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https://www.readbyqxmd.com/read/28728975/continuous-nitrogen-removal-by-a-single-stage-reactor-packed-with-ring-laced-string-medium
#1
Masahiro Tatara, Shu Ishikawa, Yoshiyuki Ueno
The efficiency of nitrogen removal by a partial-nitritation/anammox (PNA) reaction was investigated using a packed-bed reactor in which ring-laced strings were used as the supporting medium. A stable population of PNA microorganisms was established from typical activated sludge, after less than two months of acclimation in the packed-bed reactor, by applying a high nitrogen-loading rate (NLR: 0.53 kg/m(3)/d) and short hydraulic retention time (HRT: 1.8 h). The stability of reactor performance was confirmed in industrial wastewater (IW), demonstrating a nitrogen removal efficiency (NRE) of greater than 77% during 260 days of continuous operation, between 0...
July 17, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28727836/the-disc-damage-likelihood-scale-diagnostic-accuracy-and-correlations-with-cup-to-disc-ratio-structural-tests-and-standard-automated-perimetry
#2
Andrea C Kara-José, Luiz Alberto S Melo, Bruno L B Esporcatte, Angelica T N H Endo, Mauro Toledo Leite, Ivan Maynart Tavares
Our objective was to compare the diagnostic accuracies of and to determine the correlations between the disc damage likelihood scale (DDLS) and anatomical and functional tests used for glaucoma detection. A total of 54 healthy subjects (54 eyes) and 47 primary open-angle glaucoma patients (47 eyes) were included in this cross-sectional observational study. DDLS scores and cup-to-disc (C/D) ratios were evaluated. Subjects underwent standard automated perimetry (SAP), optic disc and retinal nerve fiber layer (RNFL) imaging with time and spectral-domain optical coherence tomography (TD and SD-OCT), Heidelberg Retina Tomograph (HRT II), and scanning laser polarimetry (GDx-VCC)...
2017: PloS One
https://www.readbyqxmd.com/read/28724252/effect-of-operating-conditions-on-speciation-and-bioavailability-of-trace-metals-in-submerged-anaerobic-membrane-bioreactors
#3
Pham Minh Thanh, Balachandran Ketheesan, Yan Zhou, David C Stuckey
This study investigated the effect of changes in pH (7, 6.5 and 6), hydraulic retention time (HRT) (6h, 4h, and 2h), solids retention time (SRT) (100d and 25d) on the speciation of trace metals (TMs) in submerged anaerobic membrane bioreactors (SAMBRs). The results showed that the metal retention capacity of SAMBRs reduced when the pH, HRT and SRT were reduced i.e. up to 21.9%, 39.1%, and 17.1%, respectively, but it was also found that the speciation of these TMs generally shifted towards highly bioavailable fractions i...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28712782/cu-removal-and-response-mechanisms-of-periphytic-biofilms-in-a-tubular-bioreactor
#4
Lan Ma, Fengwu Wang, Yuanchun Yu, Junzhuo Liu, Yonghong Wu
This work studied Cu removal and response mechanisms of periphytic biofilms in a tubular bioreactor. Periphytic biofilms immobilized in a tubular bioreactor were used to remove Cu from wastewater with different Cu concentrations. Results showed that periphytic biofilms had a high removal efficiency (max. 99%) at a hydraulic retention time (HRT) of 12h under initial Cu concentrations of 2.0 and 10.0mgL(-1). Periphyton quickly adapted to Cu stress by regulating the community composition. Species richness, evenness and carbon metabolic diversity of the periphytic community increased when exposed to Cu...
July 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28712332/comparison-of-commercial-baker-s-yeast-versus-bacteria-based-membrane-bioreactors-for-landfill-leachate-treatment
#5
M C S Amaral, G C B Brito, B G Reis, L C Lange, W G Moravia
This paper compares the performance of the membrane bioreactor (MBR) inoculated with commercial baker's yeast (Saccharomyces cerevisiae) (MBRy) versus one inoculated with bacterial sludge (MBRb) for treatment of landfill leachate (LFL). The MBRb and MBRy were operated with a hydraulic retention time (HRT) of 48 h, solids retention time (SRT) of 60 d, and specific air demand based on membrane area (SADm) of 0.6 m(3) h(-1) m(-2). The MBRy was more efficient in removing COD (68 ± 12%), color (79 ± 8%), ammoniacal nitrogen (58 ± 18%), and phosphorus (62 ± 19%) compared to MBRb, which showed removal efficiencies of 44 ± 18%, 46 ± 20%, 45 ± 17%, and 29 ± 15% for COD, color, ammoniacal nitrogen, and phosphorus...
July 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28711803/investigation-on-the-response-of-anaerobic-membrane-bioreactor-to-temperature-decrease-from-25%C3%A2-c-to-10%C3%A2-c-in-sewage-treatment
#6
Ryoya Watanabe, Yulun Nie, Shinichiro Wakahara, Daisuke Komori, Yu-You Li
Anaerobic membrane bioreactor (AnMBR) for sewage treatment was operated for 650days with the decrease of temperature from 25°C to 10°C. At higher temperature >15°C, COD removal was above 94% while sewage treatment efficiency and relevant CH4 production decreased below 15°C. The effluent COD at 10°C was 134mg/L at HRT of 16h. Moreover, low temperature can result in a higher membrane fouling rate due to the microbial self-protection behavior in coping with the temperature decrease by releasing soluble microbial products (SMP) and extracellular polymeric substances (EPS)...
July 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28709740/effects-of-size-and-thermophilic-pre-hydrolysis-of-banana-peel-during-anaerobic-digestion-and-biomethanation-potential-of-key-tropical-fruit-wastes
#7
Mary Jesuyemi Odedina, Boonya Charnnok, Kanyarat Saritpongteeraka, Sumate Chaiprapat
Methane production potential of tropical fruit wastes, namely lady-finger banana peel, rambutan waste and longan waste were compared using BMP assay and stoichiometric modified Buswell and Mueller equation. Methane yields based on volatile solid (VS) were in the order of ground banana peel, chopped banana peel, chopped longan waste, and chopped rambutan waste (330.6, 268.3, 234.6 and 193.2 mLCH4/gVS) that corresponded to their calculated biodegradability. In continuous operations of banana peel digestion at feed concentrations based on total solid (TS) 1-2%, mesophilic single stage digester run at 20-day hydraulic retention time (20-day HRT) failed at 2%TS, but successfully recovered at 1...
July 11, 2017: Waste Management
https://www.readbyqxmd.com/read/28707400/hormone-factors-play-a-favorable-role-in-female-head-and-neck-cancer-risk
#8
Dana Hashim, Samantha Sartori, Carlo La Vecchia, Diego Serraino, Luigino Dal Maso, Eva Negri, Elaine Smith, Fabio Levi, Stefania Boccia, Gabriella Cadoni, Hung N Luu, Yuan-Chin Amy Lee, Mia Hashibe, Paolo Boffetta
Due to lower female incidence, estimates of exogenous and endogenous hormonal factors in head and neck cancers (HNCs, comprising cancers of the oral cavity, oropharynx, hypopharynx, and larynx) among women have been inconsistent and unable to account for key HNC risk factors. We pooled data from 11 studies from Europe, North America, and Japan. Analysis included 1572 HNC female cases and 4343 controls. Pooled odds ratios (ORs) estimates and their 95% confidence intervals (CIs) were calculated using multivariate logistic regression models adjusting for tobacco smoking and alcohol drinking...
July 14, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28705605/age-of-menarche-is-associated-with-knee-joint-replacement-due-to-primary-osteoarthritis-the-hunt-study-and-the-norwegian-arthroplasty-register
#9
A I Hellevik, L Nordsletten, M B Johnsen, A M Fenstad, O Furnes, K Storheim, J A Zwart, G Flugsrud, A Langhammer
OBJECTIVE: To investigate whether parity, age at menarche, menopausal status, age at menopause, use of oral contraceptives (OC) or use of hormone replacement therapy (HRT) were associated with total knee replacement (TKR) or total hip replacement (THR) due to primary osteoarthritis. METHOD: In a prospective cohort study of 30,289 women from the second and third surveys of the Nord-Trøndelag Health Study, data were linked to the Norwegian Arthroplasty Register (NAR) in order to identify TKR or THR due to primary osteoarthritis...
July 10, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28698314/association-of-perceived-tinnitus-with-duration-of-hormone-replacement-therapy-in-korean-postmenopausal-women-a-cross-sectional-study
#10
Seong-Su Lee, Kyung-do Han, Young-Hoon Joo
OBJECTIVE: The purpose of this study was to determine the relationship between hormone replacement therapy (HRT) and tinnitus in South Korea using data from the Korea National Health and Nutrition Examination Surveys (KNHANES) (2010-2012). STUDY DESIGN: Cross-sectional analysis of a nationwide health survey. METHODS: KNHANES is a nationally representative cross-sectional survey of South Korea population. Only postmenopausal women aged 19-65 years were included in the study (n=2736)...
July 10, 2017: BMJ Open
https://www.readbyqxmd.com/read/28697457/bio-immobilization-of-dark-fermentative-bacteria-for-enhancing-continuous-hydrogen-production-from-cornstalk-hydrolysate
#11
Lei Zhao, Guang-Li Cao, Tao Sheng, Hong-Yu Ren, Ai-Jie Wang, Jian Zhang, Ying-Juan Zhong, Nan-Qi Ren
Mycelia pellets were employed as biological carrier in a continuous stirred tank reactor to reduce biomass washout and enhance hydrogen production from cornstalk hydrolysate. Hydraulic retention time (HRT) and influent substrate concentration played critical roles on hydrogen production of the bioreactor. The maximum hydrogen production rate of 14.2mmol H2L(-1)h(-1) was obtained at optimized HRT of 6h and influent concentration of 20g/L, 2.6 times higher than the counterpart without mycelia pellets. With excellent immobilization ability, biomass accumulated in the reactor and reached 1...
June 30, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28691549/factors-associated-with-complementary-and-alternative-medicine-use-among-women-at-midlife
#12
C Costanian, R A G Christensen, H Edgell, C I Ardern, H Tamim
Hormone replacement therapy (HRT) has been established as the first-line treatment for women experiencing menopausal symptoms. The use of complementary and alternative medicine (CAM), however, is becoming increasingly popular among women at midlife for management of such symptoms. Despite the equivocal evidence of CAM's efficacy in the reduction and alleviation of menopausal symptoms in placebo-controlled, randomized trials, 50% of women at midlife use CAM. To date, several large, population-based studies have focused upon CAM use amongst menopausal women and the factors associated with the adoption of such therapies...
July 8, 2017: Climacteric: the Journal of the International Menopause Society
https://www.readbyqxmd.com/read/28689118/prenatal-and-postnatal-exposure-to-no2-and-child-attentional-function-at-4-5years-of-age
#13
Alexis Sentís, Jordi Sunyer, Albert Dalmau-Bueno, Ainara Andiarena, Ferran Ballester, Marta Cirach, Marisa Estarlich, Ana Fernández-Somoano, Jesús Ibarluzea, Carmen Íñiguez, Aitana Lertxundi, Adonina Tardón, Mark Nieuwenhuijsen, Martine Vrijheid, Mònica Guxens
BACKGROUND: Prenatal and postnatal exposure to air pollution has been linked to cognitive impairment in children, but very few studies have assessed its association with attentional function. OBJECTIVES: To evaluate the association between prenatal and postnatal exposure to nitrogen dioxide (NO2) and attentional function in children at 4-5years of age. METHODS: We used data from four regions of the Spanish INMA-Environment and Childhood-Project, a population-based birth cohort...
July 6, 2017: Environment International
https://www.readbyqxmd.com/read/28689107/feasibility-of-thermophilic-anaerobic-processes-for-treating-waste-activated-sludge-under-low-hrt-and-intermittent-mixing
#14
Wanderli Leite, Bruna Scandolara Magnus, Lorena Bittencourt Guimarães, Marco Gottardo, Paulo Belli Filho
Thermophilic anaerobic digestion (AD) arises as an optimized solution for the waste activated sludge (WAS) management. However, there are few feasibility studies using low solids content typically found in the WAS, and that consider uncommon operational conditions such as intermittent mixing and low hydraulic retention time (HRT). In this investigation, a single-stage pilot reactor was used to treat WAS at low HRT (13, 9, 6 and 5 days) and intermittent mixing (withholding mixing 2 h prior feeding). Thermophilic anaerobic digestion (55 °C) was initiated from a mesophilic digester (35 °C) by the one-step startup strategy...
July 6, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28686536/dietary-protein-intake-above-the-current-rda-and-bone-health-a-systematic-review-and-meta-analysis
#15
Taylor C Wallace, Cara L Frankenfeld
Dietary intake of protein is fundamental for optimal acquisition and maintenance of bone across all life stages; however, it has been hypothesized that intakes above the current recommended dietary allowance (RDA) might be beneficial for bone health. We utilized the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines when preparing and reporting this systematic review and meta-analysis. A literature search strategy through April 11, 2017, was developed for the following 3 databases: PubMed, Ovid Medline, and Agricola...
July 7, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28683479/-diagnostic-precision-of-the-confocal-scanning-laser-ophthalmoscopy-in-the-large-optic-disc-with-physiological-excavation-a-long-term-study
#16
Eva Charlotte Koch, Niklas Plange, Matthias Fuest, Hannah Schimitzek, David Kuerten
We repeatedly examined 17 subjects with presumed bilateral physiological excavation labeled as pathological and/or borderline via HRT to verify the diagnosis of physiological cupping or to monitor the long-term progression into normal tension glaucoma. Patients and Methods 17 Subjects with presumed bilateral physiological cupping and large optic discs were included in this long-term follow-up study. All subjects underwent regular detailed ophthalmologic examinations, including intraocular pressure measurement via Goldmann applanation tonometry (GAT), retinal nerve fiber layer imaging via optical coherence tonometry (OCT) and visual field testing and optic disc imaging using the HRT...
July 6, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28678331/impact-of-postoperative-pituitary-tumor-adrenal-insufficiency-and-hormone-replacement-therapy-hrt-on-tumor-recurrence
#17
G-X Wei, S-L Wang, L Zhang, Y-Q Ma, H-S Xing
OBJECTIVE: The present study was aimed to investigate the impact of postoperative pituitary tumor adrenal insufficiency and hormone replacement therapy (HRT) on tumor recurrence. PATIENTS AND METHODS: The prospective study included 143 pituitary tumor patients as study subjects. Within 6 months after the operation, the study was planned to explore differences (if any) between the tumor recurrence rate of patients treated with hormone replacement therapy and the patients without hormone replacement therapy...
June 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28666149/phosphorus-removal-performance-and-biological-dephosphorization-process-in-treating-reclaimed-water-by-integrated-vertical-flow-constructed-wetlands-ivcws
#18
Lu Du, Qianru Chen, Panpan Liu, Xia Zhang, Huihui Wang, Qiaohong Zhou, Dong Xu, Zhenbin Wu
Phosphorous removal in adsorption had been extensively researched; however, the biological dephosphorization process and optimum operating parameters have not been discussed or quantified in Integrated Vertical-flow Constructed Wetlands (IVCWs). In this study, IVCWs planted with different plants were employed to evaluate total phosphorus (TP) treatment performance under different hydraulic retention times (HRTs), in summer and autumn. The results showed that the systems planted with Canna generalis showed the highest TP removal efficiency (77%) under a three-day HRT in autumn...
June 19, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28661404/theory-and-computer-simulation-of-hard-core-yukawa-mixtures-thermodynamical-structural-and-phase-coexistence-properties
#19
Anele Mkanya, Giuseppe Pellicane, Davide Pini, Carlo Caccamo
We report extensive calculations, based on the modified hypernetted chain (MHNC) theory, on the hierarchical reference theory (HRT), and on Monte Carlo simulations, of thermodynamical, structural and phase coexistence properties of symmetric binary hard-core Yukawa mixtures (HCYM) with attractive interactions at equal species concentration. The obtained results are throughout compared with those available in the literature for the same systems. It turns out that the MHNC predictions for thermodynamic and structural quantities are quite accurate in comparison to the MC data...
June 29, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28661325/upflow-anaerobic-sludge-blanket-reactor-codigestion-of-algae-and-acetate-to-produce-methane
#20
Yousef M Soboh, Darwin L Sorensen, Ronald C Sims
  Algae grown in wastewater treatment lagoons are a potentially important substrate for biofuel production. The feasibility of using upflow anaerobic sludge blanket (UASB) reactors in anaerobic digestion of algae to produce methane was investigated. A favorable carbon to nitrogen (C/N) weight ratio of 21/1 was determined in batch reactor experiments in which the ratio was adjusted by blending algal biomass with sodium acetate as a carbon source. This blend of algae and acetate was used in the feedstock applied to the UASB reactors...
November 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
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