检索结果-南通市图书馆

Increased Effluent Dosage Effects on on-site Wastewater Treatment Systems of Differing Architecture Type

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Protection 2015年第6期6卷 651-670页

作者： Andrew Gibbons Kristofor R. Brye Sam Dunn Edward E. Gbur Andrew N. Sharpley Wen Zhang Department of Crop Soil and Environmental Sciences University of Arkansas Fayetteville AR USA Franklin County Health Unit Ozark AR USA Agricultural Statistics Laboratory University of Arkansas Fayetteville AR USA Department of Civil Engineering University of Arkansas Fayetteville AR USA

Approximately 20% of homes nationwide use an on-site treatment system as a form of household wastewater management. However, approximately 10% to 20% of on-site treatment systems malfunction each year, many of which have either failed or exceeded the soil’s long-term acceptance rate (LTAR), causing environmental and human health risks. The objective of this field study was to evaluate the effects of soil condition (e.g., wet and dry) and product architecture type [i.e., chamber, gravel-less-pipe (GLP), polystyrene-aggregate, and pipe-and-aggregate] on in-product solution storage and biomat thickness in a profile-limited soil in northwest Arkansas under increased loading rates and to estimate the LTAR for each product. During Phase I of this study (March 13 to October 4, 2013), effluent loading rates were approximately doubled, while rates were approximately quadrupled during Phase II (October 8, 2013 to May 29, 2014), from the maximum allowable loading rate for each product. The pipe-and-tire-chip, 46-cm-wide trench pipe-and-gravel, and the 25-cm diameter GLP products had the greatest (p < 0.001), while the 31-cm-width and the 5.4-m-long chambers had the lowest (p < 0.001) in-product solution storage during wet-soil conditions of Phase I monitoring. The 25-cm diameter GLP product had the greatest (p < 0.001), while the 61-cm-width, 5.4-m-long chamber had the lowest (p < 0.001) in-product solution storage during Phase II. Results of this study indicate that some alternative products may be able to effectively handle effluent loading rates in excess of those currently allowed by the State of Arkansas. Further research will be required to confirm these interpretations.

关键词： on-site Wastewater Ozark Highlands Profile-Limited Soil Wastewater Treatment

on-site Calibration Method of Dosimeter Based on X-Ray Source

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

World Journal of Nuclear Science and Technology 2017年第2期7卷 93-102页

作者： Wenhui Lv Huiping Guo Ning Lv Chenyang Tian Kuo Zhao Xiaotian Wang Yijie Hou Xi’an Research Institute of Hi-Tech Xi’an China

The real-time monitoring of environmental radiation dose for nuclear fa-cilities is an important part of safety, in order to guarantee the accuracy of the monitoring results regular calibration is necessary. Around nuclear facilities there are so many environmental dosimeters installed dispers-edly, because of its huge quantity, widely distributed, and in real-time monitoring state;it will cost lots of manpower and finance if it were tak-en to calibrate on standard laboratory;what’s more it will make the en-vironment out of control. To solve the problem of the measurement ac-curacy of the stationary gamma radiation dosimeter, an on-site calibra-tion method is proposed. The radioactive source is X-ray spectrum, and the dose reference instrument which has been calibrated by the national standard laboratory is a high pressure ionization. on-site calibration is divided into two parts;firstly the energy response experiment of dosim-eter for high and low energy is done in the laboratory, and the energy response curve is obtained combining with Monte Carlo simulation;sec-ondly experiment is carried out in the field of the measuring dosimeter, and the substitution method to calibrate the dosimeter is used;finally the calibration coefficient is gotten through energy curve correction. In order to verify the accuracy of on-site calibration method, the calibrated dosimeter is test in the standard laboratory and the error is 3.4%. The re-sult shows that the on-site calibration method using X-ray is feasible, and it can improves the accuracy of the measurement results of the stationary γ-ray instrument;what’s more important is that it has great reference value for the radiation safety management and radiation environment evaluation.

关键词： X Ray Source on-site Calibration Energy Response Gamma Radiation Dosimeter

Monitoring biofouling based on aerobic respiration in reverse osmosis system

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

Journal of Environmental Sciences 2019年第4期31卷 247-256页

作者： Youngjae Yu Keun-Young Park Jaehyun Jung Wonjung Song Jaehyeok Kim Junhee Ryu Harshad Lade Jihyang Kweon Department of Environmental Engineering Konkuk University Department of Environment and Energy Sejong University Department of Laboratory Medicine Hallym University Medical Center

A monitoring method of biofouling in reverse osmosis(RO) system was proposed based on the fluorescent signal of resorufin, which is reduced by nicotinamide adenine dinucleotide released from viable cells during aerobic respiration. The fluorescent signal of resorufin reduced by planktonic cells and microorganisms of biofilm showed linearity, indicating its feasibility to monitor biofouling in a RO system. For the application of the method to the lab-scale RO system, the injection concentration of resazurin and the injection flow rate were optimized. Biofilm on RO membranes continuously operated in a lab-scale RO system was estimated by resorufin fluorescence under optimized detection condition. As a result,resorufin fluorescence on RO membrane showed a significant increase in which the permeability of RO system decreased by 30.48%. Moreover, it represented the development of biofilm as much as conventional biofilm parameters such as adenosine triphosphate,extracellular polymeric substances, and biofilm thickness. The proposed method could be used as a sensitive and low-cost technology to monitor biofouling without autopsy of membranes.

关键词： on-site monitoring Biofilm Aerobic respiration Resazurin reduction mechanism Resorufin fluorescence

Stimulatory effects of biosurfactant produced by Pseudomonas aeruginosa BSZ-07 on rice straw decomposing

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第8期20卷 975-980页

作者： Qiuzhuo ZHANG[a], Weimin CAI[a][b] Juan WANG[a] [a]Department of Environmental Science Engineering Harbin Institute of Technology Harbin 150090 China [b]School of Environmental Science Engineering Shanghai Jiao Tong University Shanghai 200240 China

Biosurfactant,produced by Pseudomonas aeruginosa BSZ-07,was added to the dee straw decomposing process to enhance the production of reducing sugars.Observed by Fourier Transform InfraRed(FT-IR)and Nuclear Magnetic Resonance(NMR)analysis, the purified biosurfactant was considered as a mixture of RL1 and RL2,which are two different types of rhamnolipids.Two different adding methods,adding the purified rhamnolipid and the on-site production of it were compared.The results showed that 0.5 g/L was the optimum co...

关键词： biosurfactant rhamnolipid on-site rice straw decomposing

Preparation and application of microfluidic SERS substrate:Challenges and future perspectives

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第2期37卷 96-103页

作者： Jiuchuan Guo Fanyu Zeng Jinhong Guo Xing Ma School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Flexible Printed Electronic Technology Center School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China

Surface-enhanced Raman spectroscopy(SERS),as a highly sensitive molecular analysis technique,can realize fast and non-destructive detection of the information of molecular bonds to identify the component of analytes by"fingerprint"identification.The preparation of SERS substrates plays an extremely important role in the development of SERS technology and the application of SERS detection.By integrating SERS enhancement substrates into microfluidic chips,researchers have developed the microfluidic SERS chips which expand the function of microfluidic chips and provide an efficient platform for on-site biochemical analysis equipped with the powerful sensing capability of SERS technique.In this paper,we will first briefly give a review of the current microfluidic SERS-active substrates preparation technology and present the perspective on the application prospects of microfluidic SERS-active substrates.And then the challenges in the preparation of microfluidic SERS-active substrates will be pointed out,as well as realistic issues of using this technology for biochemical application.

关键词： SERS substrate Microfluidics Biochemical sensing on-site analysis

Overburden management in open pits: options and limits in large limestone quarries

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2019年第2期29卷 217-228页

作者： Claudio Oggeri Taddeo Maria Fenoglio Alberto Godio Raffaele Vinai Department of Environment Land and Infrastructure Engineering Politecnico di Torino College of Engineering Mathematics and Physical Sciences University of Exeter

The management of overburden is an important task in open pit exploitations. site topography and morphology as well as geological and geotechnical properties of natural and remoulded materials are the most important factors affecting the disposal phase. Economic and environmental requirements must be followed in order to achieve the best reclamation results, keeping into account site constraints such as slope stability, hauling and dumping issues, and interactions with groundwater. This paper deals with the above mentioned issues, illustrating a rational approach applied on the case of a large limestone quarry where the thickness of the overburden is relevant and the spoil material has to be dumped in a flooded pit. The proposed multidisciplinary approach led to the selection of most suitable methods for excavation, transportation and disposal. The selection was based on a detailed laboratory and site characterisation that defined favorable and adverse factors to be considered during the preliminary study of a large quarrying project.

关键词： Open pit Overburden Soil testing Limestone quarry Muck on-site testing

A Quantitative Evaluation of Shale Gas Content in Different Occurrence States of the Longmaxi Formation: A New Insight from Well JY-A in the Fuling Shale Gas Field,Sichuan Basin

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2019年第2期93卷 400-419页

作者： TANG Ling SONG Yan LI Qianwen PANG Xiongqi JIANG Zhenxue LI Zhuo TANG Xianglu YU Hailong SUN Yue FAN Shichao ZHU Lin State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum The Unconventional Natural Gas Institute China University of Petroleum Sinopec Petroleum Exploration and Production Research Institute

Comprehensive quantitative evaluation of shale gas content and the controlling factors in different occurrence states is of great significance for accurately assessing gas-bearing capacity and providing effective well-production strategies. A total of 122 core samples from well JY-A in the Fuling shale gas field were studied to reveal the characteristics of S_1 l shale,15 of which were selected to further predict the shale gas content in different occurrence states, which are dependent on geological factors in the thermal evolution process. Geological parameters were researched by a number of laboratory programs, and the factors influential in controlling shale gas content were extracted by both PCA and GRA methods and prediction models were confirmed by the BE method using SPSS software. Results reveal that the adsorbed gas content is mainly controlled by TOC, Ro, SSA, PD and pyrite content, and the free gas content is mainly controlled by S_2, quartz content, gas saturation and formation pressure for S_1 l in well JY-A. Three methods, including the on-site gas desorption method, the empirical formula method, and the multiple regression analysis method were used in combination to evaluate the shale gas capacity of well JY-A, all of which show that the overall shale gas content of well JY-A is in the range of 2.0–5.0 m^3/t and that the free gas ratio is about 50%, lower than that of well JY-1. Cause analysis further confirms the tectonics and preservation conditions of S_1 l in the geological processes, especially the influence of eastern boundary faults on well JY-A, as the fundamental reasons for the differences in shale gas enrichment in the Jiaoshiba area.

关键词： shale gas content on-site gas desorption multiple regression analysis controlling factors Longmaxi shales Fuling shale gas field Jiaoshiba area

Facile on-site Aqueous Pollutant Monitoring Using a Flexible, Ultra-light and Robust SERS Substrate: Interface Self-Assembly of Au@Ag Nanocubes on Polyvinyl Chloride Template

在线全文

学校读者我要写书评

暂无评论

Facile On-site Aqueous Pollutant Monitoring Using a Flexible...

Review of the Regulatory Requirements for the Maintenance of Aerobic Treatment Units and Greywater Treatment Systems in Western Australia

中国化学会第十三届全国分析化学年会

作者： Lu-Bin Zhong Qin Liu Peng Wu Yu-Ming Zheng CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences

Aquatic ecosystem and human health have been seriously threatened by the illegal or uncontrolled discharge of hazardous contaminants into surface or ground water.1 In this study, a novel facile method for on-site and long-term monitoring of pollutants in water by surface enhanced Raman spectroscopy（SERS） was explored based on a novel SERS substrate. The novel SERS substrate was designed and fabricated via a simple procedure, interface self-assembly of ordered Au@Ag nanocubes（NCs） layers on a simultaneously formed polyvinyl chloride（PVC） template, followed by coating a thin Au-film. The as-prepared Au@Ag@Au-NCs/PVC film was demonstrated to be flexible ultra-light and robust, which make it could float on the water surface and firmly contact with aqueous solution even under harsh environmental conditions. Simulated experiments illustrated Raman signals of thiram in water can be instantly and consecutively detected using the Au@Ag@Au-NCs/PVC film as a SERS substrate. In summary, the Au@Ag@Au-NCs/PVC film has great potentials in long-term on-site monitoring of pollutants in aqueous environment.

关键词： on-site SERS Monitoring Pollutants

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2015年第17期7卷 1502-1515页

作者： Tessa McGrath Natalia Shishkina Richard Theobald Clemencia Rodriguez School of Civil and Resource Engineering The University of Western Australia Perth Australia Department of Health Government of Western Australia Perth Australia

Aerobic Treatment Units (ATU) and Greywater Treatment Systems (GTS) are onsite wastewater treatment systems (OWTS) designed to treat wastewater to secondary effluent quality standards. Consequently, the electrical, mechanical and chemical components of these OWTS need to be regularly maintained to ensure their consistent and reliable operation to the required standards. In Western Australia (WA), the Department of Health set out the regulatory requirements for the maintenance of OWTS as well as when and how it is to occur. This paper reviews the maintenance requirements for ATU and GTS in WA and provides recommendations for the proposed changes in guidelines and regulations. State and national guidelines were reviewed and information from industry and regulators was obtained through surveys. The review found that although the guidelines are generally satisfactory there are a number of areas which could be improved and specific recommendations are discussed.

关键词： on-site Wastewater System Wastewater Management Environmental Health Regulatory Requirements Maintenance