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Water Environment Research: a Research Publication of the Water Environment Federation

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https://www.readbyqxmd.com/read/28105984/preparation-of-efficient-biobr-mil-88b-fe-composites-with-enhanced-photocatalytic-activities
#1
Xinxin Yue
In this study, a novel composite containing an iron based metal-organic framework (MOF) and BiOBr was successfully synthesized by a simple method, and was fully characterized by X-ray diffraction patterns, Fourier transform infrared spectra, UV/vis diffuse reflectance spectra and transmission electron microscopy. Moreover, the photocatalytic activities of BiOBr/MIL-88B(Fe) composites and the pure materials were evaluated by measuring the degradation of Rhodamine B under visible light. The results show that the composite exhibits better photocatalytic activities than pure materials, which can be ascribed to the high adsorption capacity of MIL-88B(Fe) and the enhanced separation of photogenerated charge carriers from assembly of MIL-88B(Fe) on BiOBr...
January 17, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28087921/pathogen-characterization-of-fresh-and-stored-mesophilic-anaerobically-digested-biosolids
#2
Cecily A
Culturable bacterial pathogens (Campylobacter, Salmonella, Listeria, Yersinia) and indicators (E. coli, enterococci, Clostridium perfringens) were quantified at six wastewater treatment plants that land apply anaerobically digested biosolids in Ontario, Canada. Cryptosporidium parvum and Giardia lamblia were also quantified by PCR. Salmonella and Listeria were frequently detected in sludge and liquid biosolids (70-100% of samples) but less often in fresh dewatered cake biosolids (50-60%); with low levels in fresh cake (<100 cells/g dw)...
January 13, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28074743/synthesis-of-nanoporous-carbon-for-fast-uptake-of-cr-vi-and-ni-ii-from-aqueous-solution
#3
Imed Ghiloufi
Nanoporous carbon (NPC), based on organic xerogel compounds, was prepared at 650 ºC pyrolysis temperature by sol-gel method from pyrogallol and formaldehyde (PF-650) mixtures in water using picric acid as catalyst. The performance of NPC was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and nitrogen porosimetry. The metal uptake characteristics were explored using effective parameters including pH, contact time, initial metal ion concentration, and temperature...
January 10, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28074752/removal-of-17%C3%AE-estradiol-in-a-biological-active-carbon-reactor-with-acetic-acid-and-humic-acid
#4
Zhongtian Li
The objective of this study is to characterize the removal of 17β-estradiol (E2) and the microbial community of a biologically active carbon (BAC) reactor under acetic acid or humic acid as the primary carbon source. Influent E2 concentration was maintained at 20 μg/L. Higher than 99 % removal of E2 was achieved by the BAC reactor. E2 concentration increased from below detection limit (<5.8 ng/L) to 48±8 ng/L after switching the primary carbon source from acetic acid to humic acid in the reactor influent...
January 6, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28074753/conversion-of-wastes-to-bioelectricity-bioethanol-and-fertilizer
#5
Abdul Majeed
This research article presents production of bioelectricity, bioethanol and fertilizer from different industrial wastewaters supplemented with waste fruit and vegetables. Bioelectricity was generated from wastewater through the development of different microbial fuel cells (MFCs). It was observed that the voltage was increased in series combination whereas current was increased in parallel combinations. The series combination of four units of single chamber and eight units of double chamber MFCs produced the power output of 5...
January 4, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28079017/phenol-contaminated-water-treatment-on-several-modified-dimensionally-stable-anodes
#6
Pavithra Bhakthi
Phenolic compounds are some of the most common hazardous organics in wastewater. Removal of these pollutants is important. Physiochemical method such as electrochemical oxidation on dimensionally stable anodes is more convenient in removing such organic pollutants. Therefore, this study focuses on development of three different anodes for phenol contaminated water treatment. The performances of steel/IrO2, steel/IrO2-Sb2O3 and Ti/IrO2-Sb2O3 anodes were tested and compared. Nearly 50%, 76% and 84% of Chemical Oxygen Demand removal efficiencies were observed for steel/IrO2, steel/IrO2-Sb2O3 and Ti/IrO2-Sb2O3 anodes, respectively...
December 23, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28079018/methyl-red-decolorization-efficiency-of-a-korea-strain-of-aspergillus-sp-immobilized-into-different-polymeric-matrices
#7
Beom-Su Kim
Intensive research studies have revealed that fungal decolorization of dye wastewater is a promising replacement for the current process of dye wastewater decolorization. We isolated an Aspergillus sp. from the effluent of a textile industry area in Korea and assessed the effects of a variety of operational parameters on the decolorization of methyl red (MR) by this strain of Aspergillus sp. This Aspergillus sp. was then immobilized by entrapment in several polymeric matrices and the effects of operational conditions on MR decolorization were investigated again...
December 22, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28087920/spatial-and-temporal-variation-of-water-quality-in-the-bertam-catchment-cameron-highlands-malaysia
#8
G Rasul
The spatio-temporal variability of water quality associated with anthropogenic activities was studied for the Bertam River and its main tributaries within the Bertam Catchment, Cameron Highlands, Malaysia. A number of physico-chemical parameters of collected samples were analyzed to evaluate their spatio-temporal variability. Non-parametric statistical analysis showed significant temporal and spatial differences (p<0.05) in most of the parameters across the Catchment. Parameters except DO and COD displayed higher values in rainy season...
December 16, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28087923/enhanced-aerobic-sludge-granulation-by-seeding-concentrated-activated-sludge-with-ca-alginate-gel
#9
Can Sun
The present study focuses on the effect of Ca-alginate gel on aerobic sludge granulation. Three sequencing batch reactors (SBRs) seeded with different mixtures of Ca-alginate gel and activated sludge with the fraction (weight/weight of dry biomass) of 0%, 5.5% and 15.5% respectively. The granulation time of 14 days was obtained with 5.5% additive, whilst 32 days were needed to adapt aerobic granules developed with 0% Ca-alginate gel. Full granulation was achieved in the trial with 15.5% additive from the 20th day...
December 9, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061942/a-study-on-hydrodynamic-behavior-of-fine-sediment-in-retention-structure-using-particle-image-velocimetry
#10
Masoumeh MoayeriKashani, Lai Sai Hin, Shaliza Ibrahim, Nik Meriam Nik Sulaiman
  Detention ponds are one type of stormwater best management practices (BMPs) that can be used for the quantity control of stormwater. The pond works by reducing peak discharge downstream through temporary storage and gradual release. In this paper, a new experimental procedure using particle image velocimetry (PIV) is introduced for a two-dimensional study of the hydrodynamic behavior of fine particles in a specially designed sediment basin. The hydrodynamic behavior of fine particles under different hydraulics parameters was achieved by shifting outlet placement, using different particle-size diameters, varying the distance of the inlet from the water surface, and varying the flow rate...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061941/removal-of-organophosphorus-pesticides-from-aqueous-solution-by-magnetic-fe3o4-red-mud-nanoparticles
#11
Senar Aydin
  The aim of this study was to investigate the usability of magnetic Fe3O4/red mud nanoparticles (NPs) for the removal of organophosphorus pesticides from water samples. The effect of various experimental parameters such as red mud amount in Fe3O4/red mud-NPs, pH, contact time, initial pesticide concentrations and adsorbent dose was studied in order to find the optimum conditions for their removal in a batch process. The Fe3O4/red mud-NPs were characterized by using TGA, SEM, XRD, VSM, and determination of the BET surface area...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061940/startup-of-the-anammox-process-in-a-membrane-bioreactor-anmbr-from-conventional-activated-sludge
#12
P Gutwiński, G Cema, A Ziembińska-Buczyńska, J Surmacz-Górska, M Osadnik
  In this study, a laboratory-scale anammox process in a membrane bioreactor (AnMBR) was used to startup the anaerobic ammonium oxidation (anammox) process from conventional activated sludge. Stable operation was achieved after 125 days. From that time, nitrogen load was gradually increased. After six months, the average nitrogen removal efficiency exceeded 80%. The highest obtained special anammox activity (SAA) achieved was 0.17 g (<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="02268-ilm01...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061939/development-of-a-simplified-model-for-completely-mixed-biofilm-reactor
#13
Sushovan Sarkar, Debabrata Mazumder
  A simplified model for the completely mixed biofilm process formulated correlations between entering and exiting substrate concentrations, average substrate flux in the biofilm and effective biofilm thickness. The model essentially considered the substrate mass transport into the biofilm as per Fick's second law and steady state substrate as well as biomass balance for biofilm. The numerical solution of the biofilm model involved evaluation of the average flux along with exiting substrate concentration and application of the Runge-Kutta method for determining the effective biofilm thickness...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061938/influence-of-different-electron-acceptors-on-the-anaerobic-degradation-of-curly-leaf-pondweed
#14
Shu-Chuan Peng, Xu Xu, Ding Ma, Tian-Hu Chen, Jin Wang
  Curly-leaf pondweed (Potamogeton crispus) was utilized as the representative to investigate the biodecomposition process of aquatic plants under different reducible conditions. Results showed that the methane production was inhibited when different electron acceptors (Fe(III), <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="02257-ilm01.gif"/> and <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="02257-ilm09.gif"/>) were available. The methane production was decreased by 57% when Fe(III) and <inline-graphic xmlns:xlink="http://www...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061937/thermal-behavior-of-cd-during-sludge-incineration-experiments-and-thermodynamic-equilibrium-model
#15
Jingyong Liu, Zhongxu Zhuo, Shuiyu Sun, Wuming Xie, Shaoyou Lu, Jian Sun, Jiahong Kuo, Wang Yujie
  Experiments and thermodynamic equilibrium calculations were performed to investigate the behavior of Cd during sewage sludge incineration. The chemical equilibrium calculations indicated that chlorine significantly increased the volatilization of Cd in the form of CdCl2. In addition, SiO2-containing materials can function as sorbents for stabilizing Cd. The effect of PVC added to the sludge on the migration of Cd in the sludge was greater than that of NaCl. As the temperature increased, both organic and inorganic chlorides reduced the Cd distribution in the bottom ash...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061936/a-novel-model-for-the-entire-settling-thickening-process-in-a-secondary-settling-tank
#16
Zhijiang He, Yuankai Zhang, Hongchen Wang, Lu Qi, Xunfei Yin, Xiaojun Zhang, Yang Wen
  Sludge settling and thickening occur simultaneously in secondary settling tanks (SSTs). The ability to accurately calculate the settling and thickening capacity of activated sludge was of great importance. Despite extensive studies on the development of settling velocity models for use with SSTs, these models have not been applied due to the difficulty in calibrating the related parameters. Additionally, there have been some studies of the thickening behavior of the activated sludge in SSTs. In this study, a novel settling and thickening model for activated sludge was developed, and the model was validated using experimental data (R2 = 0...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061935/adsorption-of-vanadium-v-from-scr-catalyst-leaching-solution-and-application-in-methyl-orange
#17
Xuelong Sha, Wei Ma, Fanqing Meng, Ren Wang, Tian Fuping, Linsen Wei
  In this study, we explored an effective and low-cost catalyst and its adsorption capacity and catalytic capacity for Methyl Orange Fenton oxidation degradation were investigated. The catalyst was directly prepared by reuse of magnetic iron oxide (Fe3O4) after saturated adsorption of vanadium (V) from waste SCR (Selective Catalytic Reduction) catalyst. The obtained catalyst was characterized by FTIR, XPS and the results showed that vanadium (V) adsorption process of Fe3O4 nanoparticles was non-redox reaction...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061934/dynamic-modeling-of-hydrogen-sulfide-within-enclosed-environments-in-biosolids-recovery-facilities
#18
Rita Ventura Matos, Natércia Matias, Filipa Ferreira, José Saldanha Matos
  Hydrogen sulfide emissions from wastewater affect human health and equipment durability, thus presenting a complex issue for utilities. Several VOC emission models have been used before to predict H2S in collection systems and water resources recovery operations, even if with restrictions. By contrast, fewer studies focus on biosolids emissions and modelling. This paper presents a dynamic modelling approach to predict H2S concentration in a tank headspace of a wastewater biosolids recovery facility. Data from one of the largest Portuguese water resources recovery facilities was collected under different facility operating modes...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061933/a-new-approach-to-modeling-operational-conditions-for-mitigating-fouling-in-membrane-bioreactor
#19
Mehdi Pourabdollah, Ayoob Torkian, Majid Hosseinzadeh
  Modeling and optimization tools play a key role in membrane fouling control in membrane bioreactor (MBR) systems by delineating the more important variables involved. In this study, the influence of sludge retention time (SRT), aeration rate and filtration mode on hollow fiber membrane fouling was investigated. Using the response surface methodology (RSM) for modeling and central composite rotatable design (CCRD) for design of experiments, mathematical models were developed for fouling rate and protein (P1, P2) and carbohydrate (C1, C2) concentrations in two layers of fouling...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28061932/biodegradation-of-2-4-dichlorophenol-in-packed-bed-biofilm-reactor-effect-of-hydraulic-retention-time-biogenic-substrate-and-loading-rate
#20
Bhishma P Patel, Arvind Kumar
  The removal of 2,4-dichlorophenol (2,4-DCP) by a pure culture of Bacillus endophyticus strain immobilized on ceramic balls was studied in a packed bed biofilm reactor (PBBR). The biodegradation of 2,4-DCP was studied in fed-batch and continuous mode and the effect of different parameters such as hydraulic retention time (HRT), biogenetic substrate concentration, and loading rate on the removal of 2,4-DCP were evaluated. Field emission scanning electron microscope (FESEM) results established the biofilm formation on the ceramic beads...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
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