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Biodegradation

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https://www.readbyqxmd.com/read/28836032/enhanced-dimethyl-phthalate-biodegradation-by-accelerating-phthalic-acid-di-oxygenation
#1
Yingxia Tang, Yongming Zhang, Ling Jiang, Chao Yang, Bruce E Rittmann
The aerobic biodegradation of dimethyl phthalate (DMP) is initiated with two hydrolysis reactions that generate an intermediate, phthalic acid (PA), that is further biodegraded through a two-step di-oxygenation reaction. DMP biodegradation is inhibited when PA accumulates, but DMP's biodegradation can be enhanced by adding an exogenous electron donor. We evaluated the effect of adding succinate, acetate, or formate as an exogenous electron donor. PA removal rates were increased by 15 and 30% for initial PA concentrations of 0...
August 23, 2017: Biodegradation
https://www.readbyqxmd.com/read/28780760/pesticide-dissipation-and-microbial-community-changes-in-a-biopurification-system-influence-of-the-rhizosphere
#2
M C Diez, S Elgueta, O Rubilar, G R Tortella, H Schalchli, C Bornhardt, F Gallardo
The dissipation of atrazine, chlorpyrifos and iprodione in a biopurification system and changes in the microbial and some biological parameters influenced by the rhizosphere of Lolium perenne were studied in a column system packed with an organic biomixture. Three column depths were analyzed for residual pesticides, peroxidase, fluorescein diacetate activity and microbial communities. Fungal colonization was analyzed by confocal laser scanning microscopy to assess the extent of its proliferation in wheat straw...
August 5, 2017: Biodegradation
https://www.readbyqxmd.com/read/28755318/characterization-of-the-biodegradation-bioremediation-and-detoxification-capacity-of-a-bacterial-consortium-able-to-degrade-the-fungicide-thiabendazole
#3
Chiara Perruchon, Anastasios Pantoleon, Dimitrios Veroutis, Sara Gallego-Blanco, F Martin-Laurent, Kalliopi Liadaki, Dimitrios G Karpouzas
Thiabendazole (TBZ) is a persistent fungicide used in the post-harvest treatment of fruits. Its application results in the production of contaminated effluents which should be treated before their environmental discharge. In the absence of efficient treatment methods in place, biological systems based on microbial inocula with specialized degrading capacities against TBZ could be a feasible treatment approach. Only recently the first bacterial consortium able to rapidly transform TBZ was isolated. This study aimed to characterize its biodegradation, bioremediation and detoxification potential...
July 28, 2017: Biodegradation
https://www.readbyqxmd.com/read/28712032/copper-stressed-anaerobic-fermentation-biogas-properties-process-stability-biodegradation-and-enzyme-responses
#4
He Hao, Yonglan Tian, Huayong Zhang, Yang Chai
The effect of copper (added as CuCl2) on the anaerobic co-digestion of Phragmites straw and cow dung was studied in pilot experiments by investigating the biogas properties, process stability, substrate degradation and enzyme activities at different stages of mesophilic fermentation. The results showed that 30 and 100 mg/L Cu(2+) addition increased the cumulative biogas yields by up to 43.62 and 20.77% respectively, and brought forward the daily biogas yield peak, while 500 mg/L Cu(2+) addition inhibited biogas production...
July 15, 2017: Biodegradation
https://www.readbyqxmd.com/read/28698922/characterization-of-methyl-parathion-degradation-by-a-burkholderia-zhejiangensis-strain-ceib-s4-3-isolated-from-agricultural-soils
#5
Elida C Popoca-Ursino, Fernando Martínez-Ocampo, Edgar Dantán-González, Enrique Sánchez-Salinas, Ma Laura Ortiz-Hernández
Through the use of an enrichment technique, we isolated from the agricultural soils of Morelos in central México a strain of Burkholderia zhejiangensis identified as CEIB S4-3, it's could use the pesticide methyl parathion (MP) as the only source of carbon and degrade completely p-nitrophenol (PNP). For more efficient MP and PNP degradation by the CEIB S4-3 strain, the absence of an extra carbon source, a large inoculum and an MP concentration up to 50 mg/l are required. Sequence and annotation analysis of the draft genome, showed presence of mpd functional gene, which was expressed and its activity on the MP was confirmed...
July 11, 2017: Biodegradation
https://www.readbyqxmd.com/read/28676995/characteristics-of-nitrogen-removal-and-microbial-community-in-biofilm-system-via-combination-of-pretreated-lignocellulosic-carriers-and-various-conventional-fillers
#6
Jing Zhao, Lijuan Feng, Jincheng Dai, Guangfeng Yang, Jun Mu
Each kind of conventional plastic filler (polyurethane filler, SPR-1 suspension filler, TA-II elastic filler and sphere filler) coupled with alkaline pretreated corncob (A.H.corncob) was applied in each bioreactor system for treating polluted water with nitrate and organics. Results demonstrated that addition of A.H.corncob could achieve simultaneous removal of nitrogen and organics, and coupling of SPR-1 suspension filler with A.H.corncob (R2) had the best performance. In coupling system of R2, the total nitrogen (TN) removal rate improved from below 10% to 55...
July 5, 2017: Biodegradation
https://www.readbyqxmd.com/read/28674758/dimethyl-sulfide-emission-behavior-from-landfill-site-with-air-and-water-control
#7
Yuyang Long, Siyuan Zhang, Yuan Fang, Yao Du, Weijia Liu, Chengran Fang, Dongsheng Shen
Municipal solid waste landfills are responsible for odors affecting the environment and human health. Dimethyl sulfide (DMS) is one of the major odorous compounds known for its low odor threshold and wide distribution. This study examined the generation, migration and emission of DMS in four artificial landfill-simulating reactors: Reactor 1 and Reactor 2, running under anaerobic and semi-aerobic conditions, respectively, without leachate recirculation; and Reactor 3 and Reactor 4, running under anaerobic and semi-aerobic conditions, respectively, with leachate recirculation...
July 3, 2017: Biodegradation
https://www.readbyqxmd.com/read/28656497/the-effect-of-biodegradation-on-gammacerane-in-crude-oils
#8
Haiping Huang
Gammacerane is one of the major biomarkers widely used in depositional environment diagnosis, oil family classification, and oil-source correlation. It is generally accepted that gammacerane is more resistant to biodegradation than regular hopanes. However, whether it is biodegradable as well has not been reported in literatures. In order to investigate the effect of biodegradation on gammacerane in crude oils, 69 core samples from two biodegraded petroleum accumulations were geochemically characterized by quantitative GC-MS analysis...
June 27, 2017: Biodegradation
https://www.readbyqxmd.com/read/28577026/low-temperature-autotrophic-microbial-denitrification-using-thiosulfate-or-thiocyanate-as-electron-donor
#9
Elias Broman, Abbtesaim Jawad, Xiaofen Wu, Stephan Christel, Gaofeng Ni, Margarita Lopez-Fernandez, Jan-Eric Sundkvist, Mark Dopson
Wastewaters generated during mining and processing of metal sulfide ores are often acidic (pH < 3) and can contain significant concentrations of nitrate, nitrite, and ammonium from nitrogen based explosives. In addition, wastewaters from sulfide ore treatment plants and tailings ponds typically contain large amounts of inorganic sulfur compounds, such as thiosulfate and tetrathionate. Release of these wastewaters can lead to environmental acidification as well as an increase in nutrients (eutrophication) and compounds that are potentially toxic to humans and animals...
August 2017: Biodegradation
https://www.readbyqxmd.com/read/28357551/changes-in-the-microbial-community-during-repeated-anaerobic-microbial-dechlorination-of-pentachlorophenol
#10
Hui Tong, Manjia Chen, Fangbai Li, Chengshuai Liu, Changzhong Liao
Pentachlorophenol (PCP) has been widely used as a pesticide in paddy fields and has imposed negative ecological effect on agricultural soil systems, which are in typically anaerobic conditions. In this study, we investigated the effect of repeated additions of PCP to paddy soil on the microbial communities under anoxic conditions. Acetate was added as the carbon source to induce and accelerate cycles of the PCP degradation. A maximum degradation rate occurred at the 11th cycle, which completely transformed 32...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28285343/impact-of-biogenic-substrates-on-sulfamethoxazole-biodegradation-kinetics-by-achromobacter-denitrificans-strain-pr1
#11
P Y Nguyen, Gilda Carvalho, A C Reis, O C Nunes, M A M Reis, A Oehmen
Pure cultures have been found to degrade pharmaceutical compounds. However, these cultures are rarely characterized kinetically at environmentally relevant concentrations. This study investigated the kinetics of sulfamethoxazole (SMX) degradation by Achromobacter denitrificans strain PR1 at a wide range of concentrations, from ng/L to mg/L, to assess the feasibility of using it for bioaugmentation purposes. Complete removal of SMX occurred for all concentrations tested, i.e., 150 mg/L, 500 µg/L, 20 µg/L, and 600 ng/L...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28265780/the-metabolic-pathway-of-metamifop-degradation-by-consortium-me-1-and-its-bacterial-community-structure
#12
Weiliang Dong, Kuan Liu, Fei Wang, Fengxue Xin, Wenming Zhang, Min Zhang, Hao Wu, Jiangfeng Ma, Min Jiang
Metamifop is universally used in agriculture as a post-emergence aryloxyphenoxy propionate herbicide (AOPP), however its microbial degradation mechanism remains unclear. Consortium ME-1 isolated from AOPP-contaminated soil can degrade metamifop completely after 6 days and utilize it as the carbon source for bacterial growth. Meanwhile, consortium ME-1 possessed the ability to degrade metamifop stably under a wide range of pH (6.0-10.0) or temperature (20-42 °C). HPLC-MS analysis shows that N-(2-fluorophenyl)-2-(4-hydroxyphenoxy)-N-methyl propionamide, 2-(4-hydroxyphenoxy)-propionic acid, 6-chloro-2-benzoxazolinone and N-methyl-2-fluoroaniline, were detected and identified as four intermediate metabolites...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28260134/simultaneous-di-oxygenation-and-denitrification-in-an-internal-circulation-baffled-bioreactor
#13
Ling Jiang, Yingxia Tang, Weihua Sun, Na Yi, Yongming Zhang, Hanchang Shi, Bruce E Rittmann
An internal circulation baffled bioreactor was employed to realize simultaneous di-oxygenation of phthalic acid (PA) and denitrification of nitrate, which require aerobic and anoxic conditions, respectively. Adding a small concentration of succinate as an exogenous electron donor stimulated PA di-oxygenation, which produced readily oxidizable downstream products whose oxidation also enhanced denitrification of nitrate; succinate addition also stimulated denitrification. Depending on the concentration of PA, addition of 0...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28251436/important-amino-acid-residues-of-hexachlorocyclohexane-dehydrochlorinases-lina-for-enantioselective-transformation-of-hexachlorocyclohexane-isomers
#14
Nidhi Shrivastava, Ankit S Macwan, Hans-Peter E Kohler, Ashwani Kumar
LinA-type1 and LinA-type2 are two well-characterized variants of the enzyme 'hexachlorocyclohexane (HCH)-dehydrochlorinase'. They differ from each other at ten amino acid positions and exhibit differing enantioselectivity for the transformation of the (-) and (+) enantiomers of α-HCH. Amino acids responsible for this enantioselectivity, however, are not known. An in silico docking analysis identified four amino acids (K20, L96, A131, and T133) in LinA-type1 that could be involved in selective binding of the substrates...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28185023/nitrogen-removal-performance-of-anaerobic-ammonia-oxidation-anammox-in-presence-of-organic-matter
#15
Weiqiang Zhu, Peiyu Zhang, Deshuang Yu, Huiyu Dong, Jin Li
A sequencing batch reactor (SBR) was used to test the nitrogen removal performance of anaerobic ammonium oxidation (ANAMMOX) in presence of organic matter. Mesophilic operation (30 ± 0.5 °C) was performed with influent pH 7.5. The results showed, independent of organic matter species, ANAMMOX reaction was promoted when COD was lower than 80 mg/L. However, specific ANAMMOX activity decreased with increasing organic matter content. Ammonium removal efficiency decreased to 80% when COD of sodium succinate, sodium potassium tartrate, peptone and lactose were 192...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28168378/characterization-of-a-novel-micro-pressure-swirl-reactor-for-removal-of-chemical-oxygen-demand-and-total-nitrogen-from-domestic-wastewater-at-low-temperature
#16
Qingkai Ren, Yang Yu, Suiyi Zhu, Dejun Bian, Mingxin Huo, Dandan Zhou, Hongliang Huo
 A novel micro-pressure swirl reactor (MPSR) was designed and applied to treat domestic wastewater at low temperature by acclimating microbial biomass with steadily decreasing temperature from 15 to 3 °C. Chemical oxygen demand (COD) was constantly removed by 85% and maintained below 50 mg L(-1) in the effluent during the process. When the air flow was controlled at 0.2 m(3) h(-1), a swirl circulation was formed in the reactor, which created a dissolved oxygen (DO) gradient with a low DO zone in the center and a high DO zone in the periphery for denitrification and nitrification...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28154986/biodegradation-of-5-chloro-2-picolinic-acid-by-novel-identified-co-metabolizing-degrader-achromobacter-sp-f1
#17
Zhi-Guo Wu, Fang Wang, Li-Qun Ning, Robert D Stedtfeld, Zong-Zheng Yang, Jing-Guo Cao, Hong-Jie Sheng, Xin Jiang
Several bacteria have been isolated to degrade 4-chloronitrobenzene. Degradation of 4-chloronitrobenzene by Cupriavidus sp. D4 produces 5-chloro-2-picolinic acid as a dead-end by-product, a potential pollutant. To date, no bacterium that degrades 5-chloro-2-picolinic acid has been reported. Strain f1, isolated from a soil polluted by 4-chloronitrobenzene, was able to co-metabolize 5-chloro-2-picolinic acid in the presence of ethanol or other appropriate carbon sources. The strain was identified as Achromobacter sp...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28116618/advanced-oxidation-process-and-biological-treatments-for-table-olive-processing-wastewaters-constraints-and-a-novel-approach-to-integrated-recycling-process-a-review
#18
REVIEW
Lamia Ayed, Nedra Asses, Nadia Chammem, Nada Ben Othman, Moktar Hamdi
Table olive processing wastewaters constitute a dangerous environmental problem in the Mediterranean countries because of their large volumes, high organic matter and salt concentration. The quantity and the characteristics of wastewaters produced, and thus, their environmental impact, varied depending on the season, varieties, soil and process employed. Several chemicals, biological and combined technologies have proven effective at bringing down organic pollution and toxicity of these effluents. Advanced oxidation processes have recognized as highly efficient treatments for the degradation of organic matter...
June 2017: Biodegradation
https://www.readbyqxmd.com/read/28567707/anaerobic-digestion-of-amine-oxide-based-surfactants-biodegradation-kinetics-and-inhibitory-effects
#19
Francisco Ríos, Manuela Lechuga, Alejandro Fernández-Arteaga, Encarnación Jurado, Mercedes Fernández-Serrano
Recently, anaerobic degradation has become a prevalent alternative for the treatment of wastewater and activated sludge. Consequently, the anaerobic biodegradability of recalcitrant compounds such as some surfactants require a thorough study to avoid their presence in the environment. In this work, the anaerobic biodegradation of amine-oxide-based surfactants, which are toxic to several organisms, was studied by measuring of the biogas production in digested sludge. Three amine-oxide-based surfactants with structural differences in their hydrophobic alkyl chain were tested: Lauramine oxide (AO-R12), Myristamine oxide (AO-R14) and Cocamidopropylamine oxide (AO-cocoamido)...
May 31, 2017: Biodegradation
https://www.readbyqxmd.com/read/28534126/optimization-of-continuous-flow-solid-phase-denitrification-via-coupling-carriers-in-enhancing-simultaneous-removal-of-nitrogen-and-organics-for-agricultural-runoff-purification
#20
Yi Lu, Xiaoqing Zhang, Lijuan Feng, Guangfeng Yang, Zhou Zheng, Junzhi Liu, Jun Mu
Coupling of biodegradable corncob and plastic carrier was optimized in continuous-flow solid-phase denitrification systems for enhancing simultaneously removal of nitrogen and organics in agricultural runoff. In compared with preposition of plastic carriers and mixed distribution method, it was demonstrated that the preposition of corncobs simultaneously enhanced nitrate (6.64 ± 1.35 mg L(-1) day (-1)) and organics removal (6.33 ± 1.44 mg L(-1) day(-1)) at a hydraulic retention time (HRT) of 6 h...
May 22, 2017: Biodegradation
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