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

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https://www.readbyqxmd.com/read/28276318/biosorption-of-copper-ii-from-aqueous-solutions-by-sclerotiogenic-aspergillus-oryzae-g15
#1
Dan-Dan Long Qi Wang Jian-Rong Han
This study aimed at investigating the biosorption of the copper(II) from aqueous solutions by sclerotiogenic Aspergillus oryzae G15. Potentiometric titration analysis results indicated that carboxyl group was mainly responsible for Cu(II) adsorption. Sclerotia were superior biosorbent than mycelia, which could be ascribed to the higher amount of carboxyl sites exposed after differentiation. Langmuir isotherm model fitted well the absorption process of mycelia and sclerotia with the maximum theoretical sorption capacities of 35...
March 8, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28271819/modelization-and-statistical-optimization-of-coagulation-flocculation-treatment-of-an-old-leachate
#2
Ridha Lessoued Fatiha Souahi Leonor C Pelaez
Coagulation/flocculation process was studied using the response surface methodology (RSM) and central composite design(CCD), in order to design the experiments, develop models, evaluate the relationship between operating factors (FeCl3 dose (m) and pH), and provide an efficient method for the treatment of old leachates. The quadratic polynomial models developed for COD and turbidity responses indicated that the optimum conditions were m of 0.82 g/L at pH 5.33 with coefficient of determination R² of 98.88%, 99...
March 7, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28276308/why-is-the-groundwater-level-rising-a-case-study-using-hartt-to-simulate-groundwater-level-dynamics
#3
Yohannes Yihdego Cara Danis Andrew Paffard
Groundwater from a shallow unconfined aquifer at a site in coastal New South Wales has been causing recent water logging issues. A trend of rising groundwater level has been anecdotally observed over the last 10 years. It was not clear whether the changes in groundwater levels were solely natural variations within the groundwater system or whether human interference was driving the level up. Time series topographic images revealed significant surrounding land use changes and human modification to the environment of the groundwater catchment...
February 24, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28130898/phosphorus-removal-characteristics-of-titanium-salts-compared-with-aluminum-salt
#4
Kyeong-Jun Jeona Jong-Ho Kimb Johng-Hwa Ahna
This study evaluates the efficacy of titanium tetrachloride (TiCl4) and titanium sulfate (Ti(SO4)2) on phosphorus (P) removal in synthetic wastewater compared with aluminum sulfate (Al2(SO4)3). Jar test experiments were performed at various chemical doses and initial pH (pHi) levels to determine the conditions at which P removal was most efficient. The doses with 99% P removal were 0.31-0.34 mM for TiCl4, 0.15 mM for Ti(SO4)2, and 0.19 mM for Al2(SO4)3 as Al at 2 mg P/L, 100 mg CaCO3/L, and pHi = 7.0-8.0. The optimum pHi was 7 for TiCl4, 5...
January 27, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28120740/effect-of-cod-n-ratio-on-removal-performances-in-two-subsurface-wastewater-infiltration-systems
#5
Hexin Fei Jing Pan Deli Tong Linli Huang Long Yu Yafei Sun Shiyue Qi Yaoyao Huang
Dissolved oxygen (DO), removal of COD, TP and nitrogen in subsurface wastewater infiltration systems (SWISs)with/without intermittent aeration under different influent COD/N ratios were investigated. Aerobic conditions were effectively developed in 50 cm depth of the matrix and anoxic or anaerobic conditions were not changed in 80 and 110 cm depth by intermittent aeration, which encouraged nitrification. Increased influent COD/N ratio led to lower COD and nitrogen removal in conventional SWISs. Sufficient carbon source in high COD/N ratio influent promoted denitrification with intermittent aeration...
January 24, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28105984/preparation-of-efficient-biobr-mil-88b-fe-composites-with-enhanced-photocatalytic-activities
#6
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
#7
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
#8
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
#9
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
#10
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/28236822/a-simple-two-step-cloud-point-extraction-process-for-removing-fluorescent-whitening-agents-vbl-in-industrial-wastewater-and-recycling-of-surfactant
#11
Juan Han, Xu Tang, Yun Wang, Jing Li, Liang Ni, Lei Wang
  With the enhancement of people's environmental consciousness, the treatment of wastewater was studied as the focus of this paper. Here we present a simple two-step extraction to realize efficient separation of fluorescent whitening agents VBL and cyclic utilization of surfactant to reduce the cost of wastewater treatment and environmental pollution. Firstly, the removal of VBL has been achieved by CPE using TX-114 as nonionic surfactant. The results showed that complete extraction was possible using 1% (w/w) TX-114 for VBL concentration not exceeding 17...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236821/effects-of-reclaimed-water-on-the-characteristics-of-dimethyl-phthalate-adsorption-on-sediments
#12
Zigong Ning, Pengxiang Li, Shuang Zhou, Yunkai Li, Munehide Ishiguro, Wei Zhao, Meie Wang
  Adsorptions of Dimethyl Phthalate (DMP) on three sediments in both reclaimed and ultrapure water were studied using the batch technique and the effects of reclaimed water on it were clarified. The data were interpreted by using Freundlich and Dubinin-Radushkviech models. The values of 1/n were among 0.207 to 0.766, showing the presence of multiple adsorption sites on sediments. Compared with the ultrapure water as the background solution, the adsorption capacities of sediments for DMP were reduced in case of reclaimed water due to the competition of substances in reclaimed water...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236820/developing-an-integrated-modeling-tool-for-river-water-quality-index-assessment
#13
Y C Lai, C C Chien, Z H Yang, Rao Y Surampalli, C M Kao
  The goal of this study was to establish a modeling tool for river water quality with a direct linkage to the water quality index (WQI5) calculation and the river water quality model, the Water Quality Analysis Simulation Program (WASP), for pollutant transport modeling. The integrated WASP and WQI5 tool was field-tested to assess pollutant loadings and their impacts on river environment. Suspended solid (SS) and electric conductivity (EC) correlation equations and the WQI5 calculation tool were included in the water quality model and direct WQI5 calculation...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236819/ultrasonic-destruction-of-acid-orange-7-effect-of-humic-acid-surfactants-and-complex-matrices
#14
Oualid Hamdaoui, Slimane Merouani
  The ultrasonic degradation at 600 kHz of an azo dye, acid orange 7 (AO7), in the presence of various dissolved natural organic matters (humic acid and surfactants) and in environmentally relevant matrices (natural water and seawater) was investigated. Additionally, the dependence of AO7 degradation on several operating parameters was clarified. The obtained results showed that ultrasound completely destroyed AO7 in 90 min of treatment but only 10% of TOC was removed after a long irradiation time. Investigations using the radical scavengers tert-butyl alcohol and KI revealed that AO7 degradation proceeds through radical reactions occurring at the bubble-liquid interface...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236818/selecting-sustainability-indicators-for-small-to-medium-sized-urban-water-systems-using-fuzzy-electre
#15
Gyan Chhipi-Shrestha, Kasun Hewage, Rehan Sadiq
  Urban water systems (UWSs) are challenged by the sustainability perspective. Certain limitations of the sustainability of centralized UWSs and decentralized household level wastewater treatments can be overcome by managing UWSs at an intermediate scale, referred to as small to medium sized UWSs (SMUWSs). SMUWSs are different from large UWSs, mainly in terms of smaller infrastructure, data limitation, smaller service area, and institutional limitations. Moreover, sustainability assessment systems to evaluate the sustainability of an entire UWS are very limited and confined only to large UWSs...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236817/optimal-wastewater-loading-under-conflicting-goals-and-technology-limitations-in-a-riverine-system
#16
Mojtaba Rafiee, Steve W Lyon, Banafsheh Zahraie, Georgia Destouni, Nemat Jaafarzadeh
  This paper investigates a novel simulation-optimization (S-O) framework for identifying optimal treatment levels and treatment processes for multiple wastewater dischargers to rivers. A commonly used water quality simulation model, Qual2K, was linked to a Genetic Algorithm optimization model for exploration of relevant fuzzy objective-function formulations for addressing imprecision and conflicting goals of pollution control agencies and various dischargers. Results showed a dynamic flow dependence of optimal wastewater loading with good convergence to near global optimum...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28236816/assessment-and-ecological-risk-of-heavy-metals-in-sediment-and-molluscs-from-the-mediterranean-coast
#17
Ahmed El Nemr, Ghada F El-Said
  Heavy metal contamination in both sediments and molluscs from the Egyptian Mediterranean coast was investigated. Seawater, sediments, and mollusc samples were collected from representative locations along the coastal area. Different representations of the data set, including, statistical methods (correlation matrix and cluster analyses), various sediment quality assessment methods, and bioaccumulation factor calculation, were combined to investigate the trends of heavy metals, identify pollution sources, and assess sediment quality from a toxicological point of view...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27388981/role-of-micronutrients-on-dyeing-wastewater-treatment-in-activated-sludge-process
#18
Lu Zhou, Biao Peng, Keke Xiao
  Adequate individual supplements of Zn, Co and Mo increased chemical oxygen demand (COD) removal and specific oxygen uptake rates during activated sludge treatment of dyeing wastewater, while overdoses of micronutrients can decrease metabolic rates. The effects of combing Zn, Co, and Mo at different doses were investigated using response surface methodology, with a second order polynomial equation: Y = 78.19+ 0.17X1 + 37.33 X2 + 20.20X3 - 5.58X1X2 - 63.05 X2X3, where Y means COD removal rate (%), X1 means Co concentration, X2 means Zn concentration, X3 means Mo concentration...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27094680/biotreatment-of-petrochemical-wastewater-a-case-study-from-northern-tunisia
#19
Meryem Jemli, Hatem Zaghden, Fatma Rezgi, Sonia Kchaou, Fathi Aloui, Sami Sayadi
  A full-scale study has been conducted to assess the bioaugmentation efficiency of trickling filter process to treat petrochemical wastewater from a lubricant industry recycling waste oils. During 45 weeks, the organic loading rate (OLR) in the trickling filter was increased stepwise from 0.9 to 4 kg of chemical oxygen demand (COD)/(m3·day) at the end of the upgrading period as the flow rate (FR) reached the value of 30 m3/day. The removal, obtained in terms of percentage, for COD ranged from 60 to 84.5 and greater than 98 for total n-alkane (TNA), while those of total kjeldahl nitrogen (TKN) and total phosphor (TP) were about 32 and 55, respectively...
March 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28160782/assessment-of-wetland-hydrological-dynamics-in-a-modified-catchment-basin-case-of-lake-buninjon-victoria-australia
#20
Yohannes Yihdego, John A Webb
  The common method to estimate lake levels is the water balance equation, where water input and output result in lake storage and water level changes. However, all water balance components cannot always be quickly assessed, such as due to significant modification of the catchment area. A method that assesses general changes in lake level can be a useful tool in examining why lakes have different lake level variation patterns. Assessment of wetlands using the dynamics of the historical hydrological and hydrogeological data set can provide important insights into variations in wetland levels in different parts of the world...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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