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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/29144313/preliminary-results-of-water-quality-assessment-using-phytoplankton-and-physicochemical-approaches-in-the-huai-river-basin-china
#1
Hao Chen, Qi-Ting Zuo, Yong-Yong Zhang
Water pollution has been a significant issue in the Huai River Basin (HRB) of China since the late 1970s. In July and December 2013, two field investigations were carried out at 10 sites along the main streams of the basin. The monitoring indices contained both physicochemical variables and the structure and composition of phytoplankton communities. The correlations between communities and physicochemical variables were analyzed using cluster analysis and redundancy analysis. Moreover, water quality was evaluated using the comprehensive nutrition state index (TLI) and Shannon-Wiener diversity index (H)...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144312/effectiveness-of-septage-pre-treatment-in-vertical-flow-constructed-wetlands
#2
Beata Karolinczak, Wojciech Dąbrowski
Septage is wastewater stored temporarily in cesspools. A periodic supply of its significant quantities to small municipal wastewater treatment plants (WWTPs) may cause many operational problems. In the frame of the research, it has been proposed to utilize vertical flow constructed wetlands for pre-treatment of septage prior to its input to the biological stage of a WWTP. The aim of the work was to assess the effectiveness of pre-treatment in relation to factors such as: seasonality, hydraulic load, pollutants load of the VF bed and interactions between these factors...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144311/velocity-based-analysis-of-sediment-incipient-deposition-in-rigid-boundary-open-channels
#3
Hafzullah Aksoy, Mir Jafar Sadegh Safari, Necati Erdem Unal, Mirali Mohammadi
Drainage systems must be designed in a way to minimize undesired problems such as decrease in hydraulic capacity of the channel, blockage and transport of pollutants due to deposition of sediment. Channel design considering self-cleansing criteria are used to solve the sedimentation problem. Incipient deposition is one of the non-deposition self-cleansing design criteria that can be used as a conservative method for channel design. Experimental studies have been carried out in five different cross-section channels, namely trapezoidal, rectangular, circular, U-shape and V-bottom...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144310/preparation-of-ureido-functionalized-pva-silica-mesoporous-fibre-membranes-via-electrospinning-for-adsorption-of-pb-2-and-cu-2-in-wastewater
#4
Meimei Zhou, Weizhen Tang, Pingping Luo, Jiqiang Lyu, Aixia Chen, Longkai Qiao, Daniel Nover
Ureido-functionalized mesoporous polyvinyl alcohol/silica composite nanofibre membranes were prepared by electrospinning technology and their application for removal of Pb(2+) and Cu(2+) from wastewater was discussed. The characteristics of the membranes were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and N2 adsorption-desorption analysis. Results show that the membranes have long fibrous shapes and worm-like mesoporous micromorphologies. Fourier transform infrared spectroscopy confirmed the membranes were successfully functionalized with ureido groups...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144309/combined-electrocoagulation-and-electro-oxidation-of-industrial-textile-wastewater-treatment-in-a-continuous-multi-stage-reactor
#5
Edison GilPavas, Paula Arbeláez-Castaño, José Medina, Diego A Acosta
A combined electrocoagulation (EC) and electrochemical oxidation (EO) industrial textile wastewater treatment potential is evaluated in this work. A fractional factorial design of experiment showed that EC current density, followed by pH, were the most significant factors. Conductivity and number of electrooxidation cells did not affect chemical oxygen demand degradation (DCOD). Aluminum and iron anodes performed similarly as sacrificial anodes. Current density, pH and conductivity were chosen for a Box-Behnken design of experiment to determine optimal conditions to achieve a high DCOD minimizing operating cost (OC)...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144308/numerical-simulation-of-filtration-performance-in-submerged-membrane-bioreactors-effect-of-particle-packed-structure
#6
Zhidong Wang, Kuizu Su, Tong Shu, Weihong Wang
It is widely known that the accumulation of solid matter forming a cake layer on the membrane surface is one of the major limitations of the filtration performance in submerged membrane bioreactors (SMBR). This study is focused on the influence of the cake porosity of different particle microscopic packed structures on the filtration performance of hollow fiber systems. An integrated model based on the finite element method to simulate numerically the flow in an SMBR is presented. The model coupled the Navier-Stokes and Darcy Brinkman equations to simulate a complete filtration run...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144307/reduction-of-chromium-vi-from-aqueous-solution-by-biomass-of-cladosporium-cladosporioides
#7
María Teresa Garza-González, Jonathan Eduardo Ramírez-Vázquez, María de Los Ángeles García-Hernández, María Elena Cantú-Cárdenas, Adriana Liñan-Montes, Juan Francisco Villarreal-Chiu
The capacity of Cladosporium cladosporioides biomass for removal of Cr(VI) in aqueous solutions was evaluated. A 2 × 2 factorial experiment design was used to study the effects of pH and biomass doses. Lower pH values and larger biomass doses increased the capacity of C. cladosporioides biomass for removal of Cr(VI), reaching a reduction capacity of 492.85 mg g(-1), a significantly higher value compared to other biomass reported. Cr(VI) removal kinetic rates followed a pseudo-second order model, like other fungal biomass reported previously...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144306/characterization-of-a-hybrid-polyacrylamide-and-its-flocculation-properties-in-cyanide-tailing-suspensions
#8
Ya Liu, Cuicui Lv, Jian Ding, Peng Qian, Yang Yu, Shufeng Ye, Yunfa Chen
An inorganic-organic hybrid flocculant Al(OH)3-polyacrylamide (Al-PAM) with narrow molecular weight distribution was synthesized using inverse microemulsion polymerization. The hybrid polymer Al-PAM was characterized by Infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy and scanning electron microscopy, and it was found that it had a 'star-like' structure in which Al(OH)3 colloidal particles acted as cores linking PAM chains. The properties of Al-PAM were investigated in flocculating 10 wt% cyanide tailing suspensions...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144305/cost-minimization-in-a-full-scale-conventional-wastewater-treatment-plant-associated-costs-of-biological-energy-consumption-versus-sludge-production
#9
S Sid, A Volant, G Lesage, M Heran
Energy consumption and sludge production minimization represent rising challenges for wastewater treatment plants (WWTPs). The goal of this study is to investigate how energy is consumed throughout the whole plant and how operating conditions affect this energy demand. A WWTP based on the activated sludge process was selected as a case study. Simulations were performed using a pre-compiled model implemented in GPS-X simulation software. Model validation was carried out by comparing experimental and modeling data of the dynamic behavior of the mixed liquor suspended solids (MLSS) concentration and nitrogen compounds concentration, energy consumption for aeration, mixing and sludge treatment and annual sludge production over a three year exercise...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144304/low-energy-consumption-vortex-wave-flow-membrane-bioreactor
#10
Zhiqiang Wang, Weilong Dong, Xiaohong Hu, Tianyu Sun, Tao Wang, Youshan Sun
In order to reduce the energy consumption and membrane fouling of the conventional membrane bioreactor (MBR), a kind of low energy consumption vortex wave flow MBR was exploited based on the combination of biofilm process and membrane filtration process, as well as the vortex wave flow technique. The experimental results showed that the vortex wave flow state in the membrane module could be formed when the Reynolds number (Re) of liquid was adjusted between 450 and 1,050, and the membrane flux declined more slowly in the vortex wave flow state than those in the laminar flow state and turbulent flow state...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144303/zero-valent-aluminum-mediated-degradation-of-bisphenol-a-in-the-presence-of-common-oxidants
#11
I Arslan-Alaton, T Olmez-Hanci, M Dogan, T Ozturk
The use of a commercial, nano-scale zero-valent aluminum (ZVA) powder was explored for the treatment of aqueous Bisphenol A (BPA). The study focused on the (i) activation of hydrogen peroxide (HP) and persulfate (PS) oxidants with ZVA to accelerate BPA degradation, (ii) comparison of the treatment performance in pure and real surface water (SW) samples, (iii) effects on toxicity and (iv) reuse potential of ZVA nanoparticles after ZVA/HP and ZVA/PS treatments. In pure water, ZVA coupled with HP or PS provided an effective means of BPA treatment particularly when PS was employed as the oxidant...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144302/fouling-mitigation-in-anaerobic-membrane-bioreactors-using-fluidized-resin-beads
#12
B Düppenbecker, J Behnisch, M Engelhart, P Cornel
This study focuses on the use of fluidized resin beads to mitigate fouling during ultrafiltration (UF) of the effluent of an anaerobic bioreactor. Two different module configurations were tested: A fluidized bed of resin beads was generated in a tubular UF membrane, and a hollow fiber (HF) UF membrane was submerged into a fluidized bed, respectively. During filtration of anaerobically treated synthetic wastewater using the tubular module, fluidized resin beads with a diameter of 0.5-0.71 mm did not show any beneficial effect...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144301/contamination-levels-and-potential-sources-of-organic-pollution-in-an-asian-river
#13
Chitsan Lin, Kim Anh Nguyen, Chi Thanh Vu, Delia Senoro, Maria Ching Villanueva
The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds (SVOCs) for a period of 16 months (Feb 2014-June 2015). Our analyses show that elevated levels of VOCs were observed near two industrial areas, Dashe and Renwu industrial parks...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144300/enhancing-dewaterability-of-waste-activated-sludge-by-combined-oxidative-conditioning-process-with-zero-valent-iron-and-peroxymonosulfate
#14
Xu Zhou, Wenbiao Jin, Hongyi Chen, Chuan Chen, Songfang Han, Renjie Tu, Wei Wei, Shu-Hong Gao, Guo-Jun Xie, Qilin Wang
The enhancement of sludge dewaterability is of great importance for facilitating the sludge disposal during the operation of wastewater treatment plants. In this study, a novel oxidative conditioning approach was applied to enhance the dewaterability of waste activated sludge by the combination of zero-valent iron (ZVI) and peroxymonosulfate (PMS). It was found that the dewaterability of sludge was significantly improved after the addition of ZVI (0-4 g/g TSS) (TSS: total suspended solids) and PMS (0-1 g/g TSS)...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144299/the-modelling-of-lead-removal-from-water-by-deep-eutectic-solvents-functionalized-cnts-artificial-neural-network-ann-approach
#15
Seef Saadi Fiyadh, Mohammed Abdulhakim AlSaadi, Mohamed Khalid AlOmar, Sabah Saadi Fayaed, Ako R Hama, Sharifah Bee, Ahmed El-Shafie
The main challenge in the lead removal simulation is the behaviour of non-linearity relationships between the process parameters. The conventional modelling technique usually deals with this problem by a linear method. The substitute modelling technique is an artificial neural network (ANN) system, and it is selected to reflect the non-linearity in the interaction among the variables in the function. Herein, synthesized deep eutectic solvents were used as a functionalized agent with carbon nanotubes as adsorbents of Pb(2+)...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144298/flood-forecasting-within-urban-drainage-systems-using-narx-neural-network
#16
Yves Abou Rjeily, Oras Abbas, Marwan Sadek, Isam Shahrour, Fadi Hage Chehade
Urbanization activity and climate change increase the runoff volumes, and consequently the surcharge of the urban drainage systems (UDS). In addition, age and structural failures of these utilities limit their capacities, and thus generate hydraulic operation shortages, leading to flooding events. The large increase in floods within urban areas requires rapid actions from the UDS operators. The proactivity in taking the appropriate actions is a key element in applying efficient management and flood mitigation...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144297/effect-of-reagents-used-during-detection-and-quantification-of-ascaris-suum-in-environmental-samples-on-egg-viability
#17
Isaac Dennis Amoah, Poovendhree Reddy, Thor Axel Stenström
Soil-transmitted helminths (STHs) are a major health concern globally. Infection is mostly through contact with contaminated water, food or soil. Therefore to break the cycle of viable transmission STH eggs must be quantitatively detected in the environment. The effect of different reagents on the viability of Ascaris suum eggs during laboratory detection and quantification was assessed and different incubation solutions compared. Sulphuric acid gave a slightly higher recovery percentage of viable eggs (91...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144296/dynamic-desorption-of-arsenic-from-polymer-supported-hydrated-iron-iii-oxide-in-a-wastewater-treatment-plant
#18
Jian-Long Hu, Xiao-Song Yang, Ting Liu, Li-Nan Shao, Wang Zhang
Polymer-supported hydrated iron(III) oxide (PHIO) was successfully applied as adsorbent for arsenic removal in a wastewater treatment plant in Nandan, China. The practical PHIO adsorbent samples (PHIO-P) were collected from the adsorption column of the wastewater treatment plant, and desorption experiments of the adsorbent were carried out. Our results showed that the formation of precipitates on the surface of PHIO-P might block the porous channel of the adsorbent and decrease its arsenic adsorption capacity...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144295/a-comparative-treatment-of-bleaching-wastewater-by-physicochemical-processes
#19
Ninad Oke, Swati Singh, Anurag Garg
The bleaching effluent discharged from a pulp and paper mill contains chlorinated organic compounds which are toxic to living matter. Physicochemical treatments such as coagulation and different advanced oxidation processes (AOPs) were employed for combined bleaching effluent generated from the first two stages (i.e. chlorination and alkali extraction) (pH = 3.5, chemical oxygen demand (COD) = 1,920 mg/L, and total organic carbon (TOC) = 663 mg/L). At optimum conditions (pH = 7.5, polyaluminium chloride (PAC) dose = 3...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144294/higher-alkyl-sulfatase-activity-required-by-microbial-inhabitants-to-remove-anionic-surfactants-in-the-contaminated-surface-waters
#20
Bulent Icgen, Salih Batuhan Salik, Lale Goksu, Huseyin Ulusoy, Fadime Yilmaz
Biodegradation of anionic surfactants, like sodium dodecyl sulfate (SDS) are challenged by some bacteria through the function of the enzyme alkyl sulfatases. Therefore, identifying and characterizing bacteria capable of degrading SDS with high alkyl sulfatase enzyme activity are pivotal. In this study, bacteria isolated from surfactant contaminated river water were screened for their potential to degrade SDS. Primary screening carried out by the conventional enrichment culture technique and assessment of SDS-degrading ability through methylene blue active substance assay revealed 12, out of 290, SDS-degrading surface water bacteria with maximum SDS degrading abilities of 46-94% in 24-54 h...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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