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1. Analysis of anthropogenic nitrogen and its influencing factors in Beijing

Author:
Zhang, Xiaolin; Zhang, Yan; Fath, Brian D.
Source:
Journal of cleaner production 2020 v.244 pp. 118780
ISSN:
0959-6526
Subject:
nitrogen; nitrogen content; nitrogen cycle,   etc   ; cities; energy; models; nitrogen fertilizers; socioeconomic factors; urban development; China;     Show all 10 Subjects
Abstract:
... Human activities have changed the global nitrogen cycle and are continuing to do so at an alarming rate. Cities are particularly important nitrogen sinks due to the concentration of human activities, and have attracted widespread attention. However, researchers disagree about the sink size and the underlying socioeconomic factors. Taking Beijing as an example, we developed an anthropogenic nitroge ...
DOI:
10.1016/j.jclepro.2019.118780

2. Role of soluble microbial product as an intermediate electron station linking C/N and nitrogen removal performance in sequencing batch reactor

Author:
Zhang, Xuening; Sun, Yilu; Ma, Fang; Li, Ang; Yang, Jixian
Source:
Environmental research 2020 v.183 pp. 109248
ISSN:
0013-9351
Subject:
carbon nitrogen ratio; nitrogen,   etc   ; batch systems; denitrification; wastewater; wastewater treatment;     Show all 6 Subjects
Abstract:
... The C/N ratio in wastewater differs in place and time and affects the nitrogen removal performance of wastewater treatment. However, studies have focused only on the direct relationship between C/N and nitrogen removal efficiency but disregarded the significant role of soluble microbial products (SMPs) as an intermediate electron station. In this work, the contribution of SMPs to TN removal for tr ...
DOI:
10.1016/j.envres.2020.109248

3. Integrating stereo-elastic packing into ecological floating bed for enhanced denitrification in landscape water

Author:
Song, Jia; Li, Qian; Dzakpasu, Mawuli; Wang, Xiaochang C.; Chang, Nini
Source:
Bioresource technology 2020 v.299 pp. 122601
ISSN:
0960-8524
Subject:
nitrite nitrogen; nitrogen,   etc   ; Gemmobacter; Hyphomicrobium; biomass; denitrification; landscapes; sediments;     Show all 8 Subjects
Abstract:
... The effects of stereo-elastic packing, as additional bio-carriers, on nitrogen removal in enhanced ecological floating beds (EFBs) are evaluated. Enhanced EFBs with additional stereo-elastic packing was demonstrated to enhance maximum TN removal efficiency (65.8%) over that of EFBs with plant and ceramisite only (54.9%). Performance enhancement was attributable to a 40.6% increase in sediment N ac ...
DOI:
10.1016/j.biortech.2019.122601

4. Assessment of iron-modified calcite/zeolite mixture as a capping material to control sedimentary phosphorus and nitrogen liberation

Author:
Zhan, Yanhui; Yu, Yang; Lin, Jianwei; Wu, Xiaolong; Wang, Yan; Zhao, Yuying
Source:
Environmental science and pollution research international 2020 v.27 no.4 pp. 3962-3978
ISSN:
0944-1344
Subject:
ammonium nitrogen; nitrogen,   etc   ; calcite; films (materials); phosphorus; sediments; zeolites;     Show all 7 Subjects
Abstract:
... Calcite/zeolite mixture (CZ) can be used to construct a capping layer for the simultaneous management of phosphorus (P) and nitrogen (N) liberation from sediments into the overlying water (OVER-water). However, its control efficiency of sedimentary P release still needs to be improved. To address this issue, an iron-modified CZ (Fe-CZ) was synthesized, characterized, and employed as a capping mate ...
DOI:
10.1007/s11356-019-06955-5

5. Ten years of progress in the synthesis of six-membered N-heterocycles from alkynes and nitrogen sources

Author:
Neto, José Sebastião Santos; Zeni, Gilson
Source:
Tetrahedron 2020 v.76 no.4 pp. 130876
ISSN:
0040-4020
Subject:
heterocyclic nitrogen compounds; nitrogen,   etc   ; alkynes; chemical reactions; chemical structure;     Show all 5 Subjects
Abstract:
... The purpose of this review is to highlight ten years of success in the synthesis of six-membered N-heterocycles using alkynes and nitrogen sources as substrates. It is our hope summarizing these methods would be very useful for the chemists who are interested in the synthesis of heterocycles. ...
DOI:
10.1016/j.tet.2019.130876

6. Correction to: Modeling the temporal distribution of water, ammonium-N, and nitrate-N in the root zone of wheat using HYDRUS-2D under conservation agriculture

Author:
Shafeeq, Poomadathil Mohammed; Aggarwal, Pramila; Krishnan, Prameela; Rai, Vikas; Pramanik, Pragati; Das, Tapas Kumar
Source:
Environmental science and pollution research international 2020 v.27 no.2 pp. 2217-2225
ISSN:
0944-1344
Subject:
ammonium nitrogen; nitrate nitrogen,   etc   ; agricultural conservation practice; models; rhizosphere; wheat;     Show all 6 Subjects
Abstract:
... The original publication of this paper contains a mistake. ...
DOI:
10.1007/s11356-019-07225-0

7. Effect of intermittent aeration mode on nitrogen concentration in the water column and sediment pore water of aquaculture ponds

Author:
Zhu, Dantong; Cheng, Xiangju; Sample, David J.; Yazdi, Mohammad Nayeb
Source:
Journal of environmental sciences (China) 2020 v.90 pp. 331-342
ISSN:
1001-0742
Subject:
ammonium nitrogen; nitrate nitrogen; nitrite nitrogen,   etc   ; aeration; animal growth; aquaculture; dissolved oxygen; energy; nitrogen; ponds; sediments; tanks; water quality;     Show all 13 Subjects
Abstract:
... Nitrogen in pond sediments is a major water quality concern and can impact the productivity of aquaculture. Dissolved oxygen is an important factor for improving water quality and boosting fish growth in aquaculture ponds, and plays an important role in the conversion of ammonium-nitrogen (NH₄⁺-N) to nitrite-nitrogen (NO₂⁻-N) and eventually nitrate-nitrogen (NO₃⁻-N). A central goal of the study wa ...
DOI:
10.1016/j.jes.2019.11.022

8. Effects of rainfall amount and frequency on soil nitrogen mineralization in Zoigê alpine wetland

Author:
Zhang, Xiao-Ya; Li, Qian-Wei; Gao, Jun-Qin; Hu, Yi-Heng; Song, Ming-Hua; Yue, Yi
Source:
European journal of soil biology 2020 v.97 pp. 103170
ISSN:
1164-5563
Subject:
ammonium nitrogen; nitrate nitrogen; nitrogen,   etc   ; climate change; drought; ecosystems; field experimentation; mineralization; nitrogen cycle; rain; soil depth; wetlands;     Show all 12 Subjects
Abstract:
... Changes in rainfall patterns can affect the soil nitrogen (N) cycles. Most studies have focused on the effect of the amount of rainfall, but the effect of the frequency of rainfall has rarely been considered. In this study, we conducted a field experiment in the Zoigê alpine wetland that examined two levels of the amount of rainfall, i.e. 100% or 70% of the natural amounts of rainfall. In addition ...
DOI:
10.1016/j.ejsobi.2020.103170

9. Recovery behavior of high ammonium inhibition in a sequencing batch biofilm reactor

Author:
Wang, Qian; Chao, Chunfang; Zhao, Yingxin
Source:
Bioresource technology reports 2020 v.9 pp. 100315
ISSN:
2589-014X
Subject:
ammonium nitrogen; nitrate nitrogen; nitrite nitrogen,   etc   ; algae; ammonium; biofilm; chemical oxygen demand; total nitrogen; total phosphorus; wastewater;     Show all 10 Subjects
Abstract:
... Few studies have investigated the process of microbial recovery in wastewater inhibited by high-strength ammonium but focused on the inhibition effects only. In this study, one contrast way and four efficient ways were developed and applied to five parallel sequencing batch biofilm reactors (SBBRs). The effluent ammonia nitrogen (NH₄⁺-N), nitrite nitrogen (NO₂⁻-N), nitrate nitrogen (NO₃⁻-N), total ...
DOI:
10.1016/j.biteb.2019.100315

10. High-Angular-Momentum Orbitals and Superatomic Characteristics of Boron-Nitrogen Cages

Author:
Xie, Weiyu; Wang, Jia; Wang, Jianpeng; Wu, Xiaochen; Wang, Zhigang; Zhang, Rui-Qin
Source:
Journal of physical chemistry 2020 v.124 no.6 pp. 3881-3885
ISSN:
1932-7455
Subject:
nitrogen,   etc   ; boron; chemical structure; electrons;     Show all 4 Subjects
Abstract:
... The functional structures at the nanoscale containing high-angular-momentum (HAM) electrons possess wide potential applications. However, HAM electrons generally exist in high-Z elements, while the related materials are difficult to obtain through either mining or synthesis. Therefore, it is significant to design new materials building blocks to mimic the electronic properties of high-Z elements. ...
DOI:
10.1021/acs.jpcc.9b11351

11. The simultaneous antibiotics and nitrogen removal in vertical flow constructed wetlands: Effects of substrates and responses of microbial functions

Author:
Yuan, Yingrui; Yang, Baoshan; Wang, Hui; Lai, Xiaoshuang; Li, Feng; Salam, Mir Md Abdus; Pan, Fuxia; Zhao, Yuqiang
Source:
Bioresource technology 2020 v.310 pp. 123419
ISSN:
0960-8524
Subject:
ammonium nitrogen; nitrate nitrogen; nitrogen,   etc   ; antibiotics; biochar; ciprofloxacin; constructed wetlands; manganese; resistance genes; sulfamethazine; wastewater; zeolites;     Show all 12 Subjects
Abstract:
... A vertical flow constructed wetland (VFCW) packed with the different substrates was designed to remediate the antibiotics in the wastewater. Zeolite (CW-Z) paralleled with Manganese (Mn) ore (CW-M) and biochar (CW-C) were used to enhance the synchronous removal of ciprofloxacin hydrochloride (CIPH), sulfamethazine (SMZ) and nitrogen (N) from the wastewater. The result indicated that CW-M had a sig ...
DOI:
10.1016/j.biortech.2020.123419

12. Impact of exogenous nitrogen on the cyanobacterial abundance and community in oil-contaminated sediment: A microcosm study

Author:
Wang, Haixia; Li, Hanbo; Sun, Kaikai; Huang, Hui; Zhu, Panpan; Lu, Zhenmei
Source:
The Science of the total environment 2020 v.710 pp. 136296
ISSN:
0048-9697
Subject:
nitrogen; nitrogen fixation; nitrogen-fixing cyanobacteria,   etc   ; Cyanobacteria; algae; nutrients; oil spills; oils; plankton; pollution; sediments;     Show all 11 Subjects
Abstract:
... The pollution caused by oil spills is a global problem, and outbreaks of blue algae in oil-polluted areas are harmful to plankton in the ocean. The ocean is a barren environment limited by low availabilities of nitrogen and other nutrients, and further nitrogen limitation caused by oil contamination is considered one of the important factors leading to outbreaks of cyanobacteria, but the effects o ...
DOI:
10.1016/j.scitotenv.2019.136296

13. A Model for Nitrogen Fixation in Cereal Crops

Author:
Bennett, Alan B.; Pankievicz, Vânia C.S.; Ané, Jean-Michel
Source:
Trends in plant science 2020 v.25 no.3 pp. 226-235
ISSN:
1360-1385
Subject:
nitrogen; nitrogen fixation; nitrogen-fixing bacteria,   etc   ; corn; grain crops; indigenous species; landraces; models; mucilages; roots; soil;     Show all 11 Subjects
Abstract:
... Nitrogen-fixing microbial associations with cereals have been of intense interest for more than a century (Roesch et al., Plant Soil 2008;302:91–104; Triplett, Plant Soil 1996;186:29–38; Mus et al., Appl. Environ. Microbiol. 2016;82:3698–3710; Beatty and Good, Science 2011;333:416–417). A recent report demonstrated that an indigenous Sierra Mixe maize landrace, characterized by an extensive develo ...
DOI:
10.1016/j.tplants.2019.12.004

14. Microalgae-based nitrogen bioremediation

Author:
Chen, Hui; Wang, Qiang
Source:
Algal research 2020 v.46 pp. 101775
ISSN:
2211-9264
Subject:
ammonium nitrogen; nitrogen; nitrogen oxides,   etc   ; air; algae culture; bioremediation; biotransformation; human health; microalgae; pollutants; pollution; wastewater;     Show all 12 Subjects
Abstract:
... Pollution poses an increasing threat to the environment and to human health. Nitrogen pollution is of great concern, with nitrogen oxide (NOx) in the air and ammonia nitrogen in water being two major pollutants. Culturing microalgae in NOx or wastewater with high concentrations of ammonia nitrogen would both reduce environmental pollution and provide a source of nitrogen for microalgal culture. Ho ...
DOI:
10.1016/j.algal.2019.101775

15. Enhanced simultaneous nitrification and denitrification performance in a fixed-bed system packed with PHBV/PLA blends

Author:
Sun, Haimeng; Yang, Zhongchen; Yang, Feifei; Wu, Weizhong; Wang, Jianlong
Source:
International biodeterioration & biodegradation 2020 v.146 pp. 104810
ISSN:
0964-8305
Subject:
ammonium nitrogen; carbon nitrogen ratio; nitrate nitrogen,   etc   ; biofilm; carbon; denitrification; nitrification; polylactic acid; sewage treatment; wastewater;     Show all 10 Subjects
Abstract:
... In the present study, simultaneous nitrification and denitrification of sewage treatment plant effluent was evaluated using an up-flow fixed-bed system packed with poly (3-hydroxybutyrate-hydroxyvalerate)/polylactide (PHBV/PLA) blends used in a dual role as carbon source and biofilms carrier. 98.1 ± 2.9% and 87.2 ± 6.8% of influent NH4+-N and NO3−-N was removed from the synthetic wastewater. TN re ...
DOI:
10.1016/j.ibiod.2019.104810

16. Surface soil mixing is more beneficial than the plough layer mixing mode of biochar application for nitrogen retention in a paddy system

Author:
Lu, Haiying; Feng, Yuanyuan; Gao, Qian; Xing, Jincheng; Chen, Yudong; Yang, Linzhang; Xue, Lihong
Source:
The Science of the total environment 2020 v.718 pp. 137399
ISSN:
0048-9697
Subject:
ammonium nitrogen; nitrate nitrogen; nitrogen,   etc   ; biochar; fertilizers; grain yield; mixing; nitrogen retention; paddies; paddy soils; rice; risk reduction; soil amendments; surface water; total nitrogen;     Show all 15 Subjects
Abstract:
... The benefits of biochar as a soil amendment have been investigated extensively, but few studies have considered the effects of different application modes on nitrogen (N) dynamics. In the present study, a pot experiment was conducted to evaluate the effects of two different biochar application modes [plough layer mixing (PLM) and surface soil mixing (SSM)] on the N dynamics in a paddy system. It w ...
DOI:
10.1016/j.scitotenv.2020.137399

17. Effects of carbohydrate addition strategy and biofloc levels on the establishment of nitrification in biofloc technology aquaculture systems

Author:
Luo, Guozhi; Chen, Xiaoqing; Tan, Jinghong; Abakari, Godwin; Tan, Hongxin
Source:
Aquaculture 2020 v.514 pp. 734441
ISSN:
0044-8486
Subject:
ammonium nitrogen; carbon nitrogen ratio; nitrate nitrogen,   etc   ; Nitrospirae; aquaculture systems; bacteria; bacterial communities; biofloc technology; community structure; denitrification; dissolved organic carbon; glucose; lactones; nitrification; nitrite nitrogen; nitrogen dioxide;     Show all 16 Subjects
Abstract:
... The current study evaluated the effect of a carbohydrate addition strategy set at two biofloc levels on the establishment of nitrification in new biofloc technology aquaculture systems. Three carbohydrate addition strategies were chosen as follows: one-time glucose addition with 20:1 of the input C/N ratio, glucose additions at a C/N ratio of 20:1 when total ammonia nitrogen (TAN) > 2 mg/L, and on ...
DOI:
10.1016/j.aquaculture.2019.734441

18. Nitrogen fertilizer and Amorpha fruticosa leguminous shrub diversely affect the diazotroph communities in an artificial forage grassland

Author:
Xiao, Dan; Liu, Xin; Yang, Rong; Tan, Yongjun; Zhang, Wei; He, Xunyang; Xu, Zhihong; Wang, Kelin
Source:
The Science of the total environment 2020 v.711 pp. 134967
ISSN:
0048-9697
Subject:
ammonium nitrogen; dissolved organic nitrogen; nitrate nitrogen,   etc   ; Amorpha fruticosa; Cenchrus purpureus; agroecosystems; community structure; fertilizer application; forage grasses; grasslands; hybrids; interspecific competition; karsts; legumes; nitrogen fertilizers; nitrogen fixation; nitrogen-fixing bacteria; pH; planting; shrubs; soil properties; China;     Show all 22 Subjects
Abstract:
... Soil diazotrophs have been known to be essential in biological nitrogen (N) fixation, which contributes to the sustainability of agricultural ecosystems. However, there remains an inadequacy of research on the effects of different N inputs from N fertilization and from symbiotic N fixation associated with legumes on the diazotroph communities in agricultural ecosystems. Hence, we investigated the ...
DOI:
10.1016/j.scitotenv.2019.134967

19. Responses of microbial structures, functions, metabolic pathways and community interactions to different C/N ratios in aerobic nitrification

Author:
Sun, Hongwei; Shi, Wenyan; Cai, Chenjian; Ge, Shijian; Ma, Bin; Li, Xiaoqiang; Ding, Jing
Source:
Bioresource technology 2020 v.311 pp. 123422
ISSN:
0960-8524
Subject:
carbon nitrogen ratio; nitrogen; total nitrogen,   etc   ; Nitrosomonas; Zoogloea; ammonia; ammonia monooxygenase; bacteria; biochemical pathways; biomarkers; ecological communities; nitrification; sludge;     Show all 13 Subjects
Abstract:
... The responses of microbial structures, functional profiles and metabolic pathways during nitrification to four C/N ratios (0, 5, 10 and 15) were investigated in four parallel SBRs denoted as S₀, S₅, S₁₀, S₁₅. Results indicated that microbial diversities were affected by C/N ratios, while the same dominant taxa were observed, mainly including Proteobacteria, Betaproteobacteria, Rhodocyclales, Rhodo ...
DOI:
10.1016/j.biortech.2020.123422

20. Plant diversity improves the effluent quality and stability of floating constructed wetlands under increased ammonium/nitrate ratio in influent

Author:
Wang, Xiao; Luo, Bin; Wang, Lichunxiao; Zhao, Yu; Wang, Qian; Li, Dan; Gu, Baojing; Min, Yong; Chang, Scott X.; Ge, Ying; Chang, Jie
Source:
Journal of environmental management 2020 v.266 pp. 110607
ISSN:
0301-4797
Subject:
ammonium nitrogen; nitrate nitrogen; nitrogen,   etc   ; Phragmites australis; Typha latifolia; ammonium; constructed wetlands; nitrates; species richness; wastewater treatment; water quality;     Show all 11 Subjects
Abstract:
... The major targets of constructed wetlands (CWs) during wastewater treatment include achieving high-quality effluent and maintaining stable effluent quality. Plant species diversity can increase nitrogen (N) removal efficiency and improve effluent quality by decreasing the effluent N concentrations, including nitrate (NO₃⁻-N), ammonium (NH₄⁺-N) and total inorganic nitrogen (TIN) concentrations in C ...
DOI:
10.1016/j.jenvman.2020.110607