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https://www.readbyqxmd.com/read/28437742/biological-treatment-of-model-dyes-and-textile-wastewaters
#1
Alicia Paz, Julia Carballo, María José Pérez, José Manuel Domínguez
Previous works conducted in our laboratory, reveled that Bacillus aryabhattai DC100 produce ligninolytic enzymes such as laccases and/or peroxidases, opening new applications in different bioprocesses, including the treatment of disposal residues such as dyestuffs from textile processing industries. This work described the degradation of three commercial model dyes Coomassie Brilliant Blue G-250 (CBB), Indigo Carmine (IC) and Remazol Brilliant Blue R (RBBR) under different culture media and operational conditions...
April 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28437644/substrate-inhibition-and-concentration-control-in-an-uasb-anammox-process
#2
Haiyuan Ma, Qigui Niu, Yanlong Zhang, Shilong He, Yu-You Li
An UASB-Anammox reactor was operated for more than one year to study the process performance variations respond to the nitrogen loading rate (NLR) and substrate concentration. The IC10 (451.1mg/L), IC50 (725.3mg/L) and the prospected threshold of influent total nitrogen (TN) concentration were simulated. A stable TN removal efficiency was obtained when the TN influent was controlled. The disequilibrium distribution of the substrate following the plug flow with the height of the reactor resulted in significant variations in specific Anammox activity from the bottom to the top of the reactor (348→3mgN/gVSS/d)...
April 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433906/treatment-of-urban-sludge-by-hydrothermal-carbonization
#3
Xiwei Xu, Enchen Jiang
Urban sludge was treated by Hydrothermal carbonization (HTC). The effect of hydrothermal carbonization temperature, mixing with or without catalysts on solid products yield, heavy metal contents, turbidity and COD value was evaluated. The result showed solid products yield decreased from 92.04% to 52.65% when the temperature increased from 180 to 300°C. And the Cu, Zn, and Pb contents under exchangeable states decreased and reached discharge standard. Addition of FeCl3 or Al(OH)3 resulted in a significant increase in the exchangeable states of Zn, Pb, Cr, and Cd and decrease in their residual states...
March 30, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433902/evaluation-of-different-types-of-anaerobic-seed-sludge-for-the-high-rate-anaerobic-digestion-of-pig-slurry-in-uasb-reactors
#4
Carlos Rico, Jesús A Montes, José Luis Rico
Three different types of anaerobic sludge (granular, thickened digestate and anaerobic sewage) were evaluated as seed inoculum sources for the high rate anaerobic digestion of pig slurry in UASB reactors. Granular sludge performance was optimal, allowing a high efficiency process yielding a volumetric methane production rate of 4.1LCH4L(-1)d(-1) at 1.5days HRT (0.248LCH4g(-1)COD) at an organic loading rate of 16.4gCODL(-1)d(-1). The thickened digestate sludge experimented flotation problems, thus resulting inappropriate for the UASB process...
April 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433896/in-situ-sludge-pretreatment-in-a-single-stage-anaerobic-digester
#5
Yun Chen, Keke Xiao, Xie Jiang, Nan Shen, Raymond J Zeng, Yan Zhou
This study aimed to develop an in-situ sludge pretreatment method by increasing the temperature from thermophilic to extreme thermophilic condition in a single-stage anaerobic digester. The results revealed that a stable performance was obtained within the temperature range of 55-65°C, and the maximum methane yield of 208.51±13.66mL/g VS was obtained at 65°C. Moreover, the maximum extent of hydrolysis (33%) and acidification (27.1%) was also observed at 65°C. However, further increase of temperature to 70°C did not improve the organic conversion efficiency...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433879/sulfamethoxazole-degradation-in-anaerobic-sulfate-reducing-bacteria-sludge-system
#6
Yanyan Jia, Samir Kumar Khanal, Huiqun Zhang, Guang-Hao Chen, Hui Lu
Sulfamethoxazole (SMX) is one of the most commonly used antibiotics. SMX degradation in sulfate-reducing bacteria (SRB) sludge systems has not been reported so far. This research investigated the SMX degradation using SRB sludge in a sulfate-reducing up-flow sludge bed reactor. Moreover, the mechanisms and kinetics of SMX removal were also investigated using SRB sludge via a series of batch experiments. The results showed that SMX removal was characterized by a rapid sorption onto SRB sludge, and desorption from SRB sludge to aqueous phase until achieving equilibrium, and then followed by slow biodegradation...
April 17, 2017: Water Research
https://www.readbyqxmd.com/read/28433692/enhanced-biological-phosphorus-removal-at-low-sludge-retention-time-in-view-of-its-integration-in-a-stage-systems
#7
Carlos Chan, Albert Guisasola, Juan Antonio Baeza
The two-stage A/B WWTP configuration is being studied as a possible wastewater treatment with low energy consumption or even with a net energy generation. The first phase, A-stage, is designed to remove organic matter at very short Sludge Retention Time (SRT), while the B-stage is based on autotrophic nitrogen removal. However, P-removal in the A/B process usually only relies on precipitation. This work studies the potential inclusion of Enhanced Biological Phosphorus Removal (EBPR) in the A-stage phase. For this aim, the long-term operation of three different Sequencing Batch Reactors (SBR) enriched in Accumulibacter at low SRT was thoroughly monitored for more than three months each one...
April 9, 2017: Water Research
https://www.readbyqxmd.com/read/28433683/municipal-wastewater-sludge-as-a-sustainable-bioresource-in-the-united-states
#8
Timothy E Seiple, André M Coleman, Richard L Skaggs
Within the United States and Puerto Rico, publicly owned treatment works (POTWs) process 130.5 Gl/d (34.5 Bgal/d) of wastewater, producing sludge as a waste product. Emerging technologies offer novel waste-to-energy pathways through whole sludge conversion into biofuels. Assessing the feasibility, scalability and tradeoffs of various energy conversion pathways is difficult in the absence of highly spatially resolved estimates of sludge production. In this study, average wastewater solids concentrations and removal rates, and site specific daily average influent flow are used to estimate site specific annual sludge production on a dry weight basis for >15,000 POTWs...
April 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28432991/characteristics-of-adapted-hydrogenotrophic-community-during-biomethanation
#9
Lydia Rachbauer, Reinhard Beyer, Günther Bochmann, Werner Fuchs
The results presented in this study were carried out as concomitant experiments during the start-up and operation of a biomethanation unit to evaluate the effect of process parameters on carbon conversion, product formation (methane and acetate) and community composition. For that, two different samples were withdrawn from a trickle-bed reactor with immobilized enrichment culture of hydrogenotrophic methanogens adapted from sewage sludge. One sample was taken from the recirculation liquid during start-up phase while the other was withdrawn directly from the carrier material in the reactor...
April 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28432885/from-laboratory-to-field-studies-the-assessment-of-biscutella-laevigata-suitability-to-biological-reclamation-of-areas-contaminated-with-lead-and-cadmium
#10
Ewa Muszyńska, Ewa Hanus-Fajerska, Barbara Piwowarczyk, Joanna Augustynowicz, Krystyna Ciarkowska, Tomasz Czech
The aim of the work was to evaluate the usefulness of the in vitro multiplication of Biscutella laevigata calamine ecotype for in situ reclamation of post-flotation wastes polluted with Pb and Cd. The experiment was conducted on three steps: (i) plant shoots' production under in vitro condition, (ii) establishment of the material in greenhouse experiment, and finally (iii) field cultivation directly on the mining-waste heap of Olkusz Ore-Bearing Region, Poland. This region is known to be one of the most chemically-degraded area in central Europe...
April 19, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28432622/diversity-shift-in-bacterial-phenol-hydroxylases-driven-by-alkyl-phenols-in-oil-refinery-wastewaters
#11
Besma Harzallah, Hacène Bousseboua, Yves Jouanneau
Phenol hydroxylases (PHs) play a primary role in the bacterial degradation of phenol and alkylphenols. They are divided into two main classes, single-component and multi-component PHs, having distinctive catalytic subunits designated as PheA1 and LmPH, respectively. The diversity of these enzymes is still largely unexplored. Here, both LmPH and pheA1 gene sequences were examined in activated sludge from oil refinery wastewaters. Phenol, p-cresol, or 3,4-dimethylphenol (3,4-DMP) supplied as extra carbon sources were rapidly mineralized by the microbial community...
April 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28427739/boosting-biogas-production-from-sewage-sludge-by-adding-small-amount-of-agro-industrial-by-products-and-food-waste-residues
#12
A E Maragkaki, M Fountoulakis, A Kyriakou, K Lasaridi, T Manios
In Greece, in many cities, wastewater treatment plants (WWTPs) operate their own anaerobic digestion (AD) facility in order to treat sewage sludge rather than achieve optimum biogas production. Nowadays, there is a growing interest regarding the addition of other co-substrates in these existing facilities in order to increase gas yield from the biomass. This practice may be possible by adding small amount of co-substrates which will not affect significantly in the designed hydraulic retention time. Nonetheless, the lack of experimental data regarding this option is a serious obstacle...
April 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28427657/tube-reactors-as-a-novel-ultrasonication-system-for-trouble-free-treatment-of-sludges
#13
Konrad Koch, Thomas Lippert, Natalia Hauck Sabadini, Jörg E Drewes
The performance of a novel low-maintenance tube reactor for ultrasonic treatment of sludge has been evaluated. The effects of sonication on the release of soluble chemical oxygen demand (sCOD) and anaerobic digestibility of raw and digested sewage sludge as well as agricultural sludge were studied. Results suggest that solubilization and digestibility is dependent on both type of sludge and the energy input. Digested and raw sludge showed high degree of solubilization, however, methane production was only increased for digested sludge...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426987/a-review-on-nitrous-oxide-n2o-emissions-during-biological-nutrient-removal-from-municipal-wastewater-and-sludge-reject-water
#14
REVIEW
Theoni Maria Massara, Simos Malamis, Albert Guisasola, Juan Antonio Baeza, Constantinos Noutsopoulos, Evina Katsou
Nitrous oxide (N2O) is an important pollutant which is emitted during the biological nutrient removal (BNR) processes of wastewater treatment. Since it has a greenhouse effect which is 265 times higher than carbon dioxide, even relatively small amounts can result in a significant carbon footprint. Biological nitrogen (N) removal conventionally occurs with nitrification/denitrification, yet also through advanced processes such as nitritation/denitritation and completely autotrophic N-removal. The microbial pathways leading to the N2O emission include hydroxylamine oxidation and nitrifier denitrification, both activated by ammonia oxidizing bacteria, and heterotrophic denitrification...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28425663/management-of-acute-cholangitis-as-a-result-of-occlusion-from-a-self-expandable-metallic-stent-in-patients-with-malignant-distal-and-hilar-biliary-obstructions
#15
Hideyuki Shiomi, Kazuya Matsumoto, Hiroyuki Isayama
Acute cholangitis as a result of common bile duct stones can be managed; however, cholangitis caused by occlusion with a biliary self-expandable metallic stent (SEMS) in patients with an unresectable malignant biliary obstruction has not been fully discussed. The acute cholangitis clinical guidelines (Tokyo Guidelines 2013) recommend following the same procedure as that used for cholangitis; however, the patient's condition, including performance status, tumor extension or staging, and prognosis must be considered...
April 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28424846/summary-of-the-preservation-techniques-and-the-evolution-of-the-anammox-bacteria-characteristics-during-preservation
#16
REVIEW
Hui Chen, Ren-Cun Jin
The anaerobic ammonium oxidation (anammox) process is a promising wastewater treatment method for biological nitrogen removal. A sufficient amount of active anammox sludge as a seed is crucial to the fast establishment and stability of the anammox process. Anammox bacteria is a kind of microorganism which is sensitive to the environmental conditions, e.g., oxygen, temperature. The optimum temperature and pH for the growth of the anammox bacteria are 30-40 °C and 6.7-8.3. A proper preservation technique allows fast start-up of the anammox process, overcoming the long doubling time of anammox biomass...
April 19, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28421522/individual-and-combined-inhibition-of-phenol-and-thiocyanate-on-microbial-activity-of-partial-nitritation
#17
Qiong Guo, Zhi-Jian Shi, Chen-Chen Yang, Mei Huang, Jia-Li Xu, Yi-Qun Xu, Wei-Min Ni, Ren-Cun Jin
This study evaluated the individual and interactive effect of phenol and thiocyanate (SCN(-)) on partial nitritation (PN) activity using batch test and response surface methodology. The IC50 of phenol and SCN(-) on PN sludge were 5.6 and 351 mg L(-1), respectively. The PN sludge was insensitive to phenol and SCN(-) at levels lower than 1.77 and 43.3 mg L(-1), respectively. A regression model equation was developed and validated to predict the relative specific respiration rate (RSRR) of PN sludge exposed to different phenol and SCN(-) concentrations...
April 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28419953/exploiting-extracellular-polymeric-substances-eps-controlling-strategies-for-performance-enhancement-of-biological-wastewater-treatments-an-overview
#18
REVIEW
Yahui Shi, Jinhui Huang, Guangming Zeng, Yanling Gu, Yaoning Chen, Yi Hu, Bi Tang, Jianxin Zhou, Ying Yang, Lixiu Shi
Extracellular polymeric substances (EPS) are present both outside of the cells and in the interior of microbial aggregates, and account for a main component in microbial aggregates. EPS can influence the properties and functions of microbial aggregates in biological wastewater treatment systems, and specifically EPS are involved in biofilm formation and stability, sludge behaviors as well as sequencing batch reactors (SBRs) granulation whereas they are also responsible for membrane fouling in membrane bioreactors (MBRs)...
April 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28415001/degradation-of-synthetic-fragrances-by-laccase-mediated-system
#19
Laura Vallecillos, Yumna Sadef, Francesc Borrull, Eva Pocurull, Kai Bester
Laccase mediator systems are important biodegradation agents as the rate of reaction could be enhanced in the presence of redox mediators. In the present study the commercial enzyme laccase from Trametes versicolor and the redox mediator 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) were used for the biotransformation of the synthetic fragrances 1-(1,2,3,4,5,6,7,8-octahydro-2,3,8,8,-tetramethyl-2-naphthyl)ethan-1-one (Iso-E-Super, OTNE), 1,3,4,6,7,8,-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta-[g]-2-benzopyran (Galaxolide, HHCB), 7-acetyl-1,1,3,4,4,6-hexamethyl-1,2,3,4-tetrahydronaphtalene (Tonalide, AHTN) and the transformation product of HHCB, 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta-[g]-2-benzopyran-1-one (Galaxolidone, HHCB-lactone) in water...
April 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28414964/insights-into-the-short-term-effects-of-ceo2-nanoparticles-on-sludge-dewatering-and-related-mechanism
#20
Guoxiang You, Peifang Wang, Jun Hou, Chao Wang, Yi Xu, Lingzhan Miao, Bowen Lv, Yangyang Yang, Zhilin Liu, Fei Zhang
As CeO2 nanoparticles (NPs) are used in many applications, the released particles eventually enter wastewater treatment plants, influencing sludge dewatering and increasing the disposal costs. We conducted tests to gain insight into the sludge dewatering performance and the potential mechanism related to the distribution and production of extracellular polymeric substances (EPS). In addition, we conducted single-factor tests with six concentrations of CeO2 NPs in sequencing batch reactors containing matured activated sludge...
April 8, 2017: Water Research
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