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1. 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,   etc   ; batch systems; denitrification; nitrogen; 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

2. Advanced nitrogen removal of low C/N ratio sewage in an anaerobic/aerobic/anoxic process through enhanced post-endogenous denitrification

Author:
Gao, Xinjie; Zhang, Ting; Wang, Bo; Xu, Zaizhou; Zhang, Liang; Peng, Yongzhen
Source:
Chemosphere 2020 v.252 pp. 126624
ISSN:
0045-6535
Subject:
carbon nitrogen ratio,   etc   ; carbon sequestration; denitrification; nitrogen; sewage; sludge; wastewater treatment;     Show all 7 Subjects
Abstract:
... Currently, it is a major challenge for waste water treatment plants (WWTPs) to achieve enhanced nitrogen removal economically and effectively from carbon-limited sewage to meet gradually stringent discharge quality standards. Enhanced nitrogen removal can be achieved by endogenous denitrification (ED) treatment of low C/N municipal sewage, but its application is limited by the slow reaction rate. ...
DOI:
10.1016/j.chemosphere.2020.126624

3. Butyric acid as sole product from xylose fermentation by a non-solventogenic Clostridium beijerinckii strain under controlled pH and nutritional conditions

Author:
Fonseca, Bruna Constante; Bortolucci, Jonatã; da Silva, Thalita Marques; dos Passos, Vinícius Fabiano; de Gouvêa, Paula Fagundes; Dinamarco, Taísa Magnani; Reginatto, Valeria
Source:
Bioresource technology reports 2020 v.10 pp. 100426
ISSN:
2589-014X
Subject:
carbon nitrogen ratio,   etc   ; Clostridium beijerinckii; acetate kinase; acetates; butyric acid; fermentation; genes; lignocellulose; pH; xylose;     Show all 10 Subjects
Abstract:
... Fermentative processes allow butyric acid to be produced from renewable substrates, which makes this compound commercially attractive. We have employed the non-solventogenic C. beijerinckii strain Br21 to obtain butyric acid from xylose under different nutritional conditions and controlled pH. Reinforced Clostridium Medium (RCM), which has the lowest C/N ratio, provided the highest butyrate/acetat ...
DOI:
10.1016/j.biteb.2020.100426

4. Correction to: Optimization of denitrifying phosphorus removal in a predenitrification anaerobic/anoxic/post-aeration + nitrification sequence batch reactor (pre-A2NSBR) system: Nitrate recycling, carbon/nitrogen ratio and carbon source type

Author:
Zhao, Weihua; Wang, Meixiang; Li, Jianwei; Huang, Yu; Li, Baikun; Pan, Cong; Li, Xiyao; Peng, Yongzhen
Source:
Frontiers of environmental science & engineering 2020 v.14 no.3 pp. 54
ISSN:
2095-2201
Subject:
carbon nitrogen ratio,   etc   ; batch systems; carbon; denitrification; environmental engineering; nitrates; nitrification; nitrogen; phosphorus; recycling; Connecticut;     Show all 11 Subjects
Abstract:
... The authors regret that the original version of the above article contained an error of the affiliation of one of the co-authors Baikun Li. The correct and final version is shown below: Baikun Li, Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269, USA. The authors would like to apologise for any inconvenience caused. ...
DOI:
10.1007/s11783-020-1233-1

5. Production and characterization of organic manure from liquorice residues

Author:
Mouhamad, Raghad S.; Mohammed, Zainab J.; Abdulhadi, Ahmad A.; Abbas, Mazhar; Iqbal, Munawar; Nazir, Arif
Source:
Information processing in agriculture 2020 v.7 no.2 pp. 233-241
ISSN:
2214-3173
Subject:
carbon nitrogen ratio,   etc   ; agricultural wastes; composts; electrical conductivity; fermentation; licorice; mineral content; nitrogen; pH;     Show all 9 Subjects
Abstract:
... In present investigation, organic manure was produced and characterized from liquorice residues using activated Effective Microoganism (AEM). The liquorice waste residues were fermented for the period of 6 months in the presence of activated AEM at the rate of 2.5% and 5% of total fermented mixture. Nitrogen (62.5 g) was used per 10 kg of liquorice and moister was maintained at 55–60% during ferme ...
DOI:
10.1016/j.inpa.2019.09.004

6. Application of artificial neural network and multiple linear regression in modeling nutrient recovery in vermicompost under different conditions

Author:
Hosseinzadeh, Ahmad; Baziar, Mansour; Alidadi, Hossein; Zhou, John L.; Altaee, Ali; Najafpoor, Ali Asghar; Jafarpour, Salman
Source:
Bioresource technology 2020 v.303 pp. 122926
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; neural networks; prediction; regression analysis; solid wastes; total nitrogen; total phosphorus; vermicomposting; vermicomposts;     Show all 9 Subjects
Abstract:
... Vermicomposting is one of the best technologies for nutrient recovery from solid waste. This study aims to assess the efficiency of Artificial Neural Network (ANN) and Multiple Linear Regression (MLR) models in predicting nutrient recovery from solid waste under different vermicompost treatments. Seven chemical and biological indices were studied as input variables to predict total nitrogen (TN) a ...
DOI:
10.1016/j.biortech.2020.122926

7. Integrated Fixed Film Activated Sludge (IFAS) membrane BioReactor: The influence of the operational parameters

Author:
Mannina, Giorgio; Capodici, Marco; Cosenza, Alida; Di Trapani, Daniele; Zhu, Zhengyu; Li, Yongmei
Source:
Bioresource technology 2020 v.301 pp. 122752
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; activated sludge; biofilm; fouling; membrane bioreactors; nitrification; organic carbon;     Show all 7 Subjects
Abstract:
... The present paper investigated an Integrated Fixed Film Activated Sludge (IFAS) Membrane BioReactor (MBR) system monitored for 340 days. In particular, the short-term effects of some operational parameters variation was evaluated. Results showed a decrease of the removal rates under low C/N values. Respirometry results highlighted that activated sludge was more active in the organic carbon removal ...
DOI:
10.1016/j.biortech.2020.122752

8. Nitrate removal from low carbon-to-nitrogen ratio wastewater by combining iron-based chemical reduction and autotrophic denitrification

Author:
Liu, Xiawei; Huang, Manqi; Bao, Shaopan; Tang, Wei; Fang, Tao
Source:
Bioresource technology 2020 v.301 pp. 122731
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; Hydrogenophaga; chemical reduction; denitrification; nitrate nitrogen; nitrates; wastewater;     Show all 7 Subjects
Abstract:
... Nitrate removal from low carbon-to-nitrogen ratio (C/N) wastewater has always been a knotty problem due to the deficiency of organics. Here, a novel iron-based chemical reduction and autotrophic denitrification (ICAD) system was developed. ICAD system could maintain average nitrate removal efficiency of 97.2% for 131 days with feeding 20.3 mg NO₃–-N/L at hydraulic retention time (HRT) of 24 h. The ...
DOI:
10.1016/j.biortech.2019.122731

9. Denitrification with non-organic electron donor for treating low C/N ratio wastewaters

Author:
Tian, Tian; Yu, Han-Qing
Source:
Bioresource technology 2020 v.299 pp. 122686
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; denitrification; hydrogen; ions; iron; microorganisms; sulfur; sulfur compounds; wastewater; wastewater treatment;     Show all 10 Subjects
Abstract:
... Denitrification with non-organic electron donors for treating low C/N ratio wastewater has attracted growing interests. Hydrogen, reduced sulfur compounds and ferrous ions are mainly used in autotrophic denitrification, holding promise for achieving practical applications. Recently, the development of autotrophic denitrification-based processes, such as bioelectrochemically-supported hydrogenotrop ...
DOI:
10.1016/j.biortech.2019.122686

10. RETRACTED: Increased abundance of nitrogen fixing bacteria by higher C/N ratio reduces the total losses of N and C in cattle manure and corn stover mix composting

Author:
Zhang, Wenming; Yu, Chenxu; Wang, Xujie; Hai, Long; Hu, Juan
Source:
Waste management 2020 v.103 pp. 416-425
ISSN:
0956-053X
Subject:
carbon nitrogen ratio,   etc   ; cattle manure; composting; composts; corn stover; denitrifying bacteria; nitrogen-fixing bacteria; temperature;     Show all 8 Subjects
Abstract:
... This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Editor-in-Chief.The article duplicates significant parts of a paper that had already appeared in Bioresource Technology, Volume 297, February 2020, 122410, https://doi.org/10.1016/j.biortech.2019.122410. One of the ...
DOI:
10.1016/j.wasman.2020.01.006

11. 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:
carbon nitrogen ratio,   etc   ; ammonium nitrogen; biofilm; carbon; denitrification; nitrate nitrogen; 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

12. 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,   etc   ; Nitrosomonas; Zoogloea; ammonia; ammonia monooxygenase; bacteria; biochemical pathways; biomarkers; ecological communities; nitrification; nitrogen; sludge; total nitrogen;     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

13. Potential of hyperspectral data and machine learning algorithms to estimate the forage carbon-nitrogen ratio in an alpine grassland ecosystem of the Tibetan Plateau

Author:
Gao, Jinlong; Liang, Tiangang; Liu, Jie; Yin, Jianpeng; Ge, Jing; Hou, Mengjing; Feng, Qisheng; Wu, Caixia; Xie, Hongjie
Source:
ISPRS journal of photogrammetry and remote sensing 2020 v.163 pp. 362-374
ISSN:
0924-2716
Subject:
carbon nitrogen ratio,   etc   ; alpine grasslands; chlorophyll; developmental stages; ecosystems; forage; models; nutrient utilization; support vector machines; China;     Show all 10 Subjects
Abstract:
... The carbon-nitrogen (C:N) ratio plays a crucial role in regulation of the nutrient utilization efficiency and growth rate of plants. However, challenges are faced when hyperspectral data are directly used to estimate the C:N ratio due to the lack of corresponding sensitive feature bands. This study aims to explore the feasibility of using important bands (IBs) determined for the C:N ratio and know ...
DOI:
10.1016/j.isprsjprs.2020.03.017

14. Effect of inoculating microorganisms in chicken manure composting with maize straw

Author:
Wan, Leibing; Wang, Xitao; Cong, Cong; Li, Jingbo; Xu, Yongping; Li, Xiaoyu; Hou, Fuqin; Wu, Yanyan; Wang, Lili
Source:
Bioresource technology 2020 v.301 pp. 122730
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; ammonium; composted manure; composting; cooling; corn straw; germination; humification; microorganisms; nitrates; nitrogen; pH; poultry manure; temperature;     Show all 14 Subjects
Abstract:
... The effects of inoculating with microorganisms on chicken manure compost with maize straw were investigated in a self-built aerated static box (0.6 m³) by assessing the influences of temperature, moisture, pH, C/N ratio, transformation of nitrogen, humification levels and composting maturity. Results showed that inoculation with microorganisms prolonged the thermophilic stage in composting compare ...
DOI:
10.1016/j.biortech.2019.122730

15. Impact of static biocarriers on the microbial community, nitrogen removal and membrane fouling in submerged membrane bioreactor at different COD:N ratios

Author:
Wang, K.M.; Jiang, S.F.; Zhang, Z.H.; Ye, Q.Q.; Zhang, Y.C.; Zhou, J.H.; Hong, Q.K.; Yu, J.M.; Wang, H.Y.
Source:
Bioresource technology 2020 v.301 pp. 122798
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; Amaricoccus; Nitrosospira; bacteria; denitrification; fouling; membrane bioreactors; microbial communities; nitrification; nitrogen; particle size; sludge; total nitrogen;     Show all 13 Subjects
Abstract:
... The polyvinyl formal (PVFM) biocarrier addition in a membrane bioreactor (MBR) was evaluated at high and low carbon/nitrogen (C/N) ratio of 20.0 and 6.7. Results indicated that static biocarrier addition could enrich nitrification and denitrification bacteria, dominating by Tauera, Amaricoccus and Nitrosospira at the genus level and slightly improved the total nitrogen removal even at a low C/N ra ...
DOI:
10.1016/j.biortech.2020.122798

16. Intensified nitrogen removal by heterotrophic nitrification aerobic denitrification bacteria in two pilot-scale tidal flow constructed wetlands: Influence of influent C/N ratios and tidal strategies

Author:
Tan, Xu; Yang, Yan-Ling; Li, Xing; Zhou, Zhi-Wei; Liu, Chang-Jian; Liu, Yong-Wang; Yin, Wen-Chao; Fan, Xiao-Yan
Source:
Bioresource technology 2020 v.302 pp. 122803
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; Aeromonas; Gemmobacter; ammonium nitrogen; bacteria; bacterial communities; community structure; constructed wetlands; denitrification; nitrification; nitrogen; temperature;     Show all 12 Subjects
Abstract:
... This study investigated the influence of C/N ratios and tidal strategies on nitrogen removal and bacterial communities in two pilot-scale tidal flow constructed wetlands (TFCWs) with simultaneous nitrification–denitrification process. Heterotrophic nitrification aerobic denitrification (HNAD) was the main nitrogen transformation pathway in both TFCWs. High C/N ratios and effluent circulation at lo ...
DOI:
10.1016/j.biortech.2020.122803

17. Changing riverine organic C:N ratios along the Pearl River: Implications for estuarine and coastal carbon cycles

Author:
Liu, Qinyu; Liang, Yingtong; Cai, Wei-Jun; Wang, Kuo; Wang, Juying; Yin, Kedong
Source:
The Science of the total environment 2020 v.709 pp. 136052
ISSN:
0048-9697
Subject:
carbon nitrogen ratio,   etc   ; carbon sinks; cities; coastal water; dissolved inorganic nitrogen; estuaries; nitrogen; phytoplankton; rivers; total organic carbon;     Show all 10 Subjects
Abstract:
... In the traditional view, riverine organic matter typically has a higher C:N ratio than marine phytoplankton 6.7:1 and has therefore been thought to be a carbon source in estuaries and coastal waters. Thus, a decrease in the riverine organic C:N ratio to <6.7:1 would potentially switch riverine organic matter from a coastal carbon source to sink. However, few studies have paid an attention to such ...
DOI:
10.1016/j.scitotenv.2019.136052

18. Enzymatic activities triggered by the succession of microbiota steered fiber degradation and humification during co-composting of chicken manure and rice husk

Author:
Liu, Hongjun; Huang, Yan; Wang, Huan; Shen, Zongzhuan; Qiao, Cece; Li, Rong; Shen, Qirong
Source:
Journal of environmental management 2020 v.258 pp. 110014
ISSN:
0301-4797
Subject:
carbon nitrogen ratio,   etc   ; Bacilli; cellulose; composting; enzyme activity; fertilizers; germination; glycosidases; humification; microbial communities; microorganisms; poultry manure; rice hulls;     Show all 13 Subjects
Abstract:
... The carbon to nitrogen ratio (C/N) is well known for its importance in the composting process, however the fiber degradation and humification associated with enzymatic activity and microbial variation derived from different C/N ratios are poorly studied. Here, we designed two treatments of chicken manure with 15% (initial C/N ratio 9.61) and 50% (initial C/N ratio 17.3) rice husk to adjust the moi ...
DOI:
10.1016/j.jenvman.2019.110014

19. Inoculation of cattle manure with microbial agents increases efficiency and promotes maturity in composting

Author:
Li, Jingbo; Wang, Xitao; Cong, Cong; Wan, Leibing; Xu, Yongping; Li, Xiaoyu; Hou, Fuqin; Wu, Yanyan; Wang, Lili
Source:
3 Biotech 2020 v.10 no.3 pp. 128
ISSN:
2190-572X
Subject:
carbon nitrogen ratio,   etc   ; cattle manure; composting; culture media; germination; inoculation methods; microorganisms; nutrients; organic matter; pH; rice straw; sterilizing; temperature;     Show all 13 Subjects
Abstract:
... In this study, fresh cattle manure was mixed with rice straw at a ratio of 10:1 in fresh weight and then composted in a self-built, aerated static composting box, whose dimension was 1 m × 0.8 m × 0.8 m with a volume of approximately 0.6 m³. To deal with the inconvenient and time-consuming problem of multiple stage inoculation, a single, one-time inoculation agent containing diverse microorganisms ...
DOI:
10.1007/s13205-020-2127-4
PubMed:
32154041
PubMed Central:
PMC7035406

20. Recent advances in controlling denitritation for achieving denitratation/anammox in mainstream wastewater treatment plants

Author:
Ma, Bin; Xu, Xinxin; Wei, Yan; Ge, Chengjun; Peng, Yongzhen
Source:
Bioresource technology 2020 v.299 pp. 122697
ISSN:
0960-8524
Subject:
carbon nitrogen ratio,   etc   ; anaerobic ammonium oxidation; denitrification; long term effects; nitrites; nitrogen; organic matter; oxygen; pH; wastewater treatment;     Show all 10 Subjects
Abstract:
... Denitratation (NO₃⁻→NO₂⁻)/anammox is a promising method for anammox application in mainstream wastewater treatment plants (WWTPs) to reduce oxygen and organic matter consumption. Achieving nitrite production via denitratation and controlling denitritation (NO₂⁻→N₂) is the basis of the denitratation/anammox process. To control denitritation, the denitrifying biocommunity and growth rate are critica ...
DOI:
10.1016/j.biortech.2019.122697