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Environmental Technology

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https://www.readbyqxmd.com/read/28925326/a-nitrogen-transformation-model-for-multi-layer-enhanced-groundwater-remediation-technology
#1
Yu Yang, Zhifei Ma, Yonghai Jiang, Xinying Lian, Beidou Xi, Yu Pei
The multi-layer enhanced groundwater remediation technology (MET) is an innovative platform that integrates physical chemistry, bioremediation, and phytoremediation technology to safely and effectively remediate ammonia nitrogen in groundwater. A nitrogen transformation model was established to study the mechanism of nitrogen transformation within ammonia nitrogen removal in the MET. The model considered organic nitrogen, ammonia nitrogen, and nitrate nitrogen as the variables, and ammonification, nitrification, denitrification, microbial assimilation, plant absorption, adsorption-desorption, and volatilization as the influencing factors...
September 19, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28920774/kinetics-of-diuron-under-aerobic-condition-and-residue-analysis-in-sugarcane-under-subtropical-field-conditions
#2
Shishir Tandon, Ravi Pant
Phenylureas group are persistent herbicides compared to other groups. However, their dissipation in different ecosystem should be investigated as they are major pollutant to soil and water. Dissipation kinetics of diuron at two application rates, in texturally different soils under sugarcane field conditions was investigated. Diuron was extracted from the soil with acetone and florisil SPE cleanup and extracted diuron was characterized by HPLC-UV. Diuron dissipated slowly in soils and persisted for more than 100 days...
September 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28918708/removal-of-sulfadiazine-and-tetracycline-in-membrane-bioreactors-mbrs-linking-pathway-to-microbial-community-shift
#3
Ronghua Xu, Zhiyong Wu, Zhongbo Zhou, Fangang Meng
In this study, the removal pathway of sulfadiazine (SDZ) and tetracycline (TC) and their roles in shaping microbial community were separately explored in two lab-scale membrane bioreactors (MBRs) operating in parallel with one control MBR. Results show that the MBR system eliminated more than 90% of TC in the feed, whereas removal efficiency of SDZ decreased from 100% to 40% with increasing SDZ concentrations (1-1000 μg/L). Based on batch tests, biodegradation and adsorption was the main removal route for SDZ and TC, respectively...
September 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28914183/enhancing-mercury-removal-across-air-pollution-control-devices-for-coal-fired-power-plants-by-desulfurization-wastewater-evaporation
#4
Hu Bin, Yi Yang, Liang Cai, Yang Linjun, Szczepan Roszak
Desulfurization wastewater evaporation technology is used to enhance the removal of gaseous mercury (Hg) in conventional air pollution control devices (APCDs) for coal-fired power plants. It had been studied that gaseous Hg is oxidized and removed by selective catalytic reduction (SCR), an electrostatic precipitator (ESP) and a wet flue gas desulfurization (WFGD) in coal-fired thermal experiment platform with WFGD wastewater evaporation. Effects of desulfurization wastewater evaporation position, evaporation temperature, and chlorine ion concentration on Hg oxidation were studied as well...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28914181/remediation-approach-for-organic-compounds-and-arsenic-co-contaminated-soil-using-pressurized-hot-water-extraction-process
#5
Mohammad Nazrul Islam, Young-Tae Jo, Yeon-Jae Jeong, Jeong-Hun Park
Successful remediation of soil with co-existing organics contaminants and arsenic (As) is a challenge as the chemical and remediation technologies are different for each group of pollutants. In this study, the treatment effectiveness of pressurized hot water (PHW) extraction process was investigated for remediation of soil co-contaminated with phenol, crude oil, polycyclic aromatic hydrocarbons (PAHs) and As. An elimination percentage of about 99% was achieved for phenol, and in the range of 63-100% was observed for the PAHs at 260 °C for 90 min operation...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28914168/synthesis-of-cr-3-doped-tio2-nanoparticles-characterization-and-evaluation-of-their-visible-photocatalytic-performance-and-stability
#6
Sandra Yadira Mendiola-Alvarez, Jorge Luis Guzmán-Mar, Gemma Turnes-Palomino, Fernando Maya-Alejandro, Adolfo Caballero-Quintero, Aracely Hernández-Ramírez, Laura Hinojosa-Reyes
Cr(3+)-doped TiO2 nanoparticles (Ti-Cr) were synthesized by a simple and fast microwave assisted sol-gel method. Ti-Cr catalyst was characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), N2 adsorption-desorption analysis, Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy, X-ray photoelectron spectroscopy (XPS) and zetametry. Ti-Cr is mesoporous and exhibits a specific surface area of 54...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28911271/chitosan-modification-persimmon-tannin-bioadsorbent-for-highly-efficiency-removal-of-pb-ii-from-aqueous-environment-the-adsorption-equilibrium-kinetics-and-thermodynamics
#7
Xiaojuan Li, Zhongmin Wang, Haijun Liang, Jingliang Ning, Guiyin Li, Zhide Zhou
Lead (Pb) pollution has triggered a great threat to ecological system as well as public health due to its highly toxic and mutagenic properties. In this study, chitosan surface modified persimmon tannin (PT-CS) biomass composite as an environmental friendly bioadsorbent for highly efficient removal of Pb(II) from aqueous solutions was investigated. FT-IR, XRD, SEM, BET, XPS and Zeta potential were used to elucidate the adsorption mechanism. Combining of oxidation reaction, electrostatic interaction and chelation reaction, PT-CS exhibited fine adsorption performance to Pb(II)...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28911270/effective-partial-nitrification-of-ammonia-in-a-fluidized-bed-bioreactor
#8
Haolong Wang, Mingu Kim, Kai Li, Yuanyuan Shao, Jesse Zhu, George Nakhla
A lab-scale fluidized bed bioreactor with high-density polyethylene as biofilm carrier media was operated to study partial nitrification performance with high ammonia concentrations. The system was run at nitrogen loading rates (NLR) from 1.2 to 4.8 kg N/(m(3)·d) with empty bed contact time (EBCT) of 2.0 hrs and 2.7 hrs and four different influent ammonia concentrations of 100, 200, 300 and 400 mg/L. Dissolved oxygen concentration and temperature were maintained around 1.3 mg/L and 35˚C, respectively. Stable partial nitrification was successfully achieved during the whole period with low effluent NO3-N concentration at less than 15 mg/L, due to effective suppression of nitrite-oxidizing bacteria activity (NOB) at high concentrations of free ammonia (5...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28911269/applicability-of-two-dimensional-surface-model-in-bacterial-biosorption-system-an-advanced-approach-in-bioremediation-of-metal-ions
#9
Vishal Mishra
The surface of Bacillus VMSDCM accession no. HQ108109 has been characterized at various pH values of the experimental solution. The boundary values of conditional parameter were used to develop a mathematical six lumped stochastic model for studying the surface chemistry of the bacterium cells. The results of the model were statistically analyzed to understand the strength of the proposed model. The simulation of the model was performed in Turbo C++ interface. The convergence values of the model were recorded and all the asymptotic points were neglected...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28893149/how-the-nature-of-the-compounds-present-in-solid-and-liquid-compartments-of-activated-sludge-impact-its-rheological-characteristics
#10
L Vachou, E Ruiz, M Delalonde, C Wisniewski
No abstract text is available yet for this article.
September 12, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28893154/anthropogenic-activity-induced-water-quality-degradation-in-loktak-lake-a-ramsar-site-in-indo-burma-biodiversity-hotspot
#11
Rajiv Das Kangabam, Munisamy Govindaraju
Wetland contribute to human well-being and poverty alleviation. The increase in human population lead to more demand for water and degradation of the water bodies around the globe, resulting in scarcity of water. The aim of the present study is to assess the impact of anthropogenic activity on water quality of Loktak Lake. Water samples were collected seasonally viz monsoon, post monsoon, winter and pre-monsoon during 2013-2014 from 10 sites. For each water sample, 20 physicochemical parameters were analyzed using the American Public Health Association method...
September 11, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28891420/influence-of-al-iii-on-biofilm-and-its-extracellular-polymeric-substances%C3%AF-eps%C3%AF-in-sequencing-batch-biofilm-reactors-sbbrs
#12
Xuewei Hu, Lei Yang, Xinke Lai, Qi Yao, Kai Chen
This paper presented the influence of Al (III) on biodegradability, micromorphology, composition and functional groups characteristics of the biofilm extracellular polymeric substances (EPS), during different growth phases. The sequencing batch biofilm reactors (SBBRs) were developed to cultivate biofilms under different Al (III) dosage. The results elucidated that Al (III) affected biofilm development adversely at the beginning of biofilm growth, but promoted the biofilm mass and improved the biofilm activity with the growth of biofilm...
September 11, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28891396/dielectric-and-electric-properties-as-a-tool-to-investigate-the-coagulation-mechanism-during-sludge-treatment
#13
A Mortadi, El G Chahid, H Nasrellah, O Cherkaoui, R El Moznine
The analysis of the complex permittivity, electrical complex modulus, and the hopping conductivity have been employed in order to investigate the impacts of calcium oxide during sludge treatment in textile such as coagulation process. In this context, impedance measurement was performed on five samples including raw sludge and four compositions containing different amount of calcium oxide: 2, 3, 4, 5%(w/w). The dielectric spectra of each composition were described by the summation of a power law and a Cole-Cole relaxation model...
September 11, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28891384/nutrient-and-organic-matter-removal-from-low-strength-sewage-treated-with-constructed-wetlands
#14
D Mello, K Q Carvalho, F H Passig, F B Freire, A C Borges, M X Lima, G R Marcelino
In this study, the role of Eichhornia crassipes for removing pollutants from low strength sewage was evaluated. For that, three pilot scale constructed wetlands (CW) were built: CW 1, planted with E. crassipes in a filter media; CW 2, unplanted, composed only by filter media; and CW 3 composed only of E. crassipes floating on the sewage. The operation of these systems was divided in three stages varying the nominal hydraulic retention time (HRT) in: (I) 24 h; (II) 48 h; and (III) 72 h. Temporal sampling profiles were carried out with collection of samples from the influent and effluent of the CWs to determine temperature, pH, COD, TKN and TP...
September 11, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28884633/oxidative-removal-of-aromatic-amino-acids-by-manganese-dioxide-kinetic-modeling-and-effect-of-co-solutes
#15
Yong Chen, Jing Su, Lu Liu, Yiling Zhou, Jiaolan Zuo, Zongping Wang, Tao Tao
The degradation of aromatic amino acids including L-tryptophan, L-tyrosine and L-phenylalanine by δ-MnO2 was investigated. L-tryptophan and L-tyrosine underwent rapid oxidative degradation in the δ-MnO2 suspension solution. In contrast, L-phenylalanine was not oxidized by δ-MnO2. The degradation of L-tryptophan was faster than that of L-tyrosine. The oxidation rates of amino acids increased with increasing concentration of δ-MnO2. The increase of concentrations of substrates and pH disfavored the degradation...
September 8, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28845748/dopamine-crosslinked-graphene-oxide-membrane-for-simultaneous-removal-of-organic-pollutants-and-trace-heavy-metals-from-aqueous-solution
#16
Jing Wang, Tiefan Huang, Lin Zhang, Qiming Jimmy Yu, Li'an Hou
A graphene oxide-polydopamine-(β-cyclodextrin) (GPC) ultrafiltration membrane was fabricated by using the method of drop-coating combined with vacuum filtration. The prepared GPC membrane was characterized with FTIR and XPS spectrophotometry and evaluated for its performances for the rejection of organic molecules (methylene blue) and adsorption of trace heavy metals (Pb(2+)) from aqueous solutions. The membrane exhibited an excellent rejection coefficient of 99.2% for methylene blue and the permeation flux was 12 L m(-2) h(-1) at 0...
September 8, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28880121/improvement-of-anti-biofouling-properties-of-hollow-fiber-membranes-with-bismuth-bal-chelates-bisbal
#17
F N S Yavuz, R Sengur Tasdemir, T Turken, G M Urper, I Koyuncu
In this study, hollow fiber membranes with and without BisBAL additive was fabricated. Membranes were characterized in terms of permeability, surface properties, anti-biofouling and anti-bacterial properties. Membranes were operated in lab-scale submerged membrane bioreactor. During MBR operation; flux, chemical oxygen demand, volatile suspended solids and suspended solids were calculated for 30 days. Results showed that extracellular polymeric substance and soluble microbial product amounts were decreased in BisBAL containing membranes...
September 7, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28877651/production-of-a-bioflocculant-from-klebsiella-sp-os-1-using-brewery-wastewater-as-a-source
#18
Lili Ma, Jingjing Liang, Shanyi Wang, Bing Yang, Mingyan Chen, Yucheng Liu
Abstracts This study evaluated the potential of bioflocculant production from a Klebsiella strain using brewery wastewater as nutrients. The bioflocculant named OS-1B produced by Klebsiella sp. OS-1 exhibited a good flocculating activity to kaolin clay suspension (around 95%), when the diluted brewery wastewater with 7.2 mg/L total nitrogen and 1013 mg/L CODCr, was used as a nitrogen source. Glucose (15 g/L) is the most favorable carbon source for Klebsiella sp. OS-1 in bioflocculant production from the brewery wastewater...
September 7, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28829239/investigating-the-photocatalytic-degradation-property-of-pt-pd-and-ni-nanoparticles-loaded-tio2-nanotubes-powder-prepared-via-rapid-breakdown-anodization
#19
T Manovah David, P Wilson, R Mahesh, S Dhanavel, Shamima Hussain, S Jacob Melvin Boby, A Stephen, C Ramesh, P Sagayaraj
The present study was performed to investigate the photocatalytic efficiency of the titania (TiO2) nanotubes (NTs) powder prepared via rapid breakdown anodization sensitized individually with Ni, Pd and Pt metal nanoparticles (NPs). The TiO2 NTs powder had the length of 5-6 μm, with the outer diameter between 20 and 25 nm and the wall thickness of 3-4 nm as observed in the scanning and transmission electron microscopes. The crystal structure analysis employing X-ray diffraction indicated the presence of Pt, Pd and Ni NPs in face-centered cubic phase over the anatase TiO2 NTs powder...
September 7, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28876171/zinc-leaching-behavior-in-semi-aerobic-landfill
#20
Lifang Hu, Yuyang Long
Municipal solid waste landfills require continous monitoring because that the environmental change may trigger sudden release of heavy metals and need special care. In this research, three simulated landfills with different operation modes were used to investigate the behavior of Zn during the decomposition process. It is difficult to evaluate the effects of landfill operating modes on the release of heavy metals because the Zn concentration variation in leachate is similar in all three landfill types. However, the cumulative amount of Zn leached differed significantly with the landfill degradation degree...
September 6, 2017: Environmental Technology
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