June 23, 2021 Thesis Open Access

Abdela Kedir

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{
  "@context": "https://schema.org/", 
  "@id": "https://doi.org/10.20372/nadre/20964", 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "affiliation": "Addis Ababa Science & Technology University", 
      "name": "Abdela Kedir"
    }
  ], 
  "datePublished": "2021-06-23", 
  "description": "<p>Point-of-use water treatment produces clean drinking water by eliminating pathogenic<br>\nmicrobial pollutants through filtration and/or chemical disinfection. Antimicrobial<br>\nnanotechnology, e.g., silver nanoparticles are commonly used as the sole disinfectant agent in<br>\nPoint-of-use water (POU) water treatment along with different supporting materials. Hence,<br>\nthe inactivation of E. coli using a gravity-driven fixed bed packed with silver nanoparticles<br>\ncoated ceramic bed was studied. Silver nanoparticles (Ag-NPs) were prepared by<br>\nphotochemical reduction of silver nitrate with sodium citrate as a reducing agent and<br>\ncharacterized using different techniques such as UV-vis spectroscopy, scanning electron<br>\nmicroscopy (SEM), x-ray diffraction (XRD), atomic absorption spectroscopy (AAS) and<br>\nparticle size analysis (PSA). Silver nanoparticles were then successfully coated on the surface<br>\nof ceramic materials. Furthermore, antibacterial activities of silver nanoparticles coated<br>\nceramic material were performed using zone of inhibition and shake flask test methods against<br>\ngram-negative (E. coli, S. typhi) and gram-positive (S. aureus, B. subtilis) bacteria. The result<br>\nrevealed that the material has good antibacterial performance and can be used as supporting<br>\nmaterial for water disinfection in fixed bed column. In this study, the effects of different<br>\nparameters such as initial bacteria concentration (102-1010cfu/ml), initial silver nanoparticles<br>\nconcentration (100-500mg/L), and bed mass (15-75g) on bacteria removal efficiency of a<br>\npacked bed column made with ceramic bed were investigated. Response surface methodology<br>\n(RSM-BBD) experimental design was applied to investigate and find optimum fixed bed<br>\ncolumn parameters. A total of 15 tests were conducted, and the important parameters which<br>\naffect the selected responses (bacteria removal efficiency) were investigated. The model<br>\nadequacy test and regression analysis have shown that the results were well fitted with<br>\nquadratic model equations. Model predictions were in good agreement with experimental data<br>\nwith 96.96 % of variability. Bacteria removal efficiency of 95%, initial silver nanoparticles<br>\nconcentration of 297.3mg/L and bed mass of 44.3g was found to be the optimum condition<br>\nfor water disinfection in fixed bed column packed with silver nanoparticles coated ceramic<br>\nbed.</p>", 
  "headline": "water disinfection using a gravity-driven fixed bed packed with silver nanoparticles coated ceramic", 
  "identifier": "https://doi.org/10.20372/nadre/20964", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "inLanguage": {
    "@type": "Language", 
    "alternateName": "eng", 
    "name": "English"
  }, 
  "keywords": [
    "Silver nanoparticle, Ceramic bed, Point of use, Fixed bed, Water disinfection."
  ], 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "water disinfection using a gravity-driven fixed bed packed with silver nanoparticles coated ceramic", 
  "url": "https://nadre.ethernet.edu.et/record/20964"
}