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https://www.readbyqxmd.com/read/28812881/predicting-microbial-fuel-cell-biofilm-communities-and-bioreactor-performance-using-artificial-neural-networks
#1
Keaton Larson Lesnik, Hong Liu
The complex interactions that occur in mixed-species bioelectrochemical reactors, like microbial fuel cells (MFCs), make accurate predictions of performance outcomes under untested conditions difficult. While direct correlations between any individual waste stream characteristic or microbial community structure and reactor performance have not been able to be directly established, the increase in sequencing data and readily available computational power enables the development of alternate approaches. In the current study, 33 MFCs were evaluated under a range of conditions including 8 separate substrates and 3 different wastewaters...
August 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28812288/effect-of-step-feeding-on-the-performance-of-lab-scale-columns-simulating-vertical-flow-horizontal-flow-constructed-wetlands
#2
Verónica Torrijos, Isabel Ruiz, Manuel Soto
The effect of step-feeding (untreated wastewater by-pass) on the performance of lab-scale columns simulating a hybrid vertical flow (VF)-horizontal flow (HF) constructed wetland (CW) system was studied. Step-feeding strategies have been adopted in several kinds of CW, but this is the first report about the use of step-feeding in VF + HF hybrid systems treating domestic wastewater. Applied loading rates were 7-11 g BOD5/m(2) day and 2.1-3.4 g TN/m(2) day (overall system). Removal efficiency reached 98% TSS and COD and 99% BOD5 on average, whilst a 50% by-pass improved TN removal from 31 to 50%...
August 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28811146/n2o-emissions-from-an-intermittently-aerated-semi-aerobic-aged-refuse-bioreactor-combined-effect-of-cod-and-nh4-n-in-influent-leachate
#3
Weihua Li, Yingjie Sun, Rongxing Bian, Huawei Wang, Dalei Zhang
The carbon-nitrogen ratio (COD/NH4(+)-N) is an important factor affecting nitrification and denitrification in wastewater treatment; this factor also influences nitrous oxide (N2O) emissions. This study investigated two simulated intermittently aerated semi-aerobic aged refuse bioreactors (SAARB) filled with 8-year old aged refuse (AR). The research analyzed how differences in and the combination of influent COD and NH4(+)-N impact N2O emissions in leachate treatment. Experimental results showed that N2O emissions increased as the influent COD/NH4(+)-N decreased...
August 12, 2017: Waste Management
https://www.readbyqxmd.com/read/28809478/ruthenium-ii-and-ruthenium-iii-complexes-of-p-benziporphyrin-merging-equatorial-and-axial-organometallic-coordination
#4
Aneta Idec, Miłosz Pawlicki, Lechosław Latos-Grażyński
A diamagnetic ruthenium(II) complex of 5,10,15,20-tetraphenyl-p-benziporphyrin [Ru(II)(p-BzP)(CO)Cl] was obtained via the insertion of ruthenium into p-benziporphyrin using triruthenium(0) dodecacarbonyl [Ru3(CO)12] as the metal source. The procedure applying dichloro(cycloocta-1,5-diene)ruthenium(II) (polymer, [Ru(COD)Cl2]n) afforded the paramagnetic six-coordinate ruthenium(III) p-benziporphyrin [Ru(III)(p-BzP)Cl2]. As shown by X-ray crystallography, the p-phenylene ring in both complexes is sharply tilted out of the N3 plane, as reflected by the respective N3 (pyrrole)-C6 (p-phenylene) dihedral angle [Ru(II)(p-BzP)(CO)Cl, 52...
August 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28807555/improving-biogas-production-from-anaerobic-co-digestion-of-sewage-sludge-with-a-thermal-dried-mixture-of-food-waste-cheese-whey-and-olive-mill-wastewater
#5
A E Maragkaki, I Vasileiadis, M Fountoulakis, A Kyriakou, K Lasaridi, T Manios
Anaerobic co-digestion of sewage sludge and other organic wastes at a wastewater treatment plant (WWTP) is a promising method for both energy and material recovery. However, transportation and storage of wastes to WWTP may be the bottleneck for the successful implementation of this technology. In case of wet wastes and wastewater it is possible to reduce their volume and as a result the transportation and storage cost by using a drying process. During this study, the optimization of biogas production from sewage sludge (SS) was attempted by co-digesting with a dried mixture of food waste, cheese whey and olive mill wastewater (FCO)...
August 11, 2017: Waste Management
https://www.readbyqxmd.com/read/28806651/changes-in-the-process-performance-sludge-production-and-microbial-activity-in-an-activated-sludge-reactor-with-addition-of-a-metabolic-uncoupler-under-different-operating-conditions
#6
E Ferrer-Polonio, J Fernández-Navarro, J L Alonso-Molina, I Amorós-Muñoz, A Bes-Piá, J A Mendoza-Roca
Sludge production in wastewater treatment plants is nowadays a big concern due to the high produced amounts and their characteristics. Consequently, the study of techniques that reduce the sludge generation in wastewater treatment plants is becoming of great importance. In this work, four laboratory sequencing batch reactors (SBRs), which treated municipal wastewater, were operated to study the effect of adding the metabolic uncoupler 3,3',4',5-tetrachlorosalicylanilide (TCS) on the sludge reduction, the SBRs performance and the microbial hydrolytic enzymatic activities (MHEA)...
August 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28803129/low-plasma-glucose-limits-glucose-metabolism-by-rbcs-and-heart-in-some-species-of-teleosts
#7
William R Driedzic
Within teleosts there is a species range in plasma glucose levels from undetectable to 20mM. At low plasma glucose levels the gradient from the extracellular to the intracellular space is decreased. The impact of this on glucose metabolism by RBCs and heart from species with different steady state levels of plasma glucose (Atlantic cod ~5mM; Atlantic salmon ~5mM, cunner ~1mM, lumpfish <1mM; short-horned sculpin <1mM) is the subject of this review. Under normoxia, at physiological levels of extracellular glucose, RBCs and heart produce lactate although the contribution of anaerobic metabolism to ATP production is small...
August 9, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28802136/the-role-of-sulfate-in-aerobic-granular-sludge-process-for-emerging-sulfate-laden-wastewater-treatment
#8
Weiqi Xue, Tianwei Hao, Hamish R Mackey, Xiling Li, Richard C Chan, Guanghao Chen
Sulfate-rich wastewaters pose a major threat to mainstream wastewater treatment due to the unpreventable production of sulfide and associated shift in functional bacteria. Aerobic granular sludge could mitigate these challenges in view of its high tolerance and resilience against changes in various environmental conditions. This study aims to confirm the feasibility of aerobic granular sludge in the treatment of sulfate containing wastewater, investigate the impact of sulfate on nutrient removal and granulation, and reveal metabolic relationships in the above processes...
August 4, 2017: Water Research
https://www.readbyqxmd.com/read/28801173/impacts-of-silver-nanoparticles-on-the-nutrient-removal-and-functional-bacterial-community-in-vertical-subsurface-flow-constructed-wetlands
#9
REVIEW
Juan Huang, Chong Cao, Chunni Yan, Jialiang Liu, Qian Hu, Wenzhu Guan
The widespread utilization of silver nanoparticles (AgNPs) in industrial and commercial products inevitably raises the release into wastewater. In this study, the influences of AgNPs (0, 50 and 200μg/L) on the performance and microbial community of CWs were evaluated. Compared with the control system (without AgNPs), the COD removal was not affected, whereas the TN, NH4(+)-N, and TP removals were evidently affected in presence of AgNPs, and the effects had a positive relation with AgNPs concentration. In addition, AgNPs were effectively removed from wastewater and mainly accumulated in the soil layer and plant tissues...
August 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28800555/simultaneous-nitrogen-and-organics-removal-using-membrane-aeration-and-effluent-ultrafiltration-in-an-anaerobic-fluidized-membrane-bioreactor
#10
Yaoli Ye, Pascal E Saikaly, B E Logan
Dissolved methane and a lack of nutrient removal are two concerns for treatment of wastewater using anaerobic fluidized bed membrane bioreactors (AFMBRs). Membrane aerators were integrated into an AFMBR to form an aeration membrane fluidized bed membrane bioreactor (AeMFMBR) capable of simultaneous removal of organic matter and ammonia without production of dissolved methane. Good effluent quality was obtained with no detectable suspended solids, 93±5% of chemical oxygen demand (COD) removal to 14±11mg/L, and 74±8% of total ammonia (TA) removal to 12±3mg-N/L for domestic wastewater (COD of 193±23mg/L and TA of 49±5mg-N/L) treatment...
August 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28800553/effects-of-different-biofilm-carriers-on-biogas-production-during-anaerobic-digestion-of-corn-straw
#11
Yongdi Liu, Yingdong Zhu, Honghua Jia, Xiaoyu Yong, Lijuan Zhang, Jun Zhou, Zebin Cao, Andrea Kruse, Ping Wei
This study investigated the performance of anaerobic digestion systems using four types of fibrous biofilm carriers, a polypropylene, a polyester, a polyamide, and a polyurethane fiber material. The biogas and methane production, pH, chemical oxygen demand, total solids content, volatile solids content, residual coenzyme F420, and microbial community compositions were determined during the experimental runs. Furthermore, scanning electron microscopy was employed to identify the microbial consortium and examine their attachment onto the surface of the four fibrous biofilm carriers...
July 30, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28800168/malodorogenic-sensing-of-carbon-monoxide
#12
Herbert Plenio, Marvin Bergmann, Meike Egert
A thin film of poly-([IrCl(cod)(NHC-onbe)]n-(propyl-onbe)m) (onbe= oxanorbornene) coated on filter paper reacts quantitatively with CO to yield 1,5-cyclooctadiene, whose unpleasant smell can be detected by the human olfactory system with very high sensitivity. Odorless, but toxic CO is thus "translated" into the distinct smell of 1,5-cyclooctadiene. Based on malodorogenic sensing it is possible to smell the presence of CO.
August 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28799941/fluidized-glass-beads-reduce-fouling-in-a-novel-anaerobic-membrane-bioreactor
#13
B Düppenbecker, S Kale, M Engelhart, P Cornel
This study focuses on the use of fluidized glass beads as turbulence promoters in a laboratory-scale anaerobic membrane bioreactor treating municipal wastewater at 20 °C. The addition of fluidized glass beads into an external tubular ceramic membrane enabled the operation at low crossflow velocities of 0.053-0.073 m/s (mean fluxes between 5.5 and 9.7 L/(m(2)·h)) with runtimes >300 h. Glass beads with a diameter of 1.5 mm were more effective than smaller ones with a diameter of 0.8-1.2 mm. Increasing the bed voidage from 74 to 80% did not show any beneficial effect...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799940/experimental-study-on-treating-agate-dyeing-wastewater-with-sulfate-reducing-bacteria-strengthening-peanut-shells-and-scrap-iron
#14
Junzhen Di, Mingxin Wang
To solve the problems of high concentrations of Cr(6+), SO4(2-) and H(+) in agate dyeing industrial wastewater and heavy pollution and high treating cost, single-factor and orthogonal experiments were conducted to determine the optimum particle size, the ratio of adsorbents dosing and hydraulic retention time based on peanut shells and scrap iron. Experiments, using five dynamic columns filled with the peanut shells, scrap iron and sulfate-reducing bacteria (SRB), were also conducted to determine the effect and mechanism of treating the wastewater...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799934/partially-aerated-submerged-fixed-film-bioreactor-for-simultaneous-removal-of-carbon-and-nutrients-from-high-strength-nitrogen-wastewaters-effect-of-aeration-rate-and-c-n-p-ratio
#15
Mojtaba Forouzesh, Ali Baradar Khoshfetrat, Salman Alizadeh Kordkandi
Influence of aeration rate and COD:N:P (C:N:P) ratio on the performance of an upflow partially aerated submerged fixed film (UP/ASFF) bioreactor for simultaneous carbon and nutrient removal from high-strength nitrogen wastewater was investigated during 6 months. Airflow rates at three levels of 1.5, 3, and 4.5 L/min and C:N:P ratios at four levels of 450:300:10, 450:150:10, 450:100:10, and 450:75:10 were selected as the two main input factors. All experiments were performed at constant chemical oxygen demand (COD), phosphorus (P) and hydraulic residence time of 450 mg COD/L, 10 mg PO4(3-) -P/L and 7...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799929/scaling-up-of-a-zero-valent-iron-packed-anaerobic-reactor-for-textile-dye-wastewater-treatment-a-potential-technology-for-on-site-upgrading-and-rebuilding-of-traditional-anaerobic-wastewater-treatment-plant
#16
Yang Li, Jingxin Zhang, Yaobin Zhang, Xie Quan
Anaerobic digestion (AD) is a cost-effective technology for the treatment of textile dye wastewater with clear environmental benefits. However, the need to improve process feasibility of high treatment efficiency as well as to shorten hydraulic retention time has raised interest on several intensification techniques. Zero valent iron (ZVI) packed anaerobic digesters have the potential to become an on-site upgrading wastewater treatment technology through building a ZVI bed in a traditional AD plant. However, the experiences and knowledge of scale-up are limited...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799928/greywater-characterization-and-handling-practices-among-urban-households-in-ghana-the-case-of-three-communities-in-kumasi-metropolis
#17
Bismark Dwumfour-Asare, Philomina Adantey, Kwabena Biritwum Nyarko, Eugene Appiah-Effah
Greywater management in Ghana receives little or no attention although untreated greywater is associated with environmental and public health risks. This paper assesses greywater characteristics and handling practices among urban households in three selected communities in Kumasi, the second largest city of Ghana. The study involved in-depth surveys (interviews and observations) with 90 households, and collection of 18 greywater samples from nine greywater sources for laboratory analysis. Average greywater generation is 43...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28799143/adsorption-studies-on-the-removal-of-cod-and-bod-from-treated-sewage-using-activated-carbon-prepared-from-date-palm-waste
#18
Abd ElAziz A Nayl, Reda A Elkhashab, Tamer El Malah, Sobhy M Yakout, Mohamed A El-Khateeb, Mahmoud M S Ali, Hazim M Ali
In this work, the adsorption of chemical oxygen demand (COD) and biological oxygen demand (BOD) from treated sewage with low-cost activated carbon prepared from date palm shell waste by chemical activation method was studied. Different parameters affecting the adsorption process such as carbon dose, pH, contact time, agitation rate, and temperature were studied. Adsorption equilibrium was attained after 150 min at pH 6.0 with agitation rate of 400 rpm at 25 °C. The results showed that COD removal percentage of 95...
August 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28795224/extrusion-of-contracaecum-osculatum-nematode-larvae-from-the-liver-of-cod-gadus-morhua
#19
S Zuo, L Barlaup, A Mohammadkarami, A Al-Jubury, D Chen, P W Kania, K Buchmann
Baltic cod livers have during recent years been found increasingly and heavily infected with third-stage larvae of Contracaecum osculatum. The infections are associated with an increasing population of grey seals which are final hosts for the parasite. Heavy worm burdens challenge utilization and safety of the fish liver products, and technological solutions for removal of worms are highly needed. We investigated the attachment of the worm larvae in liver tissue by use of histochemical techniques and found that the cod host encapsulates the worm larvae in layers of host cells (macrophages, fibroblasts) supported by enclosures of collagen and calcium...
August 9, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28795221/development-of-the-first-gene-expression-system-for-salinicoccus-strains-with-potential-application-in-bioremediation-of-hypersaline-wastewaters
#20
Dahe Zhao, Haibo Yang, Junyu Chen, Feiyue Cheng, Sumit Kumar, Jing Han, Ming Li, Jian Zhou, Hua Xiang
Salinicoccus salsiraiae IM408 (=CGMCC13032) is a novel halophilic bacterium that we isolated from the saline soil of Da Gang Oilfield. It tolerates 60 g/l sodium chloride and up to 123 g/l (1.5 M) sodium acetate and has shown a potential application in bioremediation of wastewater with high salt and high chemical oxygen demand (COD). Two plasmids, pS408-1 and pS408-2, were identified in S. salsiraiae IM408, and the sequences and copy numbers of the plasmids were determined. Based on these plasmids, two shuttle vectors containing a replicon for Escherichia coli, ampicillin, and chloramphenicol resistance genes, as well as the replicon from pS408-1 or pS408-2, were constructed and named as pTCS101 and pTCS201, respectively...
August 9, 2017: Applied Microbiology and Biotechnology
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