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1. Nitrogen limitation affects the sinking property of Microcystis by promoting carbohydrate accumulation

Author:
Huang, Yingying; Hong, Jingjie; Liang, Chengyu; Li, Gengyang; Shen, Lin; Zhang, Haichun; Hu, Xiongxing; Chen, Xuechu
Source:
Chemosphere 2019 v.221 pp. 665-671
ISSN:
0045-6535
Subject:
nitrate nitrogen,   etc   ; Microcystis; autumn; carbohydrate content; carbohydrates; lakes; nitrogen; summer;     Show all 8 Subjects
Abstract:
... Nitrogen limitation has been proven to inhibit Microcystis proliferation, and the significant decline in Microcystis blooms in late summer or autumn has been considered to be related to the nitrogen depletion in water. Sinking loss is another factor that influences the dynamics of cyanobacteria in lakes. However, to date, it is still unclear how the sinking property of Microcystis responds to nitr ...
DOI:
10.1016/j.chemosphere.2019.01.080

2. Mapping Aquifer Vulnerability Indices Using Artificial Intelligence-running Multiple Frameworks (AIMF) with Supervised and Unsupervised Learning

Author:
Nadiri, AtaAllah; Gharekhani, Maryam; Khatibi, Rahman
Source:
Water resources management 2018 v.32 no.9 pp. 3023-3040
ISSN:
0920-4741
Subject:
nitrate nitrogen,   etc   ; aquifers; support vector machines;     Show all 3 Subjects
Abstract:
... DRASTIC-based vulnerability indices and their variations for an aquifer are investigated in this paper, each of which is regarded as a framework since their rationale of using seven DRASTIC data layers is consensual and lacks empirical or theoretical formulations. The Basic DRASTIC framework (BDF) is implemented by a set of prescribed rules; whereas its three variations involve unsupervised learni ...
DOI:
10.1007/s11269-018-1971-z

3. The critical utilization of active heterotrophic microalgae for bioremoval of Cr(VI) in organics co-contaminated wastewater

Author:
Shen, Liang; Saky, Shaila Akter; Yang, Zheng; Ho, Shih-Hsin; Chen, Cuixue; Qin, Lei; Zhang, Guoliang; Wang, Yuanpeng; Lu, Yinghua
Source:
Chemosphere 2019 v.228 pp. 536-544
ISSN:
0045-6535
Subject:
nitrate nitrogen,   etc   ; biochemical pathways; biomass; chromium; ethanol; methanol; microalgae; pollutants; sodium acetate; toxicity; wastewater;     Show all 11 Subjects
Abstract:
... Considering the importance of removing toxic Cr(VI) from practical wastewater containing complex pollutants, this study presented for the first time the utilization of the live heterotrophic microalgae (Botryocossuss sp. NJD-1) to achieve a concurrent abatement of Cr(VI), TOC, NO3-N and PO4-P, through a comprehensive biochemical process. The experimental results showed that the Cr(VI) removal effi ...
DOI:
10.1016/j.chemosphere.2019.04.152

4. Springs drive downstream nitrate export from artificially-drained agricultural headwater catchments

Author:
Goeller, Brandon C.; Febria, Catherine M.; Warburton, Helen J.; Hogsden, Kristy L.; Collins, Kathryn E.; Devlin, Hayley S.; Harding, Jon S.; McIntosh, Angus R.
Source:
The Science of the total environment 2019 v.671 pp. 119-128
ISSN:
0048-9697
Subject:
nitrate nitrogen,   etc   ; groundwater; nitrates; pollution load; runoff; springs (water); water quality; watersheds; waterways; wet season;     Show all 10 Subjects
Abstract:
... Excessive nutrient loading from small agricultural headwaters can substantially degrade downstream water quality and ecological conditions. But, our understanding of the scales and locations to implement nutrient attenuation tools within these catchments is poor. To help inform farm- and catchment-scale management, we quantified nitrate export in nine one-kilometre-long lowland agricultural headwa ...
DOI:
10.1016/j.scitotenv.2019.03.308

5. Nutritional changes in petiole sap over space and time in a tomato crop greenhouse

Author:
Llanderal, Alfonso; García-Caparrós, Pedro; Segura, María L.; Contreras, Juana I.; Lao, María T.
Source:
Journal of plant nutrition 2019 v.42 no.10 pp. 1205-1217
ISSN:
1532-4087
Subject:
nitrate nitrogen,   etc   ; calcium; greenhouses; magnesium; nutrients; petioles; phenology; potassium; sap; sodium; temporal variation; tomatoes;     Show all 12 Subjects
Abstract:
... The aims of this trial were to determine the spatial and temporal variability of the nutrients in petiole sap in a tomato crop under greenhouse and to determine the number of sub-samples for a representative sample. The experiment consisted of the selection of 20 sampling points. Petiole of fully expanded leaf was collected weekly in order to determine Cl, NO₃-N, H₂PO₄-P, SO₄-S, Na, K, Ca and Mg c ...
DOI:
10.1080/01904167.2019.1609504

6. Impact of hydraulic residence time on nitrate removal in pilot-scale woodchip bioreactors

Author:
Martin, E.A.; Davis, M.P.; Moorman, T.B.; Isenhart, T.M.; Soupir, M.L.
Source:
Journal of environmental management 2019 v.237 pp. 424-432
ISSN:
0301-4797
Subject:
nitrate nitrogen,   etc   ; bioreactors; greenhouse gas emissions; nitrates; rowcrops; tile drainage; water quality; wood chips; Iowa;     Show all 9 Subjects
Abstract:
... Nitrate (NO3−N) export from row crop agricultural systems with subsurface tile drainage continues to be a major water quality concern. Woodchip bioreactors are an effective edge-of-field practice designed to remove NO3−N from tile drainage. The NO3−N removal rate of woodchip bioreactors can be impacted by several factors, including hydraulic residence time (HRT). This study examined the impact of ...
DOI:
10.1016/j.jenvman.2019.01.025

7. Nutrient removal through pyrrhotite autotrophic denitrification: Implications for eutrophication control

Author:
Zhang, Yongwei; Wei, Dongyang; Morrison, Liam; Ge, Zhibin; Zhan, Xinmin; Li, Ruihua
Source:
The Science of the total environment 2019 v.662 pp. 287-296
ISSN:
0048-9697
Subject:
nitrate nitrogen,   etc   ; Thiobacillus; bacteria; biofilters; denitrification; eutrophication; microbial communities; nitrates; phosphates; temperature; wastewater;     Show all 11 Subjects
Abstract:
... This study investigated nutrient removal kinetics and main influencing factors of natural pyrrhotite autotrophic denitrification (PAD), and nutrient removal performance and the microbial community in the PAD biofilter (PADB). Results demonstrated that both NO3− and PO43− in wastewater were nearly completely removed, and biological N removal and chemical P removal took place simultaneously in the P ...
DOI:
10.1016/j.scitotenv.2019.01.230

8. Groundwater DRASTIC Vulnerability Mapping by Unsupervised and Supervised Techniques Using a Modelling Strategy in Two Levels

Author:
Nadiri, Ata Allah; Norouzi, Hossein; Khatibi, Rahman; Gharekhani, Maryam
Source:
Journal of hydrology 2019
ISSN:
0022-1694
Subject:
nitrate nitrogen,   etc   ; aquifers; fertilizers; groundwater; models; risk assessment; support vector machines; water quality;     Show all 8 Subjects
Abstract:
... Production of defensible modelling tools for aquifer vulnerability mapping under the conditions of sparse data remains topical using the DRASTIC framework. DRASTIC is the acronym for seven data layers using a prescribed scoring systems in terms of rates to account for local variations and weights to account for the relative importance of data layers. Also, a framework underpins the consensual natu ...
DOI:
10.1016/j.jhydrol.2019.04.039

9. Nitrate N influences the accumulations and subcellular distributions of Cd and Zn to mediate the Cd/Zn interactions in dwarf Polish Wheat (Triticum polonicum L.) seedlings

Author:
Wang, Xiaolu; Cheng, Yiran; Shuai, Wendi; Zeng, Jian; Kang, Houyang; Fan, Xing; Sha, Lina; Zhang, Haiqin; Wang, Yi; Zhou, Yonghong
Source:
Soil science and plant nutrition 2019 v.65 no.2 pp. 137-147
ISSN:
1747-0765
Subject:
nitrate nitrogen,   etc   ; Triticum; cadmium; genes; messenger RNA; nitrates; roots; seedlings; shoots; vacuoles; wheat; zinc;     Show all 12 Subjects
Abstract:
... Nitrate (NO₃–) assimilation and transport play important roles in Cd transport. Transcript profiling indicated that several NO₃⁻ metabolism-related genes were involved in Cd/Zn interactions in roots of dwarf Polish Wheat (DPW). In this study, the effects of NO₃⁻ on Cd and Zn accumulations and subcellular distributions in DPW under Cd, Zn, and Cd + Zn applications with lack or supply of NO₃⁻ were i ...
DOI:
10.1080/00380768.2018.1559705

10. Identification of the pollutants’ removal and mechanism by microalgae in saline wastewater

Author:
Vo, Hoang Nhat Phong; Ngo, Huu Hao; Guo, Wenshan; Liu, Yiwen; Chang, Soon Woong; Nguyen, Dinh Duc; Nguyen, Phuoc Dan; Bui, Xuan Thanh; Ren, Jiawei
Source:
Bioresource technology 2019 v.275 pp. 44-52
ISSN:
0960-8524
Subject:
nitrate nitrogen,   etc   ; Chlorella vulgaris; biomass production; freshwater; microalgae; phosphates; pollutants; salinity; wastewater;     Show all 9 Subjects
Abstract:
... This study investigated the growth dynamics of a freshwater and marine microalgae with supported biochemical performance in saline wastewater, the pollutants assimilation by a developed method, and the mechanism of salinity’s effect to pollutants assimilation. Maximal biomass yield was 400–500 mg/L at 0.1–1% salinity while the TOC, NO3−-N, PO43−-P were eliminated 39.5–92.1%, 23–97.4% and 7–30.6%, ...
DOI:
10.1016/j.biortech.2018.12.026

11. Spatial and temporal distribution characteristics of different forms of inorganic nitrogen in three types of rivers around Lake Taihu, China

Author:
Gao, Yongxia; Yu, Jianghua; Song, Yuzhi; Zhu, Guangwei; Paerl, Hans W.; Qin, Boqiang
Source:
Environmental science and pollution research international 2019 v.26 no.7 pp. 6898-6910
ISSN:
0944-1344
Subject:
nitrate nitrogen,   etc   ; ammonium; ammonium nitrogen; industry; lakes; nitrates; nitrogen; pollution; rivers; sewage; total nitrogen; China;     Show all 12 Subjects
Abstract:
... In order to control nitrogen (N) pollution of Lake Taihu, China, we studied the spatial and temporal distribution characteristics of inorganic N in inflowing rivers polluted by industry, agriculture, and domestic sewage during low, moderate, and high flow periods. The results showed that dissolved total nitrogen (DTN) was the main fraction of total nitrogen (TN) input from these rivers. Inflowing ...
DOI:
10.1007/s11356-019-04154-w

12. Field Evaluation of Potato N Needs Following Forage Legumes

Author:
Kelling, Keith A.; Andraski, Todd W.; Speth, Phillip E.
Source:
American journal of potato research 2019 v.96 no.1 pp. 62-68
ISSN:
1099-209X
Subject:
nitrate nitrogen,   etc   ; Trifolium pratense; alfalfa; forage; forage legumes; nitrogen; nitrogen fertilizers; petioles; potatoes; Wisconsin;     Show all 10 Subjects
Abstract:
... In an attempt to quantify the nitrogen (N) contribution from forage legumes to succeeding potatoes, trials were conducted on 28 Wisconsin alfalfa or red clover fields. Potato total yield and crop value were determined following in-season fertilizer N applications of 0 to 280 kg ha⁻¹. Only 2 of the 12 alfalfa sites and 6 of the 16 red clover sites responded to applied fertilizer N when total yield ...
DOI:
10.1007/s12230-018-9689-2

13. Duration-controlled grazing of dairy cows. 2: nitrogen losses in sub-surface drainage water and surface runoff

Author:
Christensen, Christine L.; Hedley, Mike J.; Hanly, James A.; Horne, David J.
Source:
New Zealand journal of agricultural research 2019 v.62 no.1 pp. 48-68
ISSN:
1175-8775
Subject:
nitrate nitrogen,   etc   ; autumn; dairy cows; grazing; grazing management; leaching; nitrogen; runoff; soil; subsurface drainage; urine; winter;     Show all 12 Subjects
Abstract:
... The annual quantities of nitrate-N (-N) and total N (TN) leached from mole and pipe drained dairy pastures on a Pallic soil, were reduced by an average of 52% and 42% (p < .05), respectively, by standing cows off pasture to ruminate and rest after grazing (Duration-controlled grazing, DC), compared to the standard grazing management (SG) of leaving cows at pasture between milkings. For the SG trea ...
DOI:
10.1080/00288233.2017.1418396

14. A dicyclic-type electrode-based biofilm reactor for simultaneous nitrate and Cr(VI) reduction

Author:
Zhai, Siyuan; Zhao, Yingxin; Ji, Min; Qi, Wenfang
Source:
Bioprocess and biosystems engineering 2019 v.42 no.1 pp. 167-172
ISSN:
1615-7591
Subject:
nitrate nitrogen,   etc   ; biofilm; carbon nitrogen ratio; chromium; coprecipitation; denitrification; hydrogen; methanol; nitrates;     Show all 9 Subjects
Abstract:
... A dicyclic-type electrode-based biofilm-electrode reactor (BER) was investigated for simultaneous removal of nitrate and Cr(VI). In the absence of Cr(VI), almost complete denitrification of 50 mg/L NO₃⁻–N was achieved at a very low C/N ratio of 0.8 with the optimal current of 50 mA. Cr(VI) was removed by biological reduction and co-precipitation when Cr(VI) was taken as the only electron acceptor, ...
DOI:
10.1007/s00449-018-2020-2

15. Migration and transformation of nitrogen in bioretention system during rainfall runoff

Author:
Fan, Gongduan; Li, Zhongsheng; Wang, Shumin; Huang, Keshu; Luo, Jing
Source:
Chemosphere 2019 v.232 pp. 54-62
ISSN:
0045-6535
Subject:
nitrate nitrogen,   etc   ; absorption; ammonium nitrogen; bioretention areas; denitrification; models; nitrification; nitrogen balance; organic nitrogen; pollution; rain; runoff; soil; stable isotopes;     Show all 14 Subjects
Abstract:
... Bioretention systems have been extensively studied as a highly efficient technical measure to tackle the global threat of nitrogen pollution during global rainfall runoff. However, the migration and transformation of various forms nitrogen in bioretention system is unclear. So, in this paper, the bioretention systems with different flow regimes and planted configurations were designed to study the ...
DOI:
10.1016/j.chemosphere.2019.05.177

16. Evaluation of deammonification reactor performance and microrganisms community during treatment of digestate from swine sludge CSTR biodigester

Author:
Chini, Angélica; Bolsan, Alice Chiapetti; Hollas, Camila Ester; Antes, Fabiane Goldschmidt; Fongaro, Gislaine; Treichel, Helen; Kunz, Airton
Source:
Journal of environmental management 2019 v.246 pp. 19-26
ISSN:
0301-4797
Subject:
nitrate nitrogen,   etc   ; anaerobic ammonium oxidation; carbon nitrogen ratio; microorganisms; nitrogen; pig manure; pollution load; sludge; swine; total organic carbon;     Show all 10 Subjects
Abstract:
... Digestate from anaerobic processes still contains relatively high amount of total organic carbon (TOC) that can inhibit deammonification. In this sense, the present study investigated the interference of TOC in a lab-scale expanded granular sludge bed (EGSB) deammonification reactor treating digestate from a continuous stirred tank reactor (CSTR) swine sludge biodigester. Additionally, the microor ...
DOI:
10.1016/j.jenvman.2019.05.113

17. Simultaneous removal of nitrogen and pharmaceutical and personal care products from the effluent of waste water treatment plants using aerated solid-phase denitrification system

Author:
Sun, Haimeng; Wang, Ting; Yang, Zhongchen; Yu, Cecilia; Wu, Weizhong
Source:
Bioresource technology 2019 v.287 pp. 121389
ISSN:
0960-8524
Subject:
nitrate nitrogen,   etc   ; ammonia; ammonium nitrogen; biodegradation; denitrification; denitrifying bacteria; ibuprofen; nitrification; nitrogen; personal care products; pollution; triclosan; wastewater treatment;     Show all 13 Subjects
Abstract:
... Nowadays, waste water treatment plants (WWTPs) are regarded as the pollution sources of nitrogen and pharmaceutical and personal care products (PPCPs). In the present study, the simultaneous removal of nitrogen and typical PPCPs, ibuprofen and triclosan, was evaluated in a poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) based solid-phase denitrification (SPD) system. Results after 602 days show ...
DOI:
10.1016/j.biortech.2019.121389

18. Rural domestic wastewater treatment in constructed ditch wetlands: Effects of influent flow ratio distribution

Author:
Ma, Yuhui; Zhai, Yukun; Zheng, Xiangyong; He, Shengbing; Zhao, Min
Source:
Journal of cleaner production 2019 v.225 pp. 350-358
ISSN:
0959-6526
Subject:
nitrate nitrogen,   etc   ; chemical oxygen demand; constructed wetlands; models; nitrogen; pollution control; sewage treatment; sustainable technology; total nitrogen; wastewater; winter;     Show all 11 Subjects
Abstract:
... Constructed wetlands (CWs) are a sustainable technology used to remove pollutants from wastewater; however, their low total nitrogen (TN) removal efficiency remains a pressing issue. Constructed ditch wetland systems (CDWs) differ from CWs in being narrow and shallow. This study observed the performance of CDWs throughout their operational period and investigated the causes of their low TN removal ...
DOI:
10.1016/j.jclepro.2019.03.235

19. An efficient way to enhance the total nitrogen removal efficiency of the Anammox process by S0-based short-cut autotrophic denitrification

Author:
Chen, Fangmin; Li, Xiang; Yuan, Yan; Huang, Yong
Source:
Journal of environmental sciences (China) 2019 v.81 pp. 214-224
ISSN:
1001-0742
Subject:
nitrate nitrogen,   etc   ; Thiobacillus; ammonium nitrogen; anaerobic ammonium oxidation; denitrification; microbial communities; nitrates; nitrifying bacteria; nitrogen dioxide; sulfur; total nitrogen; wastewater;     Show all 12 Subjects
Abstract:
... In order to reduce the amount of NO3−–N generated by the Anammox process, and alleviate the competition between denitrification and Anammox for NO2−–N in a single reactor, the preference of S0 for reacting with coexisting NO2−–N and NO3−–N in the sulfur autotrophic denitrifying (SADN) process and the coupling effect of short-cut SADN and the Anammox process were studied. The results showed that S0 ...
DOI:
10.1016/j.jes.2019.01.010

20. Enhanced nitrogen removal of the simultaneous partial nitrification, anammox and denitrification (SNAD) biofilm reactor for treating mainstream wastewater under low dissolved oxygen (DO) concentration

Author:
Zheng, Zhaoming; Huang, Shan; Bian, Wei; Liang, Dongbo; Wang, Xiujie; Zhang, Kai; Ma, Xiaoran; Li, Jun
Source:
Bioresource technology 2019 v.283 pp. 213-220
ISSN:
0960-8524
Subject:
nitrate nitrogen,   etc   ; aeration; anaerobic ammonium oxidation; biofilm; denitrification; dissolved oxygen; high-throughput nucleotide sequencing; nitrifying bacteria; nitrites; nitrogen; oxygen; wastewater;     Show all 12 Subjects
Abstract:
... The simultaneous partial nitrification, anammox and denitrification (SNAD) process for treating mainstream wastewater was investigated under different intermittent aeration modes. By controlling the aeration time of 20, 60 and 180 min during the intermittent modes, the oxygen concentration remained 3.50, 1.45 and 0.70 mg·L−1. Correspondingly, the reactor achieved the nitrogen removal rate of 0.17, ...
DOI:
10.1016/j.biortech.2019.01.148