Thesis Open Access

water disinfection using a gravity-driven fixed bed packed with silver nanoparticles coated ceramic

Abdela Kedir

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    <subfield code="a">eng</subfield>
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    <subfield code="a">Silver nanoparticle, Ceramic bed, Point of use, Fixed bed, Water disinfection.</subfield>
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    <subfield code="c">Addis Ababa Science &amp; Technology University</subfield>
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    <subfield code="a">&lt;p&gt;Point-of-use water treatment produces clean drinking water by eliminating pathogenic&lt;br&gt;
microbial pollutants through filtration and/or chemical disinfection. Antimicrobial&lt;br&gt;
nanotechnology, e.g., silver nanoparticles are commonly used as the sole disinfectant agent in&lt;br&gt;
Point-of-use water (POU) water treatment along with different supporting materials. Hence,&lt;br&gt;
the inactivation of E. coli using a gravity-driven fixed bed packed with silver nanoparticles&lt;br&gt;
coated ceramic bed was studied. Silver nanoparticles (Ag-NPs) were prepared by&lt;br&gt;
photochemical reduction of silver nitrate with sodium citrate as a reducing agent and&lt;br&gt;
characterized using different techniques such as UV-vis spectroscopy, scanning electron&lt;br&gt;
microscopy (SEM), x-ray diffraction (XRD), atomic absorption spectroscopy (AAS) and&lt;br&gt;
particle size analysis (PSA). Silver nanoparticles were then successfully coated on the surface&lt;br&gt;
of ceramic materials. Furthermore, antibacterial activities of silver nanoparticles coated&lt;br&gt;
ceramic material were performed using zone of inhibition and shake flask test methods against&lt;br&gt;
gram-negative (E. coli, S. typhi) and gram-positive (S. aureus, B. subtilis) bacteria. The result&lt;br&gt;
revealed that the material has good antibacterial performance and can be used as supporting&lt;br&gt;
material for water disinfection in fixed bed column. In this study, the effects of different&lt;br&gt;
parameters such as initial bacteria concentration (102-1010cfu/ml), initial silver nanoparticles&lt;br&gt;
concentration (100-500mg/L), and bed mass (15-75g) on bacteria removal efficiency of a&lt;br&gt;
packed bed column made with ceramic bed were investigated. Response surface methodology&lt;br&gt;
(RSM-BBD) experimental design was applied to investigate and find optimum fixed bed&lt;br&gt;
column parameters. A total of 15 tests were conducted, and the important parameters which&lt;br&gt;
affect the selected responses (bacteria removal efficiency) were investigated. The model&lt;br&gt;
adequacy test and regression analysis have shown that the results were well fitted with&lt;br&gt;
quadratic model equations. Model predictions were in good agreement with experimental data&lt;br&gt;
with 96.96 % of variability. Bacteria removal efficiency of 95%, initial silver nanoparticles&lt;br&gt;
concentration of 297.3mg/L and bed mass of 44.3g was found to be the optimum condition&lt;br&gt;
for water disinfection in fixed bed column packed with silver nanoparticles coated ceramic&lt;br&gt;
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    <subfield code="a">Srinivasan N R ( PhD )</subfield>
    <subfield code="u">Addis Ababa Science &amp; Technology University</subfield>
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    <subfield code="a">Abdela Kedir</subfield>
    <subfield code="u">Addis Ababa Science &amp; Technology University</subfield>
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    <subfield code="c">2021-06-23</subfield>
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