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Environmental Technology

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https://www.readbyqxmd.com/read/27911220/optimization-of-a-textile-dye-degradation-in-a-recirculating-fluidized-bed-reactor-using-magnetite-s2o8-2-process
#1
Hassan Aghdasinia, Parvin Arehjani, Behrouz Vahid, Alireza Khataee
Optimization of Acid Orange 7 (AO7) treatment using heterogeneous Fenton-like method in a recirculating fluidized-bed reactor (FBR) was investigated by central composite design (CCD). Natural magnetite (NM) as Fenton-like catalyst was characterized using scanning electron microscopy (SEM). Nonlinear CCD model was obtained for prediction of dye degradation as a function of experimental variables such as peroxydisulfate concentration (0.1-0.5 mmol/L), initial AO7 concentration (5-25 mg/L), pH (3-9) and NM dosage (0...
December 2, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27910736/note-to-pore-scale-observation-of-deposit-within-the-gravel-matrix-of-a-vertical-flow-constructed-wetland
#2
None None
No abstract text is available yet for this article.
December 2, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27900917/preparation-of-polyelectrolyte-modified-membranes-for-heavy-metal-ions-removal
#3
M A Mokhter, S Lakard, C Magnenet, M Euvrard, B Lakard
Polyethersulfone membranes were modified by polyelectrolyte (PE) multilayers, made of poly(allylamine hydrochloride) with poly(styrene sulfonate), to remove Cu2+, Zn2+ and Ni2+ heavy metal cations from aqueous solutions in a wide range of metal concentration (50-1200 ppm). After characterization of the modified membranes, the efficiency of the process was estimated for single heavy metal ions solution leading to high rejection rates (> 90% for 50 ppm) and good adsorption capacities (7.0-8.5 mg.cm-2) whatever the metal ion tested...
November 30, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27852162/dissolved-air-flotation-as-a-potential-treatment-process-to-remove-giardia-cysts-from-anaerobically-treated-sewage
#4
Priscila Ribeiro Dos Santos, Luiz Antonio Daniel
Controlling Giardia cysts in sewage is an essential barrier for public health protection, reducing possible routes of protozoa transmission. The aim of this study was to evaluate the capability of dissolved air flotation (DAF), on a bench scale, to remove Giardia cysts from anaerobic effluent. Moreover, removals of indicator microorganisms and physical variables were also investigated. Flocculation conditions were studied, associating different flocculation times with different mean velocity gradients. DAF treatment achieved mean log removals in the range of 2...
November 30, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27852152/application-of-subsurface-vertical-flow-constructed-wetlands-to-reject-water-treatment-in-dairy-wastewater-treatment-plant
#5
Wojciech Dąbrowski, Beata Karolinczak, Magdalena Gajewska, Ewa Wojciechowska
The paper presents the effects of applying subsurface vertical flow constructed wetlands (SS VF) for the treatment of reject water generated in the process of aerobic sewage sludge stabilization in the biggest dairy wastewater treatment plant (WWTP) in Poland. Two SS VF beds were built: bed (A) with 0.65 m depth and bed (B) with 1.0 m depth, planted with reeds. Beds were fed with reject water with hydraulic load of 0.1 m d(-1) in order to establish the differences in treatment efficiency. During an eight-months research period, a high removal efficiency of predominant pollutants was shown: BOD5 88...
November 30, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27852149/remediation-of-acid-mine-drainage-using-microbial-fuel-cell-based-on-sludge-anaerobic-fermentation
#6
Xiang Peng, Tianle Tang, Xiaoqiao Zhu, Gaohui Jia, Yanran Ding, Yawen Chen, Yang Yang, Wenhao Tang
The aim of this work is to utilize the microbial fuel cell for removing metals and sulfate from acid mine drainage using sewage sludge organics and simultaneous electricity generation. The enriched sulfate-reducing mixed culture was used as the cathodic biofilm and the sludge as the substrate. Under anaerobic conditions, 71.2% sulfate, 99.7% heavy metals, and 51.6% total chemical oxygen demand are removed at an electrode spacing of 4 cm and a sludge concentration of 30% (v/v) after 10-day treatment. A maximum power density of 51...
November 30, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27838956/monitoring-of-biofilm-aging-in-a-sphingomonas-sp-strain-from-public-drinking-water-sites-through-changes-in-capacitance
#7
Parul Gulati, Pawandeep Singh, Arun Kumar Chatterjee, Moushumi Ghosh
This study reports the applicability of a capacitance-based technique for evaluating the biofilm progression of Sphingomonas sp. One hundred and forty isolates of Sphingomonas were screened from public drinking water sites, and one potential strain with biofilm-forming ability was used for the study. The biofilm production by this strain was established in microtiter plates and aluminum coupons. The standard biofilm-forming strain Sphingomonas terrae MTCC 7766 was used for comparison. Changes in biofilm were analyzed by energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscope (SEM)...
November 30, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27813454/growth-performances-and-changes-of-macronutrient-ion-concentrations-in-the-culture-medium-when-euglena-gracilis-was-cultured-with-nitrified-digestate
#8
Kenji Takemura, Ryosuke Endo, Toshio Shibuya, Yoshiaki Kitaya
We investigated the possibility of using Euglena gracilis to convert digestate from methane fermentation of organic wastes into a medium for soilless crop culture. The growth of E. gracilis cultured with aqueous solutions containing filtrate of raw digestate at 1-30% (v/v) and nitrified digestate at 10-100% (v/v) was examined. Concentrations of plant macronutrient ions in nitrified digestate before and after culturing E. gracilis were also examined. Specific growth rates in aqueous solutions containing filtrate of raw digestate at 1-10% and nitrified digestate at 10-100% showed no significant differences, respectively (0...
November 30, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27892816/optimization-of-the-pretreatment-of-wastewater-from-a-slaughterhouse-and-packing-plant-through-electrocoagulation-in-a-batch-reactor
#9
Fábio Orssatto, Maria Hermínia Ferreira Tavares, Flávia Manente da Silva, Eduardo Eyng, Brendown Faria Biassi, Leandro Fleck
The purpose of this study is to evaluate the removal of COD (chemical oxygen demand), turbidity and color of wastewater from a pig slaughterhouse and packing plant through the electrochemical technique and to optimize the ΔV(electric potential difference) and HRT (hydraulic retention time) variables in an electrocoagulation batch reactor using aluminum electrodes. The experimental design used was RCCD (Rotatable Central Composite Design). The characteristics of the effluent were 4730 mg L(-1) to COD, 0.0 mg L(-1) to total aluminum, 6...
November 28, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27892815/monitoring-trihalomethanes-and-nitrogenous-disinfection-by-products-in-blending-desalinated-waters-using-solid%C3%A2-phase-microextraction-and-gas-chromatography
#10
Providencia González-Hernández, Manuel Hernández-Padrón, Verónica Pino, Ana M Afonso, Juan H Ayala
A simple and efficient method has been developed for the extraction and determination of sixteen common volatile halogenated disinfection by-products (DBPs) in blending desalinated waters, using headspace solid-phase microextraction and gas chromatography with flame-ionization detection (HS-SPME/GC-FID). The DBPs determined included 4 trihalomethanes, 6 haloacetonitriles and 6 halonitromethanes. After the optimization using factorial designs of the HS-SPME parameters (optimum: carboxen/polydimethylsiloxane (CAR/PDMS) fiber, extraction time of 60 min at 30 °C, pH 7, addition of 40% (w/v) of sodium chloride, and desorption time of 2 min at 250 °C), quantification limits ranged from 3...
November 28, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27892814/a-new-route-of-bioaugmentation-by-allochthonous-and-autochthonous-through-biofilm-bacteria-for-scod-removal-of-old-leachate
#11
Rashid Alijani Ardeshir, Sara Rastgar, Majid Peyravi, Mohsen Jahanshahi, Ali Shokuhi Rad
Landfill leachate contains environmental pollutants that are generally resistant to biodegradation. In this study, indigenous and exogenous bacteria in leachate were acclimated in both biofilm and suspension forms to increase the removal of SCOD (soluble chemical oxygen demand). The bacteria from the leachate and sewage were acclimated to gradually increasing leachate concentration prepared using a reverse osmosis membrane over 28 days. The SCOD removal was measured aerobically or nominally anaerobically. Biofilms were prepared using different carrier media (glass, rubber, and plastic)...
November 28, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27884094/synthesis-characterization-and-photocatalytic-activity-of-sonochemical-hydration-dehydration-prepared-zno-rod-like-architecture-nano-microstructures-assisted-by-a-biotemplate
#12
Ayad F Alkaim, Enas M Alrobayi, Abrar M Algubili, Aseel M Aljeboree
ZnO nanoparticles of rod-like architecture have excellent potential to be used in wastewater treatment as a photocatalyst. They were synthesized by utilizing sonochemical/hydration- dehydration techniques using glutamine as a biotemplate. The effects of calcination temperatures, that is, 300°C, 500°C, and 700°C, on the crystallinity, optical properties, and photocatalytic activity of synthesized zinc oxide nanoparticles were investigated. X-ray diffraction (XRD) results indicated that all calcinated samples have a crystalline hexagonal wurtzite structure...
November 25, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27882824/simultaneous-recovery-of-phosphorus-and-potassium-as-magnesium-potassium-phosphate-from-synthetic-sewage-sludge-effluent
#13
Satoshi Nakao, Takayuki Nishio, Yoshinori Kanjo
No abstract text is available yet for this article.
November 24, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27875936/characterization-of-dust-from-blast-furnace-cast-house-de-dusting
#14
Christof Lanzerstorfer
During casting of liquid iron and slag a considerable amount of dust is emitted into the cast house of a blast furnace. Usually, this dust is extracted via exhaust hoods and subsequently separated from the ventilation air. In most blast furnaces the cast house dust is recycled. In this study a sample of cast house dust was split by air classification into five size fractions which were then analysed. Micrographs showed that the dominating particle type in all size fractions is that of single spherical-shaped particles...
November 23, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27875932/hybrid-soliwave-technique-for-mitigating-sulfate-reducing-bacteria-in-controlling-biocorrosion-a-case-study-on-crude-oil-sample
#15
Muhammad Khairool Fahmy Bin Mohd Ali, Akrima Abu Bakar, Norhazilan Md Noor, Nordin Yahaya, Mardhiah Ismail, Ahmad Safuan Rashid
Corrosion is one of the leading causes of failure in onshore and offshore transmission pipelines, threatening pipeline integrity internally and externally. Microbiologically Influenced Corrosion (MIC) is among the common corrosion types for buried and deep-water pipelines that result in costly repair and pipeline failure. Sulfate Reducing Bacteria (SRB) are commonly known as the culprit of MIC. Many countries have very stringent regulations for the usage of chemical substances (biocides) to inhibit microorganism growth...
November 23, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27869542/treatment-challenge-of-a-non-toxic-cyanobacterium-romeria-elegans-bloom-event-in-a-south-australian-wastewater-treatment-plant-a-case-study
#16
Radisti A Praptiwi, Carlos J Pestana, Emma T Sawade, Nick Swain, Gretchen Schroeder, Gayle Newcombe
A bloom of the non-toxic cyanobacterium Romeria elegans in waste stabilisation ponds within Angaston waste water treatment plant (WWTP) has posed an unprecedented treatment challenge for the local water utility. The water from the stabilisation ponds is chlorinated for safety prior to reuse on nearby farmland. Cyanobacteria concentrations of approximately 1.2×10(6) cells mL(-1) increased the chlorine demand dramatically. Operators continuously increased the disinfectant dose up to 50 mg L(-1) to achieve operational guideline values for combined chlorine (0...
November 21, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27804788/investigation-of-mechanism-and-critical-parameters-for-removal-of-arsenic-from-water-using-zr-tio2-composite
#17
I Anđelković, N R R Amaizah, S B Marković, D Stanković, M Marković, D Kuzmanović, G Roglić
Using the microwave-hydrothermal method for the synthesis of composite, high surface density of hydroxyl groups, as an active adsorption sites for arsenic, was obtained. Adsorption mechanisms of As(III) and As(V) onto zirconium-doped titanium dioxide (Zr-TiO2) were investigated and proposed using macroscopic and microscopic methods. Obtained results are suggesting inner-sphere and outer-sphere adsorption mechanisms for As(III) and As(V), respectively. This allowed us to identify parameters that are critical for the successful removal of arsenic from water, which is essential information for further optimization of the removal process...
November 21, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27790947/spirulina-platensis-is-more-efficient-than-chlorella-homosphaera-in-carbohydrate-productivity
#18
Ana Cláudia Margarites, Noany Volpato, Elenara Araújo, Luana Garbin Cardoso, Telma Elita Bertolin, Luciane Maria Colla, Jorge Alberto Vieira Costa
This study aimed to compare the production of biomass with high carbohydrate content by Spirulina platensis LEB 52 and Chlorella homosphaera microalgae. The cultivation of C. homosphaera and S. platensis LEB 52 was performed in standard medium diluted at 50%, and glucose was added as a source of organic carbon for mixotrophic metabolism. The sodium nitrate concentration was increased and the nitrogen components were reduced in the media to induce the synthesis of carbohydrates. C. homosphaera and S. platensis LEB 52 produced 16...
November 21, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27784197/effect-of-volatile-fatty-acids-in-anaerobic-conditions-on-viability-of-helminth-ova-ascaris-suum-in-sanitization-of-municipal-sludge
#19
Marcelo Rojas-Oropeza, Alejandro S Hernández-Uresti, Luis S Ortega-Charleston, Nathalie Cabirol
The present work aimed at evaluating the effect of four different mixtures of diverse volatile fatty acids (VFAs) on the viability of helminth ova (Ascaris suum), under mesophilic (35°C) anaerobic conditions and at different incubation times, in order to reproduce the process of two-phase anaerobic digestion. The mixtures of VFAs contained acetic, propionic, butyric, valeric, and isovaleric acids, used at concentrations normally found in acidogenic anaerobic digesters. The four treatments all showed a reduction in Ascaris suum ova viability, among which Treatment III (4...
November 21, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27868689/effect-of-long-term-application-of-pretilachlor-on-its-persistence-and-residues-in-paddy-crop
#20
Pervinder Kaur, Paawan Kaur, Anil Duhan, Makhan Singh Bhullar
The effect of long-term application of pretilachlor to paddy in rice-wheat cropping system was investigated from 1997-2015. Additionally, in 2013 field experiment was also conducted where pretilachlor was applied to paddy field having no background of its application. Matrix solid phase dispersion was used for extraction of pretilachlor from paddy soil and paddy grain samples and residues were quantified using high-performance liquid chromatography (HPLC). The average recoveries of pretilachlor from paddy soil, paddy grain and straw samples ranged from 80...
November 20, 2016: Environmental Technology
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