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Water Science and Technology: a Journal of the International Association on Water Pollution Research

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https://www.readbyqxmd.com/read/28799945/sediment-transport-modeling-in-deposited-bed-sewers-unified-form-of-may-s-equations-using-the-particle-swarm-optimization-algorithm
#1
Mir Jafar Sadegh Safari, Akbar Shirzad, Mirali Mohammadi
May proposed two dimensionless parameters of transport (η) and mobility (Fs) for self-cleansing design of sewers with deposited bed condition. The relationships between those two parameters were introduced in conditional form for specific ranges of Fs, which makes it difficult to use as a practical tool for sewer design. In this study, using the same experimental data used by May and employing the particle swarm optimization algorithm, a unified equation is recommended based on η and Fs. The developed model is compared with original May relationships as well as corresponding models available in the literature...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799944/experimental-power-of-laboratory-scale-results-and-transferability-to-full-scale-anaerobic-digestion
#2
Maximilian Lüdtke, Åke Nordberg, Christian Baresel
Anaerobic digestion is today internationally acknowledged as an environmentally sound process for energy and nutrient recovery from organic wastes, and it is the dominant sludge treatment technology in most countries' wastewater treatment plants. Laboratory- or pilot-scale experiments are commonly used as a first step to investigate the potential of new ideas or to confirm research hypothesis before confirmation in full-scale. The objectives of this study were to investigate transferability of methane yield assessments between laboratory- and full-scale, and to compare the influence of experimental uncertainties on experimental power in parallel continuous digester experiments for the two scales...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799943/laboratory-investigation-of-hydraulic-characteristics-of-fly-ash-as-a-fill-material-from-the-aspects-of-pollutant-transport
#3
Filip Stanić, Nenad Jaćimović, Anja Ranđelović, Jovan Despotović
Depending on the usage of fly ash, it is necessary to determine its environmental parameters, such as the potential for pollutant transport/leaching after its built-in. This study presents a methodology for determination of transport parameters (filtration coefficient, effective porosity, longitudinal dispersivity, and the mean residence time) from experimental data collected from column experiments with a conservative tracer on different mixtures of fly ash with stabilizers (4.8% lime and 5% cement). The transport parameters are determined using (1) numerical model results and (2) an adapted analytical solution results against measured outflow tracer concentrations...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799942/effect-of-cycle-run-time-of-backwash-and-relaxation-on-membrane-fouling-removal-in-submerged-membrane-bioreactor-treating-sewage-at-higher-flux
#4
Shamas Tabraiz, Sajjad Haydar, Paul Sallis, Sadia Nasreen, Qaisar Mahmood, Muhammad Awais, Kishor Acharya
Intermittent backwashing and relaxation are mandatory in the membrane bioreactor (MBR) for its effective operation. The objective of the current study was to evaluate the effects of run-relaxation and run-backwash cycle time on fouling rates. Furthermore, comparison of the effects of backwashing and relaxation on the fouling behavior of membrane in high rate submerged MBR. The study was carried out on a laboratory scale MBR at high flux (30 L/m(2)·h), treating sewage. The MBR was operated at three relaxation operational scenarios by keeping the run time to relaxation time ratio constant...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799941/fluidized-glass-beads-reduce-fouling-in-a-novel-anaerobic-membrane-bioreactor
#5
B Düppenbecker, S Kale, M Engelhart, P Cornel
This study focuses on the use of fluidized glass beads as turbulence promoters in a laboratory-scale anaerobic membrane bioreactor treating municipal wastewater at 20 °C. The addition of fluidized glass beads into an external tubular ceramic membrane enabled the operation at low crossflow velocities of 0.053-0.073 m/s (mean fluxes between 5.5 and 9.7 L/(m(2)·h)) with runtimes >300 h. Glass beads with a diameter of 1.5 mm were more effective than smaller ones with a diameter of 0.8-1.2 mm. Increasing the bed voidage from 74 to 80% did not show any beneficial effect...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799940/experimental-study-on-treating-agate-dyeing-wastewater-with-sulfate-reducing-bacteria-strengthening-peanut-shells-and-scrap-iron
#6
Junzhen Di, Mingxin Wang
To solve the problems of high concentrations of Cr(6+), SO4(2-) and H(+) in agate dyeing industrial wastewater and heavy pollution and high treating cost, single-factor and orthogonal experiments were conducted to determine the optimum particle size, the ratio of adsorbents dosing and hydraulic retention time based on peanut shells and scrap iron. Experiments, using five dynamic columns filled with the peanut shells, scrap iron and sulfate-reducing bacteria (SRB), were also conducted to determine the effect and mechanism of treating the wastewater...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799939/one-step-hydrothermal-synthesis-of-ctab-modified-sio2-for-removal-of-bisphenol-a
#7
Yefei Zhang, Chao Liu, Lijun Luo, Yingying Shi, Yu Chen, Shan Wang, Longchun Bian, Fengzhi Jiang
A stable SiO2 material marked as CTAB-Ms(x) was synthesized by a novel sol-gel method. It was modified with hexadecyl trimethyl ammonium bromide (CTAB), which resulted in high adsorption capacity. Its microstructure and surface functional groups were characterized by scanning electron microscope, transmission electron microscope and Fourier transform infrared. The results showed that CTAB-Ms(x) had a core/shell structure in which the core was a CTAB micelle and the shell was SiO2. The prepared material was applied to adsorb bisphenol A (BPA)...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799938/improvement-of-phosphorus-removal-by-calcium-addition-in-the-iron-electrocoagulation-process
#8
I Mishima, M Hama, Y Tabata, J Nakajima
Small-scale wastewater treatment plants (SWTPs) are widely used as decentralized wastewater treatment systems in sparsely populated areas of Japan. Iron electrolysis, an electrocoagulation technology, is installed in these SWTPs for phosphorus removal. Phosphorus can be removed via the formation of an insoluble compound containing phosphate and iron, such as FePO4; however, it was necessary to determine the conditions under which phosphorus can be effectively and stably removed in actual SWTPs. According to previous studies using iron compounds, improved phosphorus removal was obtained by Ca addition...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799937/multi-criteria-analysis-of-site-selection-for-groundwater-recharge-with-treated-municipal-wastewater
#9
Mohammad Mehdi Ahmadi, Hadi Mahdavirad, Bahram Bakhtiari
Geographic information systems (GIS) and remote sensing techniques are used as a decision support system to identify potential soil aquifer treatment (SAT) sites for groundwater recharge of Kerman aquifer, which is located in the southeast of Iran. These sites are identified using a single-objective multi-criteria analysis. To ensure technical feasibility, environmental sustainability, social acceptability and economical viability a number of criteria are considered for the site selection. The criteria selected for the different variables and acceptable ranges are based on standards published in national and international guidelines and technical documents...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799936/oily-wastewater-treatment-by-adsorption-membrane-filtration-hybrid-process-using-powdered-activated-carbon-natural-zeolite-powder-and-low-cost-ceramic-membranes
#10
Yaser Rasouli, Mohsen Abbasi, Seyed Abdollatif Hashemifard
In this research, four types of low cost and high performance ceramic microfiltration (MF) membranes have been employed in an in-line adsorption-MF process for oily wastewater treatment. Mullite, mullite-alumina, mullite-alumina-zeolite and mullite-zeolite membranes were fabricated as ceramic MF membranes by low cost kaolin clay, natural zeolite and α-alumina powder. Powdered activated carbon (PAC) and natural zeolite powder in concentrations of 100-800 mg L(-1) were used as adsorbent agent in the in-line adsorption-MF process...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799935/effects-of-toxic-microcystis-genotypes-on-natural-colony-formation-and-mechanism-involved
#11
Xiangdong Bi, Wei Dai, Shulin Zhang, Shaojie Dong, Dajuan Zhang
The cyanobacterium Microcystis occurs as colonies of different sizes with varying abundance of toxic genotypes versus non-toxic genotypes under natural conditions. To investigate the effects of toxic Microcystis genotypes on natural colony formation, samples collected from the mainstream of Haihe River from July to October 2015 were sieved into four colony classes with sizes of <8 μm, 8-20 μm, 20-90 μm and >90 μm. Each colony size class was analyzed for the proportion of toxic Microcystis genotypes, and microcystins (MCs) cellular production of toxic genotypes...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799934/partially-aerated-submerged-fixed-film-bioreactor-for-simultaneous-removal-of-carbon-and-nutrients-from-high-strength-nitrogen-wastewaters-effect-of-aeration-rate-and-c-n-p-ratio
#12
Mojtaba Forouzesh, Ali Baradar Khoshfetrat, Salman Alizadeh Kordkandi
Influence of aeration rate and COD:N:P (C:N:P) ratio on the performance of an upflow partially aerated submerged fixed film (UP/ASFF) bioreactor for simultaneous carbon and nutrient removal from high-strength nitrogen wastewater was investigated during 6 months. Airflow rates at three levels of 1.5, 3, and 4.5 L/min and C:N:P ratios at four levels of 450:300:10, 450:150:10, 450:100:10, and 450:75:10 were selected as the two main input factors. All experiments were performed at constant chemical oxygen demand (COD), phosphorus (P) and hydraulic residence time of 450 mg COD/L, 10 mg PO4(3-) -P/L and 7...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799933/heavy-metal-content-of-swedish-municipal-wastewater-sludge-status-and-goals
#13
A Mattsson, A Finnson, D I'Ons
In 2014, 25% of the sludge produced at Swedish municipal wastewater treatment plants was applied to agricultural land. Even though the Swedish heavy metal limits for sludge to be used in agriculture are amongst the most stringent in the EU, more stringent heavy metal limits are proposed. Most sludge applied to agricultural land is recycled within a certification system, Revaq. Revaq has targets for control at source management and improvement of sludge quality. Statistics based on data collected within the Revaq system was used to differentiate between local and general sources of heavy metals and assess the need to improve sludge quality...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799932/ni-ii-and-cu-ii-removal-from-aqueous-solution-by-a-heavy-metal-resistance-bacterium-kinetic-isotherm-and-mechanism-studies
#14
Haikun Zhang, Xiaoke Hu, Hong Lu
The potentiality of a heavy metal-resistance bacterium Acinetobacter sp. HK-1 for removing Ni(II) and Cu(II) ions from aqueous solution and the biosorption mechanism were investigated in this study. The effects of pH, contact time and Ni(II)/Cu(II) concentration on the adsorption process were evaluated and the maximum biosorption capacity of strain HK-1 was found to be 56.65 mg/g for Ni(II) and 157.2 mg/g for Cu(II), respectively. The experimental kinetic data fit well with the pseudo-second-order model (R(2) > 0...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799931/study-on-non-linear-equilibrium-kinetics-and-thermodynamic-of-deltamethrin-removal-in-aqueous-solution-using-modified-magnetic-iron-oxide-nanoparticles
#15
Bahareh Ghafari, Elham Moniri, Homayon Ahmad Panahi, Abdolreza Karbassi, Shaban Najafpour
The purpose of modification of magnetic iron oxide nanoparticles is an eco-friendly, emerging and economical method for removing deltamethrin in the aqueous solution and wastewater effluents when compared with other adsorbent methods. Modified magnetic iron oxide nanoparticles were synthesized by co-precipitation and then coupled with 3-hydroxytyraminium chloride. The nano-sorbent was characterized by thermogravimetric analysis, elemental analysis, transmission electron microscopy, scanning electron microscope, Fourier transform infrared spectroscopy, zero point charge and surface area determination...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799930/screening-of-organic-pollutants-in-urban-wastewater-treatment-plants-and-corresponding-receiving-waters
#16
Ann-Kathrin Wluka, Laura Coenen, Jan Schwarzbauer
There is a lack of knowledge in environmental pollution of the anthropogenic contaminants in wastewater and surface water. Several organic compounds merit special attention, because of their potential risk to the aquatic environment. Therefore, gas chromatography-mass spectrometry-based screening analyses were performed in order to identify anthropogenic organic contaminants and to reveal information on the structural diversity of individual compounds and to characterize their environmental behavior. Wastewater samples from wastewater treatment plants in Germany, representing various capacities, and surface water samples from corresponding receiving waters were analyzed...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799929/scaling-up-of-a-zero-valent-iron-packed-anaerobic-reactor-for-textile-dye-wastewater-treatment-a-potential-technology-for-on-site-upgrading-and-rebuilding-of-traditional-anaerobic-wastewater-treatment-plant
#17
Yang Li, Jingxin Zhang, Yaobin Zhang, Xie Quan
Anaerobic digestion (AD) is a cost-effective technology for the treatment of textile dye wastewater with clear environmental benefits. However, the need to improve process feasibility of high treatment efficiency as well as to shorten hydraulic retention time has raised interest on several intensification techniques. Zero valent iron (ZVI) packed anaerobic digesters have the potential to become an on-site upgrading wastewater treatment technology through building a ZVI bed in a traditional AD plant. However, the experiences and knowledge of scale-up are limited...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799928/greywater-characterization-and-handling-practices-among-urban-households-in-ghana-the-case-of-three-communities-in-kumasi-metropolis
#18
Bismark Dwumfour-Asare, Philomina Adantey, Kwabena Biritwum Nyarko, Eugene Appiah-Effah
Greywater management in Ghana receives little or no attention although untreated greywater is associated with environmental and public health risks. This paper assesses greywater characteristics and handling practices among urban households in three selected communities in Kumasi, the second largest city of Ghana. The study involved in-depth surveys (interviews and observations) with 90 households, and collection of 18 greywater samples from nine greywater sources for laboratory analysis. Average greywater generation is 43...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799927/heavy-metal-tolerance-and-removal-potential-in-mixed-species-biofilm
#19
Sandra Grujić, Sava Vasić, Ljiljana Čomić, Aleksandar Ostojić, Ivana Radojević
The aim of the study was to examine heavy metal tolerance (Cd(2+), Zn(2+), Ni(2+) and Cu(2+)) of single- and mixed-species biofilms (Rhodotorula mucilaginosa and Escherichia coli) and to determine metal removal efficiency (Cd(2+), Zn(2+), Ni(2+), Cu(2+), Pb(2+) and Hg(2+)). Metal tolerance was quantified by crystal violet assay and results were confirmed by fluorescence microscopy. Metal removal efficiency was determined by batch biosorption assay. The tolerance of the mixed-species biofilm was higher than the single-species biofilms...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799926/daily-runoff-prediction-using-the-linear-and-non-linear-models
#20
Alireza Sharifi, Yagob Dinpashoh, Rasoul Mirabbasi
Runoff prediction, as a nonlinear and complex process, is essential for designing canals, water management and planning, flood control and predicting soil erosion. There are a number of techniques for runoff prediction based on the hydro-meteorological and geomorphological variables. In recent years, several soft computing techniques have been developed to predict runoff. There are some challenging issues in runoff modeling including the selection of appropriate inputs and determination of the optimum length of training and testing data sets...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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