scholarly journals Assessing impacts of sand mining on water quality in Toutsang locality and design of waste water purification system

2021 ◽  
Vol 2 ◽  
pp. 100045
Author(s):  
Ypolit Kemgang Lekomo ◽  
Clautaire Mwebi Ekengoue ◽  
Aurel Douola ◽  
Rodrigue Fotie Lele ◽  
Guedjeo Christian Suh ◽  
...  
1992 ◽  
Vol 18 (5) ◽  
pp. 576-583
Author(s):  
Yasuo Koseki ◽  
Hideaki Kurokawa ◽  
Katsuya Ebara ◽  
Hitoshi Sato ◽  
Toshihiko Kaneko ◽  
...  

2007 ◽  
Vol 27 (13-15) ◽  
pp. 3749-3752 ◽  
Author(s):  
Han-Joo Kim ◽  
Won-Keun Son ◽  
Tae-Il Kim ◽  
Kyung-Suk Kang ◽  
Tetsuya Osaka ◽  
...  

Author(s):  
Hayam S. Abdelkader ◽  
Nuha M. Alhazmi

The need for clean water is becoming urgent all over the world. The risk of microbial contamination of drinking water and its growing ability under poor nutritional conditions occur frequently and existing water management systems do not efficiently eliminate these micropollutants. The major goal of this research is to analyze and test the drinking water quality at random locations in Jeddah City and to investigate the integration of polyurethane foam coated nano-silica silver nanoparticles (NSAgNPs) into the water purification system. The study was conducted in Jeddah city at random intervals during August to December 2020. Twenty-five samples (n = 25) of drinking water (tank water) were collected from different locations in Jeddah. The water samples were found contaminated with E. coli, Klebsiella pneumoniae. and the most prevalent yeast species was Candida albicans. The multi-drug resistance isolates were positively identified by PCR amplification of 16S rDNA gene fragments. The antimicrobial activity of nano-silica silver nanoparticles (NSAgNP) was analyzed and their optimal concentrations that remove potentially harmful microbes were determined. The cytotoxicity of NSAgNPs by Sulforhodamine B colorimetric (SRB) assay against breast adenocarcinoma cell line (MCF-7) showed no cytotoxic effect at concentrations ≤100 µg/mL. The 50% growth inhibition concentration (IC 50) of NSAgNPs after 72 h was 35.8 µg/mL. The excellent performance of NSAgNPs can be attributed to the capping surface functional groups and smaller particle size 8.931 nm, as verified by TEM. In conclusion, the purified water obtained by using 100 mg/L NSAgNPs is free from microbial contaminants and completely safe to drink. We recommend the integration of biosynthesized foam coated silver nanoparticles with water purification system to achieve the desired final water quality.


2021 ◽  
Vol 43 ◽  
pp. 102203
Author(s):  
Paulo Marcos Faria Maciel ◽  
Natália de Melo Nasser Fava ◽  
Antônio Wagner Lamon ◽  
Pilar Fernandez-Ibañez ◽  
John Anthony Byrne ◽  
...  

Author(s):  
Ю.А. Ремизова ◽  
А.П. Голованова ◽  
Д.А. Рудакова ◽  
А.Г. Митилинеос

Для удаления остаточных количеств фармацевтических соединений, присутствующих в питьевой воде, на всех этапах водоподготовки могут применяться разнообразные способы очистки, основанные на различных физико-химических принципах. В работе приведены результаты экспериментального исследования эффективности удаления с помощью бытовой стационарной системы водоочистки остаточных количеств фармацевтических препаратов – антибиотика левомицетина (хлорамфеникола) и стероидного гормона эстрона – из модельного раствора, приготовленного на основе водопроводной воды с добавлением лекарственных препаратов. Показано, что бытовая система водоочистки обладает способностью существенно снижать остаточные концентрации фармацевтических препаратов левомицетина и эстрона на всем протяжении заявленного производителем ресурса. В секторе бытовой водоочистки установки адсорбционного типа по-прежнему остаются наиболее востребованным типом водоочистных систем, обеспечивающих высокую эффективность удаления различных загрязнителей при минимальных капитальных затратах. To remove residual amounts of pharmaceutical compounds present in drinking water, a variety of purification methods based on various physicochemical principles can be used at all stages of water treatment. The paper presents the results of an experimental study of the efficiency of removing residual concentrations of pharmaceuticals – laevomycetin antibiotic (chloramphenicol) and estrone steroid hormone – from a model solution prepared on the basis of tap water with the addition of drugs, using a home fixed water purification system. It is shown that the home water purification system provides for the significant reduction of residual concentrations of chloramphenicol and estrone throughout the service life declared by the manufacturer. In the household water purification sector, adsorption-type units are still the most in-demand type of water purification systems that provide for the high efficiency in removing various pollutants with minimal capital costs.


2011 ◽  
Vol 31 (16) ◽  
pp. 3354-3357 ◽  
Author(s):  
Lorena Aires Lombardi Queiroz ◽  
Mariana de Oliveira Carvalho ◽  
João Borges Laurindo ◽  
Vivaldo Silveira Júnior

1994 ◽  
Vol 20 (3) ◽  
pp. 360-366
Author(s):  
Yasuo Koseki ◽  
Nobuko Hashimoto ◽  
Kazuhiko Takino ◽  
Toshihiko Kaneko ◽  
Syunji Honma

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