检索结果-南通市图书馆

A Moringa Oleifera Disinfectant-sand filter Integration： A Review of an Alternative Sustainable Technology for Household Water Treatment

引用

Journal of Environmental Science and Engineering 2011年第9期5卷 1100-1108页

作者： K.A. Yongabi D.M. Lewis P.L. Harris Department of Chemical Engineering The University of Adelaide Adelaide 5005 South Australia Department of Agriculture and Wine Science The University of Adelaide Adelaide 5005 South Australia

This review provides an insight and up-to-date information on the application of Moringa oleifera seeds, the short falls of existing technologies as a coagulant and disinfectant in domestic water treatment. While the coagulant properties are well reported, the disinfectant properties are not well studied. Literatures on low cost alternative technologies such as the application of hiocoagulants and slow sand filters are extensively reported. However, there is limited work addressing the limitations of these technologies that have restricted its widespread use to solve the global soaring water crises. Slow sand filters have a very slow filtration rate that depends on the biofilm layer which takes about 17 days to form. Moringa oleifera treated water cannot last more than 48 hours without bacteria regrowth. Investigation of the best method of isolating coagulant component continues with differing opinions over the nature of its coagulant ingredient not resolved in ongoing literature. An attempt was made in this paper to highlight the advantages of a Moringa disinfectant sand filter hybrid system that can purify water. Microbiological advantages of this system in providing a 100% removal of pathogens, and engineering considerations such as water treatment within an hour residence time, faster flow rates, less clogging and backwashing could be some of the advantages ofa Moringa sand filter system. The need to focus on integrating Moringa and sand filter systems for more practical applications is recommended.

关键词： Moringa oleifera disinfectant sand filter water integration review

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

Impacts of backwashing on micropollutant removal and associated microbial assembly processes in sand filters

引用

Frontiers of Environmental Science & Engineering 2023年第3期17卷 87-92页

作者： Donglin Wang Jie Zhou Hui Lin Junwen Chen Jing Qi Yaohui Bai Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

Backwashing is crucial for preventing clogging of sand ***,few studies have investigated the effect of backwashing on micropollutant removal and the dynamic changes in the microbial community in sand ***,we used a series of manganese and quartz sand filters under empty bed contact times(EBCTs)of 2 h and 4 h to explore variations in micropollutant degradation and temporal dynamics of the microbial community after *** results showed that the removal efficiencies of caffeine,sulfamethoxazole,sulfadiazine,trimethoprim,atrazine,and active biomass recovered within 2 d after backwashing in both types of sand filters at 2-h EBCT,but the recovery of sulfadiazine and trimethoprim was not observed at 4-h ***,the removal efficiency of atenolol increased after backwashing in the manganese sand filters,whereas maintained almost complete removal efficiency in the quartz sand filters at both *** correlation analysis indicated that microbial community composition gradually recovered to the pre-backwashing level(R increased from 0.53 to 0.97)at 2-h EBCT,but shifted at 4-h EBCT(Rsand filters,*** contrast,at 4-h EBCT,the recovered microbes dropped to 15.55%–25.69%in both types of sand filters.

关键词： sand filter Backwashing Recovery Micropollutants Community composition

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

Role of sand size on bacterial retention in biochar-amended sand filters

引用

Biochar 2019年第4期1卷 353-363页

作者： Carl H.Bolster USDA-ARS 2413 Nashville Rd.B-5Bowling GreenKY 42101USA

The addition of biochar to sand columns can enhance the retention of bacteria and thus may provide a management strategy for removing bacteria from tile-drainage *** this study,the role of sand size as a factor in controlling microbial reten-tion in biochar-amended sand columns was *** column experiments were conducted to quantify the removal of two bacterial isolates(*** and Salmonella)and polystyrene microspheres in 10-cm-long columns packed with clean sand of three different sizes(0.25,0.71,and 1.19 mm)at four biochar concentrations(0%,5%,10%,and 15%).Sorption studies were also performed to help identify the relative roles of sorption and physical straining on the removal of bacteria and microspheres within the *** the large sand,the log10 removal values(LRV)for *** increased from 0.22 to 0.49 for the 0%and 15%biochar concentrations,respectively,while LRV for Salmonella increased from 0.19 to *** the small sand,increasing biochar concentration from 0%to 15%increased LRV from 0.11 to 1.9 for *** and from 0.20 to 4.6 for *** comparison,LRV for microspheres in the 15%biochar columns was only minimally higher than the unamended columns for all three sand *** from the sorption studies show that high sorption coefficients generally correlated with high LRV indicating that sorption rather than physical straining was the primary mechanism of retention in the *** from this study further our understanding of bacterial retention in biochar-amended porous media.

关键词： Biochar E.coli Salmonella sand filter

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

Comparing unamended and Fe-coated biochar on removal efficiency of bacteria,microspheres,and dissolved phosphorus in sand filters

引用

Biochar 2021年第3期3卷 329-338页

作者： Carl H.Bolster USDA-ARS 2413 Nashville Rd.B-5Bowling GreenKY 42101USA

The effects of uncoated and Fe-coated biochars(BC)on the removal of bacteria,microspheres,and dissolved reactive phosphorus(DRP)in sand filters were *** were packed with 1.2 or 2.0-mm sand mixed with 30%(vol/vol)uncoated BC,Fe-coated BC,or a control without *** of ***,Salmonella,and Enterococci increased from 23,42,and 25%in the unamended 1.2-mm sand to 48,80,and 75%in the uncoated BC treatment,though only the increase for Enterococci was significant(psand but only the removal of *** was significantly greater than the uncoated BC sand *** the 2.0-mm sands,the only significant increase in removal following BC addition was observed for *** in microsphere removal were generally consistent with *** of DRP in the unamended and uncoated BC filters was 33 and 13%(p>0.05),respectively,whereas removal in the Fe-coated BC filters was 98%(psands were similar(p>0.05)with DRP sorption to the Fe-coated BC-amended sand being significantly greater(psand filters.

关键词： Biochar E.coli Enterococci Microsphere Phosphorus Salmonella sand filter

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

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

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：