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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/29757187/sewer-catchment-effects-on-wastewater-and-biosolids-odour-management
#1
Ruth Fisher, Ari Shammay, Juan Pablo Alvarez-Gaitan, Richard M Stuetz
The composition of wastewater in sewer catchments is known to affect the performance of wastewater treatment plants (WWTPs). However, there is limited knowledge as to how catchment characteristics, such as types of catchment industries, impact odour emissions from downstream sludge processing and biosolids management. Odorous emissions from biosolids processing at WWTPs can represent a significant community impact when the local population is exposed to odours. The main odorants emitted from biosolids are volatile sulfur compounds (VSCs), however, volatile organic compounds (VOCs) in emissions may also be perceptable after the removal of VSCs in odour abatement systems...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757186/evaluating-the-excess-sludge-reduction-in-activated-sludge-system-with-ultrasonic-treatment
#2
Shuang Wu, Min Zheng, Qian Dong, Yanchen Liu, Chengwen Wang
Ultrasonic treatment for enhancing biological processes has recently attracted considerable attention in wastewater treatment. In this study, we systematically investigated the mixed liquor properties of activated sludge under ultrasonic treatment. The sludge samples were collected from the aerobic tank of a full-scale membrane bioreactor (MBR) treating municipal wastewater, and the volatile suspended solids (VSS) concentration was approximately 6.0 g/L. The results showed that ultrasonic treatment induced floc disintegration, organics release, temperature increase, microbial activity and pH variation...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757185/adsorbing-low-concentrations-of-cr-vi-onto-ceo-2-zsm-5-and-the-adsorption-kinetics-isotherms-and-thermodynamics
#3
Jianrui Niu, Xiuxiu Jia, Yaqing Zhao, Yanfang Liu, Weizhang Zhong, Zengli Zhai, Zaixing Li
The CeO2 @ZSM-5 was prepared by the dipping method. We used ZSM-5 and CeO2 as the carrier and load components, respectively. The aim was to reduce the low concentration of Cr(VI) in simulated wastewater (the concentration of Cr(VI) ranged from 0.2 to 1 mg/L). The characteristics of ZSM-5 and CeO2 @ZSM-5 samples were determined by X-ray powder diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET)...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757184/the-influence-of-antibiotics-on-wastewater-treatment-processes-and-the-development-of-antibiotic-resistant-bacteria
#4
N Jendrzejewska, E Karwowska
The influence of antibiotics, namely doxycycline, gentamicin, penicillin, nitrofurantoin, and rifampicin, on wastewater treatment was assessed. The presence of 100-300 μg/L of antibiotics (63.52-134.41 mg/g.d.w·d) marginally influenced organic matter degradation, without impacting nitrogen or phosphorus concentrations. However, a significant increase in the number of antibiotic-resistant bacteria was observed, which varied with different antibiotics. The largest number of bacteria became resistant to nitrofurantoin and penicillin...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757183/porous-pvdf-pani-ion-exchange-membrane-iem-modified-by-polyvinylpyrrolidone-pvp-and-lithium-chloride-in-the-application-of-membrane-capacitive-deionisation-mcdi
#5
Yiming Zhang, Wei Zhang, Luis F Cházaro-Ruiz
In this work, polyvinylidene fluoride (PVDF)/polyaniline (PANI) heterogeneous anion-exchange membranes filled with pore-forming agents polyvinylpyrrolidone (PVP) and lithium chloride were prepared by the solution-casting technique using the solvent 1-methyl-2-pyrrolidone (NMP) and a two-step phase inversion procedure. Key properties of the as-prepared membranes, such as hydrophilicity, water content, ion exchange capacity, fixed ion concentration, conductivity and transport number were examined and compared between membranes in different conditions...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757182/nitrate-removal-from-aquaculture-effluents-using-woodchip-bioreactors-improved-by-adding-sulfur-granules-and-crushed-seashells
#6
Mathis von Ahnen, Per Bovbjerg Pedersen, Johanne Dalsgaard
This study examined the effects on nitrate removal when adding sulfur granules and crushed seashells to a woodchip bioreactor treating aquaculture effluents. Using a central composite design, the two components were added at three levels (0.000, 0.125 and 0.250 m3 /m3 bioreactor volume) to 13 laboratory-scale woodchip bioreactors, and a response surface method was applied to find and model the optimal mixture ratios with respect to reactor performance. Adding 0.125 m3 /m3 sulfur granules improved the total N removal rate from 3...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757181/use-of-life-cycle-assessment-to-evaluate-environmental-impacts-associated-with-the-management-of-sludge-and-biogas
#7
Karina Cubas do Amaral, Miguel Mansur Aisse, Gustavo Rafael Collere Possetti, Marcelo Real Prado
Upflow anaerobic sludge blanket (UASB) reactors used in sewage treatment generate two by-products that can be reused: sludge and biogas. At the present time in Brazil, most of this resulting sludge is disposed of in sanitary landfills, while biogas is commonly burned off in low-efficiency flares. The aim of the present study was to use life cycle assessment to evaluate the environmental impacts from four different treatment and final destination scenarios for the main by-products of wastewater treatment plants...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757180/application-of-dielectric-constant-measurement-in-microwave-sludge-disintegration-and-wastewater-purification-processes
#8
Petra Veszelovszki Kovács, Balázs Lemmer, Gábor Keszthelyi-Szabó, Cecilia Hodúr, Sándor Beszédes
It has been numerously verified that microwave radiation could be advantageous as a pre-treatment for enhanced disintegration of sludge. Very few data related to the dielectric parameters of wastewater of different origins are available; therefore, the objective of our work was to measure the dielectric constant of municipal and meat industrial wastewater during a continuous flow operating microwave process. Determination of the dielectric constant and its change during wastewater and sludge processing make it possible to decide on the applicability of dielectric measurements for detecting the organic matter removal efficiency of wastewater purification process or disintegration degree of sludge...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757179/low-dissolved-oxygen-nitrification-in-tropical-sewage-an-investigation-on-potential-performance-and-functional-microbial-community
#9
S W How, S Y Lim, P B Lim, A M Aris, G C Ngoh, T P Curtis, A S M Chua
Intensive aeration for nitrification is a major energy consumer in sewage treatment plants (STPs). Low-dissolved-oxygen (low-DO) nitrification has the potential to lower the aeration demand. However, the applicability of low-DO nitrification in the tropical climate is not well-understood. In this study, the potential of low-DO nitrification in tropical setting was first examined using batch kinetic experiments. Subsequently, the performance of low-DO nitrification was investigated in a laboratory-scale sequential batch reactor (SBR) for 42 days using real tropical sewage...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757178/new-insights-into-the-humic-acid-fouling-mechanism-of-ultrafiltration-membranes-for-different-ca-2-dosage-ranges-results-from-micro-and-macro-level-analyses
#10
Rui Miao, Ying Wu, Pei Wang, Gongzheng Wu, Lei Wang, Xingfei Li, Jiaxuan Wang, Yongtao Lv, Tingting Liu
To reveal the mechanisms of the influence of Ca2+ on membrane fouling with humic acid (HA), the adhesion forces of HA with both other HA molecules and the membrane, the HA fouling layer structure, HA fouling experiments, and the HA rejections at a wide range of Ca2+ dosages were investigated. The results indicated that the effect of Ca2+ on HA fouling can be divided into three stages. At lower ionic strength (IS) of CaCl2 , the change in electrostatic forces is the main factor in controlling HA fouling behavior; i...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757177/formation-of-aerobic-granular-sludge-and-the-influence-of-the-ph-on-sludge-characteristics-in-a-sbr-fed-with-brewery-bottling-plant-wastewater
#11
Hannah Stes, Sven Aerts, Michel Caluwé, Thomas Dobbeleers, Sander Wuyts, Filip Kiekens, Jolien D'aes, Piet De Langhe, Jan Dries
A laboratory-scale sequencing batch reactor (SBR) was operated for 450 days to assess aerobic granule formation when treating brewery/bottling plant wastewater by consistent application of a feast/famine regime. The experiment was divided into three major periods according to the different operational conditions: (I) no pH control and strong fluctuations in organic loading rate (OLR) (1.18 ± 0.25 kgCOD·(m3 ·day)-1 ), (II) pH control and aeration control strategy to reduce OLR fluctuations (1.45 ± 0.65 kgCOD·(m3 ·day)-1 ) and (III) no pH control and stable OLR (1...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757176/benchmarking-of-energy-consumption-in-municipal-wastewater-treatment-plants-a-survey-of-over-200-plants-in-italy
#12
M Vaccari, P Foladori, S Nembrini, F Vitali
One of the largest surveys in Europe about energy consumption in Italian wastewater treatment plants (WWTPs) is presented, based on 241 WWTPs and a total population equivalent (PE) of more than 9,000,000 PE. The study contributes towards standardised resilient data and benchmarking and to identify potentials for energy savings. In the energy benchmark, three indicators were used: specific energy consumption expressed per population equivalents (kWh PE-1 year-1 ), per cubic meter (kWh/m3 ), and per unit of chemical oxygen demand (COD) removed (kWh/kgCOD)...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757175/techno-economic-evaluation-of-simultaneous-production-of-extra-cellular-polymeric-substance-eps-and-lipids-by-cloacibacterium-normanense-nk6-using-crude-glycerol-and-sludge-as-substrate
#13
S K Ram, L R Kumar, R D Tyagi, P Drogui
This study used the technical, economic analysis tool, SuperPro designer in evaluating a novel technology for simultaneous production of extracellular polymeric substance (EPS) and biodiesel using crude glycerol and secondary sludge. As renewable energy sources are depleting, the process utilizes municipal sewage sludge for production of EPS and biodiesel along with crude glycerol, which is a waste byproduct of biodiesel industry providing an alternate way for disposal of municipal sludge and crude glycerol...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757174/magnetic-solid-phase-extraction-for-the-analysis-of-bisphenol-a-naproxen-and-triclosan-in-wastewater-samples
#14
Guo Li, Ruoyu Deng, Guilong Peng, Chun Yang, Qiang He, Ying Lu, Huilan Shi
Magnetic Fe3 O4 graphene oxide nanocomposite was synthesized by chemical coprecipitation method and characterized by scanning electron microscopy, Fourier transform infrared spectra and X-ray diffraction. A simple, rapid, convenient and environmentally friendly method was developed for separation and pre-concentration of trace amounts of bisphenol A, naproxen and triclosan in wastewater samples by high performance liquid chromatography with magnetic Fe3 O4 graphene oxide nanocomposite as the adsorbent for magnetic solid-phase extraction...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757173/the-increase-of-process-stability-in-removing-ammonia-nitrogen-from-wastewater
#15
Andrea Benáková, Iva Johanidesová, Petr Kelbich, Vojtěch Pospíšil, Jiří Wanner
This work focuses on the removal of ammonia nitrogen pollution from wastewaters in a two-stage laboratory model based on a combination of the nitritation and anammox processes with the biomass immobilized in a polyvinyl alcohol (PVA) matrix. Owing to the immobilization approach inside the PVA pellets, the bacterial activity remained nearly unchanged on an abrupt change in the environmental conditions. The nitritation kinetics were significantly dependent on the dissolved oxygen concentration. The critical dissolved oxygen concentration at which the nitritation process using the immobilized bacterial culture stops is 0...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757172/spectrophotometric-determination-of-triclosan-based-on-diazotization-reaction-response-surface-optimization-using-box-behnken-design
#16
Inderpreet Kaur, Sonal Gaba, Sukhraj Kaur, Rajeev Kumar, Jyoti Chawla
A spectrophotometric method based on diazotization of aniline with triclosan has been developed for the determination of triclosan in water samples. The diazotization process involves two steps: (1) reaction of aniline with sodium nitrite in an acidic medium to form diazonium ion and (2) reaction of diazonium ion with triclosan to form a yellowish-orange azo compound in an alkaline medium. The resulting yellowish-orange product has a maximum absorption at 352 nm which allows the determination of triclosan in aqueous solution in the linear concentration range of 0...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757171/the-application-of-an-efficient-modified-decolorizer-in-coagulation-treatment-of-high-color-reclaimed-water
#17
Mengqi Wang, Yimei Tian, Xin Zhao, Xiang Li
High color concentrations in inflows at reclaimed water treatment plants are typically considered as emergency situations, which must be solved using an appropriate decolorizing process. Using the decoloration mechanism of a modified dicyandiamide-formaldehyde polymer (DFP), a urea-formaldehyde polymer and a melamine-formaldehyde polymer (MFP) were prepared with ammonium chloride and ammonium sulfate as the modifiers. An orthogonal experiment indicated that a modified urea-formaldehyde polymer had no effect on decolorization; however, the MFP modified by ammonium chloride in number 16 (MMFP-C16), the DFP modified by ammonium chloride in number 9 (MDFP-C9) and modified by ammonium sulfate in number 6 (MDFP-S6) were successful...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757170/combining-classifiers-to-detect-faults-in-wastewater-networks
#18
Joshua Myrans, Zoran Kapelan, Richard Everson
This work presents a methodology for automatic detection of structural faults in sewers from CCTV footage, which has been improved by combining the outputs of different machine learning techniques. The predictions of support vector machine and random forest classifiers are combined using three distinct techniques: 'both', 'most likely' and 'stacking'. Each technique is tested on CCTV data taken from real surveys covering a range of pipes at locations in the south-west of the UK. The best tested technique, stacking, offers a 5% increase in accuracy for minimal impact in efficiency, proving useful for future development and implementation of the fault detection methodology...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757169/comparison-of-the-degradation-of-molecular-and-ionic-ibuprofen-in-a-uv-h-2-o-2-system
#19
Rongkui Su, Liyuan Chai, Chongjian Tang, Bo Li, Zhihui Yang
The advanced oxidation technologies based on • OH can effectively degrade the pharmaceutical and personal care products under operating conditions of normal temperature and pressure. In this study, direct photolysis of ibuprofen (IBU) is slow due to the relatively low molar extinction coefficient and quantum yield. Compared to direct photolysis, the degradation kinetics of IBU was significantly enhanced in the UV/H2 O2 system, mainly by • OH radical mediated oxidation. In the UV/H2 O2 system, the degradation rate of ionic IBU was slightly faster than that of the molecular form...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29757168/the-rate-of-denitrification-using-hydrodynamically-disintegrated-excess-sludge-as-an-organic-carbon-source
#20
J Walczak, M Zubrowska-Sudol
This study investigates the potential of hydrodynamically disintegrated excess activated sludge when used as a supplementary carbon source for denitrification. Two objectives constituted this study: (i) to analyse the denitrification rate by using excess sludge subjected to hydrodynamic disintegration (HD), performed at different energy densities, as an organic carbon source, and (ii) to analyse the impact of hydrolysis of disintegrated sludge on the denitrification rate. Nitrate reduction tests were conducted to assess the denitrification rate for the following sources of organic carbon: thickened excess sludge disintegrated at three levels of energy density (70, 140 and 210 kJ/L), acetic acid solution and municipal wastewater after mechanical treatment...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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