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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/30208011/preparation-and-characterization-of-chitosan-fe-2-o-3-nano-composite-for-the-adsorption-of-thorium-iv-ion-from-aqueous-solution
#1
B Rouhi Broujeni, A Nilchi, A H Hassani, R Saberi
In this study, novel chitosan/Fe2 O3 nano composite Ch/Fe-Onc was synthesized and evaluated as an adsorbent for removing thorium (IV) (Th4+ ) ion from aqueous solution. The Ch/Fe-Onc was characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). Response surface methodology (RSM) was used in the optimization of Th4+ adsorption for parameters such as pH, the initial metal ion concentration (Th4+ concentration) and contact time...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208010/evaluation-of-two-statistical-approaches-for-estimating-pollutant-loads-at-adjacent-combined-sewer-overflow-structures
#2
Duy Khiem Ly, Thibaud Maruéjouls, Guillaume Binet, Xavier Litrico, Jean-Luc Bertrand-Krajewski
Quantifying pollutant loads from combined sewer overflows (CSOs) is necessary for assessing impacts of urban drainage on receiving water bodies. Based on data obtained at three adjacent CSO structures in the Louis Fargue catchment in Bordeaux, France, this study implements multiple linear regression (MLR) and random forest regression (RFR) approaches to develop statistical models for estimating emitted loads of total suspended solids (TSS). Comparison between hierarchical clustering selection and random selection of CSO events for model calibration is included in model development...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208009/comprehensive-assessment-of-system-performance-in-a-full-scale-wastewater-treatment-plant-with-an-anaerobic-anoxic-aerobic-membrane-bioreactor-combined-with-the-ozonation-process
#3
Dan Wang, Yihui Wu, Fang Guo, Zhiping Li, Guangxue Wu
The system performance, economic cost and environmental impact of a full-scale anaerobic/anoxic/aerobic/membrane bioreactor (3AMBR) combined with the ozonation process were evaluated. The 3AMBR/ozonation process removed biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids, NH4 -N and total phosphorus efficiently, with removal percentages above 94%, while the total nitrogen removal percentage was only 70%. The multiple linear regression analysis showed that hydraulic retention time (HRT) had a significant effect on nitrogen removal...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208008/arsenate-removal-from-aqueous-solution-using-chitosan-coated-bentonite-chitosan-coated-kaolinite-and-chitosan-coated-sand-parametric-isotherm-and-thermodynamic-studies
#4
Cybelle M Futalan, Yu-Shen Huang, Jheng-Hong Chen, Meng-Wei Wan
In the present work, the removal efficiency of As(V) from aqueous solution using chitosan-coated bentonite (CCB), chitosan-coated kaolinite (CCK) and chitosan-coated sand (CCS) was evaluated. The chitosan-based adsorbents were characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, the Brunauer-Emmett-Teller method and thermogravimetric analysis. Kinetic studies revealed that As(V) uptake using CCB, CCK and CCS fitted well with the pseudo-second order equation (R2 ≥ 0.9847; RMSE ≤ 9...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208007/stormwater-management-in-nutrient-sensitive-watersheds-a-case-study-investigating-impervious-cover-limits-and-pollutant-load-regulations
#5
Charles C Stillwell, William F Hunt, Jonathan L Page, Joshua B Baird, Shawn G Kennedy
The objective of this research project was to compare two stormwater management strategies within a nutrient-sensitive watershed: impervious cover limits versus pollutant-load regulations. A case study was conducted in the nutrient-sensitive Falls Lake watershed in North Carolina, USA, where a commercial fitness complex was constructed in a zone previously restricted to low-density housing. The Falls Lake watershed has a stormwater regulation that limits total nitrogen and total phosphorus export loads to 2...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208006/revisiting-conceptual-stormwater-quality-models-by-reconstructing-virtual-state-variables
#6
Santiago Sandoval, Luca Vezzaro, Jean-Luc Bertrand-Krajewski
This work proposes a Bayesian non-informative reconstruction of virtual state variables in the representation of stormwater total suspended solids pollutographs by the traditional wash-off models, based on 255 rainfall events measured in a 185 ha French urban catchment. Results from event-based analyses revealed the missing representation of an essential process in the traditional rating curve (RC) model (simplest wash-off model) for 56% of the rainfall events. The unsatisfactory performances of the RC model are found to be not necessarily linked to antecedent dry weather conditions, as assumed by a great number of accumulation/wash-off models...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208005/microalgae-as-biological-treatment-for-municipal-wastewater-effects-on-the-sludge-handling-in-a-treatment-plant
#7
J Olsson, S Schwede, E Nehrenheim, E Thorin
A mix of microalgae and bacteria was cultivated on pre-sedimented municipal wastewater in a continuous operated microalgae-activated sludge process. The excess material from the process was co-digested with primary sludge in mesophilic and thermophilic conditions in semi-continuous mode (5 L digesters). Two reference digesters (5 L digesters) fed with waste-activated sludge (WAS) and primary sludge were operated in parallel. The methane yield was slightly reduced (≈10%) when the microalgal-bacterial substrate was used in place of the WAS in thermophilic conditions, but remained approximately similar in mesophilic conditions...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208004/the-influence-of-dissolved-oxygen-on-partial-nitritation-anammox-performance-and-microbial-community-of-the-200-000-m-3-d-activated-sludge-process-at-the-changi-water-reclamation-plant-2011-to-2016
#8
Yeshi Cao, Bee Hong Kwok, Mark C M van Loosdrecht, Glen Daigger, Hui Yi Png, Wah Yuen Long, Ooi Kian Eng
Mainstream partial nitritation/anammox (PN/A), coupled with excess biological phosphorus removal, in a 200,000 m3 /d step-feed activated sludge process (Train 2) in the Changi Water Reclamation Plant (WRP), Singapore, has been studied and reported. This paper presents an overview of process performance and the microbial community during the period from 2011 to 2016. The site data showed that, along with the reduction of dissolved oxygen (DO) from 1.7 to 1.0 mg O2 /L in the aeration zones, the concentrations of ammonium and nitrate of the final effluent increased, while nitrite decreased, resulting in an increase of 2...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208003/dynamics-simulation-of-ammonia-nitrogen-absorption-in-a-rural-urban-canal-on-the-northeast-china-plain
#9
Yujia Song, Xiaodong Wang, Haiying Zhang
To study dynamic laws of ammonia nitrogen retention in a typical rural-urban fringe canal, NaBr was selected as a conservative tracer agent, and NH4 Cl as an additive nutritive salt to conduct an instantaneously added tracer experiment outdoors. On this basis, tracer additions for spiralling curve characterisation (TASCC) method and nutritive spiral indexes were used for the quantitative depiction of retention dynamics of NH4 + -N. The Michaelis-Menten (M-M) model was used to simulate absorption dynamic characteristics of NH4 + -N...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208002/process-and-influencing-factors-of-n-removal-in-grassed-paving-system-by-15-n-tracing-analysis
#10
Tao Chen, Ben Zhang, Jianfeng Li, Mengzi Han
The effects of nitrogen (N) transformation and transportation processes under different soil pH, plant species and rainfall intervals were studied by using a 15 N isotope tracing technique in a simulated grassed paving system. The results showed that the grassed paving systems with three plants including Zoysia matrella (Z), Eleusine indica (E) and Liriope graminifolia (L), were effective at removing NH4 + -N, NO3 - -N, total nitrogen (TN), and chemical oxygen demand (COD) from rainfall runoff. However, there was no significant difference of TN removal among these three-plant species and a certain soil pH...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208001/ph-sensitive-microfiltration-membrane-prepared-from-polyethersulfone-grafted-with-poly-itaconic-acid-synthesized-by-simultaneous-irradiation-in-homogeneous-phase
#11
Kai Fan, Guoqing Zhou, Jinjin Zhang, Haijun Yang, Jun Hu, Zhengchi Hou
Poly(itaconic acid) (PIA) was grafted onto polyethersulfone (PES) by homogeneously phased γ-ray irradiation. Kinetic polymerization observed was studied by analyzing the effect of irradiation dosages and monomer concentrations. Then, a pH-sensitive microfiltration (MF) membrane was prepared from these PES-g-PIA polymers with different degrees of grafting under phase inversion method. Finally, the contact angles, morphologies, pore sizes, deionized water permeability and filtration performance for aqueous polyethylene glycols solution of the MF membranes were studied...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30208000/detoxification-potential-and-rehabilitation-of-activated-sludge-after-shock-loading-of-sofia-s-wastewater-treatment-plant-kubratovo-with-mazut
#12
Yana Topalova, Yovana Todorova, Irina Schneider, Ivaylo Yotinov, Vesela Stefanova
The shock loading of wastewater treatment plants (WWTPs) with toxic pollutants remains a critical problem with crucial significance for the technologies. On 5 November 2014, 30 tons of mazut were emitted in Sofia's WWTP 'Kubratovo', passing through equipment and damaging the functioning of the technological modules. The rehabilitation of activated sludge (AS) after shock loading as well as the development of detoxification activity were investigated. The hydrocarbon index of petroleum products, filamentous index (FI), sludge biotic index, sludge volume index (SVI), chemical oxygen demand (COD), biochemical oxygen demand (BOD5 ), oxygenases and succinate dehydrogenase activities were analyzed for a period of two weeks...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207999/an-assessment-of-geo-morphology-and-hydro-biological-factors-of-major-wetlands-of-bangladesh
#13
Md Habibur Rahman Molla, M Shafiqul Islam, M Aminur Rahman, Sang-Go Lee, Bushra Jahan, Jafar Iqbal, Salma Mamtaz
The present study investigates the geo-morphological features, hydro-biological profiles and resource characteristics of some selected wetlands in Brahmanbaria district, Bangladesh. Two categories of wetland have been classified on the basis of area such as the small category (40-100 ha), which belongs to 11 wetlands and the large category (100-200 ha) to nine wetlands. The mean depth of all the surveyed wetland does not exceed 3.29 ± 0.83 m. The mean value of organic matter was measured as 7.5 ± 6.34%. The maximum organic matter was recorded at Gagotia beel (24...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207998/effect-of-kaolin-on-floc-properties-for-reactive-orange-removal-in-continuous-coagulation-process
#14
Jianhai Zhao, Anmin Wang, Lei Wei, Wenqi Ge, Yongzhi Chi, Yanping Lai
Magnesium hydroxide was used as a coagulant for treating reactive orange wastewater in a real continuous process. Effects of kaolin on coagulation performance and floc properties were investigated with controlled experiments through floc size distribution, zeta potential, scanning electron microscopy and Fourier transform infrared spectroscopy. Kaolin had significant influence on magnesium hydroxide-reactive orange floc formation and growth. The results showed that average floc size reached 16.31, 12.88 and 20...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207997/removal-of-methylene-blue-from-aqueous-solution-using-sediment-obtained-from-a-canal-in-an-industrial-park
#15
Lih-Fu Chen, Hsiou-Hsuan Wang, Kao-Yung Lin, Jui-Yen Kuo, Ming-Kuang Wang, Cheng-Chung Liu
Drainage canal sediments in an industrial park are generally dredged to landfill in Taiwan. The objective of this study was to evaluate feasibility employing the sediment as an adsorbent for removal of dye. The sediment contained approximately 10% of organic matter and little heavy metals. Infrared (IR) analysis revealed that carboxyl was the most important functional group for methylene blue (MB) sorption. Canal sediment could remove the most MB from water at pH 8.0 and this removal increased with increasing temperature...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207996/purification-efficiency-of-zeolite-and-two-planted-grasses-on-sewage-and-relationship-with-carbon-nitrogen-phosphorus-ratios-in-simulated-constructed-wetland-system
#16
Xia Liu, Guohui Ning, Jianzhi Xie, Chunjing Liu, Ming Li
For achieving the economical and efficient configuration of constructed wetlands (CWs), a simulated device of vertical flow CWs was used to investigate the effects of different volume ratios of substrates to two cold-resistant plants on pollutant concentrations as well as their ratios in effluent under different inflow domestic sewage concentrations. The average removal rates (ARRs) of ammonia nitrogen, total nitrogen (TN) and total phosphorus were 82.7%, 84.9% and 80.6% respectively in the treatments with zeolite but no plants, which increased by 22...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207995/removal-of-organic-matter-from-wastewater-using-m-al-pillared-clays-m-fe-or-mn-as-coagulants
#17
Khadidja Gouttal, Abderrezak Benghalem, Goussem Mimanne, Benhabib Karim
This work is about organic matter removal from Sidi Bel Abbes wastewater plant (Algeria) by coagulation on pillared clays (PILCs) under pH and PZC (point of zero charge), conditions. Two pillared clays, M/Al-PILCs (M = Fe or Mn), were synthesized, characterized, and studied as coagulants. Results showed that Fe/Al-pillared clay exhibits superior efficiency, with 18% higher removal rate than the common coagulants alum (AS) and ferric chloride (FCl), and that sedimentation time has positive effect on turbidity removal, with 95...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207994/start-up-performance-of-anaerobic-aerobic-anoxic-sequencing-batch-reactor-sbr-augmented-with-denitrifying-polyphosphate-accumulating-organism-dpao-and-their-gene-analysis
#18
Yifang Zhang, Meng Li, Qian Zhang, Wenjiao Sang, Yiheng Jiang
This paper was aimed at investigating the bio-augmentation performance of anaerobic/aerobic/anoxic-type sequencing batch reactor (SBR) during its start-up period by introducing a strain of denitrifying polyphosphate-accumulating organism (DPAO). Two SBR reactors were inoculated to study the start-up performance, with one for DPAO introduction and the other as the control specimen. A comparison, of microbial community diversity based on the reactor which obtained a better performance, was made between polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) analyses encoded by 16S rRNA and functional genes (nirS, nirK)...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207993/performance-and-microbial-community-of-the-completely-autotrophic-nitrogen-removal-over-nitrite-process-with-a-submerged-aerated-biological-filter
#19
Xiu Yue, Zhuhan Liu, Guangping Yu, Qianhua Li, Jiali Tang
Stable performance is a technical problem in the completely autotrophic nitrogen removal over nitrite (CANON) process with one single stage, which needs to be addressed. In the current work, a laboratory-scale submerged aerated biological filter (SABF) with a 3-L working volume was introduced into the CANON process to enhance its stable performance for 290 days under the following conditions: temperature of 30 ± 1 °C and dissolved oxygen (DO) level of 0.2-0.8 mg·L-1 . The results showed that the average ammonium nitrogen removal efficiencies (ANRE) and total nitrogen removal efficiencies (TNRE) were 97...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30207992/improved-adsorption-of-congo-red-by-nanostructured-flower-like-fe-ii-fe-iii-hydroxy-complex
#20
Xiaoyan Sun, Zhongwu Liu, Zhigang Zheng, Hongya Yu, Dechang Zeng
Amorphous Fe(II)-Fe(III) hydroxy complex with flower-like nanostructure was synthesized by ferric reduction using a microwave-assisted ethylene glycol approach. Here we investigated the correlation between its chemical composition and the removal rate for Congo red (CR) dye. The results showed that the amorphous complex had similar reduction and anion exchange capacities to the green rust. Due to the synergistic effect of attractive electrostatic interaction, anion exchange, ferrous redox and hydrogen bonding, the Fe(II)-Fe(III) hydroxy complex exhibited strong adsorption of CR with an estimated adsorption capacity up to 513 mg g-1 ...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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