The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Tao Fang - One of the best experts on this subject based on the ideXlab platform.
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the contributions and mechanisms of iron microbes biochar in constructed wetlands for nitrate removal from low carbon Nitrogen Ratio wastewater
RSC Advances, 2020Co-Authors: Xiawei Liu, Manqi Huang, Shaopan Bao, Wei Tang, Jiaolong Huang, Tao Wang, Tao FangAbstract:The removal efficiency of nitrate from low carbon/Nitrogen Ratio wastewater has been restricted by the lack of organics for several decades. Here, a system coupling chemical reduction, microbial denitrification and constructed wetlands (RDCWs) was developed to investigate the effect and possible mechanisms for nitrate degradation. The results showed that this coupling system could achieve a nitrate removal efficiency of 97.07 ± 1.76%, 85.91 ± 3.02% and 56.63 ± 2.88% at a hydraulic retention time of 24 h, 12 h and 6 h with feeding nitrate of 15 mg L−1, respectively. These removal efficiencies of nitrate were partly caused by microbes and biochar with a contribution rate of 31.08 ± 4.43% and 9.50 ± 3.30%. Besides, microbes were closely related to iron and biochar for the removal of nitrate. Simplicispira was able to utilize hydrogen produced by iron corrosion as an electron donor while nitrate accepted electrons to be reduced. Porous biochar could release dissolved organic matter, which provided a good living circumstance and carbon source for microbes. Therefore, the RDCW system is potential for large-scale application due to its low cost and simple opeRation.
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Nitrate removal from low carbon-to-Nitrogen Ratio wastewater by combining iron-based chemical reduction and autotrophic denitrification
Bioresource technology, 2020Co-Authors: Xiawei Liu, Manqi Huang, Shaopan Bao, Wei Tang, Tao FangAbstract: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 optimal opeRational conditions was further explored, and results demonstrated that average nitrate removal efficiency of 85.5% and 98.4% could be achieved at HRT of 12 h and 24 h (influent 20.3 mg NO3–-N/L), while average nitrate removal efficiency could reach 96.3% at optimal HRT of 12 h (influent 10.3 mg NO3–-N/L). Hydrogenophaga, which can carry out hydrogenotrophic denitrification, showed a positive correlation with nitrate removal efficiency of the ICAD system. Low cost and simple opeRation make the ICAD system suitable for large-scale application.
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Bacteria-supported iron scraps for the removal of nitrate from low carbon-to-Nitrogen Ratio wastewater
RSC Advances, 2019Co-Authors: Xiawei Liu, Manqi Huang, Shaopan Bao, Wei Tang, Jiaolong Huang, Tao Wang, Tao FangAbstract:A novel bacteria-supported iron scraps (BSIS) system was developed for nitrate removal from low carbon-to-Nitrogen Ratio (C/N) wastewater. The system consisted of low-cost iron scraps and the accumulated denitrifying-related bacteria enriched from an Fe-wastewater environment when the system was operating. After operating for 39 d, the nitrate removal rate of the system increased to 73.55% within 24 h. The extraction of bacteria from the system revealed that iron scraps and bacteria had a synergistic effect on nitrate removal and bacteria only took effect when cooperating with iron. Microbial analysis using high-throughput sequencing showed that Hydrogenophaga, which is closely related to hydrogenotrophic denitrification, became the dominant genus in the system. The system provides a promising approach to the treatment of nitrate in low C/N wastewater and it has the potential for large-scale application due to the low cost, simple opeRation and relatively high removal rate.
Juan R Munozcastaneda - One of the best experts on this subject based on the ideXlab platform.
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assessment of inorganic phosphate intake by the measurement of the phosphate urea Nitrogen Ratio in urine
Nutrients, 2021Co-Authors: Maria Victoria Pendonruiz De Mier, Noemi Vergara, Cristian Rodelohaad, Maria Dolores Lopezzamorano, Cristina Membrivesgonzalez, Rodrigo Lopezbaltanas, Juan R MunozcastanedaAbstract:In chronic kidney disease (CKD) patients, it would be desirable to reduce the intake of inorganic phosphate (P) rather than limit the intake of P contained in proteins. Urinary excretion of P should reflect intestinal absorption of P(inorganic plus protein-derived). The aim of the present study is to determine whether the Ratio of urinary P to urinary urea Nitrogen (P/UUN Ratio) helps identify patients with a high intake of inorganic P.A cross-sectional study was performed in 71 patients affected by metabolic syndrome with CKD (stages 2-3) with normal serum P concentRation. A 3-day dietary survey was performed to estimate the average daily amount and the source of P ingested. The daily intake ofPwas1086.5 ± 361.3mg/day; 64% contained in animal proteins, 22% in vegetable proteins, and 14% as inorganic P. The total amount of P ingested did not correlate with daily phosphaturia, but it did correlate with the P/UUN Ratio (p 71.1 mg/g presented more abundant inorganic P intake (p < 0.038).The P/UUN Ratio is suggested to be a marker of inorganic P intake. This finding might be useful in clinical practices to identify the source of dietary P and to make personalized dietary recommendations directed to reduce inorganic P intake.
Jian Chen - One of the best experts on this subject based on the ideXlab platform.
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Effects of organic matter and initial carbon–Nitrogen Ratio on the bioconversion of volatile fatty acids from sewage sludge
Journal of Chemical Technology & Biotechnology, 2008Co-Authors: Xiaoling Liu, He Liu, Yiyang Chen, Jian ChenAbstract:BACKGROUND: The biodegradable organic matter and the initial carbon–Nitrogen Ratio can be substantially different in different batches of sewage sludge, which results in a difference in the acidification efficiency of sludge. Using sewage sludge from three different sources, batch tests were performed to analyze the relationship between volatile fatty acids (VFAs) and consumed organic matter, and to investigate the effects of initial carbon–Nitrogen (C/N) Ratio on the acidification efficiency of sludge. RESULTS: Maximum yields of 152.1 ± 3.5 mg total VFAs-COD per gram volatile solid (VS) added and 22.4 ± 1. 2m g butyric acid-COD g −1 VS added were obtained from the sludge with the highest initial C/N Ratio. Statistical analysis indicated that protein was the major substrate for the produced VFAs. The sludge with the least initial C/N Ratio (5.01) had the least yield, and only acetic acid, which was also mainly related to protein, was detected. CONCLUSION: The initial carbon–Nitrogen Ratio was one of the most important factors influencing the distribution patterns of VFAs and the yield of total VFAs produced from sewage sludge. A high C/N Ratio could not only improve the yield of total VFAs but also enhance the yield of butyric acid. 2008 Society of Chemical Industry
Xiawei Liu - One of the best experts on this subject based on the ideXlab platform.
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the contributions and mechanisms of iron microbes biochar in constructed wetlands for nitrate removal from low carbon Nitrogen Ratio wastewater
RSC Advances, 2020Co-Authors: Xiawei Liu, Manqi Huang, Shaopan Bao, Wei Tang, Jiaolong Huang, Tao Wang, Tao FangAbstract:The removal efficiency of nitrate from low carbon/Nitrogen Ratio wastewater has been restricted by the lack of organics for several decades. Here, a system coupling chemical reduction, microbial denitrification and constructed wetlands (RDCWs) was developed to investigate the effect and possible mechanisms for nitrate degradation. The results showed that this coupling system could achieve a nitrate removal efficiency of 97.07 ± 1.76%, 85.91 ± 3.02% and 56.63 ± 2.88% at a hydraulic retention time of 24 h, 12 h and 6 h with feeding nitrate of 15 mg L−1, respectively. These removal efficiencies of nitrate were partly caused by microbes and biochar with a contribution rate of 31.08 ± 4.43% and 9.50 ± 3.30%. Besides, microbes were closely related to iron and biochar for the removal of nitrate. Simplicispira was able to utilize hydrogen produced by iron corrosion as an electron donor while nitrate accepted electrons to be reduced. Porous biochar could release dissolved organic matter, which provided a good living circumstance and carbon source for microbes. Therefore, the RDCW system is potential for large-scale application due to its low cost and simple opeRation.
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Nitrate removal from low carbon-to-Nitrogen Ratio wastewater by combining iron-based chemical reduction and autotrophic denitrification
Bioresource technology, 2020Co-Authors: Xiawei Liu, Manqi Huang, Shaopan Bao, Wei Tang, Tao FangAbstract: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 optimal opeRational conditions was further explored, and results demonstrated that average nitrate removal efficiency of 85.5% and 98.4% could be achieved at HRT of 12 h and 24 h (influent 20.3 mg NO3–-N/L), while average nitrate removal efficiency could reach 96.3% at optimal HRT of 12 h (influent 10.3 mg NO3–-N/L). Hydrogenophaga, which can carry out hydrogenotrophic denitrification, showed a positive correlation with nitrate removal efficiency of the ICAD system. Low cost and simple opeRation make the ICAD system suitable for large-scale application.
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Bacteria-supported iron scraps for the removal of nitrate from low carbon-to-Nitrogen Ratio wastewater
RSC Advances, 2019Co-Authors: Xiawei Liu, Manqi Huang, Shaopan Bao, Wei Tang, Jiaolong Huang, Tao Wang, Tao FangAbstract:A novel bacteria-supported iron scraps (BSIS) system was developed for nitrate removal from low carbon-to-Nitrogen Ratio (C/N) wastewater. The system consisted of low-cost iron scraps and the accumulated denitrifying-related bacteria enriched from an Fe-wastewater environment when the system was operating. After operating for 39 d, the nitrate removal rate of the system increased to 73.55% within 24 h. The extraction of bacteria from the system revealed that iron scraps and bacteria had a synergistic effect on nitrate removal and bacteria only took effect when cooperating with iron. Microbial analysis using high-throughput sequencing showed that Hydrogenophaga, which is closely related to hydrogenotrophic denitrification, became the dominant genus in the system. The system provides a promising approach to the treatment of nitrate in low C/N wastewater and it has the potential for large-scale application due to the low cost, simple opeRation and relatively high removal rate.
Zhiyu Shao - One of the best experts on this subject based on the ideXlab platform.
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Enhanced simultaneous nitrification and denitrification in treating low carbon-to-Nitrogen Ratio wastewater: Treatment performance and Nitrogen removal pathway.
Bioresource technology, 2019Co-Authors: Hongxiang Chai, Yu Xiang, Rong Chen, Zhiyu ShaoAbstract:Abstract Simultaneous nitrification and denitrification (SND) is an energy-saving wastewater treatment process, however, the Nitrogen removal pathways are not clear. An enhanced SND sequencing batch biofilm reactor with a SND Ratio above 97.3% was built to treat low carbon to Nitrogen Ratio wastewater. When traditional nitrification was inhibited, ammonia removal efficiency still reached 45% in 8 h while the NO3− and NO2− concentRation was less than 3 mg/L and 0.01 mg/L during the complete process, respectively. The pathways that could not be suppressed by the inhibitors (ATU and ClO3−) were stimulated by heterotrophic nitrifiers and aerobic denitrifiers with periplasmic nitrate reductase and contributed 55% of the total removed NH4+ and produced 51% of the emitted N2O. The contributions of different Nitrogen removal pathways indicate that the unconventional pathways are important in wastewater treatment system and inhibitors should be carefully used in Nitrogen removal pathway assays.
