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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/29339627/corrigendum-water-science-and-technology-76-2-323-336-detoxification-of-photo-catalytically-treated-2-chlorophenol-optimization-through-response-surface-methodology-doi-10-2166-wst-2017-152
#1
Muhammad Z Ahmad, S Ehtisham-Ul-Haque, Numrah Nisar, Khizar Qureshi, Abdul Ghaffar, Mazhar Abbas, Jan Nisar, Munawar Iqbal
No abstract text is available yet for this article.
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339626/estimation-of-the-dilution-field-near-a-marine-outfall-by-using-effluent-turbidity-as-an-environmental-tracer-and-comparison-with-dye-tracer-data
#2
José Otavio Goulart Pecly
The alternative use of effluent turbidity to determine the dilution field of a domestic marine outfall located off the city of Rio de Janeiro was evaluated through field work comprising fluorescent dye tracer injection and tracking with simultaneous monitoring of sea water turbidity. A preliminary laboratory assessment was carried out with a sample of the outfall effluent whose turbidity was measured by the nephelometric method before and during a serial dilution process. During the field campaign, the dye tracer was monitored with field fluorometers and the turbidity was observed with an optical backscattering sensor interfaced to an OEM data acquisition system...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339625/acid-production-potentials-of-massive-sulfide-minerals-and-lead-zinc-mine-tailings-a-medium-term-study
#3
Emin Ender Çelebi, Mehmet Salim Öncel, Mehmet Kobya
Weathering of sulfide minerals is a principal source of acid generation. To determine acid-forming potentials of sulfide-bearing materials, two basic approaches named static and kinetic tests are available. Static tests are short-term, and easily undertaken within a few days and in a laboratory. In contrast, kinetic tests are long-term procedures and mostly carried out on site. In this study, experiments were conducted over a medium-term period of 2 months, not as short as static tests and also not as long as kinetic tests...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339624/the-combined-effects-of-carbon-nitrogen-ratio-suspended-biomass-hydraulic-retention-time-and-dissolved-oxygen-on-nutrient-removal-in-a-laboratory-scale-anaerobic-anoxic-oxic-activated-sludge-biofilm-reactor
#4
D S Manu, Arun Kumar Thalla
The current trend in sustainable development deals mainly with environmental management. There is a need for economically affordable, advanced treatment methods for the proper treatment and management of domestic wastewater containing excess nutrients (such as nitrogen and phosphorus) which can cause eutrophication. The reduction of the excess nutrient content of wastewater by appropriate technology is of much concern to the environmentalist. In the current study, a novel integrated anaerobic-anoxic-oxic activated sludge biofilm (A2O-AS-biofilm) reactor was designed and operated to improve the biological nutrient removal by varying reactor operating conditions such as carbon to nitrogen (C/N) ratio, suspended biomass, hydraulic retention time (HRT) and dissolved oxygen (DO)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339623/effects-of-scale-and-froude-number-on-the-hydraulics-of-waste-stabilization-ponds
#5
Isabela De Luna Vieira, Jhonatan Barbosa Da Silva, Carlos Nobuyoshi Ide, Johannes Gérson Janzen
This paper presents the findings from a series of computational fluid dynamics simulations to estimate the effect of scale and Froude number on hydraulic performance and effluent pollutant fraction of scaled waste stabilization ponds designed using Froude similarity. Prior to its application, the model was verified by comparing the computational and experimental results of a model scaled pond, showing good agreement and confirming that the model accurately reproduces the hydrodynamics and tracer transport processes...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339622/identification-of-fouling-mechanisms-in-mbrs-at-constant-flowrate-model-applications-and-sem-edx-characterizations
#6
Bo Hu, Xingtao Zuo, Juan Xiong, Huimeng Yang, Menghua Cao, Shuili Yu
A fundamental understanding of fouling mechanisms is critical to improving filtration operations. The performance of four parallel membrane bioreactors (MBRs) with different sludge retention times (SRTs) was monitored during long-term constant flowrate filtration. The characteristics of the membrane and transmembrane pressure (TMP) profiles obtained were studied to demonstrate fouling mechanisms. Both classical blocking models and their combined models were evaluated. The intermediate model provided very good agreement with all the TMP data...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339621/highly-enhanced-adsorption-of-congo-red-by-functionalized-finger-citron-leaf-based-porous-carbon
#7
Gui-Hua Zhao, Yao-Yao Fang, Wei Dai, Na Ma
A novel high-performance porous carbon material, lanthanum(III)-doped finger-citron-leaf-based porous carbon (La/FPC), has been synthesized and used as an adsorbent for anion dye Congo red (CR). The La/FPC was characterized by nitrogen adsorption and desorption isotherms, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The adsorption performance of CR by the FPC and La/FPC composites with different contents of lanthanum(III) were evaluated in fixed-bed breakthrough experiments and batch tests at room temperature (298 K)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339620/the-membrane-fouling-mechanisms-of-the-pac-bpac-uf-combined-process-used-to-treat-the-secondary-effluent-from-municipal-wastewater-treatment-plant
#8
Lihua Sun, Ning He, Xi Duan, Bingbing Yang, Cuimin Feng, Yajun Zhang
The combined processes of powdered activated carbon/biological powdered activated carbon- ultrafiltration (PAC/BPAC-UF) were used to treat secondary effluent. In this study, the effect of PAC and BPAC on membrane flux, membrane resistance and the removal of different molecular weight organic compounds were investigated. In addition, the structure characteristics of the microorganisms of the BPAC were analyzed. The results showed that the optimum dosage of PAC and BPAC was 10 mg/L and 40 mg/L respectively. The reversible membrane fouling resistance of BPAC-UF was higher than that of PAC-UF, and the two processes had the least irreversible resistance at the best dosage...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339619/improved-sludge-dewaterability-and-hydrolysis-performance-after-pretreatment-with-fenton-s-reagent
#9
Hongying Yuan, Yuping Yang, Jian Yuan, Yanning Wang, Yameng Song, Jingfang Lu, Jianyang Song
The dewaterability of excess sludge significantly improved upon pretreatment with Fenton's reagent in this study. After 0.9 g/L of Fe2+ and 5.0 g/L of H2O2 were added to the sludge, and reacted for 2 h at pH = 4, the specific resistance to filtration (SRF) of the excess sludge decreased from an initial value of 29.74 × 1012 m/kg to 6.49 × 1012 m/kg. The factors that affected this improvement in sludge dewaterability as evaluated by SRF reduction showed the following order: H2O2 > pH > Fe2+ > reaction time...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339618/rheological-and-electrical-properties-used-to-investigate-the-coagulation-process-during-sludge-treatment
#10
A Mortadi, A El Melouky, E Chahid, H Nasrellah, M Bakasse, A Zradba, O Cherkaoui, R El Moznine
Analyses of rheological properties and electrical conductivity (σdc) at direct current have been employed in order to investigate the effects of calcium oxide on the coagulation process during sludge treatment in the textile industry. In this context, rheological and electrical measurements were performed on five samples - one that contained raw sludge and the other four that were prepared from the raw sludge and different amounts of calcium oxide: 2, 3, 4, 5% (w/w). Rheological behavior of these samples was analyzed using the Herschel-Bulkley modified model...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339617/characteristics-of-n2o-production-and-hydroxylamine-variation-in-short-cut-nitrification-sbr-process
#11
Bo Hu, Junhong Ye, Jianqiang Zhao, Xiaoqian Ding, Liwei Yang, Xiaolei Tian
In order to study the characteristics of nitrous oxide (N2O) production and hydroxylamine (NH2OH) variation under oxic conditions, concentrations of NH2OH and N2O were simultaneously monitored in a short-cut nitrification sequencing batch reactor (SBR) operated with different influent ammonia concentrations. In the short-cut nitrification process, N2O production was increased with the increasing of ammonia concentration in influent. The maximum concentrations of dissolved N2O-N in the reactor were 0.11 mg/L and 0...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339616/cod-removal-from-leachate-by-electrocoagulation-process-treatment-with-monopolar-electrodes-in-parallel-connection
#12
Mehtap Tanyol, Aysenur Ogedey, Ensar Oguz
This study examines the removal of chemical oxygen demand (COD) from landfill leachate generated from the municipal landfill site of Bingol, Turkey. The effect of parameters such as current density, pH, and inter-electrode distance during the electrocoagulation (EC) process on COD removal of the process was investigated. Moreover, for COD removal, the energy consumption and operating costs were calculated for iron electrode under the EC conditions. COD removal efficiency was 72.13% at the current density of 16 mA m-2, pH of 8...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339615/adsorption-performance-of-polydopamine-modified-attapulgite-granular-adsorbent-for-methylene-blue
#13
Weisheng Zheng, Hailing Wang, Zhaolian Zhu, Peng Wei
Polydopamine-modified granule organo-attapulgite adsorbent (PDA-GOAT) was facilely prepared via a dip-coating approach. The samples were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Surface area and pore size were calculated from the Brunauer-Emmett-Teller method by N2 adsorption-desorption isotherm. The adsorption behaviour of methylene blue (MB) onto PDA-GOAT was systematically investigated. The experimental data revealed that the adsorption process fitted well with the pseudo-second-order kinetics equation and the adsorption isotherm fitted better with the Langmuir model...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339614/application-of-image-processing-on-struvite-recovery-from-swine-wastewater-by-using-the-fluidized-bed
#14
Zhi-Long Ye, Yujun Deng, Xin Ye, Yaoyin Lou, Shaohua Chen
Fluidized granulation is one of the common methods used in wastewater treatment and resource recovery with harvesting millimeter-scale large particles. Presently, effective methods are lacking to measure the fluidized granules ranging from micro- to millimeter scales, with the consequence of ineffectively controlling and optimizing the granulation process. In this work, recovering struvite (MgNH4PO4·6H2O) from swine wastewater by using a fluidized bed was taken as an example. Image processing was applied to analyze the properties of different types of struvite granules, including morphology, particle size distribution, number density and mass concentration...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339613/sorption-of-cr-pb-cu-zn-cd-ni-and-co-to-nano-tio2-in-seawater
#15
Graca Bożena, Danuta Zakrzewska, Beata Szymczycha
In this study, the role of nanoparticles in complex aqueous matrices such as the Baltic Sea was investigated in batch-mode experiments in which titanium dioxide nanoparticles (nano-TiO2) were tested for their ability to remove heavy metals (Cr, Pb, Cu, Zn, Cd, Ni, Co) from multicomponent spiked and non-spiked Baltic Sea water. The experimental data were analyzed using different isotherms (Langmuir, Freundlich, Dubinin-Kaganer-Radushkevich (DKR)) and models (pseudo-first-order and pseudo-second-order models, the double-exponential model, and the Weber-Morris model)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339612/industrial-wastewater-treatment-with-a-bioelectrochemical-process-assessment-of-depuration-efficiency-and-energy-production
#16
Daniele Molognoni, Stefania Chiarolla, Daniele Cecconet, Arianna Callegari, Andrea G Capodaglio
Development of renewable energy sources, efficient industrial processes, energy/chemicals recovery from wastes are research issues that are quite contemporary. Bioelectrochemical processes represent an eco-innovative technology for energy and resources recovery from both domestic and industrial wastewaters. The current study was conducted to: (i) assess bioelectrochemical treatability of industrial (dairy) wastewater by microbial fuel cells (MFCs); (ii) determine the effects of the applied organic loading rate (OLR) on MFC performance; (iii) identify factors responsible for reactor energy recovery losses (i...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339611/mechanism-of-1-4-dioxane-microbial-degradation-revealed-by-16s-rrna-and-metatranscriptomic-analyses
#17
Xiangyu Guan, Fei Liu, Jing Wang, Caoxiang Li, Xiaoxuan Zheng
1,4-Dioxane (dioxane), a probable human carcinogen, often exists in industrial wastewater and domestic sewage. In this study, we applied 16S rRNA and metatranscriptomic methods to analyze the dioxane biodegradation mechanism by activated sludge. Tetrahydrofuran (THF) was added as an essential co-metabolite to promote the degradation of dioxane. We found the dioxane removal ratio increased with increasing THF concentrations. When the THF concentration increased from 60.0 to 200.0 mg/L, the dioxane degradation rate was stable...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339610/effect-of-precursor-type-on-the-reduction-of-concentrated-nitrate-using-zero-valent-copper-and-sodium-borohydride
#18
Tihitinna Asmellash Belay, C Y Lin, H M Hsiao, M F Chang, J C Liu
In this study, we demonstrated that the choice of precursor has a strong effect on the reduction of nitrate (NO3-) using zero-valent copper (Cu0) synthesized by sodium borohydride (NaBH4). Different precursors: CuSO4, CuO, Cu2O, Cu powder, and Cu mesh were used to reduce NO3- at 677 mg-N/L under the reducing conditions of NaBH4. Compared with the prehydrolyzed samples, those prepared without prehydrolysis exhibited lower reduction rates, longer times and higher concentrations of nitrite (NO2-) intermediate...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339609/effects-of-ph-and-coexisting-chemicals-on-photolysis-of-perfluorooctane-sulfonate-using-an-excited-xenon-dimer-lamp
#19
Naoyuki Kishimoto, Koji Doda
Vacuum ultraviolet (VUV) photolysis at the wavelength of 172 nm in a sulfate solution was introduced as a more efficient process for perfluorooctane sulfonate (PFOS) degradation than ultraviolet (UV) photolysis at 254 nm. The effects of pH and coexisting chemicals on VUV photolysis under the coexistence of 100 mM sulfate were investigated. VUV irradiation successfully degraded PFOS, and the degradation rate was 5.5 times higher than by UV photolysis. Direct VUV photolysis was inferred to mainly contribute to PFOS degradation...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29339608/pilot-study-of-oilfield-wastewater-treatment-by-micro-flocculation-filtration-process
#20
Shaoxiong Si, Zhong Yan, Zhaobo Gong, Pengfei Liu, Yumin Zhang, Yu Xiang
In order to meet the latest Environmental Protection Law of China on wastewater discharge standards, this paper studied a pilot-scale micro-flocculation filtration pretreatment process for the treatment of oilfield wastewater. The experiment showed that the removal rate of oil and suspended solids (SS) respectively increased from 91.52% to 95.38% and from 66.42% to 97.19%. After the treatment by the micro-flocculation filtration device, the relevant characteristics of the discharge wastewater satisfied the latest standards continuously...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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