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https://www.readbyqxmd.com/read/28324850/sludge-management-modeling-to-enhance-p-recovery-as-struvite-in-wastewater-treatment-plants
#1
N Martí, R Barat, A Seco, L Pastor, A Bouzas
Interest in phosphorus (P) recovery and reuse has increased in recent years as supplies of P are declining. After use, most of the P remains in wastewater, making Wastewater Treatment Plants (WWTPs) a vital part of P recycling. In this work, a new sludge management operation was studied by modeling in order to recover P in the form of struvite and minimize operating problems due to uncontrolled P precipitation in WWTPs. During the study, intensive analytical campaigns were carried out on the water and sludge lines...
March 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28324827/anaerobic-treatment-of-hydrothermally-solubilised-sugarcane-bagasse-and-its-kinetic-modelling
#2
Bing Liu, Van Anh Ngo, Mitsuharu Terashima, Hidenari Yasui
The aim of this study was the evaluation of anaerobic treatment for the soluble organics generated from a steam-explosion pre-treatment of sugarcane bagasse. The batch analysis revealed that about 50% of the organics was possible to be degraded into methane whilst the rest was biologically inert and composed of mostly lignin. Based on the experiment a kinetic model composed of 14 kinds of soluble substances and 5 kinds of anaerobic microorganisms was developed. The model was used to simulate the process performance of a continuous anaerobic bioreactor with MLSS concentration at 2500-15,000mg/L...
March 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28324710/dual-substrate-limitation-modeling-and-implications-for-mainstream-deammonification
#3
Heather A Stewart, Ahmed Al-Omari, Charles Bott, Haydee De Clippeleir, Chunyang Su, Imre Takacs, Bernhard Wett, Arash Massoudieh, Sudhir Murthy
Substrate limitation occurs frequently in wastewater treatment and knowledge about microbial behavior at limiting conditions is essential for the use of biokinetic models in system design and optimization. Monod kinetics are well-accepted for modeling growth rates when a single substrate is limiting, but several models exist for treating two or more limiting substrates simultaneously. In this study three dual limitation models (multiplicative, minimum, and Bertolazzi) were compared based on experiments using nitrite-oxidizing bacteria (limited by dissolved oxygen and nitrite) and ANaerobic AMMonia-OXidizing bacteria or Aanammox (limited by ammonium and nitrite) within mixed liquor from deammonification pilots...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28323833/lactate-dehydrogenase-in-toxoplasma-gondii-controls-virulence-bradyzoite-differentiation-and-chronic-infection
#4
Abdelbaset E Abdelbaset, Barbara A Fox, Mohamed H Karram, Mahmoud R Abd Ellah, David J Bzik, Makoto Igarashi
In the asexual stages, Toxoplasma gondii stage converts between acute phase rapidly replicating tachyzoites and chronic phase slowly dividing bradyzoites. Correspondingly, T. gondii differentially expresses two distinct genes and isoforms of the lactate dehydrogenase enzyme, expressing LDH1 exclusively in the tachyzoite stage and LDH2 preferentially in the bradyzoite stage. LDH catalyzes the interconversion of pyruvate and lactate in anaerobic growth conditions and is utilized for energy supply, however, the precise role of LDH1 and LDH2 in parasite biology in the asexual stages is still unclear...
2017: PloS One
https://www.readbyqxmd.com/read/28323452/how-to-manage-plant-biomass-originated-from-phytotechnologies-gathering-perceptions-from-end-users
#5
V Bert, S Neu, I Zdanevitch, W Friesl-Hanl, S Collet, R Gaucher, M Puschenreiter, I Müller, J Kumpiene
A questionnaire survey was carried out in 4 European countries to gather end-user's perceptions of using plants from phytotechnologies in combustion and anaerobic digestion (AD). 9 actors of the wood energy sector from France, Germany and Sweden, and 11 AD platform operators from France, Germany and Austria were interviewed. Questions related to installation, input materials, performed analyses, phytostabilization and phytoextraction. Although the majority of respondents did not know phytotechnologies, results suggested that plant biomass from phytomanaged areas could be used in AD and combustion, under certain conditions...
March 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28320052/soft-tissue-infections-from-fish-spike-wounds-normal-commensal-bacteria-are-more-common-than-marine-pathogens
#6
Hannah Collins, Kin Mun Lee, Paul T-Y Cheng, Sarah Hulme
BACKGROUND: A fish spike injury can be sustained by anyone handling fish; during fishing, meal preparation or in retail. Case reports of fish spikes inoculating victims with virulent marine-specific pathogens and causing systemic illness led us to question whether empirical treatment of these injuries with amoxicillin and clavulanic acid is adequate. METHODS: This 2-year prospective observational study was conducted at Middlemore Hospital, Auckland, New Zealand...
March 20, 2017: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/28319901/a-novel-microbial-fuel-cell-sensor-with-biocathode-sensing-element
#7
Yong Jiang, Peng Liang, Panpan Liu, Donglin Wang, Bo Miao, Xia Huang
The traditional microbial fuel cell (MFC) sensor with bioanode as sensing element delivers limited sensitivity to toxicity monitoring, restricted application to only anaerobic and organic rich water body, and increased potential fault warning to the combined shock of organic matter/toxicity. In this study, the biocathode for oxygen reduction reaction was employed for the first time as the sensing element in MFC sensor for toxicity monitoring. The results shown that the sensitivity of MFC sensor with biocathode sensing element (7...
March 2, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28319775/dilute-alkali-pretreatment-of-softwood-pine-a-biorefinery-approach
#8
Ali Safari, Keikhosro Karimi, Marzieh Shafiei
Dilute alkali pretreatment was performed on softwood pine to maximize ethanol and biogas production via a biorefinery approach. Alkali pretreatments were performed with 0-2% w/v NaOH at 100-180°C for 1-5h. The liquid fraction of the pretreated substrates was subjected to anaerobic digestion. The solid fraction of the pretreatment was used for separate enzymatic hydrolysis and fermentation. High ethanol yields of 76.9‒78.0% were achieved by pretreatment with 2% (w/v) NaOH at 180°C. The highest biogas yield of 244mL/g volatile solid (at 25°C, 1bar) was achieved by the pretreatment with 1% (w/v) NaOH at 180°C...
March 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319770/mechanisms-and-effects-of-arsanilic-acid-on-antibiotic-resistance-genes-and-microbial-communities-during-pig-manure-digestion
#9
Wei Sun, Xun Qian, Jie Gu, Xiao-Juan Wang, Li Zhang, Ai-Yun Guo
High concentrations of residual arsanilic acid occur in pig manure due to its use in feed to promote growth and control diseases. This study compared the effects of arsanilic acid at three concentrations (0, 325, and 650mg/kg dry pig manure) on the abundance of antibiotic resistance genes (ARGs) and the microbial community during anaerobic digestion. Addition of 650mg/kg arsanilic acid enhanced the absolute abundances of tetC, sul2, ermB, and gyrA more than twofold in the digestion product. Redundancy analysis indicated that the change in the microbial community structure was the main driver of variation in the ARGs profile...
March 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319766/sequential-ultrasound-and-low-temperature-thermal-pretreatment-process-optimization-and-influence-on-sewage-sludge-solubilization-enzyme-activity-and-anaerobic-digestion
#10
Patricio Neumann, Zenón González, Gladys Vidal
The influence of sequential ultrasound and low-temperature (55°C) thermal pretreatment on sewage sludge solubilization, enzyme activity and anaerobic digestion was assessed. The pretreatment led to significant increases of 427-1030% and 230-674% in the soluble concentrations of carbohydrates and proteins, respectively, and 1.6-4.3 times higher enzymatic activities in the soluble phase of the sludge. Optimal conditions for chemical oxygen demand solubilization were determined at 59.3kg/L total solids (TS) concentration, 30,500kJ/kg TS specific energy and 13h thermal treatment time using response surface methodology...
March 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319759/removal-of-hydrogen-sulfide-generated-during-anaerobic-treatment-of-sulfate-laden-wastewater-using-biochar-evaluation-of-efficiency-and-mechanisms
#11
Jarupat Kanjanarong, Balendu S Giri, Deb P Jaisi, Fernanda R Oliveira, Piyarat Boonsawang, Sumate Chaiprapat, R S Singh, Avula Balakrishna, Samir Kumar Khanal
Removal of hydrogen sulfide (H2S) from biogas was investigated in a biochar column integrated with a bench-scale continuous-stirred tank reactor (CSTR) treating sulfate-laden wastewater. Synthetic wastewater containing sulfate concentrations of 200-2000mg SO4(2-)/L was used as substrate, and the CSTR was operated at an organic loading rate of 1.5g chemical oxygen demand (COD)/L·day and a hydraulic retention time (HRT) of 20days. The biochar was able to remove about 98.0 (±1.2)% of H2S for the ranges of concentrations from 105-1020ppmv, especially at high moisture content (80-85%)...
March 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319758/trace-metals-supplementation-in-anaerobic-membrane-bioreactors-treating-highly-saline-phenolic-wastewater
#12
Julian David Muñoz Sierra, Carlos Lafita, Carmen Gabaldón, Henri Spanjers, Jules B van Lier
Biomass requires trace metals (TM) for maintaining its growth and activity. This study aimed to determine the effect of TM supplementation and partitioning on the specific methanogenic activity (SMA), with a focus on cobalt and tungsten, during the start-up of two lab-scale Anaerobic Membrane Bioreactors (AnMBRs) treating saline phenolic wastewater. The TM partitioning revealed a strong accumulation of sodium in the biomass matrix and a wash-out of the majority of TM in the reactors, which led to an SMA decrease and a low COD removal of about 30%...
March 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319707/treatment-of-anaerobic-digested-effluent-in-biochar-packed-vertical-flow-constructed-wetland-columns-role-of-media-and-tidal-operation
#13
Simon Kizito, Tao Lv, Shubiao Wu, Zeeshan Ajmal, Hongzhen Luo, Renjie Dong
Three types of vertical flow constructed wetland columns (VFCWs), packed with corn cob biochar (CB-CW), wood biochar (WB-CW) and gravel (G-CW) under tidal flow operations, were comparatively evaluated to investigate anaerobic digested effluent treatment performance and mechanisms. It was demonstrated that CB-CW and WB-CW provide significantly higher removal efficiencies for organic matter (>59%), NH4(+)-N (>76%), TN (>37%) and phosphorus (>71%), compared with G-CW (22%-49%). The higher pollutants removal ability of biochar-packed VFCWs was mainly attribute to the higher adsorption ability and microbial cultivation in the porous biochar media...
March 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318963/an-investigation-of-ultrasound-effect-on-digestate-solubilization-and-methane-yield
#14
Temesgen Garoma, David Pappaterra
In this study, different ultrasound power intensities of 0.05-0.21kW/L (4.13-16.52kWh/kg TS) were applied at a frequency of 20kHz and for durations of 5-20min to digestate obtained from a domestic wastewater treatment plant. The ultrasonic effect on digestate solubilization was revealed by increased levels of soluble Chemical Oxygen Demand (sCOD), soluble Total Organic Carbon (sTOC), and soluble Total Nitrogen (sTN) released into the solution. The highest material release was achieved at an ultrasonic energy intensity of 0...
March 16, 2017: Waste Management
https://www.readbyqxmd.com/read/28318934/performance-evaluation-of-the-pilot-scale-upflow-anaerobic-sludge-blanket-downflow-hanging-sponge-system-for-natural-rubber-processing-wastewater-treatment-in-south-vietnam
#15
Takahiro Watari, Trung Cuong Mai, Daisuke Tanikawa, Yuga Hirakata, Masashi Hatamoto, Kazuaki Syutsubo, Masao Fukuda, Ngoc Bich Nguyen, Takashi Yamaguchi
A pilot-scale upflow anaerobic sludge blanket (UASB)-downflow hanging sponge system (DHS) combined with an anaerobic baffled reactor (ABR) and a settling tank (ST) was installed in a natural rubber processing factory in South Vietnam and its process performance was evaluated for 267days. The UASB reactor achieved a total removal efficiency of 55.6±16.6% for chemical oxygen demand (COD) and 77.8±10.3% for biochemical oxygen demand (BOD) with an organic loading rate of 1.7±0.6kg-COD·m(-3)·day(-1). The final effluent of the proposed system had 140±64mg·L(-1) of total COD, 31±12mg·L(-1) of total BOD, and 58±24mg-N·L(-1) of total nitrogen...
March 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28318933/anaerobic-oxidation-of-methane-coupled-to-thiosulfate-reduction-in-a-biotrickling-filter
#16
Chiara Cassarini, Eldon R Rene, Susma Bhattarai, Giovanni Esposito, Piet N L Lens
Microorganisms from an anaerobic methane oxidizing sediment were enriched with methane gas as the substrate in a biotrickling filter (BTF) using thiosulfate as electron acceptor for 213days. Thiosulfate disproportionation to sulfate and sulfide were the dominating sulfur conversion process in the BTF and the sulfide production rate was 0.5mmoll(-1)day(-1). A specific group of sulfate reducing bacteria (SRB), belonging to the Desulforsarcina/Desulfococcus group, was enriched in the BTF. The BTF biomass showed maximum sulfate reduction rate (0...
March 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28317859/physiological-and-transcriptional-approaches-reveal-connection-between-nitrogen-and-manganese-cycles-in-shewanella-algae-c6g3
#17
Axel Aigle, Patricia Bonin, Chantal Iobbi-Nivol, Vincent Méjean, Valérie Michotey
To explain anaerobic nitrite/nitrate production at the expense of ammonium mediated by manganese oxide (Mn(IV)) in sediment, nitrate and manganese respirations were investigated in a strain (Shewanella algae C6G3) presenting these features. In contrast to S. oneidensis MR-1, a biotic transitory nitrite accumulation at the expense of ammonium was observed in S. algae during anaerobic growth with Mn(IV) under condition of limiting electron acceptor, concomitantly, with a higher electron donor stoichiometry than expected...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317564/odontogenic-infections
#18
REVIEW
Orrett E Ogle
The pathogenesis of odontogenic infection is polymicrobial, consisting of various facultative and strict anaerobes. The dominant isolates are strictly anaerobic gram-negative rods and gram-positive cocci. The periapical infection is the most common form of odontogenic infection. Although odontogenic infections are usually confined to the alveolar ridge vicinity, they can spread into deep fascial spaces. Cavernous sinus thrombosis, brain abscess, airway obstruction, and mediastinitis are possible complications of dental infections...
April 2017: Dental Clinics of North America
https://www.readbyqxmd.com/read/28317451/inclusion-of-saccharina-latissima-in-conventional-anaerobic-digestion-systems
#19
F Ometto, A Berg, A Björn, L Safaric, B H Svensson, A Karlsson, J Ejlertsson
Loading macroalgae into existing anaerobic digestion (AD) plants allows us to overcome challenges such as low digestion efficiencies, trace elements limitation, excessive salinity levels and accumulation of volatile fatty acids (VFAs), observed while digesting algae as a single substrate. In this work, the co-digestion of the brown macroalgae Saccharina latissima with mixed municipal wastewater sludge (WWS) was investigated in mesophilic and thermophilic conditions. The hydraulic retention time (HRT) and the organic loading rate (OLR) were fixed at 19 days and 2...
March 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28317444/development-of-a-high-rate-submerged-anaerobic-membrane-bioreactor-sanmbr
#20
I Mahmoud, W J Gao, B Q Liao, J Cumin, M Dagnew, Y Hong
Typically, anaerobic membrane bioreactors are operated at an organic loading rate (OLR) less than 10 kg COD/m(3)d. This paper discusses the development and performance of a high-rate submerged anaerobic membrane bioreactor (SAnMBR) for a high strength synthetic industrial wastewater treatment. An organic loading rate (OLR) as high as 41 kg COD/m(3).d was achieved with excellent COD removal efficiency (>99%). The membrane was operated at constant fluxes (9.4-9.9 ± 0.5 L/m(2).h) and the change in trans-membrane pressure was monitored to characterize the membrane performance...
March 18, 2017: Environmental Technology
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