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Biodegradation

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https://www.readbyqxmd.com/read/29143903/whole-community-transcriptome-of-a-sequencing-batch-reactor-transforming-2-4-dinitroanisole-dnan-and-3-nitro-1-2-4-triazol-5-one-nto
#1
Jennifer Weidhaas, Alexander Panaccione, Ananda Shankar Bhattacharjee, Ramesh Goel, Angela Anderson, Saraswati Poudel Acharya
Two sequencing batch reactors (SBRs) were run to bio-mineralize 2,4-dinitroanisole (DNAN) and 3-nitro-1,2,4-triazol-5-one (NTO) in lab scale settings. The reactors were shown to reproducibly biotransform these munitions under aerobic and anaerobic conditions during the operations of these SBRs. Complete removal (100% biotransformation) of DNAN (initially 17.7 ± 5.4 mg L(-1)) and NTO (initially 15.0 ± 7.1 mg L(-1)) was observed in an anaerobic SBR when Luria-Bertani (LB) broth was present. In contrast, an aerobic SBR degraded only 58 ± 22% of DNAN (initially 19...
November 16, 2017: Biodegradation
https://www.readbyqxmd.com/read/29143902/a-new-aerobic-chemolithoautotrophic-arsenic-oxidizing-microorganism-isolated-from-a-high-andean-watershed
#2
Javiera M Anguita, Claudia Rojas, Pablo A Pastén, Ignacio T Vargas
Biological arsenic oxidation has been suggested as a key biogeochemical process that controls the mobilization and fate of this metalloid in aqueous environments. To the best of our knowledge, only four aerobic chemolithoautotrophic arsenite-oxidizing (CAO) bacteria have been shown to grow via direct arsenic oxidation and to have the essential genes for chemolithoautotrophic arsenite oxidation. In this study, a new CAO bacterium was isolated from a high Andean watershed evidencing natural dissolved arsenic attenuation...
November 16, 2017: Biodegradation
https://www.readbyqxmd.com/read/29128887/the-effect-of-methanogenesis-inhibition-inoculum-and-substrate-concentration-on-hydrogen-and-carboxylic-acids-production-from-cassava-wastewater
#3
Norma C S Amorim, Eduardo L C Amorim, Mario T Kato, Lourdinha Florencio, Savia Gavazza
Manipueira is a carbohydrate-rich agro-industrial waste from cassava processing. It is considered well suitable for biotechnological processes, such as hydrogen and carboxylic acids production, due to the high content of easily degradable organic matter. However, the proper methanogenesis inhibition method, inoculum type, and organic loads are factors still limiting the processes. The objective in this work was to evaluate the effects of such factors on byproducts production in anaerobic reactors. Batch experiments were conducted with 2...
November 11, 2017: Biodegradation
https://www.readbyqxmd.com/read/29080942/novel-mbr_based-main-stream-biological-nutrient-removal-process-high-performance-and-microbial-community
#4
Chuanyi Zhang, Xinhai Xu, Kuixia Zhao, Lianggang Tang, Siqi Zou, Limei Yuan
For municipal wastewater treatment, main stream biological nutrient removal (BNR) process is becoming more and more important. This lab-scale study, novel MBR_based BNR processes (named A2N-MBR and A2NO-MBR) were built. Comparison of the COD removal, results obtained demonstrated that COD removal efficiencies were almost the same in three processes, with effluent concentration all bellowed 30 mg L(-1). However, the two-sludge systems (A2N-MBR and A2NO-MBR) had an obvious advantage over the A(2)/O for denitrification and phosphorus removal, with the average TP removal rates of 91...
October 28, 2017: Biodegradation
https://www.readbyqxmd.com/read/29052043/biodegradation-and-chemotaxis-of-polychlorinated-biphenyls-biphenyls-and-their-metabolites-by-rhodococcus-spp
#5
Hui Wang, Jinxing Hu, Kai Xu, Xianjin Tang, Xinhua Xu, Chaofeng Shen
Two biphenyl-degrading bacterial strains, SS1 and SS2, were isolated from polychlorinated biphenyl (PCB)-contaminated soil. They were identified as Rhodococcus ruber and Rhodococcus pyridinivorans based on the 16S rRNA gene sequence, as well as morphological, physiological and biochemical characteristics. SS1 and SS2 exhibited tolerance to 2000 and 3000 mg/L of biphenyl. And they could degrade 83.2 and 71.5% of 1300 mg/L biphenyl within 84 h, respectively. In the case of low-chlorinated PCB congeners, benzoate and 3-chlorobenzoate, the degradation activities of SS1 and SS2 were also significant...
October 19, 2017: Biodegradation
https://www.readbyqxmd.com/read/29022194/potential-for-cometabolic-biodegradation-of-1-4-dioxane-in-aquifers-with-methane-or-ethane-as-primary-substrates
#6
Paul B Hatzinger, Rahul Banerjee, Rachael Rezes, Sheryl H Streger, Kevin McClay, Charles E Schaefer
The objective of this research was to evaluate the potential for two gases, methane and ethane, to stimulate the biological degradation of 1,4-dioxane (1,4-D) in groundwater aquifers via aerobic cometabolism. Experiments with aquifer microcosms, enrichment cultures from aquifers, mesophilic pure cultures, and purified enzyme (soluble methane monooxygenase; sMMO) were conducted. During an aquifer microcosm study, ethane was observed to stimulate the aerobic biodegradation of 1,4-D. An ethane-oxidizing enrichment culture from these samples, and a pure culture capable of growing on ethane (Mycobacterium sphagni ENV482) that was isolated from a different aquifer also biodegraded 1,4-D...
October 11, 2017: Biodegradation
https://www.readbyqxmd.com/read/28956196/novel-bacteria-capable-of-degrading-phenanthrene-in-activated-sludge-revealed-by-stable-isotope-probing-coupled-with-high-throughput-sequencing
#7
Jibing Li, Dayi Zhang, Mengke Song, Longfei Jiang, Yujie Wang, Chunling Luo, Gan Zhang
The indigenous microorganisms responsible for degrading phenanthrene (PHE) in activated biosludge were identified using DNA-based stable isotope probing. Besides the well-known PHE degraders Burkholderia, Ralstonia, Sinobacteraceae and Arthrobacter, we for the first time linked the taxa Paraburkholderia and Kaistobacter with in situ PHE biodegradation. Analysis of PAH-RHDα gene detected in the heavy DNA fraction of (13)C-PHE treatment suggested the mechanisms of horizontal gene transfer or inter-species hybridisation in PAH-RHD gene spread within the microbial community...
September 27, 2017: Biodegradation
https://www.readbyqxmd.com/read/28956189/effect-of-influent-substrate-ratio-on-anammox-granular-sludge-performance-and-kinetics
#8
Weiqiang Zhu, Jin Li, Huiyu Dong, Dan Wang, Peiyu Zhang
Effect of influent substrate ratio on anammox process was studied in sequencing batch reactor. Operating temperature was fixed at 35 ± 1 °C. Influent pH and hydraulic retention time were 7.5 and 6 h, respectively. When influent NO2(-)-N/NH4(+)-N was no more than 2.0, total nitrogen removal rate (TNRR) increased whereas NH4(+)-N removal rate stabilized at 0.32 kg/(m(3) d). ΔNO2(-)-N/ΔNH4(+)-N increased with enhancing NO2(-)-N/NH4(+)-N. When NO2(-)-N/NH4(+)-N was 4.5, ΔNO2(-)-N/ΔNH4(+)-N was 1.98, which was much higher than theoretical value (1...
September 27, 2017: Biodegradation
https://www.readbyqxmd.com/read/28836032/enhanced-dimethyl-phthalate-biodegradation-by-accelerating-phthalic-acid-di-oxygenation
#9
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
#10
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/28577026/low-temperature-autotrophic-microbial-denitrification-using-thiosulfate-or-thiocyanate-as-electron-donor
#11
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/28755318/characterization-of-the-biodegradation-bioremediation-and-detoxification-capacity-of-a-bacterial-consortium-able-to-degrade-the-fungicide-thiabendazole
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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/28357551/changes-in-the-microbial-community-during-repeated-anaerobic-microbial-dechlorination-of-pentachlorophenol
#18
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
#19
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
#20
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
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