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Zahra Derakhshan, Amir Hossein Mahvi, Mohammad Hassan Ehrampoush, Mohammad Taghi Ghaneian, Saeed Yousefinejad, Mohammad Faramarzian, Seyed Mohammad Mazloomi, Mansooreh Dehghani, Hossein Fallahzadeh
In this lab-scale study, the feasibility of using kenaf fibers as moving bed biofilm carriers in hybrid microalgal membrane photobioreactors (HMPBR) in organic matter and atrazine elimination from real secondary effluent was evaluated. For evaluating the kinetics of biofilm substrate consumption, an experimental model was proposed. Inoculation of wastewater samples with free carriers resulted in the greater removal of target pollutants. Removal efficiency of atrazine and chemical oxygen demand (COD) increased to 27% and 16%, with respect to the control, respectively...
January 16, 2018: Ecotoxicology and Environmental Safety
R E Rodríguez-Lugo, M A Chacón-Terán, S De León, M Vogt, A J Rosenthal, V R Landaeta
The synthesis and characterization of the ligand tris(quinolin-8-yl)phosphite, (P(Oquin)3), are described and its coordination chemistry toward the metal precursor [Pd(COD)Cl2] (COD = 1,5-cyclooctadiene, C8H12) is reported. A new Pd(ii)-P(Oquin)3 metal complex was isolated and fully characterized ([Pd{P(Oquin)3}Cl2]), and its X-ray diffraction analysis shows that the phosphite ligand coordinates as a bidentate P-N chelate. This complex is an efficient catalyst for the solvent-free mild oxidative coupling of primary amines to imines using air as an oxidant, obtaining moderate to good yields (up to 99%) and turnover numbers (TONs up to 230)...
January 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Sandhya Maurya, Achlesh Daverey
In this study, four plant-based natural coagulants (banana peel powder, banana stem juice, papaya seed powder and neem leaf powder) were evaluated for the removal of turbidity, chemical oxygen demand (COD) and total suspended solids (TSS) from municipal wastewater. The experiments were conducted at room temperature without adjusting the initial pH. The maximum turbidity removal was observed with banana peel powder (59.6%) at 0.4 g/L of dosage. Papaya seed powder and banana stem juice were the most effective for TSS removal (66...
January 2018: 3 Biotech
Mengjie Pu, Zeyu Guan, Yongwen Ma, Jinquan Wan, Yan Wang, Mark L Brusseau, Haiyuan Chi
A series of MIL-53(Fe) materials were synthesized using a solvothermal method under different temperature and time conditions and were used as catalysts to activate persulfate and degrade Orange G (OG). Influences of the above conditions on the crystal structure and catalytic behavior were investigated. Degradation of OG under different conditions was evaluated, and the possible activation mechanism was speculated. The results indicate that high synthesis temperature (larger than 170 °C) leads to poor crystallinity and low catalytic activity, while MIL-53(Fe) cannot fully develop at low temperature (100 or 120 °C)...
January 5, 2018: Applied Catalysis. A, General
Tanner R Devlin, Jan A Oleszkiewicz
Formation of aerobic granular sludge was examined in a novel continuous flow configuration, at 20 ± 1 °C. Synthetic proteinaceous wastewater with municipal primary effluent characteristics was used (i.e., COD = 370 ± 30 mg/L; TN = 43 ± 7 mg/L; and TP = 10 ± 2 mg/L). Various levels of selective pressure were applied after inoculation with flocculent sludge (i.e., estimated velocity gradients during settling between 1 and 9 1/s). Impeller rpm of 15 and below generated floccular-granular biomass, while 20 rpm and above generated large granules with a filamentous population...
January 11, 2018: Bioresource Technology
K Tamilarasan, P Arulazhagan, R Uma Rani, S Kaliappan, J Rajesh Banu
An exploration into the symbiotic impact of sonic-tenside (SDBS - sodium dodecyl benzene sulfonate) on biomass disintegration potential and to reduce the energy consumption was studied. At optimized condition (specific energy input 9600 kJ/kg TS; SDBS dosage 0.07 g/g SS), higher percentage of biomass lysis and solids reduction (23.9% and 19.8%) was obtained in blended sonic-tenside disintegration (STD), than sonic disintegration (SD) (17.6% and 9.8%). The bioacidogenic potential (BAP) assay in terms of volatile fatty acids (VFA) production (722 mg/L) was found to be higher for STD, in comparison to SD (350 mg/L)...
January 6, 2018: Bioresource Technology
Mikko Vihtakari, Jorg Welcker, Børge Moe, Olivier Chastel, Sabrina Tartu, Haakon Hop, Claus Bech, Sébastien Descamps, Geir Wing Gabrielsen
Climate warming is rapidly altering marine ecosystems towards a more temperate state on the European side of the Arctic. However, this "Atlantification" has rarely been confirmed, as long-term datasets on Arctic marine organisms are scarce. We present a 19-year time series (1982-2016) of diet samples from black-legged kittiwakes as an indicator of the changes in a high Arctic marine ecosystem (Kongsfjorden, Svalbard). Our results highlight a shift from Arctic prey dominance until 2006 to a more mixed diet with high contribution of Atlantic fishes...
January 19, 2018: Scientific Reports
Shuhao Huo, Feifei Zhu, Bin Zou, Ling Xu, Fengjie Cui, Wenhua You
OBJECTIVES: To demonstrate the effectiveness of a novel two-stage system coupling hydrolytic acidification with algal microcosms for the treatment of acrylonitrile butadiene styrene (ABS) resin-manufacturing wastewater. RESULTS: After hydrolytic acidification, the BOD5/COD ratio increased from 0.22 to 0.56, showing improved biodegradability of the wastewater. Coupled with hydrolytic acidification, the algal microcosms showed excellent capability of in-depth removal of COD, NH3-N and phosphorus with removal rates 83, 100, and 89%, respectively, and aromatic pollutants, including benzene, were almost completely removed...
January 18, 2018: Biotechnology Letters
Sofia Bonilla, Zahra Choolaei, Torsten Meyer, Elizabeth A Edwards, Alexander F Yakunin, D Grant Allen
Anaerobic digestion of biosludge has not yet been implemented in pulp mills due to low biogas yields. Enzymatic pretreatment of biosludge has shown improvements in biogas yields but results are varied. A key limitation of previous studies is that they fail to consider the COD contribution from the enzyme solutions. The aim of this study was to systematically investigate the potential for enzymatic pretreatment on the anaerobic digestibility of pulp mill biosludge. Out of the six enzymes tested, four enhanced the anaerobic digestibility of biosludge...
March 2018: Biotechnology Reports
William E Platten, Pablo Campo, Makram T Suidan, Albert D Venosa
  The biomass concentrator reactor (BCR), a gravity flow membrane bioreactor (MBR) design, was evaluated for use in treating a municipal wastewater stream. The BCR operates with less than 2.5 cm of pressure head and uses a 3 to 4 mm thick tortuous path membrane with pore size ranging from 18 to 28 μm to achieve solids separation. A two-stage, aerobic/anoxic reactor was evaluated for the removal of chemical oxygen demand (COD), ammonia, total nitrogen, and solids separation. The reactor was fed 72 L/day, with a hydraulic retention time of 9...
February 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
Margarida Castro, Verónica Nogueira, Isabel Lopes, Maria N Vieira, Teresa Rocha-Santos, Ruth Pereira
This study aimed to explore the efficiency of two adsorbents, cork granules with different granulometry and titanium dioxide nanomaterial, in the removal of chemical oxygen demand (COD), colour and toxicity from a textile effluent. The adsorption assays with cork were unsatisfactory in the removal of chemical parameters however they eliminated the acute toxicity of the raw effluent to Daphnia magna. The assay with TiO2 NM did not prove to be efficient in the removal of colour and COD even after 240 min of contact; nevertheless it also reduced the raw effluent toxicity...
January 18, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Luka Svilar, Julen Castellano, Igor Jukic, David Casamichana
PURPOSE: The purpose of this paper was to study the structure of interrelationships among external training load measures and how these vary among different positions in elite basketball. METHODS: Eight external variables of jumping (JUMP), acceleration (ACC), deceleration (DEC) and change of direction (COD), and two internal load variables (RPE and sRPE) were collected from 13 professional players with 300 session records. Three playing positions were considered: guards (n=4), forwards (n=4) and centers (n=5)...
January 18, 2018: International Journal of Sports Physiology and Performance
Davide Ferioli, Andrea Bosio, Johann C Bilsborough, Antonio La Torre, Michele Tornaghi, Ermanno Rampinini
PURPOSE: To investigate the 1) effect of the preparation period on the neuromuscular characteristics of 12 professional (PRO) and 16 semi-professional (SEMI-PRO) basketball players; 2) relationships between training load indices and changes in neuromuscular physical performance. METHODS: Prior to and following the preparation period, players underwent a counter-movement jump (CMJ) test, followed by a repeated change of direction (COD) test consisting of 4 levels with increasing intensities...
January 18, 2018: International Journal of Sports Physiology and Performance
Ángel L Santiago-Díaz, Julisa García-Albortante, Mónica L Salazar-Peláez
The aim of this work was to evaluate the performance of a UASB-septic tank as a decentralized treatment of high strength municipal wastewater, under two different HRTs (48 and 72h). Thus, a lab scale (44.85L) UASB-septic tank constituted by three compartments was operated under HRT 72h and 48h. Removal efficiencies of total COD, BOD5 and suspended solids ranged from 60% to 80% for the first two parameters and from 70% to 90% for the last one. According to the statistical analysis, it was established that decreasing HRT from 72h to 48h did not affect the performance of the UASB-septic tank; therefore, the latter HRT is recommended to be used for operation...
January 18, 2018: Environmental Technology
Elsie M Sunderland, Miling Li, Kurt Bullard
BACKGROUND: Methylmercury (MeHg) exposure is associated with adverse effects on neurodevelopment and cardiovascular health. Previous work indicates most MeHg is from marine fish sold in the commercial market, but does not fully resolve supply regions globally. This information is critical for linking changes in environmental MeHg levels to human exposure in the U.S. population. OBJECTIVES: We used available data to estimate the geographic origins of seafood consumed in the United States (major ocean basins, coastal fisheries, aquaculture, freshwater) and how shifts in edible supply affected MeHg exposures between 2000-2002 and 2010-2012...
January 16, 2018: Environmental Health Perspectives
Carleen Cullinane, Glen B Deacon, Penny R Drago, Anja P Erven, Peter C Junk, Jenny Luu, Gerd Meyer, Simon Schmitz, Ingo Ott, Julia Schur, Lorraine K Webster, Axel Klein
New organometallic complexes [M(dppe)(R)2] {where M = Pt or Pd, dppe = 1,2-bis(diphenylphosphano)ethane, and R = C6F4H-x (x = 6,5,4), C6F3H2-3,5, C6F3H2-5,6, C6F3H2-3,6, C6F4(OMe)-4, and C6F4(cyclo-C5H10N)-4, the numbers x refer to the positions of the protons in the polyfluoroaryl ligands} were synthesised either through transmetalation from the dichlorido complexes [M(dppe)Cl2] or through ligand exchange using [M(diene)Cl2] precursor complexes with diene = 1,5-cyclooctadiene (cod) or 1,5-hexadiene (hex). Alternatively, [M(dppX)Cl(R)] complexes with dppX = dppm (1,1-bis(diphenylphosphano)methane), dppe, dppp (1,3-bis(diphenylphosphano)propane), and dppb (1,4-bis(diphenylphosphano)butane) were prepared in decarboxylation reactions from thallium(i) carboxylates Tl(O2CR)...
January 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Mehtap Tanyol, Aysenur Ogedey, Ensar Oguz
This study examines the removal of chemical oxygen demand (COD) from landfill leachate generated from the municipal landfill site of Bingol, Turkey. The effect of parameters such as current density, pH, and inter-electrode distance during the electrocoagulation (EC) process on COD removal of the process was investigated. Moreover, for COD removal, the energy consumption and operating costs were calculated for iron electrode under the EC conditions. COD removal efficiency was 72.13% at the current density of 16 mA m-2, pH of 8...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Yanjun Mao, Xie Quan, Huimin Zhao, Yaobin Zhang, Shuo Chen, Tao Liu
The activated sludge (AS) process is widely applied in dyestuff wastewater treatment plants (WWTPs); however, the nitrogen removal efficiency is relatively low and the effluent does not meet the indirect discharge standards before being discharged into the industrial park's WWTP. Hence it is necessary to upgrade the WWTP with more advanced technologies. Moving bed biofilm processes with suspended carriers in an aerobic tank are promising methods due to enhanced nitrification and denitrification. Herein, a pilot-scale integrated free-floating biofilm and activated sludge (IFFAS) process was employed to investigate the feasibility of enhancing nitrogen removal efficiency at different hydraulic retention times (HRTs)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
T Pérez-Pérez, I Pereda-Reyes, E Pozzi, D Oliva-Merencio, M Zaiat
This paper shows the effect of organic shock loads (OSLs) on the anaerobic digestion (AD) of synthetic swine wastewater using an expanded granular sludge bed (EGSB) reactor modified with zeolite. Two reactors (R1 and R2), each with an effective volume of 3.04 L, were operated for 180 days at a controlled temperature of 30 °C and hydraulic retention time of 12 h. In the case of R2, 120 g of zeolite was added. The reactors were operated with an up-flow velocity of 6 m/h. The evolution of pH, total Kjeldahl nitrogen, chemical oxygen demand (COD) and volatile fatty acids (VFAs) was monitored during the AD process with OSL and increases in the organic loading rate (OLR)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
I V K Nayanthika, D T Jayawardana, N J G J Bandara, P M Manage, R M T D Madushanka
Landfill leachate poses environmental threats worldwide and causes severe issues on adjacent water bodies and soil by direct discharge. The primary objective of this study is to analyze the efficient use of compost and laterite mixtures (0, 10, 20, 30 and 40 wt% compost/laterite) on leachate treatment and to investigate the associated removal efficiencies under different sorption processes. Therefore, in the experimental design, laterite is used for providing adsorption characteristics, and compost for activating biological properties of the filter...
January 11, 2018: Waste Management
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