检索结果-南通市图书馆

Simulation of long-term nutrient removal in a full-scale closed-loop bioreactor for sewage treatment： an example of Bayesian inference

引用

Frontiers of environmental Science & Engineering 2015年第3期9卷 534-544页

作者： Zheng LI Rong QI Wei AN Takashi MINO Tadashi SHOJI Willy VERSTRAETE Jian GU Shengtao LI Shiwei XU Min YANG State Key Laboratory of environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100086 China Socio-Cultural environmental Studies the University of Tokyo Kashiwa City 277-8563 Japan environmental Science research Laboratory Central Research Institute of Electric Power Industry Chiba 270-1194 Japan Laboratory of Microbial Eco.ogy and Technology (LabMET) Ghent University Gent 9000 Belgium Beijing Drainage Group co. Ltd Beijing 100044 China

In this study, the performance of nitrogen and phosphorus removal in a full-scale closed-loop bioreactor （oxidation ditch） system was simulated using the ASM2d model. Routine data describing the process for two years were co.piled for calibration and validation. To overco.e the identifiability problem, the classic Bayesian inference approach was utilized for parameter estimation. The calibrated model co.ld describe the long-term trend of nutrient removal and short-term variations of the process performance, showing that the Bayesian method was a reliable and useful tool for the parameter estimation of the activated sludge models. The anoxic phosphate uptake by polyphosphate accumulating organisms （PAO） co.tributed 71.2% of the total Poly-P storage, which reveals the dominance of denitrifying phosphorus removal process under the oxygen limiting co.ditions. It was found that 58.7% of the anoxic Poly-P storage and denitrification by PAO in the reactor was achieved in the aerated co.partment, implying that the PAO＇s anoxic activity was significantly stimulated by the low dissolved oxygen （DO） level in this co.partment due to the oxygen gradient caused by brush aerator.

关键词： activated sludge model Bayesian inference biological nutrient removal closed-loop bioreactor oxidation ditch denitrifying polyphosphate accumulating organisms

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Suggestion on further strengthening ultra-low emission standards for PM emission from co.l-fired power plants in China

引用

Journal of environmental Sciences 2023年第1期123卷 203-211页

作者： Jianguo Deng Shumin Wang Jiawei Zhang Yi Zhang Jingkun Jiang Yongzheng Gu Tao Han Lei Feng Jian Gao Lei Duan School of Environment Tsinghua UniversityBeijing 100084China China Energy Investment co. Ltd.Beijing 100011China Guodian Power Development co. Ltd.Beijing 100101China CHN ENERGY New Energy Technology research Institute co. Ltd.Beijing 102209China Chinese research Academy of environmental Sciences Beijing 100012China

China has established the largest clean co.l-fired power generation system in the world by acco.plishing the technological transformation of co.l-fired power plants(CFPPs)to achieve ultra-low *** potential for further particulate matter(PM)emission reduction to achieve near-zero emission for CFPPs has beco.e a hotspot *** this study,PM emission from some ultra-low emission CFPPs adopting advanced air pollutant co.trol technologies in China was *** results revealed that the average filterable particulate matter(FPM)co.centration,measured as the total particulate matter(TPM)acco.ding to the current national monitoring standard,was(1.67±0.86)mg/m^(3),which co.ld fully achieve the ultra-low emission standard for key regions(5 mg/m^(3)),but that achieving the near-zero emission standard was difficult(1 mg/m^(3)).However,the co.densable particulate matter(CPM),with an average co.centration of(1.06±1.28)mg/m^(3),was generally ignored during monitoring,which led to about 38.7%underestimation of the *** co.sidering both FPM and CPM,the TPM emission from current CFPPs would co.tribute to less than 5%of atmospheric PM_(2.5) co.centrations in the key cities and regions in ***,further reduction in FPM emission proposed by the near-zero emission plan of CFPPs may have less environmental benefit than emission co.trol of other anthropogenic ***,it is suggested that the management of CPM emission should be strengthened,and a national standard for CPM emission monitoring based on the indirect dilution method should be established for *** measurements are helpful for optimal operation of air pollutant co.trol devices and co.tinuously promoting further emission reduction.

关键词： Near-zero emission co.densable particulate matter(CPM) Indirect dilution Emission standard Technical specification for emission monitoring

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Operating co.dition influences on PCDD/Fs emissions from sinter pot tests with hot flue gas recycling

引用

Journal of environmental Sciences 2012年第5期24卷 875-881页

作者： Yongmei Yu Minghui Zheng Xianwei Li Xiaolei He State Key Laboratory of environmental Chemistry and Eco.oxico.ogy Research Center for Eco-Environmental Sciences Chinese Academy of Sciences P.O. Box 2871 Beijing 100085 China research Institute of Baoshan Iron & Steel co. Ltd. Shanghai 201900 China

This study was designed to clarify the influence of operating co.ditions on the formation and emissions of polychlorinated-p-dibenzodioxins and dibenzofurans （PCDD/Fs） from a sintering process with hot flue gas recycling. A pilot scale sinter pot with simulated flue gas recycling was developed, and four key operational parameters, including temperature, oxygen co.tent of the simulated waste flue gas, the co.e rate of the sintering mixture, and the quicklime quality, were selected for exploring PCDD/Fs formation. The results showed that the temperature of the recycled flue gas had a major affect on PCDD/Fs formation, and a high temperature co.ld significantly increase their formation during sintering. A clear linear co.relation between the temperature of recycling flue gas and PCDD/Fs emission （r = 0.93） was found. PCDD/Fs co.ld be reduced to a certain extent by decreasing the level of oxygen in the recycled flue gas, while sintering quality was unchanged. The co.e rate had no significant influence on the formation of PCDD/Fs, but the quality of quicklime used in the sintering mixture co.ld affect not only the amount of PCDD/Fs emissions but also the sintering productivity. co.pared with a benchmark sinter pot test, PCDD/Fs emissions markedly decreased with improvements to quicklime quality. However, the reduction in PCDD/Fs emissions realized by using high-quality quicklime was limited by the temperature of the inlet gas. The highest reduction achieved was 51% co.pared with co.ventional quicklime when the temperature of the inlet gas was 150°C.

关键词： PCDD/Fs sintering recycling flue gas formation mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on the transport of suspended sediment in an open channel flow with permeable spur dikes

引用

International Journal of Sediment research 2011年第1期26卷 96-111页

作者： Ryosuke AKAHORI Syunsuke IKEDA Civil Engineering research Institute for co.d Region Public Works Research InstituteJapan CTI Engineering co. Ltd.JapanTokyo Institute of TechnologyJapan

The transport of suspended sediment in rivers with spur dikes is an important issue for bank protection and environmental *** experiments were performed to study the characteristics of the flow and the transport of suspended sediment in an open channel with permeable ***,the essentials of these characteristics were studied by co.paring results of flume experiments on permeable and impermeable *** influence of the aspect ratio(d/l) of the interval between dikes(d) to the length of dikes(l) on these characteristics was then *** these experiments,the properties of horizontal eddies,turbulence structures,and suspended sediment co.centrations were *** results show that the development of large-scale horizontal eddies requires some distance in a shear layer for permeable dikes,although they are periodically generated from the first dike in the case of impermeable *** basic structures of horizontal eddies are independent of the aspect ratio in the equilibrium region for permeable *** suspended sediment co.centrations for cases of permeable dikes gradually decrease between the several upstream dikes and they approach a uniform distribution in the downstream region,although those in the case of the impermeable dikes are relatively uniform in the downstream direction.

关键词： Suspended sediment Permeable spur dike Eddy structure Velocity distribution Power spectrum

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

[co.struction of a 17 β-estradiol sensor based on a magnetic graphene oxide/aptamer separating material]

引用

Se pu = Chinese journal of chromatography 2025年第1期43卷 87-95页

作者： Xin-Yu Jin Le-Yuan Chen Ya-Nna Liu Wen-Jing Xie Han-Yong Peng State Key Laboratory of environmental Chemistry and Eco.oxico.ogy Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China. University of Chinese Academy of Sciences Beijing 100049 China. School of Environment Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 China.

17-Estradiol (E2) is a natural steroidal estrogen essential for a variety of physiological functions in organisms. However, external E2, which is renowned for its potent biological effects, is also co.sidered to be an endocrine-disrupting co.pound (EDC) capable of disturbing the normal operation of the endocrine system, even at nanogram-per-liter (ng/L) co.centrations. Studies have revealed that medical and livestock wastewater can be co.taminated with E2, which poses potential risks to human health. Currently, the primary method for detecting E2 relies on liquid chromatography-mass spectrometry, which is limited with regard to on-site or large-scale sample testing due to instrumental co.straints. Herein, we developed a magnetic graphene oxide (MGO)/aptamer separating material. The MGO was synthesized by creating a water-in-oil microemulsion at 90 ℃, an agarose hydrogel to load the FeO nanoparticles, and layered graphene oxide (GO). In co.trast to co.ventional methods, such as chemical co.precipitation and solvothermal approaches, this method is more time-efficient and does not require high temperature or pressure. Moreover, the use of a physical encapsulation technique for enwrapping the FeO nanoparticles and layered GO eliminates the need for chemical modification. This approach reduces the use of harmful chemicals, ensures co.plete loading, and results in highly efficient encapsulation. The MGO was characterized using Fourier-transform infrared (FT-IR) spectrosco.y and transmission electron microsco.y (TEM), as well as dynamic light scattering (DLS) and Zeta potential analyses, which revealed that the FeO nanoparticles had been successfully loaded onto the GO to produce MGO particles mainly around 5 μm in size. Additionally, this study demonstrated that the aqueous MGO dispersion is highly stable. This substance was used to develop a fluorescent biosensor that uses a "turn-on" mechanism to rapidly and highly sensitively detect E2. MGO is capable of adsorbing a fl

关键词： 17-estradiol (E2) fluorescence biosensor magnetic graphene oxide (MGO) magnetic solid phase separation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Characterization of personal exposure co.centration of fine particles for adults and children exposed to high ambient co.centrations in Beijing, China

引用

Journal of environmental Sciences 2010年第11期22卷 1757-1764页

作者： Xuan Du Qian Kong Weihua Ge Shaojun Zhang Lixin Fu Department of environmental Science and Engineering Tsinghua University Beijing 100084 China Xi' an Municipal Engineering Design and research Institute co. Ltd. Xi'an 710068 China

In China, the health risk from overexposure to particles is beco.ing an important public health co.cern. To investigate daily exposure characteristics to PM 2.5 with high ambient co.centration in urban area, a personal exposure study was co.ducted for school children, and office workers in Beijing, China. For all participants （N = 114）, the mean personal 24-hr exposure co.centration was 102.5, 14.7, 0.093, 0.528, 0.934, 0.174 and 0.703 μg/m 3 for PM 2.5 , black carbon, Mn, Al, Ca, Pb, and Fe. Children’s exposure co.centrations of PM 2.5 were 4–5 times higher than those in related studies. The ambient co.centration of PM 2.5 （128.5 μg/m 3 ） was significantly higher than the personal exposure co.centration （P 0.05）, and exceed the reference co.centration （25 μg/m 3 ） of WHO air quality guideline. Good co.relation relationships and significant differences were identified between ambient co.centration and personal exposure co.centration. The relationships indicate that the ambient co.centration is the main factor influencing personal exposure co.centration, but is not a good indicator of personal exposure co.centration. Outdoor activities （co.mute mode, exposure to heating, workday or weekend travel） influenced personal exposure co.centrations significantly, but the magnitude of the influence from indoor activities （exposure to co.king） was masked by the high ambient co.centrations.

关键词： personal exposure PM 2.5 high ambient co.centration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Estimation of PM_(10) in the trafc-related atmosphere for three road types in Beijing and Guangzhou, China

引用

Journal of environmental Sciences 2014年第1期26卷 197-204页

作者： Yu Wang Jiong Li Xiang Cheng Xiaoxiu Lun Dezhi Sun Xingzu Wang co.lege of environmental Science and Engineering Beijing Forestry University Beijing Northland co.struction Engineering co. Ltd

The levels of roadside PM10 in Beijing, China, were investigated in 2011 and 2012 on a seasonal basis to estimate the population exposure to particulates for three road types. The measurements of PM10 were also co.ducted in the southern Chinese megacity of Guangzhou for co.parison purposes. The results showed that roadside PMlo in Beijing co.related strongly with the PM10 background in the urban atmosphere. The levels of PM10 in street canyons were markedly higher than those along the open roads and in crossroad areas because of limited ventilation. An elevation of PM10 was observed in April, which was possibly due to the sand storms that frequently occur in the spring. Based on these observations, roadside PM10 in Beijing co.ld have multiple origins and was to some extent dispersion- governed. In Guangzhou, the roadside PM10 did not closely relate to the background values. The PM10 pollution was greatly affected by local traffic co.ditions. The simulation of PM10 for different road types was co.pleted during the study period using the Motor Vehicle Emissions Factor Model （MOBILE6.2） as an emission model and the California Line Source Dispersion Model （CALINE4） and Operational Street Pollution Model （OSPM） as dispersion models. The MOBILE6.2/CALINE4 software package was demonstrated to be sufficient for the simulation of PM10 in the open roads and crossroad areas in both Beijing and Guangzhou, and the simulation results of roadside PM10 in the street canyons by the MOBILE6.2/OSPM package were in close agreement with those of the measurements.

关键词： roadside PM10 traffic volume open road crossroad street canyon

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preliminary Study to Identify Criterion for Quench Crack Prevention by co.puter Simulation

引用

材料热处理学报 2004年第5期25卷 486-493页

作者： Kyozo Arimoto Fumiaki Ikuta Takashi Horino Shigeyuki Tamura Michiharu Narazaki Yoshio Mikita Arimotech Ltd. Osaka Japan Neturen Co. Ltd. Kanagawa JapanNeturen Co. Ltd. Kanagawa JapanCRC Solutions Corp. Tokyo JapanUtsunomiya University Utsunomiya JapanMIKITA Professional Engineer Office Tokushima Japan

A criterion for preventing quench cracks has not been established although much research has been co.ducted in this field. A few predictions of cracking have been recently reported using simulated results of heat treatment processes. However, these results were insufficient to predict crack generation clearly because the mechanism relates not only to stress distributions in the parts but also to material characteristics. Systematic studies by the co.bination of experiment and simulation are therefore required to reliably identify a criterion for crack prevention by co.puter simulation. As a preliminary work before starting the full-scale research, a review of quench cracking research was co.ducted and existing test methods were classified. Several test results for cylindrical specimens were simulated for co.sidering a cause of the crack generation. Lastly a tentative plan was made for the future research.

关键词：淬火裂纹热处理计算机模拟防止方法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Destruction of hexafluoroethane in a dielectric-packed bed plasma reactor

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第7期11卷 538-544页

作者： D. H. KIM Y. S. MOK S. B. LEE S. M. SHIN Department of Chemical & Biological Engineering Research Institute of Advanced Technology Jeju National University environmental Business Unit Samsung Engineering Co. Ltd. Hwasung Gyeonggido Korea

The destruction of hexafluoroethane (C2F6), also known as R-116, was investigated in a nonthermal plasma reactor packed with dielectric pellets. The effects of the feed gas co.position and the input power on the destruction of C2F6 were examined. The feed gas co.position was varied by changing the oxygen co.tent, the argon co.tent and the initial C2F6 co.centration. An increased input power led to increased C2F6 destruction as a result of promoting the electron-molecule co.lisions to dissociate C2F6 molecules. The addition of argon to the feed gas greatly improved the C2F6 destruction by reducing the energy losses due to vibrational excitation and dissociation of N2 molecules, while the increases in the oxygen co.tent and the initial C2F6 co.centration decreased the destruction efficiency. The byproducts including co., co. co.2, CF4, SiF4, NO2, and N2O were identified, and the destruction mechanisms were elucidated, referring to these co.pounds. The most abundant byproduct was found to be carbonyl fluoride (co.2), indicating that it serves as an important medium to co.vert C2F6 into co.. The energy requirement for the C2F6 destruction was in the range of 8.2–45.3 MJ/g, depending on the initial co.centration.

关键词： Hexafluoroethane (C2F6) Nonthermal plasma Gas co.position Destruction mechanisms

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Solid Solution Treating on the Microstructureand Damping Behaviour of MnCuNiFe Alloys

引用

Journal of Materials Science & Technology 1998年第4期14卷 299-307页

作者： Yin, Fuxing Ohsawa, Y. Sato, A. Kawahara, K. National research Institute for Metals Tsukuba Ibaraki 305-0047 Japan B.B.Materia co. Ltd. Chiba-Shi Chiba 267-0066 Japan

A high damping co.dition is easily obtained in Mn-(16-24) Cu-(4-6) Ni-2Fe (at. pct) alloys, when co.ling rate is co.trolled after the solid solution treatment at 1173 K. It was observed that the temperature dependent changes of logarithmic decrement in 10 h co.led samples are sensitive to the alloy co.position. As co.pared with water quenching treatment, co.trolled 10 h co.ling improves T//N temperature of the alloys extensively by producing a Mn-enriched matrix portion in the alloys. Calculations suggest that the relative decreases of Cu and Ni co.tent in the matrix portion be dominated by the Ni co.tent in the original alloys, and therefore, the volume fraction of the Cu, Ni-enriched precipitates is estimated to be about 20% and 10% in the 4Ni and 6Ni alloys, respectively. As a result, the T//N temperature for each alloy, co.responding to the rising temperature of logarithmic decrement, has been related to the Cu, and Ni in the Mn-enriched matrix. The existence of left brace 110 right brace twinning boundaries is co.firmed in the microstructure of both 4Ni and 6Ni alloys. However, the relative lattice strains, which the twinning boundaries act to acco.modate, were found largely different in the two alloys. It is co.sidered that boundaries with smaller orientation deviation can co.rdinate the external stresses easily by cyclic moving, and therefore, the broader damping peak which occurs in the 10 h co.led 6Ni alloy beco.es feasible. Electron diffraction results also indicate possible formation of many sub-crystals in the matrix phase, which are relatively rotated on some invariant planes. Those sub-crystal boundaries might play some attenuation roles in the temperature range between T//N and room temperature. (Edited author abstract) 9 Refs.

关键词： Manganese alloys

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：