djurdja V Kerkez, Milena Dj Becelic-Tomin, Jelena M Spasojevic, Dejan S Krcmar
  In this study, solar cells were used to generate an electric field for the electrokinetic remediation of metal contaminated sediment (Nickel, Cadmium, Zinc). For determination of metals mobility, bioavailability and potential toxicity, sequential extraction procedure, simultaneously extracted metals (SEM) and acid-volatile sulphide ratios (AVS) were performed before, during and after treatment.After 21 days of treatment, 63% Ni, 82% Cd and 58% Zn was removed from the anode region. The application of the electric field changed the chemical composition of the sediments...
July 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28641674/removal-of-organic-matter-and-etodolac-from-pharmaceutical-industry-wastewater-by-pac-adsorption
#18
Ilda Vergili, Sezin Gencdal
  The removal of organic matter and etodolac (an anti-inflammatory pharmaceutical) from a real process wastewater by using powdered activated carbon (PAC) adsorption before and after Fenton oxidation has been studied. The wastewater sample is collected from the final stage of chemical synthesis of a pharmaceutical (etodolac). Fenton oxidation resulted with decrease in chemical oxygen demand (84% removal) and etodolac concentration was reduced to 0.7 mg L-1. Optimum adsorption equilibrium conditions were found as t = 16 hours, and m = 10 g L-1...
July 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28641673/renewable-modified-cellulose-bearing-chelating-schiff-base-for-adsorptive-removal-of-heavy-metal-ions-and-antibacterial-action
#19
R Saravanan, L Ravikumar
  A novel approach toward chemically modified cellulose bearing active chelating Schiff base with hydroxyl group (Cell-Hy) was synthesized. The modified cellulose was examined for its heavy metal ion uptake potential from aqueous solution. The chemical and structural features of the adsorbent were characterized by Fourier transform infrared spectroscopy (FT-IR), solid state 13C-NMR, Scanning Electron Microscopy (SEM), and energy dispersive analysis of X-ray (EDAX) observations. The experimental conditions and adsorption parameters, including pH, initial metal ion concentration, adsorbent dosage, temperature, and contact time were optimized for the removal of Cu(II) and Pb(II) ions...
July 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28641672/determination-of-five-alternative-antifouling-agents-found-along-the-korean-coasts
#20
Seongeon Lee, Dongsup Lee, Yong-Woo Lee
  Since the ban of tri-butyl tin, other various alternative antifouling agents have been used. In this study, the contamination levels from these antifouling agents were examined in the main harbors in Korea. The sampled harbors were classified into four types and the levels of contamination from the antifouling agents were analyzed. The highest degree of contamination was found in the big harbors, followed by the fishing harbors, harbors near agricultural areas, and military and coast guard harbors. In addition, an increase in the number of ships that entered the ports significantly influenced the contamination by the antifouling agents...
July 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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