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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/29944139/the-application-of-ceramsite-ecological-floating-bed-in-aquaculture-its-effects-on-water-quality-phytoplankton-bacteria-and-fish-production
#1
Xiao-Li Li, Thomas Kiran Marella, Ling Tao, Li-Li Dai, Liang Peng, Chao-Feng Song, Gu Li
In recent years, biological floating bed technology has been applied increasingly in aquaculture ponds. In this study we developed a novel floating bed made from ceramsite and studied its effect on water quality, phytoplankton, bacteria and fish growth. Water quality was effectively regulated and controlled in ceramsite floating bed (CFB) ponds with an average transparency of 23.18 cm, ammonia nitrogen (NH4 + -N) of 2.30 mg L-1 , total nitrogen (TN) of 5.09 mg L-1 and total phosphate (TP) of 1.32 mg L-1 which are lower than in control ponds without CFB...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944138/influence-of-combined-sulfachloropyridazine-sodium-and-zinc-on-enzyme-activities-and-biogas-production-during-anaerobic-digestion-of-swine-manure
#2
Ranran Zhang, Jie Gu, Xiaojuan Wang, Li Zhang, Xiaxia Tuo, Aiyun Guo
In order to study the influence of different concentrations of zinc and sulfachloropyridazine sodium (SCPS) on anaerobic digestion (AD) during biogas production, we determined the levels of urease, dehydrogenase activity, and volatile fatty acids (VFAs) in batch tests. The experiments were conducted in small AD devices at a temperature of 37 °C using swine manure and wheat straw as raw materials. Four digestion trials were performed using different zinc and SCPS contents: control digestion with no additives (CK), SCPS at 630 mg kg-1 dry weight (S), SCPS at 630 mg kg-1 with zinc at 500 mg kg-1 dry weight (SL), and SCPS at 630 mg kg-1 with zinc at 5,000 mg kg-1 dry weight (SH)...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944137/advanced-nitrogen-removal-from-municipal-wastewater-treatment-plant-secondary-effluent-using-a-deep-bed-denitrification-filter
#3
Xiaowei Zheng, Shenyao Zhang, Jibiao Zhang, Deying Huang, Zheng Zheng
With the improvement of wastewater discharge standards, wastewater treatment plants (WWTPs) are continually undergoing technological improvements to meet the evolving standards. In this study, a quartz sand deep bed denitrification filter (DBDF) was used to purify WWTP secondary effluent, utilizing high nitrate nitrogen concentrations and a low C/N ratio. Results show that more than 90% of nitrate nitrogen (NO3 -N) and 75% of chemical oxygen demand (COD) could be removed by the 20th day of filtration. When the filter layer depth was set to 1,600 mm and the additional carbon source CH3 OH was maintained at 30 mg L-1 COD (20 mg L-1 methanol), the total nitrogen (TN) and COD concentrations of DBDF effluent were stabilized below 5 and 30 mg L-1 , respectively...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944136/synthesis-of-magnetic-alginate-beads-based-on-magnesium-ferrite-mgfe-2-o-4-nanoparticles-for-removal-of-sr-ii-from-aqueous-solution-kinetic-equilibrium-and-thermodynamic-studies
#4
Sobhy M Yakout, Mohamed R Hassan, Mohamed I Aly
Novel magnetic alginate beads (MagAlgbeads) have been developed by incorporation of magnesium ferrite (MgFe2 O4 ) in alginate beads with the aim of using them in the removal of strontium from aqueous solution. MagAlgbeads were characterized by transmission electron microscopy, scanning electron microscopy, X-ray fluorescence and Fourier transform infrared spectroscopy. The adsorption of strontium onto MagAlgbeads were found to depend on pH and strontium removal increases with increasing pH until pH is 6. Strontium adsorption kinetics run through pseudo-second-order model...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944135/filamentous-bacteria-in-the-nitrifying-activated-sludge
#5
Anna Gnida, Sebastian Żabczyński, Joanna Surmacz-Górska
Filamentous bacteria in addition to wastewater treatment are responsible for the shape of flocs and sedimentation properties of activated sludge. Their dynamics in activated sludge influences the performance of the whole sewage treatment plant. Therefore the composition of activated sludge biocenosis and its dynamics in the nitrification process were investigated. Four laboratory-scale activated sludge membrane bioreactors fed with wastewater highly concentrated with ammonium (synthetic wastewater imitating landfill leachate) were operated to obtain a high rate of nitrification...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944134/kinetic-isotherm-and-thermodynamic-studies-of-the-adsorption-of-dyes-from-aqueous-solution-by-cellulose-based-adsorbents
#6
Yixi Wang, Linyan Zhao, Juan Hou, Huili Peng, Jianning Wu, Zhiyong Liu, Xuhong Guo
In this study, a highly efficient and eco-friendly porous cellulose-based aerogel was synthesized by grafting polyethyleneimine onto quaternized cellulose (PQC) to remove the anionic dye Congo Red (CR). The prepared aerogel had a good flexibility and formability. The adsorbents were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and elemental analysis. The results showed that there were many amino groups on CE/PQC aerogel and the structure was porous, which increased the adsorption capacity...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944133/effect-of-steam-explosion-on-physicochemical-properties-of-waste-activated-sludge-and-the-performance-of-anaerobic-digestion
#7
Yan Zhang, Peng Han, He Liu, Lihui Zhang, Hongbo Liu, Bo Fu
The effect of steam explosion on physicochemical properties of sludge and the performance of anaerobic digestion (AD) was investigated. The steam explosion was conducted under different combinations of temperature and time, ranging 151-198 °C and 4-12 min respectively. The capillary suction time (CST) and viscosity of the sludge was increased with particle size decreased by improved hydrolysis temperature and prolonged hydrolysis time. The best sludge solubilization achieved was 41.3% under pretreatment condition of 198 °C and 4 min...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944132/the-role-of-sodium-carbonate-in-pam-coagulation-flocculation-for-oil-acidized-wastewater-treatment
#8
Jinyi Qin, Hainan Wang, Chuan Qin, Hailong Meng, Wengang Qu, Hui Qian
The pH value of oil acidized wastewater is relatively low (pH = 6.1), which seriously affects the flocculation of polyacrylamide (PAM). NaOH was used to adjust the pH value, but the maximum was only 7.5. The regulation was limited as the Ca2+ in aqueous phase up to 1,350 mg L-1 consumed OH- . A novel formulation of Na2 CO3 + PAM was proposed to form CaCO3 floc core to facilitate PAM coagulation. When the concentration was above 400 mg L-1 , the PAM precipitation tended to be maximum, followed by NaOH adjustment of pH to 8...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944131/effect-of-heating-temperature-and-time-on-the-phosphate-adsorption-capacity-of-thermally-modified-copper-tailings
#9
Runjuan Zhou, Youbao Wang, Ming Zhang, Jing Li, Yanan Gui, Yingying Tang, Beixin Yu, Yaru Yang
In the present study, copper tailings were treated at different temperatures (50-650 °C) and for various times (0.5-6 hours) and their phosphate adsorption capacity was investigated. The results showed that heating temperature significantly affected adsorption capacity. The highest capacity was observed in treatments at 310-350 °C. Heating time did not influence phosphate adsorption ability of copper tailings. Scanning electron microscopy, Barrett-Joyner-Halenda (BJH), and Fourier transform infrared spectroscopy (FTIR) were employed to characterize untreated copper tailings (raw CT) and copper tailings heated at 340 °C (CT340)...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944130/a-comparison-of-removal-performance-of-volatile-organic-and-sulfurous-compounds-between-odour-abatement-systems
#10
A Shammay, I Evanson, R M Stuetz
Three types of odour abatement systems in sewer networks in Australia were studied for 18 months to determine the removals of different compounds. Six volatile sulfurous compounds and seven volatile organic compounds (VOCs) were further investigated. All types of odour abatement systems exhibited good removal of hydrogen sulfide with the biotrickling filters (BTFs) showing the highest consistent removal. Biofilters outperformed BTFs and activated carbon (AC) filters in the removal of dimethyl mono-, di- and tri-sulfide species at the low inlet concentrations typically found...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944129/performance-of-an-indigenous-integrated-slurry-photocatalytic-membrane-reactor-pmr-on-the-removal-of-aqueous-phenanthrene-phe
#11
C Nirmala Rani, S Karthikeyan
In this study, a slurry photocatalytic membrane reactor (PMR) was developed and evaluated for the degradation of aqueous phenanthrene (PHE). During continuous process with a hydraulic retention time (HRT) of 140 min, the maximum PHE degradation and total organic carbon (TOC) removal efficiencies were found to be 97% and 79%, respectively. The reuse and recovery potential of TiO2 was studied with continuous recycling. The major intermediates during photodegradation of PHE were found to be phenanthrenequinone, phenanthenol and fluorine...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944128/further-contributions-to-the-understanding-of-nitrogen-removal-in-waste-stabilization-ponds
#12
R K X Bastos, E N Rios, I A Sánchez
A set of experiments were conducted in Brazil in a pilot-scale waste stabilization pond (WSP) system (a four-maturation-pond series) treating an upflow anaerobic sludge blanket (UASB) reactor effluent. Over a year and a half the pond series was monitored under two flow rate conditions, hence also different hydraulic retention times and surface loading rates. On-site and laboratory trials were carried out to assess: (i) ammonia losses by volatilization using acrylic capture chambers placed at the surface of the ponds; (ii) organic nitrogen sedimentation rates using metal buckets placed at the bottom of the ponds for collecting settled particulate matter; (iii) nitrogen removal by algal uptake based on the nitrogen content of the suspended particulate matter in samples from the ponds' water column...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944127/brewery-wastewater-treatment-using-mbr-coupled-with-nanofiltration-or-electrodialysis-biomass-acclimation-and-treatment-efficiency
#13
B Sawadogo, Y Konaté, G Lesage, F Zaviska, M Monnot, M Heran, H Karambiri
Breweries release significant amounts of wastewater loaded with various organic and mineral materials. Prior studies of membrane bioreactor (MBR) wastewater treatment have been conducted with very little interest granted to the conditions of biomass acclimation. This study displays biomass behavior during brewery wastewater treatment by an aerobic MBR. In addition, nanofiltration and electrodialysis have been studied as potential post-treatment to decrease mineral concentrations and permit further water reuse for agriculture...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944126/modelling-the-bioenergy-potential-of-municipal-wastewater-treatment-plants
#14
Kerstin Schopf, Johannes Judex, Bernhard Schmid, Thomas Kienberger
A municipal wastewater treatment plant accounts for a large portion of the total energy consumption of a municipality. Besides their high energy demand, the plants also display a significant bioenergy potential. This is due to the utilisation of the energy content of digester gas and sewage sludge if there exist suitable units. To maximise the energy recovery efficiency of wastewater treatment systems (WWTS), it is important to analyse the amount of digester gas and sludge produced in different types of plants...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944125/adsorption-of-reactive-dyes-onto-chitosan-montmorillonite-intercalated-composite-multi-response-optimization-kinetic-isotherm-and-thermodynamic-study
#15
J Li, J Cai, L Zhong, H Wang, H Cheng, Q Ma
Chitosan/montmorillonite intercalated composite (CTS/MMT) was used as an effective adsorbent for removal of reactive dyes, i.e. Reactive Black 5 (RB5), Reactive Red 136 (RR136), Reactive Yellow 145 (RY145) and Reactive Blue 222 (RB222). Taguchi method attached grey relational analysis was applied to determine the optimal adsorption conditions, including pH, initial concentration of dye, temperature, adsorbent dosage and contact time, for achieving simultaneous maximization of removal percentage and adsorption capacity...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944124/effect-of-low-concentrations-of-dissolved-oxygen-on-the-activity-of-denitrifying-methanotrophic-bacteria
#16
Christel Kampman, Laura Piai, Hardy Temmink, Tim L G Hendrickx, Grietje Zeeman, Cees J N Buisman
Chemical energy can be recovered from municipal wastewater as biogas through anaerobic treatment. Effluent from direct anaerobic wastewater treatment at low temperatures, however, still contains ammonium and considerable amounts of dissolved methane. After nitritation, methane can be used as electron donor for denitrification by the anaerobic bacterium 'Candidatus Methylomirabilis oxyfera'. It was shown that in the presence of 0.7% O2, denitrifying methanotrophic activity slightly increased and returned to its original level after oxygen had been removed...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944123/evaluating-catchment-response-to-artificial-rainfall-from-four-weather-generators-for-present-and-future-climate
#17
Hjalte Jomo Danielsen Sørup, Steffen Davidsen, Roland Löwe, Søren Liedtke Thorndahl, Morten Borup, Karsten Arnbjerg-Nielsen
The technical lifetime of urban water infrastructure has a duration where climate change has to be considered when alterations to the system are planned. Also, models for urban water management are reaching a very high complexity level with, for example, decentralized stormwater control measures being included. These systems have to be evaluated under as close-to-real conditions as possible. Long term statistics (LTS) modelling with observational data is the most close-to-real solution for present climate conditions, but for future climate conditions artificial rainfall time series from weather generators (WGs) have to be used...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944122/microalgae-population-dynamics-growth-with-anmbr-effluent-effect-of-light-and-phosphorus-concentration
#18
P Sanchis-Perucho, F Duran, R Barat, M Pachés, D Aguado
The aim of this study was to evaluate the effect of light intensity and phosphorus concentration on biomass growth and nutrient removal in a microalgae culture and their effect on their competition. The photobioreactor was continuously fed with the effluent from an anaerobic membrane bioreactor pilot plant treating real wastewater. Four experimental periods were carried out at different light intensities (36 and 52 μmol s-1 m-2 ) and phosphorus concentrations (around 6 and 15 mgP L-1 ). Four green algae - Scenedesmus, Chlorella, Monoraphidium and Chlamydomonas- and cyanobacterium were detected and quantified along whole experimental period...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944121/optimization-of-process-conditions-for-preparation-of-activated-carbon-from-waste-salix-psammophila-and-its-adsorption-behavior-on-fluoroquinolone-antibiotics
#19
Xiao Liu, Yibei Wan, Penglei Liu, Lei Zhao, Weihua Zou
Salix psammophila (SP), a solid waste abundantly available, was applied as a precursor to prepare the activated carbon by chemical activation method using phosphoric acid (H3 PO4 ). Response surface methodology based on Box-Behnken design was used to optimize the prepared conditions of activated carbon. The effects of concentration of H3 PO4 , activation temperature and activation time on the adsorption performance (expressed by the adsorption capacity of ciprofloxacin hydrochloride (CIP) and norfloxacin (NOR)) were investigated...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29944120/inhibitory-effects-of-extracts-from-cinnamomum-camphora-fallen-leaves-on-algae
#20
Zumulati Yakefu, Wulan Huannixi, Chaolin Ye, Tiefeng Zheng, Silan Chen, Xin Peng, Zhengfeng Tian, Junhao Wang, Youyou Yang, Zhongqing Ma, Zhaojiang Zuo
Natural allelochemicals are considered as a source of algaecides. To uncover the anti-algal activity of Cinnamomum camphora fallen leaves and promote their usage as algaecides, the composition of their water and methanol extracts was analyzed, and the inhibitory effects of extracts on the growth of Microcystis aeruginosa and Chlamydomonas reinhardtii, and chlorophyll (Chl) content and photosynthetic abilities in C. reinhardtii were investigated. Twenty-five compounds were detected in the water extracts, mainly including terpenoids, esters, alcohols, and ketones...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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