Assessment of the use of dolomite for the recovery of ammonia from field landfill leachate. (c2019)

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dc.contributor.author Rayshouni, Hussein
dc.date.accessioned 2019-11-06T12:35:30Z
dc.date.available 2019-11-06T12:35:30Z
dc.date.copyright 2019 en_US
dc.date.issued 2019-11-06
dc.date.submitted 2019-07-18
dc.identifier.uri http://hdl.handle.net/10725/11497
dc.description.abstract Municipal landfill leachates contain significant amounts of ammonia, which is toxic at high concentrations. It is also reported to inhibit the activity of microorganisms responsible for the biological treatment of the leachate. Ammonia could be removed from solution through struvite (magnesium ammonium phosphate hexahydrate) precipitation in the presence of magnesium and phosphate sources, which could then be used as fertilizer. This study assessed the use of dolomite (calcium magnesium carbonate) and hydroxyapatite (obtained from cow bone), as abundant and low-cost magnesium and phosphate sources for struvite precipitation. Batch experiment tests were conducted to investigate the effects of pH and (Mg2+:NH4+:PO43-) molar ratios on the removal efficiency of ammonia. X-ray Powder Diffraction (XRPD) was used to identify the solid phases in the residues. Using dissolved dolomite along with Na3PO4·12H2O as a phosphate source at a molar ratio of 1.25:1.0:1.25 (Mg2+:NH4+:PO43-) and a pH of 9.5 resulted in an ammonia removal efficiency of 90%. However, using dolomite calcined at 950 °C with the same phosphate source showed a significant decrease in removal efficiency to 44%, while using dolomite calcined at 750 °C (under continuous CO2 injection) resulted in a removal efficiency of 37%. In parallel experiments, hydroxyapatite obtained from cow bone was dissolved and used as the phosphate source in combination with dissolved dolomite as the magnesium source; this resulted in an ammonia removal efficiency of 94%. However, when the dissolved hydroxyapatite was used with solid dolomite, the removal efficiency dropped to 60% for dolomite calcined at 950 °C and 46% for dolomite calcined at 750 °C. en_US
dc.language.iso en en_US
dc.subject Dissertations, Academic en_US
dc.subject Lebanese American University -- Dissertations en_US
dc.subject Lebanese American University -- Dissertations en_US
dc.subject Hazardous waste sites -- Leaching en_US
dc.subject Leachate en_US
dc.subject Sanitary landfills -- Leaching en_US
dc.title Assessment of the use of dolomite for the recovery of ammonia from field landfill leachate. (c2019) en_US
dc.type Thesis en_US
dc.term.submitted Summer en_US
dc.author.degree MS in Civil And Environmental Engineering en_US
dc.author.school SOE en_US
dc.author.idnumber 201302223 en_US
dc.author.commembers Abi shdid, Caesar en_US
dc.author.commembers Chatila, Jean en_US
dc.author.department Civil Engineering en_US
dc.description.embargo N/A en_US
dc.description.physdesc 1 hard copy: x, 72 leaves; col. ill.; 31 cm. available at RNL. en_US
dc.author.advisor Wazne, Mahmoud en_US
dc.keywords Landfill leachate en_US
dc.keywords Ammonia en_US
dc.keywords Struvite en_US
dc.keywords Magnesium source en_US
dc.keywords Dolomite en_US
dc.description.bibliographiccitations Includes bibliographical references (leaves 54-70). en_US
dc.identifier.doi https://doi.org/10.26756/th.2019.132 en_US
dc.author.email hussein.rayshouni@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/thesis.php en_US
dc.publisher.institution Lebanese American University en_US
dc.author.affiliation Lebanese American University en_US

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