检索结果-南通市图书馆

autotrophic denitrification for nitrate and nitrite removal using sulfur-limestone

Journal of Environmental Sciences 2011年第11期23卷 1761-1769页

作者： Weili Zhou Yejue Sun Bingtao Wu Yue Zhang Min Huang Toshiaki Miyanaga Zhenjia Zhang School of Environmental Science and Engineering Shanghai Jiaotong UniversityNo.800Dongchuan RoadMinhang DistrictShanghai 200240China. Nippon Steel Chemical Co. Ltd. 14-1 Sotokanda 4 Chome Chiyoda-Ku Tokyo 101-0021 Japan

Sulfur-limestone was used in the autotrophic denitrification process to remove the nitrate and nitrite in a lab scale upflow *** water with four levels of nitrate and nitrite concentrations of 10,40,70 and 100 mg N/L was *** treating the low concentration of nitrate-or nitrite-contaminated water（10,40 mg N/L）,a high removal rate of about 90% was achieved at the hydraulic retention time（HRT） of 3 hr and temperature of 20-25°*** the same HRT,50% of the nitrate or nitrite could be removed even at the low temperature of 5-10°*** the higher concentration nitrate and nitrite（70,100 mg N/L）,longer HRT was *** batch test indicated that influent concentration,HRT and temperature are important factors afiecting the denitrification *** analysis implied that nitrate and nitrite were denitrified into nitrogen by the same *** sequential two-step-reactions from nitrate to nitrite and from nitrite to the next-step product might have taken place in the same cell during the autotrophic denitrification process.

关键词： nitrate nitrite autotrophic denitrification sulfur-limestone denitrifying bacteria

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

Combined biologic aerated filter and sulfur/ceramisite autotrophic denitrification for advanced wastewater nitrogen removal at low temperatures

引用

Frontiers of Environmental Science & Engineering 2014年第6期8卷 967-972页

作者： Tian WAN Guangming ZHANG Fcngwci DU Junguo HE Pan WU School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China School of Environment & Natural Resource Renmin University of China Beijing 100872 China

An innovative advanced wastewater treatment process combining biologic aerated filter （BAF） and sulfur/ ceramisite-based autotrophic denitrification （SCAD） for reliable removal of nitrogen was proposed in this paper. In SCAD reactor, ceramisite was used as filter and Ca （HCO3）2 was used for supplying alkalinity and carbon source. The BAF-SCAD was used to treat the secondary treatment effluent. The performance of this process was investigated, and the impact of temperature on nitrogen removal was studied. Results showed that the combined system was effective in nitrogen removal even at low temperatures （8℃）. Removal of total nitrogen （TN）, NH4＋ -N, NO3-N reached above 90% at room temperature. Nitrification was affected by the temperature and nitrification at low temperature （8℃） was a limiting factor for TN removal. However, denitrification was not impacted by the temperature and the removal of NO3 -N maintained 98% during the experimental period. The reason of effective denitrification at low temperature might be the use of easily dissolved Ca（HCO3）2 and high-flux ceramisite, which solved the problem of low mass transfer efficiency at low temperatures. Besides, vast surface area of sulfur with diameter of 2-6 mm enhanced the rate of microbial utilization. The removal of nitrate companied with the production of SO42-, and the average concentration of SO27 was about 240mg.L^-1. These findings would be beneficial for the application of this process to nitrogen removal especially in the winter and cold regions.

关键词： autotrophic denitrification biologic aerated filter (BAF) sulfur/ceramisite-based autotrophic denitrification (SCAD) advanced nitrogen removal

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

Control of hydrogen sulfide emissions using autotrophic denitrification landfill biocovers:engineering applications

引用

Frontiers of Environmental Science & Engineering 2011年第2期5卷 149-158页

作者： Daoroong SUNGTHONG Debra R.REINHART Department of Environmental Science Faculty of ScienceSilpakorn UniversityNakhon Pathom73000Thailand Civil Environmental and Construction Engineering DepartmentUniversity of Central FloridaOrlandoFL 32826USA

Hydrogen sulfide(H_(2)S)emitted from construction and demolition waste landfills has received increasing *** its unpleasant odor,longterm exposure to a very low concentration of H_(2)S can cause a public health *** the case of construction and demolition(C&D)waste landfills,where gas collection systems are not normally required,the generated H_(2)S is typically not controlled and the number of treatment processes to control H_(2)S emissions in situ is *** attractive alternative may be to use chemically or biologically active landfill covers.A few studies using various types of cover materials to attenuate H_(2)S emissions demonstrated that H_(2)S emissions can be effectively *** this study,therefore,the costs and benefits of H_(2)S-control cover systems including compost,soil amended with lime,fine concrete,and autotrophic denitrification were *** on a case-study landfill area of 0.04 km^(2),the estimated H_(2)S emissions of 80900 kg over the 15-year period and costs of active cover system components(ammonium nitrate fertilizer for autotrophic denitrification cover,lime,fine concrete,and compost),ammonium nitrate fertilizer is the most cost effective,followed by hydrated lime,fine concrete,and yard waste *** concrete and yard waste compost covers are expensive measures to control H_(2)S emissions because of the large amount of materials needed to create a *** H_(2)S emissions using fine concrete and compost is less expensive at landfills that provide on-site concrete recovery and composting facilities;however,ammonium nitrate fertilizer or hydrated lime would still be more cost effective applications.

关键词： hydrogen sulfide emissions construction and demolition waste autotrophic denitrification landfill biocovers

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

Effect of C/N Ratio,Temperature,pH on autotrophic denitrification Rate with Hydrogen Gas,Iron(Ⅱ) and Sodium Sulfide as Electron Donors

引用

Journal of Harbin Institute of Technology(New Series) 2016年第1期23卷 90-96页

作者： Junfeng Su Sicheng Shao Tinglin Huang Fang Ma Gang Wen Shengchen Zheng Kai Zhang School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental EngineeringHarbin Institute of Technology

Nitrate is considered to be one of the most widely present pollutants leading to eutrophication of environment. The purpose of this work was to isolate and identify new anaerobic denitrifying bacteria from reservoir sediments and utilize different electron donors for isolates to improve nitrate removal efficiency. Using traditional enrichment approach,one purified anaerobic bacterium( Y12) capable of NO-3-N removal from sediments was obtained. The species identity of Y12 was determined via 16 S rRNA gene sequence analysis to be Acinetobacter. In this work,the fastest denitrification rates were observed with ferrous iron as electron ***,slightly slower rates were observed with hydrogen and sodium sulfide as electron donors. However,when used hydrogen gas, ferrous iron and sodium sulfide as electron donors, C / N ratios had little effect on autotrophic denitrification rate at the initial C / N ratio from 1.5 to 9.0. Meanwhile,when made use of hydrogen gas,ferrous iron and sodium sulfide as electron donors,a maximum nitrate removal ratio of 100.00%,91.43%and 87.99% at the temperature of 30 ℃,respectively. Moreover,maximum denitrification activity was observed at p H 6.0-7.0.

关键词： eutrophication electron donor nitrate Acinetobacter sp autotrophic denitrification

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

Bio-reduction of nitrate from groundwater using a hydrogen-based membrane biofilm reactor

引用

Journal of Environmental Sciences 2010年第2期22卷 257-262页

作者： Siqing Xia Fohua Zhong Yanhao Zhang Haixiang Li Xin Yang State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China College of Municipal and Environmental Engineering Shadong Jianzhu University Jinan 250101 China

A hydrogen-based membrane biofilm reactor （MBfR） using H2 as electron donor was investigated to remove nitrate from groundwater. When nitrate was first introduced to the MBfR, denitrification took place on the shell side of the membranes immediately, and the effluent concentration of nitrate continuously decreased with 100% removal rate on day 45 under the influent nitrate concentration of 5 mg NO3^--N/L, which described the acclimating and enriching process of autohydrogenotrophic denitrification bacteria. A series of short-term experiments were applied to investigate the effects of hydrogen pressures and nitrate loadings on deniWification. The results showed that nitrate reduction rate improved as H2 pressure increasing, and over 97% of total nitrogen removal rate was achieved when the nitrate loading increased from 0.17 to 0.34 g NO3^--N/（m^***） without nitrite accumulation. The maximum deniwification rate was 384 g N/（m^***）. Partial sulfate reduction, which occurred in parallel to nitrate reduction, was inhibited by denitrififcation due to the competition for H2. This research showed that MBfR is effective for removing nitrate from the contaminated groundwater.

关键词： hydrogen-based membrane biofilm reactor autotrophic denitrification nitrate groundwater

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

Nitrate removal by anaerobic ferrous-oxidizing(NAFO) process:performance and characteristics of cultivated sludge

Nitrate removal by anaerobic ferrous-oxidizing(NAFO) process...

引用

中国生物工程学会第六次全国会员代表大会暨第九届学术年会

作者： Meng Zhang 郑平 Zhuo Zeng Xiaoyu Shan Ghulam Abbas Department of Environmental Engineering Zhejiang University

The nitrate-dependent anaerobic ferrous oxidizing(NAFO) is a newly discovered autotrophic bioprocess,which was valuable to develop autotrophic denitrifying *** this work,the performance of NAFO process and characteristics of the active sludge was *** NAFO process was operated in the lab-scale reactor over 200 *** whole operation period could be divided into three separate *** the steady state(phase III),a nitrate removal rate(NRR) of 115.01±7.69 g·m·d was achieved.A comparison between the seeding sludge and cultivated sludge was carried out to illustrate the NAFO sludge *** results showed that the NAFO sludge possessed distinct high settleability,and the average velocity value was 390.07±161.31 m/*** increasing of particle size and density was contributed to the excellent *** NAFO sludge contained high quantity of iron oxide compounds,which endowed unique morphology characteristics of the NAFO *** a long-term operation,a microbial succession was supposed to occur in the granular sludge,and the dominant bacterial communities in the NAFO sludge were Proteobacteria,Actinobacteria,Firmicutes and Chloroflexi.

关键词： autotrophic denitrification NAFO performance physicochemical characteristics microbial community

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

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

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

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：