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https://www.readbyqxmd.com/read/28437775/effect-of-nitrification-inhibitors-on-mitigating-n2o-and-no-emissions-from-an-agricultural-field-under-drip-fertigation-in-the-north-china-plain
#1
Di Tian, Yuanyuan Zhang, Yizhen Zhou, Yujing Mu, Junfeng Liu, Chenglong Zhang, Pengfei Liu
N2O and NO emissions from a winter wheat-summer maize rotation field with five different treatments in the North China Plain (NCP) were comparably investigated from 8 October 2014 to 11 October 2015. Compared with the treatments with only flood or drip irrigation, evident emission peaks of N2O and NO from the fertilization treatments with flood irrigation (A-Flood) and with drip fertigation (A-Drip) were observed after each fertilization event, whereas their emissions from the fertilization treatments with nitrification inhibitors under drip fertigation (A+DCD-Drip and A+Nitrapyrin-Drip) were greatly suppressed...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437774/bacterial-community-dynamics-and-functional-variation-during-the-long-term-decomposition-of-cyanobacterial-blooms-in-vitro
#2
Limei Shi, Yaxin Huang, Min Zhang, Yang Yu, Yaping Lu, Fanxiang Kong
Cyanobacterial blooms drastically influence carbon and nutrient cycling in eutrophic freshwater lakes. To understand the mineralization process of cyanobacteria-derived particulate organic matter (CyanPOM), the aerobic degradation of cyanobacterial blooms dominated by Microcystis sp. was investigated over a 95-day microcosm experiment. Approximately 91%, 95% and 83% of the initial particulate organic carbon (POC), particulate organic nitrogen (PON), and particulate organic phosphorus (POP) were decomposed, respectively...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28436685/factors-affecting-the-performance-of-horizontal-flow-constructed-treatment-wetland-vegetated-with-cyperus-papyrus-for-municipal-wastewater-treatment
#3
Sohair I Abou-Elela, Mohamed A Elekhnawy, Magdy T Khalil, Mohamed S Hellal
The effect of hydraulic loading rate (HLR) and hydraulic retention time (HRT) on the bioremediation of municipal wastewater using a pilot scale subsurface horizontal flow constructed treatment wetland (HFCTW) vegetated with Cyprus papyrus was investigated. Three different HLRs were applied to the treatment system namely; 0.18, 0.10 and 0.07 m(3)/m(2). d with corresponding HRTs of 1.8, 3.2 and 4.7 days, respectively. The flow rate was 8 m(3)/ d and the average organic loading rate (OLR) was 0.037 kg BOD/m(3)/d...
April 24, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28433918/chronic-responses-of-aerobic-granules-to-zinc-oxide-nanoparticles-in-a-sequencing-batch-reactor-performing-simultaneous-nitrification-denitrification-and-phosphorus-removal
#4
Qiulai He, Shuxian Gao, Shilu Zhang, Wei Zhang, Hongyu Wang
The reactor performance, granules characteristics and microbial population dynamics were investigated to assess the chronic responses of aerobic granules to zinc oxide nanoparticles (ZnO NPs) of 0, 5, 10 and 20mg/L for a period of 180days. The results showed that ZnO NPs stimulated COD removal, whereas caused inhibition to both nitrification and denitrification. However, biological phosphorus removal remained effective and stable. Introduction of ZnO NPs sharply decreased the respiration of granules, while did not change the settleability...
April 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433913/simultaneous-partial-nitrification-and-2-fluorophenol-biodegradation-with-aerobic-granular-biomass-reactor-performance-and-microbial-communities
#5
Carlos Ramos, Catarina L Amorim, Daniela P Mesquita, Eugénio C Ferreira, Julián Carrera, Paula M L Castro
An aerobic granular bioreactor was operated for over 4months, treating a synthetic wastewater with a high ammonium content (100mgNL(-1)). The inoculum was collected from a bioreactor performing simultaneous partial nitrification and aromatic compounds biodegradation. From day-56 onwards, 2-fluorophenol (2-FP) (12.4mgL(-1)) was added to the feeding wastewater and the system was bioaugmented with a 2-FP degrading bacteria (Rhodococcus sp. FP1). By the end of operation, complete 2-FP biodegradation and partial nitrification were simultaneously achieved...
March 30, 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/28433507/use-of-bioreactor-landfill-for-nitrogen-removal-to-enhance-methane-production-through-ex-situ-simultaneous-nitrification-denitrification-and-in-situ-denitrification
#7
Xiaojie Sun, Hongxia Zhang, Zhaowen Cheng
High concentrations of nitrate-nitrogen (NO3(-)-N) derived from ex situ nitrification phase can inhibit methane production during ex situ nitrification and in situ denitrification bioreactor landfill. A combined process comprised of ex situ simultaneous nitrification-denitrification (SND) in an aged refuse bioreactor (ARB) and in situ denitrification in a fresh refuse bioreactor (FRB) was conducted to reduce the negative effect of high concentrationsof NO3(-)-N. Ex situ SND can be achieved because NO3(-)-N concentration can be reduced and the removal rate of ammonium-nitrogen (NH4(+)-N) remains largely unchanged when the ventilation rate of ARB-A2 is controlled...
April 19, 2017: Waste Management
https://www.readbyqxmd.com/read/28432951/microbial-communities-in-the-functional-areas-of-a-biofilm-reactor-with-anaerobic-aerobic-process-for-oily-wastewater-treatment
#8
Jianhua Li, Shanshan Sun, Ping Yan, Li Fang, Yang Yu, Yangdong Xiang, Di Wang, Yejing Gong, Yanjun Gong, Zhongzhi Zhang
Microbial communities in the functional areas of biofilm reactors with large height-diameter ratio using the anaerobic-aerobic (A/O) reflux process was investigated to treat heavy oil refinery wastewater without pretreatment. In the process, chemical oxygen demand (COD) and total nitrogen (TN) removal reached 93.2% and 82.8%, and the anaerobic biofilm reactor was responsible for 95% and 99%, respectively. Areas for hydrolysis acidification and acetic acid production, methane production, and COD recovery were obvious in the anaerobic reactor...
April 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28426987/a-review-on-nitrous-oxide-n2o-emissions-during-biological-nutrient-removal-from-municipal-wastewater-and-sludge-reject-water
#9
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/28425288/tracking-nitrogen-sources-transformation-and-transport-at-a-basin-scale-with-complex-plain-river-networks
#10
Qitao Yi, Qiuwen Chen, Liuming Hu, Wenqing Shi
This research developed an innovative approach to reveal nitrogen sources, transformation and transport in large and complex river networks in the Taihu Lake basin using measurement of dual stable isotopes of nitrate. The spatial patterns of δ15N corresponded to the urbanization level, and the nitrogen cycle was associated with the hydrological regime at the basin level. During the high flow season of summer, nonpoint sources from fertilizer/soils and atmospheric deposition constituted the highest proportion of the total nitrogen load...
April 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28419436/ammonia-oxidizer-populations-vary-with-nitrogen-cycling-across-a-tropical-montane-mean-annual-temperature-gradient
#11
S Pierre, I Hewson, J P Sparks, C M Litton, C Giardina, P M Groffman, T J Fahey
Functional gene approaches have been used to better understand the roles of microbes in driving forest soil nitrogen (N) cycling rates and bioavailability. Ammonia oxidation is a rate limiting step in nitrification, and is a key area for understanding environmental constraints on N availability in forests. We studied how increasing temperature affects the role of ammonia oxidizing archaea (AOA) and bacteria (AOB) in soil N cycling and availability by using a highly constrained natural mean annual temperature (MAT) elevation gradient in a tropical montane wet forest...
April 18, 2017: Ecology
https://www.readbyqxmd.com/read/28419127/effects-of-nitrogen-application-rate-nitrogen-synergist-and-biochar-on-nitrous-oxide-emissions-from-vegetable-field-in-south-china
#12
Qiong Yi, Shuanghu Tang, Xiaolin Fan, Mu Zhang, Yuwan Pang, Xu Huang, Qiaoyi Huang
Globally, vegetable fields are the primary source of greenhouse gas emissions. A closed-chamber method together with gas chromatography was used to measure the fluxes of nitrous oxide (N2O) emissions in typical vegetable fields planted with four vegetables sequentially over time in the same field: endive, lettuce, cabbage and sweet corn. Results showed that N2O fluxes occurred in pulses with the N2O emission peak varying greatly among the crops. In addition, N2O emissions were linearly associated with the nitrogen (N) application rate (r = 0...
2017: PloS One
https://www.readbyqxmd.com/read/28409429/multivariate-statistical-assessment-of-a-polluted-river-under-nitrification-inhibition-in-the-tropics
#13
Thi Thu Huyen Le, Stephanie Zeunert, Malte Lorenz, Günter Meon
A large complex water quality data set of a polluted river, the Tay Ninh River, was evaluated to identify its water quality problems, to assess spatial variation, to determine the main pollution sources, and to detect relationships between parameters. This river is highly polluted with organic substances, nutrients, and total iron. An important problem of the river is the inhibition of the nitrification. For the evaluation, different statistical techniques including cluster analysis (CA), discriminant analysis (DA), and principal component analysis (PCA) were applied...
April 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28406061/effect-of-packing-material-on-organic-matter-removal-efficiency-in-an-anaerobic-aerobic-baffled-bioreactor
#14
Jacobo Tabla-Hernandez, E Lopez-Galvan
The aim of the present work was to study the effect of packing material on the organic matter removal efficiency (OMRE) in an anaerobic-aerobic baffled bioreactor (AAB). For this purpose, two different experiments were conducted with two types of packing material: activated carbon particles (AC) and polyurethane foam (PF). The system consisted of two treatments; the first one was anaerobic, where it took place hydrolysis, acetogenesis and methanogenesis. In anaerobic chambers, there were no packing material and the operating conditions were the same in both experiments...
April 13, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28402313/effects-of-carbon-sources-cod-no2-n-ratios-and-temperature-on-the-nitrogen-removal-performance-of-the-simultaneous-partial-nitrification-anammox-and-denitrification-snad-biofilm
#15
Zhaoming Zheng, Yun Li, Jun Li, Yanzhuo Zhang, Wei Bian, Jia Wei, Baihang Zhao, Jingyue Yang
The aim of the present work was to evaluate the effects of carbon sources and chemical oxygen demand (COD)/NO2(-)-N ratios on the anammox-denitrification coupling process of the simultaneous partial nitrification, anammox and denitrification (SNAD) biofilm. Also, the anammox activities of the SNAD biofilm were investigated under different temperature. Kaldnes rings taken from the SNAD biofilm reactor were operated in batch tests to determine the nitrogen removal rates. As a result, with the carbon source of sodium acetate, the appropriate COD/NO2(-)-N ratios for the anammox-denitrification coupling process were 1 and 2...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28399822/dominant-bacterial-phyla-in-caves-and-their-predicted-functional-roles-in-c-and-n-cycle
#16
Surajit De Mandal, Raghunath Chatterjee, Nachimuthu Senthil Kumar
BACKGROUND: Bacteria present in cave often survive by modifying their metabolic pathway or other mechanism. Understanding these adopted bacteria and their survival strategy inside the cave is an important aspect of microbial ecology. Present study focuses on the bacterial community and geochemistry in five caves of Mizoram, Northeast India. The objective of this study was to explore the taxonomic composition and presumed functional diversity of cave sediment metagenomes using paired end Illumina sequencing using V3 region of 16S rRNA gene and bioinformatics pipeline...
April 11, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28394701/nitrogen-removal-and-its-relationship-with-the-nitrogen-cycle-genes-and-microorganisms-in-the-horizontal-subsurface-flow-constructed-wetlands-with-different-design-parameters
#17
Jun Chen, Guang-Guo Ying, You-Sheng Liu, Xiao-Dong Wei, Shuang-Shuang Liu, Liang-Ying He, Yong-Qiang Yang, Fan-Rong Chen
This study aims to investigate nitrogen removal and its relationship with the nitrogen-cycle genes and microorganisms in the horizontal subsurface flow constructed wetlands (CWs) with different design parameters. Twelve mesocosm-scale CWs with four substrates and three hydraulic loading rates were set up in the outdoor. The result showed the CWs with zeolite as substrate and HLR of 20 cm/d were selected as the best choice for the TN and NH3-N removal. It was found that the single-stage mesocosm-scale CWs were incapable to achieve high removals of TN and NH3-N due to inefficient nitrification process in the systems...
April 10, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28394206/nitrification-denitrification-and-dephosphatation-capability-of-activated-sludge-during-co-treatment-of-intermediate-age-landfill-leachates-with-municipal-wastewater
#18
S Fudala-Ksiazek, E Kulbat, A Luczkiewicz
This study focuses on the possible use and efficacy of the co-treatment of landfill leachate (intermediate-age) with municipal wastewater. The nitrification, denitrification and dephosphatation capability of activated sludge acclimated with a mixture of raw municipal wastewater (RWW) with gradually increasing amounts of raw landfill leachate (RLL) (from 0.5 to 5% v/v) were tested. Biochemical tests were performed simultaneously in batch reactors (BRs). According to the obtained data, the ammonia utilization rate (AUR) was 3...
April 10, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28394116/improvement-of-soil-ecosystem-multifunctionality-by-dissipating-manure-induced-antibiotics-and-resistance-genes
#19
Yuting Liang, Meng Pei, Dandan Wang, Shengnan Cao, Xian Xiao, Bo Sun
The application of animal manure containing antibiotic residues to farmlands as an organic fertilizer causes a long-term potential threat to the ecological environment of farmland. This study analyzed the effects of abating typical antibiotics and resistance genes (ARGs) applied with pig manure on farmland soil as well as on soil ecosystem multifunctionality (EMF) and its influencing factor. The results showed that Lolium multiflorum exhibited significantly stronger abatement of typical antibiotics and ARGs when combined with biochar than when used alone (p < 0...
April 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28391700/effect-of-water-chemistry-and-hydrodynamics-on-nitrogen-transformation-activity-and-microbial-community-functional-potential-in-hyporheic-zone-sediment-columns
#20
Yuanyuan Liu, Chongxuan Liu, William C Nelson, Liang Shi, Fen Xu, Yunde Liu, Ailan Yan, Lirong Zhong, Christopher Thompson, James K Fredrickson, John M Zachara
Hyporheic zones (HZ) are active biogeochemical regions where groundwater and surface water mix. N transformations in HZ sediments were investigated in columns with a focus on understanding how the dynamic changes in groundwater and surface water mixing affect microbial community and its biogeochemical function with respect to N transformations. The results indicated that denitrification, DNRA, and nitrification rates and products changed quickly in response to changes in water and sediment chemistry, fluid residence time, and groundwater-surface water exchange...
April 18, 2017: Environmental Science & Technology
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