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

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https://www.readbyqxmd.com/read/28488571/performance-study-of-a-low-cost-adsorbent-raw-date-pits-for-removal-of-azo-dye-in-aqueous-solution
#1
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
#2
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
#3
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
#4
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/28357979/adsorption-of-as-v-cd-ii-and-pb-ii-in-multicomponent-aqueous-systems-using-activated-carbons
#5
Gerardo Cruz
This paper studies the use of two activated carbon samples made of cocoa pod husk (CPH-AC) and one commercial activatedcarbon sample in the adsorption of As(V), Cd(II) and Pb(II) from multicomponent synthetic solutions and from the Puyango-Tumbes River water, a river located in northwest Peru. The characterization of the activated carbon samples was conducted. The CPH-AC samples exhibited a specific surface area (SBET) between 709 and 1117 m2/g and a pH point of zero charge (pHPZC) between 4.4 ± 0.2 and 5 ± 0...
March 29, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28332469/marrying-step-feed-with-clarifier-improvements-increase-wet-weather-capacity-integrated-methodology
#6
Glen T Daigger John S Siczka Thomas F Smith David A Frank J A McCorquodale
The need to increase the peak wet weather secondary treatment capacity of the City of Akron, OH, Water Reclamation Facility (WRF) provided the opportunity to test an integrated methodology for maximizing the peak wet weather secondary treatment capacity of activated sludge systems. An initial investigation, consisting of process modeling of the secondary treatment system and computational fluid dynamics (CFD) analysis of the existing relatively shallow secondary clarifiers (3.3 and 3.7 m sidewater depth in 30...
March 22, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28327258/development-of-multiple-regression-models-to-predict-sources-of-fecal-pollution
#7
Kimberlee K Hall And Phillip R Scheuerman
This study assessed the usefulness of multivariate statistical tools to characterize watershed dynamics and prioritizestreams for remediation. Three multiple regression models were developed using water quality data collected from Sinking Creek in the Watauga River watershed in Northeast Tennessee. Model 1 included all water quality parameters, model 2 included parameters identified by stepwise regression, and model 3 was developed using canonical discriminant analysis. Models were evaluated in seven creeks to determine if they correctly classified land use and level of fecal pollution...
March 21, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28327257/determining-the-mechanism-for-low-sludge-yields-in-the-cannibal%C3%A2-solids-reduction-system
#8
Steven W Van Ginkel Joseph Miceli Bi-O Kim Ziming Yang Michelle Young Andrew Marcus And Bruce E Rittmann
Extracellular polymeric substances (EPS) and solids concentrations in samples from the Interchange Bioreactor (IBR) andreturn activated sludge (RAS) from Cannibal® plants having low and high sludge yields were analyzed to understand the mechanisms behind low sludge production. Low sludge yields correlated to more EPS degradation, higher concentrations of iron, and reducing conditions in the IBR. In the low-yield plants, iron was reduced when the RAS passed through the anaerobic and reducing conditions of the IBR, and this led to more EPS solubilization and degradation...
March 16, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28337963/enhanced-treatment-properties-of-iron-oxide-amended-sands-coupled-with-polyelectrolyte-to-humic-acid
#9
Dongmei Li Cuiru Wu Yizhi Wang Shuxian Jiang Shaoxiu Li Jinling Liang Wen Zhang
To improve the removal efficiency of micro-pollutant humic acid (HA) at low temperature, micro-flocculation filtrationexperiments were conducted with homemade iron oxide amended sands (IOAS), cationic polyelectrolyte (CP) and polyaluminium chloride (PACl). Fractal properties of flocs structures and IOAS surface and their effects on the removal efficiency of HA were investigated. Results showed that IOAS had a porous surface with fractal dimensions (D=1.744) and a strong adsorption capacity for HA. The flocs produced by PACl were small in size, loosely packed with a higher D, and therefore settled slowly...
March 14, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28337961/biosorption-of-heavy-metals-from-aqueous-solution-by-bacteria-isolated-from-contaminated-soil
#10
Pradeep Dhanwal Anil Kumar Shruti Dudeja Hemlata Badgujar Rohit Chauhan Abhishek Kumar Poonam Dhull Vinod Chhokar Vikas Beniwal
The study was carried out to analyze the heavy metals biosorption potential of bacteria isolated from electroplating industrial effluents contaminated soil. Bacterial isolates were screened for their multi-metal biosorption potential against copper, nickel, lead and chromium. Bacterial isolate CU4A showed maximum uptake of copper, nickel, lead and chromium in aqueous solution with biosorption efficiency as 87.16 %, 79.62%, 84.92% and 68.12%, respectively. The bacterial strain CU4A was identified as Bacillus cereus following 16S rRNA gene sequence analysis...
March 9, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28276318/biosorption-of-copper-ii-from-aqueous-solutions-by-sclerotiogenic-aspergillus-oryzae-g15
#11
Dan-Dan Long Qi Wang Jian-Rong Han
This study aimed at investigating the biosorption of the copper(II) from aqueous solutions by sclerotiogenic Aspergillus oryzae G15. Potentiometric titration analysis results indicated that carboxyl group was mainly responsible for Cu(II) adsorption. Sclerotia were superior biosorbent than mycelia, which could be ascribed to the higher amount of carboxyl sites exposed after differentiation. Langmuir isotherm model fitted well the absorption process of mycelia and sclerotia with the maximum theoretical sorption capacities of 35...
March 8, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28271819/modelization-and-statistical-optimization-of-coagulation-flocculation-treatment-of-an-old-leachate
#12
Ridha Lessoued Fatiha Souahi Leonor C Pelaez
Coagulation/flocculation process was studied using the response surface methodology (RSM) and central composite design(CCD), in order to design the experiments, develop models, evaluate the relationship between operating factors (FeCl3 dose (m) and pH), and provide an efficient method for the treatment of old leachates. The quadratic polynomial models developed for COD and turbidity responses indicated that the optimum conditions were m of 0.82 g/L at pH 5.33 with coefficient of determination R² of 98.88%, 99...
March 7, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28357978/monochloramine-loss-mechanisms-in-tap-water
#13
Qianyi Zhang Evan G R Davies James Bolton Yang Liu
Chloramination has been widely applied for drinking water disinfection, with monochloramine (NH₂Cl) the dominant chloramine species. However, under neutral pH, NH₂Cl can autodecompose and react with chemical components in drinking water, thus decreasing disinfection efficiency. In tap water, the NH₂Cl loss rate can be influenced by temperature, pH, Cl/N molar ratio, the initial NH₂Cl concentration and the natural organic matter (NOM) concentration. A good prediction of NH2Cl loss can assist in the operation of drinking water treatment plants...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28276308/why-is-the-groundwater-level-rising-a-case-study-using-hartt-to-simulate-groundwater-level-dynamics
#14
Yohannes Yihdego Cara Danis Andrew Paffard
Groundwater from a shallow unconfined aquifer at a site in coastal New South Wales has been causing recent water logging issues. A trend of rising groundwater level has been anecdotally observed over the last 10 years. It was not clear whether the changes in groundwater levels were solely natural variations within the groundwater system or whether human interference was driving the level up. Time series topographic images revealed significant surrounding land use changes and human modification to the environment of the groundwater catchment...
February 24, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28442008/biotransformation-of-rdx-and-hmx-by-anaerobic-granular-sludge-with-enriched-sulfate-and-nitrate
#15
Chunjiang An, Yarong Shi, Yanling He, Guohe Huang, Yonghong Liu, Shucheng Yang
  RDX and HMX are widely used energetic materials and they are recognized as environmental contaminants at numerous locations. The present study investigated the biotransformation of RDX and HMX by anaerobic granular sludge under sulfate- and nitrate-enriched conditions. The results showed that RDX and HMX could be transformed by anaerobic granular sludge when nitrate was present. However, the biotransformation of RDX and HMX was negatively influenced, especially with high nitrate concentrations. Sulfate-enriched conditions were more favorable for the removal of ammunition compounds by anaerobic granular sludge than nitrate-enriched conditions...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28442007/evaluation-of-b-cereus-mtcc-25641-for-the-treatment-of-dairy-waste-effluent
#16
Kunal Gawai, Kanchan Mogha, Jashbhai Prajapati
  Dairy is one of the industries producing wastewater rich in organic matter and thus leading to creation of odorous and high COD containing effluent. Biotreatment leading to bioconversion of the waste materials is probably the most cost-effective technique for managing and utilizing waste. A pilot-scale aerobic treatment plant showing air pressure of 6 kg/cm3 was designed keeping all the conditions similar to the main aerobic plant of any dairy plant. The COD (Chemical Oxygen Demand) of the control effluent i...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28442006/meta-modeling-based-groundwater-remediation-optimization-under-flexibility-in-environmental-standard
#17
Li He, Zongda Xu, Xing Fan, Jing Li, Hongwei Lu
  This study develops a meta-modeling based mathematical programming approach with flexibility in environmental standards. It integrates numerical simulation, meta-modeling analysis, and fuzzy programming within a general framework. A set of models between remediation strategies and remediation performance can well guarantee the mitigation in computational efforts in the simulation and optimization process. In order to prevent the occurrence of over-optimistic and pessimistic optimization strategies, a high satisfaction level resulting from the implementation of a flexible standard can indicate the degree to which the environmental standard is satisfied...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28442005/implications-of-using-different-water-sources-when-hydrologically-compacting-bioretention-columns
#18
Clayton A Stahnke, Cara J Poor
  Many investigators have conducted research on bioretention systems both in the laboratory and field. There is little consensus on which sources of water are best suited to hydrologically compact bioretention columns. Water with low ionic strength can leach ions from soil media, resulting in a different soil chemistry environment than would be found in typical bioretention applications. Soil columns were hydrologically compacted with three different water sources often used in column studies: deionized water, tap water, and rain water...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28442004/multi-response-optimization-of-process-parameters-for-imidacloprid-removal-by-reverse-osmosis-using-taguchi-design
#19
Nevim Genç, Esra Can Doğan, Ali Oğuzhan Narcı, Emine Bican
  In this study, a multi-response optimization method using Taguchi's robust design approach is proposed for imidacloprid removal by reverse osmosis. Tests were conducted with different membrane type (BW30, LFC-3, CPA-3), transmembrane pressure (TMP = 20, 25, 30 bar), volume reduction factor (VRF = 2, 3, 4), and pH (3, 7, 11). Quality and quantity of permeate are optimized with the multi-response characteristics of the total dissolved solid (TDS), conductivity, imidacloprid, and total organic carbon (TOC) rejection ratios and flux of permeate...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28442003/lipid-production-for-biodiesel-from-sludge-and-crude-glycerol
#20
Xiaolei Zhang, Jiaxin Chen, Song Yan, Rajeshwar Dayal Tyagi, Rao Y Surampalli, Ji Li
  Oleaginous yeast Trichosporon oleaginosus was studied for lipid production using municipal sludge with or without fortification of crude glycerol in a 15-L fermenter. The maximum lipid content (concentration) was 32.0% w/w (9.35 g/L), 33.6% (10.13 g/L), 33.3% (9.13 g/L), and 33.1% (9.03 g/L) w/w with the addition of 25, 50, 100, and 150 g/L glycerol, respectively. Glycerol concentration had little effect on lipid accumulation. However, glycerol concentration substantially affected increase of biomass concentration and cell count...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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