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

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https://www.readbyqxmd.com/read/28130898/phosphorus-removal-characteristics-of-titanium-salts-compared-with-aluminum-salt
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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/28160782/assessment-of-wetland-hydrological-dynamics-in-a-modified-catchment-basin-case-of-lake-buninjon-victoria-australia
#12
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
https://www.readbyqxmd.com/read/28160781/multi-year-microbial-source-tracking-study-characterizing-fecal-contamination-in-an-urban-watershed
#13
Rebecca N Bushon, Amie M G Brady, Eric D Christensen, Erin A Stelzer
  Microbiological and hydrological data were used to rank tributary stream contributions of bacteria to the Little Blue River in Independence, Missouri. Concentrations, loadings and yields of E. coli and microbial source tracking (MST) markers, were characterized during base flow and storm events in five subbasins within Independence, as well as sources entering and leaving the city through the river. The E. coli water quality threshold was exceeded in 29% of base-flow and 89% of storm-event samples. The total contribution of E...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28160780/pilot-scale-evaluation-of-ph-based-control-of-single-stage-deammonification-processes-for-sidestream-treatment
#14
David M Graham, Domènec Jolis
  Pilot scale sidestream reactors, utilizing a pH-based control strategy, were operated at the San Francisco Public Utilities Commission (SFPUC), Southeast Plant (SEP) for the biological treatment of anaerobically digested sludge centrate using combined partial nitritation/anaerobic ammonium oxidation (anammox) as the main nitrogen removal pathway. Reactors were setup to functionally simulate two full-scale commercial processes common to the industry using nonproprietary, flexible, pH-based process control strategy...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27196401/simultaneous-bioreduction-of-multiple-oxidized-contaminants-using-a-membrane-biofilm-reactor
#15
Haixiang Li, Hua Lin, Xiaoyin Xu, Minmin Jiang, Chein-Chi Chang, Siqing Xia
  This study tests a hydrogen-based membrane biofilm reactor (MBfR) to investigate simultaneous bioreduction of selected oxidized contaminants, including nitrate (<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00178-ilm01.gif"/>-N), sulfate (<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00178-ilm15.gif"/>), bromate (<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00178-ilm26.gif"/>), chromate (Cr(VI)) and para-chloronitrobenzene (p-CNB)...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27196308/production-of-biosurfactants-by-pseudomonas-species-for-application-in-the-petroleum-industry
#16
Maria Aparecida M Silva, Aline F Silva, Raquel D Rufino, Juliana M Luna, Valdemir A Santos, Leonie A Sarubbo
  The production of surfactants by microorganisms has become an attractive option in the treatment of oil-contaminated environments because biosurfactants are biodegradable and less toxic than synthetic surfactants, although production costs remain high. With the aim of reducing the cost of biosurfactant production, three strains of Pseudomonas (designated P1, P2, and P3) were cultivated in a low-cost medium containing molasses and corn steep liquor as substrates. Following the selection of the best producer (P3), a rotational central composite design (RCCD) was used to determine the influence of substrates concentration on surface tension and biosurfactant yield...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27094908/redox-and-temperature-dependent-attenuation-of-twenty-organic-micropollutants-a-systematic-column-study
#17
Victoria Burke, Janek Greskowiak, Nele Grünenbaum, Gudrun Massmann
  Owing to advanced analytical procedures an increasing number of organic micropollutants have been identified within the aquatic environment. Results from field investigations evidenced the attenuation of various organic micropollutants to be impacted by the predominant hydrochemical conditions. In the course of this study, column experiments were performed to examine the influence of redox conditions and temperature on the attenuation of 20 wastewater derived organic micropollutants. For this purpose, the degradation behavior of these compounds were investigated under oxic, nitrate reducing, iron/manganese reducing and sulfidic conditions at 21 °C in sandy aquifer sediments...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27086857/utilization-of-drinking-water-treatment-slurry-to-produce-aluminum-sulfate-coagulant
#18
Mahmoud M Fouad, Taha M A Razek, Ahmed S Elgendy
  In Egypt, water treatment consumes about 365 000 tons of aluminum sulfate and produces more than 100 million tons of sludge per year. The common disposal system of sludge in Egypt is to discharge it into natural waterways. Toxicity of aluminum, environmental regulations and costs of chemicals used in water treatment and sludge treatment processes led to an evaluation of coagulant recovery and subsequent reuse. The present work aimed at aluminum recovery from sludge of El-Shiekh Zayd water treatment plant (WTP) to produce aluminum sulfate coagulant...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27080850/adsorption-of-compounds-that-mimic-urban-stormwater-dissolved-organic-nitrogen
#19
Mehrdad Mohtadi, Bruce R James, Allen P Davis
  Stormwater runoff carrying nitrogen can accelerate eutrophication. Bioretention facilities are among low impact development systems which are commonly used to manage urban stormwater quality and quantity. They are, however, not designed to remove dissolved organic nitrogen (DON) and may become a net DON exporter. Adsorption of seven organic nitrogenous compounds onto several adsorbents was examined. Batch adsorption study revealed that coal activated carbon (AC) exhibited the best performance in adsorption of the selected organic nitrogenous compounds...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27074790/use-of-cod-toc-and-fluorescence-spectroscopy-to-estimate-bod-in-wastewater
#20
Evelyn Christian, Jacimaria R Batista, Daniel Gerrity
  Common to all National Pollutant Discharge Elimination System (NPDES) permits in the United States is a limit on biochemical oxygen demand (BOD). Chemical oxygen demand (COD), total organic carbon (TOC), and fluorescence spectroscopy are also capable of quantifying organic content, although the mechanisms of quantification and the organic fractions targeted differ for each test. This study explores correlations between BOD5 and these alternate test procedures using facility influent, primary effluent, and facility effluent samples from a full-scale water resource recovery facility...
February 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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