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https://www.readbyqxmd.com/read/28813691/effects-of-superabsorbent-polymers-on-the-abundances-of-antibiotic-resistance-genes-mobile-genetic-elements-and-the-bacterial-community-during-swine-manure-composting
#1
Aiyun Guo, Jie Gu, Xiaojuan Wang, Ranran Zhang, Yanan Yin, Wei Sun, Xiaxia Tuo, Li Zhang
Superabsorbent polymers (SAPs) are considered suitable amendments for reducing the selection pressure due to heavy metals and the abundances of antibiotic resistance genes (ARGs) during composting. In this study, three SAP (sodium polyacrylate) levels (0, 5, and 15mgkg(-1) of compost) were applied and their effects on the abundances of ARGs, mobile genetic elements (MGEs), and the bacterial community were investigated. After composting, the abundances of ARGs and MGEs decreased to different extent, where the removal efficiencies for tetW, dfrA7, ermX, aac(6')-ib-cr and MGEs exceeded 90%...
August 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28806673/preservation-and-reactivation-of-candidatus-jettenia-asiatica-and-anammoxoglobus-propionicus-using-different-preservative-agents
#2
A Viancelli, M C Pra, L A Scussiato, M Cantão, A M G Ibelli, A Kunz
Anaerobic ammonium oxidation (anammox) bacteria have peculiar characteristics that make them difficult to cultivate. The conservation of these microorganisms in culture collections or laboratories requires successful preservation and reactivation techniques. Furthermore, studies have shown that successful reactivation may be preservative dependent. Considering this, the present study aimed to evaluate the preservation and reactivation of anammox consortia enriched from swine manure treatment lagoons, by using different preservative agents at different temperatures: KNO3 (at 4 °C), glycerol (-20 °C, -80 °C), and skimmed cow milk (-20 °C, -80 °C, -200 °C)...
July 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28803100/optimization-of-aqueous-ammonia-soaking-of-manure-fibers-by-response-surface-methodology-for-unlocking-the-methane-potential-of-swine-manure
#3
Anna Lymperatou, Hariklia N Gavala, Ioannis V Skiadas
Swine manure mono-digestion often results to economically non-feasible processes, due to the high dilution and ammonia concentration together with the low degradation rates it presents. The effects of different parameters of Aqueous Ammonia Soaking (AAS) as a pretreatment for improving the digestion of manure fibers when coupled to an ammonia removal step were investigated in this study. Response Surface Methodology was followed and the influence and interactions of the following AAS parameters were studied: NH3 concentration, duration and solid-to-liquid ratio...
July 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28802274/horizontal-dissemination-of-antimicrobial-resistance-determinants-in-multiple-salmonella-serotypes-following-isolation-from-the-environment-of-commercial-swine-operations-after-manure-application
#4
Suchawan Pornsukarom, Siddhartha Thakur
The aim of this study was to characterize the plasmids carrying antimicrobial resistance (AMR) determinants in multiple Salmonella serotypes recovered from the commercial swine farms environment after manure application on land. Manure and soil samples were collected on day0 before and after manure application on six farms in North Carolina and sequential soil samples were recollected on day7, 14, and 21 from the same plots. All environmental samples were processed for Salmonella and their plasmid contents were further characterized...
August 11, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28780258/behavior-of-antibiotic-resistance-genes-during-co-composting-of-swine-manure-with-chinese-medicinal-herbal-residues
#5
Li Zhang, Jie Gu, Xiaojuan Wang, Wei Sun, Yanan Yin, Yixin Sun, Aiyun Guo, Xiaxia Tuo
Swine manure is considered to be a reservoir for antibiotic resistance genes (ARGs) but little is known about the variations in ARGs during the co-composting of swine manure with Chinese medicinal herbal residues (CMHRs). Thus, this study explored the effects of CMHRs on the variations in ARGs during co-composting with swine manure. The results showed that CMHRs could reduce effectively most of the targeted ARGs (0.18-2.82logs) and mobile genetic elements (MGEs) (0.47-3.34logs). The correlations indicated that CMHRs might decrease the spread of ARGs via horizontal gene transfer...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28771598/impacts-of-leachates-from-livestock-carcass-burial-and-manure-heap-sites-on-groundwater-geochemistry-and-microbial-community-structure
#6
Man Jae Kwon, Seong-Taek Yun, Baknoon Ham, Jeong-Ho Lee, Jun-Seop Oh, Weon-Wha Jheong
We investigated the impacts of leachates from a swine carcass burial site and a cow manure heap on the geochemical and microbiological properties of agricultural water samples, including leachate, groundwater from monitoring wells and background wells, and stream water. The leachate from the livestock burial site showed extremely high electrical conductivity, turbidity, and major ion concentrations, but low redox potential and dissolved oxygen levels. The groundwater in the monitoring wells adjacent to both sites showed severe contamination from the leachate, as indicated by the increases in EC, turbidity, Cl-, and SO42-...
2017: PloS One
https://www.readbyqxmd.com/read/28766484/anaerobic-digestion-effluents-ades-treatment-coupling-with-chlorella-sp-microalgae-production
#7
(no author information available yet)
Nutrient removal effectiveness from anaerobic digestion effluents (ADEs) by Chlorella sp. cultivation and microalgae biomass productivity were evaluated in this study. The results showed that the highest Chlorella sp. biomass productivities of 386.5±24.1 mg dry weight (DW)/L·d and 338.3±11.0 mg DW/L·d were respectively obtained with the anaerobically digested effluent of municipal wastewater sludge (WS) and effluent from a fermentation tank treating dairy wastewater (DW). Lower (p<0.05) microalgal growth was achieved with anaerobically digested effluents of maize silage and swine slurry (MS) and cattle manure (CM)...
July 11, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28727028/production-management-and-the-environment-symposium-measurement-and-mitigation-of-reactive-nitrogen-species-from-swine-and-poultry-production
#8
W Powers, M Capelari
Reactive nitrogen (Nr) species include oxides of nitrogen [N; nitric oxide, nitrogen dioxide and nitrous oxide (NO)], anions (nitrate and nitrite), and amine derivatives [ammonia (NH), ammonium salts and urea]. Of the different Nr species, air emissions from swine and poultry facilities are predominantly NH followed by NO. Excreta emissions are NH, ammonium ions, and urea with trace amounts of nitrate and nitrite. Farm systems and practices that handle manure as a wet product without pH modification favor almost exclusive NH production...
May 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28721626/fate-of-antimicrobial-resistance-genes-in-response-to-application-of-poultry-and-swine-manure-in-simulated-manure-soil-microcosms-and-manure-pond-microcosms
#9
Mianzhi Wang, Yongxue Sun, Peng Liu, Jing Sun, Qin Zhou, Wenguang Xiong, Zhenling Zeng
This study aimed to determine the occurrence, abundance, and fate of nine important antimicrobial resistance genes (ARGs) (sul1, sul2, tetB, tetM, ermB, ermF, fexA, cfr, and Intl1) in the simulated soil and pond microcosms following poultry and swine manure application. Absolute quantitative PCR method was used to determine the gene copies. The results were modeled as a logarithmic regression (N = mlnt + b) to explore the fate of target genes. Genes sul1, Intl1, sul2, and tetM had the highest abundance following the application of the two manure types...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28711002/effect-of-temperature-on-sulfonamide-antibiotics-degradation-and-on-antibiotic-resistance-determinants-and-hosts-in-animal-manures
#10
Hui Lin, Jin Zhang, Hongjin Chen, Jianmei Wang, Wanchun Sun, Xin Zhang, Yuyi Yang, Qiang Wang, Junwei Ma
Animal manure is a main reservoir of antibiotic residues and antibiotic resistance. Here, the effect of temperature on sulfonamide antibiotics (SAs), sulfonamide-resistant (SR) genes/bacteria was investigated by aerobically incubating swine and chicken manures at different temperatures. In swine manure, the SAs concentration declined with increasing temperature, with a minimum at 60°C. In chicken manure, the greatest degradation of SAs was noted at 30°C. The reduction of relative abundance of antibiotic resistance genes (ARGs) and sul-positive hosts in swine manure was more pronounced during thermophilic than mesospheric incubation; neither temperature conditions effectively reduced these parameters in chicken manure...
July 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28709075/effects-of-chromium-iii-on-enzyme-activities-and-bacterial-communities-during-swine-manure-composting
#11
Yanan Yin, Jie Gu, Xiaojuan Wang, Wen Song, Kaiyu Zhang, Xin Zhang, Chunya Lu, Jiayao Liu
The present study investigated the effects of different concentrations of chromium (i.e., 200 and 700mgkg(-1) Cr corresponding to Cr200 and Cr700, respectively) on the microorganisms in swine manure compost. The results demonstrated that a high concentration of Cr(III) could inhibit the activity of key microbial enzymes (i.e., dehydrogenase, cellulase, and urease) in the early composting stages, with maximal inhibition rates of 54.9%, 32.8%, and 46.7% for cellulase, urease, and dehydrogenase, respectively. Furthermore, the bacterial abundances were determined by quantitative PCR and their compositions were evaluated by denaturing gradient gel electrophoresis...
July 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28688324/growing-chlorella-vulgaris-on-thermophilic-anaerobic-digestion-swine-manure-for-nutrient-removal-and-biomass-production
#12
Xiang-Yuan Deng, Kun Gao, Ren-Chuan Zhang, Min Addy, Qian Lu, Hong-Yan Ren, Paul Chen, Yu-Huan Liu, Roger Ruan
Liquid swine manure was subjected to thermophilic anaerobic digestion, ammonia stripping and centrifugation in order to increase the available carbon sources and decrease the ammonia concentration and turbidity. Chlorella vulgaris (UTEX 2714) was grown on minimally diluted (2×, 3× and 4×) autoclaved and non-autoclaved pretreated anaerobic digestion swine manure (PADSM) in a batch-culture system for 7days. Results showed that C. vulgaris (UTEX 2714) grew best on 3× PADSM media, and effectively removed NH4(+)-N, TN, TP and COD by 98...
June 26, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28672198/phosphate-recovery-from-liquid-fraction-of-anaerobic-digestate-using-four-slow-pyrolyzed-biochars-dynamics-of-adsorption-desorption-and-regeneration
#13
Simon Kizito, Hongzhen Luo, Shubiao Wu, Zeeshan Ajmal, Tao Lv, Renjie Dong
Four slow pyrolyzed biochars produced from wood (WDB), corncobs (CCB), rice husks (RHB) and sawdust (SDB) were evaluated for adsorption, desorption and regeneration of phosphate (PO4(3-)-P) from anaerobically digested liquid swine manure. The PO4(3-)-P adsorption capacity increased followed by initial concentrations increasing. Maximum PO4(3-)-P adsorptions at initial 150 mg/L of PO4(3-)-P (highest load) were average of 7.67, 6.43, 5.73 and 5.41 mg/g for WDB, CCB, RHB and SDB, respectively. Pseudo second order kinetics model could best fit PO4(3-)-P adsorption, which indicated the chemisorption via precipitation was the main mechanism for PO4(3-)-P removal...
June 30, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28604783/chemical-structures-and-characteristics-of-animal-manures-and-composts-during-composting-and-assessment-of-maturity-indices
#14
Jieying Huang, Zixuan Yu, Hongjian Gao, Xiaoming Yan, Jiang Chang, Chengming Wang, Jingwei Hu, Ligan Zhang
Changes in physicochemical characteristics, chemical structures and maturity of swine, cattle and chicken manures and composts during 70-day composting without addition of bulking agents were investigated. Physicochemical characteristics were measured by routine analyses and chemical structures by solid-state 13C NMR and FT-IR. Three manures were of distinct properties. Their changes in physicochemical characteristics, chemical structures, and maturity were different not only from each other but also from those with addition of bulking agents during composting...
2017: PloS One
https://www.readbyqxmd.com/read/28551535/microbial-community-shifts-in-a-farm-scale-anaerobic-digester-treating-swine-waste-correlations-between-bacteria-communities-associated-with-hydrogenotrophic-methanogens-and-environmental-conditions
#15
Kyungjin Cho, Seung Gu Shin, Woong Kim, Joonyeob Lee, Changsoo Lee, Seokhwan Hwang
Microbial community structure in a farm-scale anaerobic digester treating swine manure was investigated during three process events: 1) prolonged starvation, and changes of 2) operating temperature (between meso- and thermophilic) and 3) hydraulic retention time (HRT). Except during the initial period, the digester was dominated by hydrogenotrophic methanogens (HMs). The bacterial community structure significantly shifted with operating temperature and HRT but not with long-term starvation. Clostridiales (26...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28490754/effect-of-alkaline-microwaving-pretreatment-on-anaerobic-digestion-and-biogas-production-of-swine-manure
#16
Tao Yu, Yihuan Deng, Hongyu Liu, Chunping Yang, Bingwen Wu, Guangming Zeng, Li Lu, Fumitake Nishimura
Microwave assisted with alkaline (MW-A) condition was applied in the pretreatment of swine manure, and the effect of the pretreatment on anaerobic treatment and biogas production was evaluated in this study. The two main microwaving (MW) parameters, microwaving power and reaction time, were optimized for the pretreatment. Response surface methodology (RSM) was used to investigate the effect of alkaline microwaving process for manure pretreatment at various values of pH and energy input. Results showed that the manure disintegration degree was maximized of 63...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28453251/influence-of-manure-application-on-the-environmental-resistome-under-finnish-agricultural-practice-with-restricted-antibiotic-use
#17
Johanna Muurinen, Robert Stedtfeld, Antti Karkman, Katariina Pärnänen, James Tiedje, Marko Virta
The co-occurrence of antibiotic-resistance genes (ARGs) and mobile genetic elements (MGEs) in farm environments can potentially foster the development of antibiotic-resistant pathogens. We studied the resistome of Finnish dairy and swine farms where use of antibiotics is limited to treating bacterial infections and manure is only applied from April to September. The resistome of manure, soil, and tile drainage water from the ditch was investigated from the beginning of the growing season until forage harvest...
June 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28432950/effects-of-chlortetracycline-and-copper-on-tetracyclines-and-copper-resistance-genes-and-microbial-community-during-swine-manure-anaerobic-digestion
#18
Rui Wang, Meixue Chen, Feng Feng, Junya Zhang, Qianwen Sui, Juan Tong, Yuansong Wei, Dongbin Wei
As antibiotic and heavy metals are over used in the livestock industry, animal manure is a reservoir of antibiotic resistance genes (ARGs). Anaerobic digestion has been reported to have the potential to reduce ARGs. However, few studies investigated whether reduction of ARGs would be affected by different external pressures including antibiotics and heavy metals during anaerobic digestion. The purpose of this study was thus to investigate effects of both chlortetracycline (CTC) and Cu on reduction of ARGs, heavy metal resistance genes (HMRGs) and mobile genetic elements (MGEs) during the swine manure anaerobic digestion...
August 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28391921/selected-dark-sides-of-biomass-derived-biochars-as-environmental-amendments
#19
Zien Chen, Lei Luo, Diyi Xiao, Jitao Lv, Bei Wen, Yibing Ma, Shuzhen Zhang
With the rapid increase in the application of biochars as amendments, studies are needed to clarify the possible environmental risks derived from biochars to use safely the biomass resources. This work reported selected dark sides of maize straw- and swine manure-derived biochars pyrolyzed at 300 and 500°C. During the pyrolysis processes, total heavy metals in the biochars were enriched greatly accompanying with considerable emission of the heavy metals into atmosphere and the trends became increasingly obvious with pyrolysis temperature...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28380561/chemical-species-of-phosphorus-and-zinc-in-water-dispersible-colloids-from-swine-manure-compost
#20
Kosuke Yamamoto, Yohey Hashimoto
The release of phosphorus (P) and zinc (Zn) from swine manure compost and from soils applied with swine manure compost can be accelerated by colloidal particles. This study investigated the concentrations and chemical species of P and Zn in water-dispersible colloids (WDCs) collected from swine manure compost by using X-ray absorption fine structure (XAFS) spectroscopy. A filtration and ultracentrifugation process was used to separate and collect WDCs (20-1000 nm) from the bulk swine manure compost (<2 mm)...
March 2017: Journal of Environmental Quality
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