Pub Date : 2017-01-01DOI: 10.12783/ISSN.1544-8053/14/1/19
Huiping Song, Y. Wei, F. Cheng
Hydrothermal hot-pressing will occur between silica in fly ash and calcium in carbide slag and give rise to high-strength hydrates. High-strength solidified specimens were prepared with fly ash and carbide slag via hydrothermal hot-pressing at 200°C and 7 MPa. The effect of concentration of activator and content of carbide slag on compressive strength of the specimens was analyzed. It was found that when the mass ratio of fly ash to carbide slag was 1:1 and 20% 5 mol/L NaOH solution was added, the solidified specimens contained a large amount of cross-linked fibrous tobermorite with compressive strength of 70.93 MPa. The solidified specimens had a good fixation effect on such heavy metals as Cu, Zn, Cd and Pb. Hydrothermal hot-pressing, featured by simple procedures, easy automation and low cost, is an ideal potential way of utilizing fly ash and carbide slag and fixation of heavy metals.
{"title":"High-Strength Solidification of Fly Ash/Carbide Slag and Its Fixing Ability for Heavy Metals","authors":"Huiping Song, Y. Wei, F. Cheng","doi":"10.12783/ISSN.1544-8053/14/1/19","DOIUrl":"https://doi.org/10.12783/ISSN.1544-8053/14/1/19","url":null,"abstract":"Hydrothermal hot-pressing will occur between silica in fly ash and calcium in carbide slag and give rise to high-strength hydrates. High-strength solidified specimens were prepared with fly ash and carbide slag via hydrothermal hot-pressing at 200°C and 7 MPa. The effect of concentration of activator and content of carbide slag on compressive strength of the specimens was analyzed. It was found that when the mass ratio of fly ash to carbide slag was 1:1 and 20% 5 mol/L NaOH solution was added, the solidified specimens contained a large amount of cross-linked fibrous tobermorite with compressive strength of 70.93 MPa. The solidified specimens had a good fixation effect on such heavy metals as Cu, Zn, Cd and Pb. Hydrothermal hot-pressing, featured by simple procedures, easy automation and low cost, is an ideal potential way of utilizing fly ash and carbide slag and fixation of heavy metals.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"9 1","pages":"155-160"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85717254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/issn.1544-8053/14/1/42
Wang Huigai, Zhang Keke, Z. Jianxin
The effect of multiple solution and aging treatment on microstructures and room-mechanical properties of Ti-53 alloy is studied by OM, SEM and universal material testing machine. The results show that the quantity of secondary α lamella, hardness, strength, and plasticity of Ti-53 alloy decrease after the peak value with the cycling times of multiple solution and aging treatment increasing. In the process of double solid solution aging treatment, the numerical values of room-mechanical properties reached the highest level. Multiple solution and aging treatment modulates morphology effectively, which can make martensite lamellas with different Berlese’s vectors merge or decompose. Therefore, the excellent match of strength and plasticity can be obtained.
{"title":"Multiple Solution and Aging Treatment Technology Improves Microstructures and Properties of Ti53 Alloy","authors":"Wang Huigai, Zhang Keke, Z. Jianxin","doi":"10.12783/issn.1544-8053/14/1/42","DOIUrl":"https://doi.org/10.12783/issn.1544-8053/14/1/42","url":null,"abstract":"The effect of multiple solution and aging treatment on microstructures and room-mechanical properties of Ti-53 alloy is studied by OM, SEM and universal material testing machine. The results show that the quantity of secondary α lamella, hardness, strength, and plasticity of Ti-53 alloy decrease after the peak value with the cycling times of multiple solution and aging treatment increasing. In the process of double solid solution aging treatment, the numerical values of room-mechanical properties reached the highest level. Multiple solution and aging treatment modulates morphology effectively, which can make martensite lamellas with different Berlese’s vectors merge or decompose. Therefore, the excellent match of strength and plasticity can be obtained.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"74 1","pages":"357-362"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88516472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/ISSN.1544-8053/14/1/1
G. Singh, S. Kumar, Kaushal Kumar
In present work, an attempt has been made to improve the quality of bottom ash for utilization as a pozzolanic material. All samples were crushed and passed through 250 µm sieve to prepare grounded bottom ash. The physio-chemical, mineral and leaching characteristics of original and grounded bottom ash were studied. Results show that specific gravity and bulk density of all sample increases whereas porosity, water holding capacity and loss of ignition decreases after the grounding the bottom ash. Pozzolanic properties of bottom ash also improved after grounding the ash samples which helps to commercialize its utilization and reduce environmental impact.
{"title":"Comprehensive Characterization of Grounded Bottom Ash from Indian Thermal Power Plant","authors":"G. Singh, S. Kumar, Kaushal Kumar","doi":"10.12783/ISSN.1544-8053/14/1/1","DOIUrl":"https://doi.org/10.12783/ISSN.1544-8053/14/1/1","url":null,"abstract":"In present work, an attempt has been made to improve the quality of bottom ash for utilization as a pozzolanic material. All samples were crushed and passed through 250 µm sieve to prepare grounded bottom ash. The physio-chemical, mineral and leaching characteristics of original and grounded bottom ash were studied. Results show that specific gravity and bulk density of all sample increases whereas porosity, water holding capacity and loss of ignition decreases after the grounding the bottom ash. Pozzolanic properties of bottom ash also improved after grounding the ash samples which helps to commercialize its utilization and reduce environmental impact.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"60 6 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90691343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/ISSN.1544-8053/14/1/41
Yong-guang Bi, Bing Liu, Xueming Liu
Nano titanium dioxide (TiO2) was synthesized by using butyl titanium as raw material with sol-gel method and assisted with ultrasound. The products were characterized by X-Ray diffraction (XRD), Fourier transform infrared spectrophotometry (FTIR). The effects of hydrothermal temperature, ultrasonic time, ultrasonic power and acetic acid dosage were all investigated, and the optimal conditions for the crystal of nano TiO2 were acid dosage 8 mL, temperature at 40°C, extration time 50 min and the ultrasonic power 240 W. A series of drug release experiments were employed in vitro, we found that the maximum drug loading rate reached 67.30%. The results reveal that nano TiO2 is a promising biomedical nanomaterial in the application of drug loading system.
{"title":"The Preparation and the Release Properties of Nanometer Titanium Dioxide","authors":"Yong-guang Bi, Bing Liu, Xueming Liu","doi":"10.12783/ISSN.1544-8053/14/1/41","DOIUrl":"https://doi.org/10.12783/ISSN.1544-8053/14/1/41","url":null,"abstract":"Nano titanium dioxide (TiO2) was synthesized by using butyl titanium as raw material with sol-gel method and assisted with ultrasound. The products were characterized by X-Ray diffraction (XRD), Fourier transform infrared spectrophotometry (FTIR). The effects of hydrothermal temperature, ultrasonic time, ultrasonic power and acetic acid dosage were all investigated, and the optimal conditions for the crystal of nano TiO2 were acid dosage 8 mL, temperature at 40°C, extration time 50 min and the ultrasonic power 240 W. A series of drug release experiments were employed in vitro, we found that the maximum drug loading rate reached 67.30%. The results reveal that nano TiO2 is a promising biomedical nanomaterial in the application of drug loading system.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81470957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/issn.1544-8053/14/1/7
Guang-sheng Chen, Xinhai Li Yukun Xu Lifeng Jiao, Rong Hu
It is an important content to analyze the uncertainty of emission from greenhouse gases in compiling the emission inventory. Reliable uncertainty estimates can also be used to increase the quality of emission inventories. This paper took the emission of CH4 from the solid waste landfill in Hefei City in 2014 as an example, and employed the mass balance method to compute its emission. Monte Carlo method was used to carry out the sensitivity analysis and compute uncertainty. Through computing, 95% confidence interval of CH4 emission from landfill in Hefei City was (1.89~3.40) × 104 t. The mean value was 2.61 × 104 t with uncertainty range of –27.59%~30.27%. Among all the parameters, the decomposable proportion of DOC (DOCf ) showed the greatest impact on the emission of CH4 from the landfill and its contribution to emission result was 26.33%. Followed by the degradable organic carbon (DOC) was 26.29%, the amount of solid waste (MSW) was 13.63%, methane correction factor (MCF) was 6.93% and the proportion of methane in landfill gas (F) was 6.58%. The results showed that compared with traditional error propagation method, it improved the accuracy and quality of assessment and provided a scientific basis to improve the quality of inventory as well.
{"title":"Uncertainty Analysis for Evaluating CH4 Emission from Solid Waste Landfill of Hefei City Based on Monte Carlo Method","authors":"Guang-sheng Chen, Xinhai Li Yukun Xu Lifeng Jiao, Rong Hu","doi":"10.12783/issn.1544-8053/14/1/7","DOIUrl":"https://doi.org/10.12783/issn.1544-8053/14/1/7","url":null,"abstract":"It is an important content to analyze the uncertainty of emission from greenhouse gases in compiling the emission inventory. Reliable uncertainty estimates can also be used to increase the quality of emission inventories. This paper took the emission of CH4 from the solid waste landfill in Hefei City in 2014 as an example, and employed the mass balance method to compute its emission. Monte Carlo method was used to carry out the sensitivity analysis and compute uncertainty. Through computing, 95% confidence interval of CH4 emission from landfill in Hefei City was (1.89~3.40) × 104 t. The mean value was 2.61 × 104 t with uncertainty range of –27.59%~30.27%. Among all the parameters, the decomposable proportion of DOC (DOCf ) showed the greatest impact on the emission of CH4 from the landfill and its contribution to emission result was 26.33%. Followed by the degradable organic carbon (DOC) was 26.29%, the amount of solid waste (MSW) was 13.63%, methane correction factor (MCF) was 6.93% and the proportion of methane in landfill gas (F) was 6.58%. The results showed that compared with traditional error propagation method, it improved the accuracy and quality of assessment and provided a scientific basis to improve the quality of inventory as well.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"15 1","pages":"51-57"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78285951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/ISSN.1544-8053/14/1/18
Xiao-Fei Wang, G. Deng, Juan Yin
Heavy metal contaminations to farmland soil is a common threaten to crop yield and food safety, phytoremediation with economic plants with high bio-accumulation is a sustainable approach to recover polluted farmland. As a high ethanol yield crop, sugarcane has attracted increasing industrial interest as a raw material for biofuel and the risk of heavy metal in it is negligible if the sugar produced is to be fermented into ethanol rather than by consumed. This study is to do a preliminary investigation if sugarcane is a suitable crop for phytoremediation in heavy metal polluted farmland in a context of geographic conditions in southern China, thirty-eight soil and sugarcane samples were collected in five villages in a typical agricultural county called Huangjiang which is located in the Huanjiang River Basin in Guangxi province. Sugarcane is widely cultivated in Huangjiang as one of the major economic crops, meanwhile, pollutions induced by mining and ore-extraction in this area has resulted in heavy metals entering the farmland soils. Samples collected were used to assess the correlation of the level of heavy metals in the soil, and their concentrations in roots, sections of stems and leaves. Seven heavy metals were selected in this study and the results showed that most of the toxic heavy metals intake by sugarcane accumulated in the roots, while only a small portion is transferred to the stems and leaves. The study initially outlined sugarcane as a potential candidate for phytoremediation in farmland polluted by heavy metals with economic motivate in this subtropical geographical background.
{"title":"Heavy Metals in Soil and Sugarcane Accumulation in Agricultural Area along Huanjiang River in Guangxi, China","authors":"Xiao-Fei Wang, G. Deng, Juan Yin","doi":"10.12783/ISSN.1544-8053/14/1/18","DOIUrl":"https://doi.org/10.12783/ISSN.1544-8053/14/1/18","url":null,"abstract":"Heavy metal contaminations to farmland soil is a common threaten to crop yield and food safety, phytoremediation with economic plants with high bio-accumulation is a sustainable approach to recover polluted farmland. As a high ethanol yield crop, sugarcane has attracted increasing industrial interest as a raw material for biofuel and the risk of heavy metal in it is negligible if the sugar produced is to be fermented into ethanol rather than by consumed. This study is to do a preliminary investigation if sugarcane is a suitable crop for phytoremediation in heavy metal polluted farmland in a context of geographic conditions in southern China, thirty-eight soil and sugarcane samples were collected in five villages in a typical agricultural county called Huangjiang which is located in the Huanjiang River Basin in Guangxi province. Sugarcane is widely cultivated in Huangjiang as one of the major economic crops, meanwhile, pollutions induced by mining and ore-extraction in this area has resulted in heavy metals entering the farmland soils. Samples collected were used to assess the correlation of the level of heavy metals in the soil, and their concentrations in roots, sections of stems and leaves. Seven heavy metals were selected in this study and the results showed that most of the toxic heavy metals intake by sugarcane accumulated in the roots, while only a small portion is transferred to the stems and leaves. The study initially outlined sugarcane as a potential candidate for phytoremediation in farmland polluted by heavy metals with economic motivate in this subtropical geographical background.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"50 1","pages":"143-154"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77850799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/issn.1544-8053/14/1/14
Yubo Cui, Hongjie Sun Jinbao Zhao Shiquan Wang, Zhaobo Chen
Wastewater sludge from metropolitan areas has become a source of polycyclic aromatic hydrocarbons (PAHs), and may result in pollution of soils and plants if applied to agricultural areas. It is important to stabilize wastewater sludge before its application to agricultural land. Constructed wetlands (CWs) have been widely applied for stabilization of sludge. In CWs, plants, especially reeds, promote degradation of pollutants in the rhizosphere and are the principal mechanisms for PAH-contaminated sludge phytoremediation. We studied PAH removal in sludge planted with Phragmites australis (common reeds) in onsite experiments over a 3-year period comprising 2 years of sludge application and 1 year of resting. The average PAH content in the feeder sludge was 5.7 mg kg–1 (DW), consisting of approximately 48% low-molecular-weight (2–3 ring) PAHs, 27% middle-molecular-weight (4 ring) PAHs and 25% high-molecular-weight (5–6 ring) PAHs. After 3 years, the average PAH content in stabilized sludge was 2.1 mg kg–1 (DW), which was lower than that of the feeder sludge. Overall, about 66% of low-molecular-weight PAHs (dominant type), 57% of middle-molecular-weight PAHs and 32% of high-molecular-weight PAHs were removed from the stabilized sludge. Additionally, there were spatial variations in PAHs in stabilized sludge, with PAHs being highest in the surface layer (12–14 cm) sludge, lower in the middle layer (6–8 cm) and lowest in the bottom layer (0–2 cm).
{"title":"Phytoremediation of PAHs-contaminated Sludge in a Constructed Wetland","authors":"Yubo Cui, Hongjie Sun Jinbao Zhao Shiquan Wang, Zhaobo Chen","doi":"10.12783/issn.1544-8053/14/1/14","DOIUrl":"https://doi.org/10.12783/issn.1544-8053/14/1/14","url":null,"abstract":"Wastewater sludge from metropolitan areas has become a source of polycyclic aromatic hydrocarbons (PAHs), and may result in pollution of soils and plants if applied to agricultural areas. It is important to stabilize wastewater sludge before its application to agricultural land. Constructed wetlands (CWs) have been widely applied for stabilization of sludge. In CWs, plants, especially reeds, promote degradation of pollutants in the rhizosphere and are the principal mechanisms for PAH-contaminated sludge phytoremediation. We studied PAH removal in sludge planted with Phragmites australis (common reeds) in onsite experiments over a 3-year period comprising 2 years of sludge application and 1 year of resting. The average PAH content in the feeder sludge was 5.7 mg kg–1 (DW), consisting of approximately 48% low-molecular-weight (2–3 ring) PAHs, 27% middle-molecular-weight (4 ring) PAHs and 25% high-molecular-weight (5–6 ring) PAHs. After 3 years, the average PAH content in stabilized sludge was 2.1 mg kg–1 (DW), which was lower than that of the feeder sludge. Overall, about 66% of low-molecular-weight PAHs (dominant type), 57% of middle-molecular-weight PAHs and 32% of high-molecular-weight PAHs were removed from the stabilized sludge. Additionally, there were spatial variations in PAHs in stabilized sludge, with PAHs being highest in the surface layer (12–14 cm) sludge, lower in the middle layer (6–8 cm) and lowest in the bottom layer (0–2 cm).","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"1 1","pages":"107-114"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78805715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/ISSN.1544-8053/14/1/34
Chunyang Li, Guojun Li, R. Ren
The dense and oriented BaTi2O5 (BT2) in a single phase was successfully obtained by an arc melting process on a water-cooled copper plate using BaCO3 and TiO2 as starting materials and B2O3 as an additive. XRD pattern of BT2 showed a preferred orientation of (020). The microstructure of BT2 was examined to show a needle-like shape and the BT2 grains were 3~15 µm in diameters and 22~110 µm in lengths. Though B2O3 was effective to prepare dense BT2, it, disadvantageously, tended to decrease the permittivity of BT2. The discrepancy of the peak frequencies between Z″ and M″ could be ascribed to the existence of structural defects and occurrence of the second phase. The maximum permittivity was 863 when the frequency (f) and the Curie temperature (Tc) were 100 kHz and 465°C, respectively.
{"title":"Preparation of the Oriented Polycrystalline BaTi2O5 Ferroelectric Ceramics","authors":"Chunyang Li, Guojun Li, R. Ren","doi":"10.12783/ISSN.1544-8053/14/1/34","DOIUrl":"https://doi.org/10.12783/ISSN.1544-8053/14/1/34","url":null,"abstract":"The dense and oriented BaTi2O5 (BT2) in a single phase was successfully obtained by an arc melting process on a water-cooled copper plate using BaCO3 and TiO2 as starting materials and B2O3 as an additive. XRD pattern of BT2 showed a preferred orientation of (020). The microstructure of BT2 was examined to show a needle-like shape and the BT2 grains were 3~15 µm in diameters and 22~110 µm in lengths. Though B2O3 was effective to prepare dense BT2, it, disadvantageously, tended to decrease the permittivity of BT2. The discrepancy of the peak frequencies between Z″ and M″ could be ascribed to the existence of structural defects and occurrence of the second phase. The maximum permittivity was 863 when the frequency (f) and the Curie temperature (Tc) were 100 kHz and 465°C, respectively.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"8 1","pages":"299-303"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76327351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/issn.1544-8053/14/1/35
Yuanhong Ding, Jun Zhou Hongqiang Ren Yang Song Qing Wang, Y. Yang
One sample of PU synthetic wastewater was analyzed, its Total Nitrogen (TN) was mainly composed of about 300 mg/L nitrate, and three pieces of anoxic Moving Bed Bio-film Reactors (MBBR) were applied to treat it, one MBBR was run with raw wastewater, the second and third were with synthetic wastewater, and the results were as followings: TN could be removed off completely under the condition of relative low C/N ratio; the C/N ratio of removed pollutants was liner correlation with C/N ratio of influent, but the C/N ratio of effluent was increase violently, the above results demonstrated that, the external carbon source, necessary to the heterotrophic bacteria, was consumed more rapidly than nitrate nitrogen in initial denitrifying stage, then the nitrogen was utilized much more rapidly at later stage, and the ratio of C/N denitrification behaved as a chamfer linear.
{"title":"Effects of C/N Ratio on Nitrate Removal from PU Synthetic Leather Wastewater Treated by Anoxic Moving Bed Bio-film Reactors","authors":"Yuanhong Ding, Jun Zhou Hongqiang Ren Yang Song Qing Wang, Y. Yang","doi":"10.12783/issn.1544-8053/14/1/35","DOIUrl":"https://doi.org/10.12783/issn.1544-8053/14/1/35","url":null,"abstract":"One sample of PU synthetic wastewater was analyzed, its Total Nitrogen (TN) was mainly composed of about 300 mg/L nitrate, and three pieces of anoxic Moving Bed Bio-film Reactors (MBBR) were applied to treat it, one MBBR was run with raw wastewater, the second and third were with synthetic wastewater, and the results were as followings: TN could be removed off completely under the condition of relative low C/N ratio; the C/N ratio of removed pollutants was liner correlation with C/N ratio of influent, but the C/N ratio of effluent was increase violently, the above results demonstrated that, the external carbon source, necessary to the heterotrophic bacteria, was consumed more rapidly than nitrate nitrogen in initial denitrifying stage, then the nitrogen was utilized much more rapidly at later stage, and the ratio of C/N denitrification behaved as a chamfer linear.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"47 1","pages":"305-309"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86895968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.12783/ISSN.1544-8053/14/1/28
Da-jun Zhao, Sun Zihang, Yan Zhao, Xiaoshu Lü, Xianfeng Tan
Fluid field can have significant effects on corrosion rates of steels. The objective of this paper is to investigate erosion-corrosion mechanisms of J55 steel and the effects of local hydrodynamic factors, in particular, the fluid flow velocity on J55 steel’s service life. A new experimental setup was developed to specifically simulate the actual hydrodynamic conditions of Huanghe (Yellow) River valley. Computational fluid dynamics (CFD) model was adopted to characterize the hydrodynamic factors, such as the flow rate, the turbulence kinetic energy and the shear stress, and their effects on the corrosion behavior of J55 steel. Corrosion morphology was analyzed. Results show that the erosion rate increased with the flow rate and the resulting corrosion pit became smaller and deeper. Through the research results of this paper, it could provide some technical supports for the scientific and rational exploitation of brine.
{"title":"Experimental Study and Numerical Modeling of Erosion-corrosion of J55 Steel in Brine of Huanghe (Yellow) River Valley","authors":"Da-jun Zhao, Sun Zihang, Yan Zhao, Xiaoshu Lü, Xianfeng Tan","doi":"10.12783/ISSN.1544-8053/14/1/28","DOIUrl":"https://doi.org/10.12783/ISSN.1544-8053/14/1/28","url":null,"abstract":"Fluid field can have significant effects on corrosion rates of steels. The objective of this paper is to investigate erosion-corrosion mechanisms of J55 steel and the effects of local hydrodynamic factors, in particular, the fluid flow velocity on J55 steel’s service life. A new experimental setup was developed to specifically simulate the actual hydrodynamic conditions of Huanghe (Yellow) River valley. Computational fluid dynamics (CFD) model was adopted to characterize the hydrodynamic factors, such as the flow rate, the turbulence kinetic energy and the shear stress, and their effects on the corrosion behavior of J55 steel. Corrosion morphology was analyzed. Results show that the erosion rate increased with the flow rate and the resulting corrosion pit became smaller and deeper. Through the research results of this paper, it could provide some technical supports for the scientific and rational exploitation of brine.","PeriodicalId":17101,"journal":{"name":"Journal of Residuals Science & Technology","volume":"37 1","pages":"235-243"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84911130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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