检索结果-南通市图书馆

Formation and speciation of disinfection byproducts during chlor(am)ination of aquarium seawater

Journal of Environmental Sciences 2015年第7期27卷 116-124页

作者： Haiting Zhang Huiyu Dong craig adams Zhimin Qiang Gang Luan Lei Wang Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Department of Civil and Environmental Engineering Utah State University Water Quality Analysis and Control Center Department of Life Support Equipments for Aquatic AnimalsBeijing Aquarium

The chemistry associated with the disinfection of aquarium seawater is more complicated than that of freshwater, therefore limited information is available on the formation and speciation of disinfection byproducts（DBPs） in marine aquaria. In this study, the effects of organic precursors, bromide（Br-） and pre-ozonation on the formation and speciation of several typical classes of DBPs, including trihalomethanes（THM4）, haloacetic acids（HAAs）,iodinated trihalomethanes（I-THMs）, and haloacetamides（HAc Ams）, were investigated during the chlorination/chloramination of aquarium seawater. Results indicate that with an increase in dissolved organic carbon concentration from 4.5 to 9.4 mg/L, the concentrations of THM4 and HAAs increased by 3.2-7.8 times under chlorination and by 1.1-2.3 times under chloramination. An increase in Br-concentration from 3 to 68 mg/L generally enhanced the formation of THM4, I-THMs and HAc Ams and increased the bromine substitution factors of all studied DBPs as well, whereas it impacted insignificantly on the yield of HAAs. Pre-ozonation with 1 mg/L O3 dose substantially reduced the formation of all studied DBPs in the subsequent chlorination and I-THMs in the subsequent chloramination. Because chloramination produces much lower amounts of DBPs than chlorination, it tends to be more suitable for disinfection of aquarium seawater.

关键词： Disinfection byproducts Chlorination Chloramination Pre-ozonation Bromine substitution factorAquarium seawater

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

Simultaneous removal of ammonia and N-nitrosamine precursors from high ammonia water by zeolite and powdered activated carbon

引用

Journal of Environmental Sciences 2018年第2期30卷 82-91页

作者： Runmiao Xue Ariel Donovan Haiting Zhang Yinfa Ma craig adams John Yang Bin Hua Enos Inniss Todd Eichholz Honglan Shi Department of Chemistry and Environmental Research Center Missouri University of Science and Technology RoIIa MO 65409 USA Center for Single Nanoparticle Single Cell and Single Molecule Monitoring (CS3M) Missouri University of Science and Technology RollaMO 6S409 USA Department of Civil Engineering Saint Louis University St. Louis MO 63103 USA Department of Agriculture and Environmental Sciences Lincoln University of Missouri Jefferson City MO 65101 USA Department of Civil & Environmental Engineering University of Missouri-Columbia Columbia MO 65211 USA Missouri Department of Natural Resources Jefferson City MO 65102 USA

When adding sufficient chlorine to achieve breakpoint chlorination to source water containing high concentration of ammonia during drinking water treatment, high concentrations of disinfection by-products（DBPs） may form. If N-nitrosamine precursors are present, highly toxic N-nitrosamines, primarily N-nitrosodimethylamine（NDMA）, may also form. Removing their precursors before disinfection should be a more effective way to minimize these DBPs formation. In this study, zeolites and activated carbon were examined for ammonia and N-nitrosamine precursor removal when incorporated into drinking water treatment *** test results indicate that Mordenite zeolite can remove ammonia and five of seven N-nitrosamine precursors efficiently by single step adsorption test. The practical applicability was evaluated by simulation of typical drinking water treatment processes using six-gang stirring system. The Mordenite zeolite was applied at the steps of lime softening, alum coagulation, and alum coagulation with powdered activated carbon（PAC） sorption. While the lime softening process resulted in poor zeolite performance, alum coagulation did not impact ammonia and N-nitrosamine precursor removal. During alum coagulation, more than67% ammonia and 70%–100% N-nitrosamine precursors were removed by Mordenite zeolite（except 3-（dimethylaminomethyl）indole（DMAI） and 4-dimethylaminoantipyrine（DMAP））. PAC effectively removed DMAI and DMAP when added during alum coagulation. A combination of the zeolite and PAC selected efficiently removed ammonia and all tested seven N-nitrosamine precursors（dimethylamine（DMA）, ethylmethylamine（EMA）, diethylamine（DEA）, dipropylamine（DPA）, trimethylamine（TMA）, DMAP, and DMAI） during the alum coagulation process.

关键词： Disinfection by-products Drinking water treatment Ammonia removal by zeolite N-nitrosodimethylamine(NDMA) N-nitrosamines N-nitrosamine precursor removal by zeolite and powdered activated carbon

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

污泥龄对活性污泥处理微量磺胺类药物的影响

引用

重庆大学学报（自然科学版） 2012年第6期35卷 63-71页

作者：杨程郭劲松 Belinda S.M.Sturm Rachael F.Lane craig D.adams Ray E.Carter 重庆大学城市建设与环境工程学院重庆400045 关国堪萨斯大学土木建筑与环境工程学院美国堪萨斯州劳伦斯66045

为了研究污泥龄对活性污泥系统处理微量磺胺类药物(5μg/L)的影响,共运行了4个试验室规模(3L)的序批式活性污泥反应器(SBR),其污泥龄分别为2、8、14、20d。批次摇瓶试验通过设置3个工况(正常运行,加入生物抑制剂,无微生物)来讨论在1个... 详细信息

为了研究污泥龄对活性污泥系统处理微量磺胺类药物(5μg/L)的影响,共运行了4个试验室规模(3L)的序批式活性污泥反应器(SBR),其污泥龄分别为2、8、14、20d。批次摇瓶试验通过设置3个工况(正常运行,加入生物抑制剂,无微生物)来讨论在1个运行周期(8h)中对浓度为5μg/L磺胺甲恶唑的吸附作用、生物降解作用和挥发损失。试验结果显示对磺胺甲恶唑的总去除量为2.14±0.60μg/g SS,吸附作用占总去除量的63%;磺胺嘧啶为1.14±0.63μg/g SS,83%;磺胺间二甲氧为2.33±0.67μg/g SS,35%;磺胺甲基嘧啶为2.45±0.85μg/g SS,55%;磺胺类药物的去除效果与污泥的污泥龄有着非常显著的关系(p<0.02)。通过运行加入磺胺甲恶唑(进水5μg/L)的反应器60d,4个反应器对磺胺甲恶唑的平均去除率分别为10%、41%、51%、58%,处理效果随着污泥龄的增加而变好,同时单位污泥去除率随着污泥龄的增加而降低,SRT=2d的反应器由于存在大量的丝状菌,使得单位污泥对磺胺甲恶唑去除率大大高于其他3个反应器。通过分子生物学分析,发现微生物群落结构的变化不大,从而说明了影响磺胺类药物处理效果的主要因素在于更强的吸附能力,更高的污泥浓度。

关键词： DGGE活性污泥系统磺胺类抗生素磺胺甲恶唑污泥龄生物降解生物吸附

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

不同污泥龄对活性污泥系统处理各种药物的影响

引用

中国给水排水 2012年第13期28卷 99-102,108页

作者：杨程郭劲松 Belinda S.M.Sturm Rachael F.Lane craig D.adams Ray E.Carter 重庆大学城市建设与环境工程学院重庆400045 美国堪萨斯大学土木建筑与环境工程学院

运行4个实验室规模(3 L)的序批式活性污泥反应器(SBR),其污泥龄(SRT)分别为2、8、14、20 d。批次摇瓶试验通过设置3个工况(正常运行、加入生物抑制剂、无微生物)来讨论5种污泥(4个SBR和当地污水处理厂)对浓度为5μg/L的10种药物的处理效... 详细信息

运行4个实验室规模(3 L)的序批式活性污泥反应器(SBR),其污泥龄(SRT)分别为2、8、14、20 d。批次摇瓶试验通过设置3个工况(正常运行、加入生物抑制剂、无微生物)来讨论5种污泥(4个SBR和当地污水处理厂)对浓度为5μg/L的10种药物的处理效果,以及在一个运行周期(8 h)中吸附作用、生物降解作用和挥发损失的去除贡献。试验结果显示,对乙酰氨基酚、咖啡因基本能被去除,去除率在60%以上,立痛定、磺胺甲恶唑能被部分去除,去除率为30%～55%;降固醇酸、林肯霉素、甲氧苄啶的处理效果不好,去除率<15%。在相同污泥浓度下进行的摇瓶试验结果表明,对4种磺胺类药物的去除率为20%～60%,磺胺甲恶唑、磺胺间二甲氧嘧啶、磺胺甲基嘧啶主要依靠吸附作用去除,磺胺嘧啶则是依靠生物降解作用去除。从单因素方差分析可知,对磺胺类药物的去除效果与污泥龄有着显著的关系(p<0.02)。

关键词：活性污泥系统磺胺类抗生素污泥龄药物

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

Antenna design for a massive multiple input environmental sensor network

引用

Digital Communications and Networks 2016年第4期2卷 256-259页

作者： J. craig Prather Michael Bolt Haley Harrell John Manobianco Mark L. adams Department of Electrical and Computer Engineering 200 Broun Hall Auburn University AL 36849 United States

This article describes the design and simulation of a pair of antennas on a small PCB with minimal coupling for a massive multiple input sensor network. The two antennas are planar inverted-F antennas （PIFA） that are fed with microstrip feed lines. The critical design factors are minimizing mass while creating ISM band and GPS L1 band antennas and developing data transmission schemes for maximum usage of all communication channels. The designed board is a 60 mm diameter, 0.6 mm thick circular FR4 board that weighs approximately 5 g.

关键词： Antenna Environmental sensing Remote sensing Massive multiple input network

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

Massively Deployable, Low-Cost Airborne Sensor Motes for Atmospheric Characterization

引用

Wireless Sensor Network 2020年第1期12卷 1-11页

作者： Michael Bolt J. craig Prather Tyler Horton Mark adams Department of Electrical and Computer Engineering Auburn University Auburn AL USA

A low-cost airborne sensor mote has been designed for deployment en masse to characterize atmospheric conditions. The designed environmental sensing mote, or eMote, was inspired by the natural shape of auto-rotating maple seeds to fall slowly and gather data along its descent. The eMotes measure and transmit temperature, air pressure, relative humidity, and wind speed estimates alongside GPS coordinates and timestamps. Up to 2080 eMotes can be deployed simultaneously with a 1 Hz sampling rate, but the system capacity increases by 2600 eMotes for every second added between samples. All measured and reported data falls within accuracy requirements for reporting with both the World Meteorological Organization (WMO) and the National Oceanic and Atmospheric Administration (NOAA). This paper presents the design and validation of the eMote system alongside discussions on the implementation of a large-scale, low-cost sensor network. The eMote represents unprecedented in-situ atmospheric measurement capabilities with the ability to deploy more than 260 times the number of sensing units as the most comparable commercially available dropsonde.

关键词： Atmospheric Sensing Airborne Biomimetic MF-TDMA

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

Airborne Sensor Network for Atmospheric Profiling

引用

Wireless Sensor Network 2018年第4期10卷 93-101页

作者： Tyler Horton Michael Bolt craig Prather John Manobianco Mark L. adams Department of Electrical and Computer Engineering Auburn University Auburn AL USA

The need for higher spatial/temporal resolution in-situ atmospheric sensing has been established by both weather and climate researchers. In order to address this need, an airborne wireless sensor network called GlobalSense is currently being developed. GlobalSense is based on low-cost airborne probes that collect environmental data as they fall slowly through the atmosphere and on portable base stations that receive the data being collected. This paper presents an overview of this GlobalSense system as well as preliminary results from ground-based system testing.

关键词： Biomimetic Airborne Atmospheric Sensing

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

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

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

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：