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" Phosphorus Recovery from Iron Phosphate in Anaerobic Biosolids from the Ottawa Municipal Wastewater Treatment Plant "
Bluteau, Sarah
Omelon, Sidney
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1112135
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| Doc. No
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TLpq2519036618
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| Main Entry
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Bluteau, Sarah
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Omelon, Sidney
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| Title & Author
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Phosphorus Recovery from Iron Phosphate in Anaerobic Biosolids from the Ottawa Municipal Wastewater Treatment Plant\ Bluteau, SarahOmelon, Sidney
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| College
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McGill University (Canada)
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| Date
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2019
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| student score
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2019
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| Degree
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M.E.
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| Page No
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147
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| Abstract
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Phosphorus fertilizers are required to maintain and enhance agricultural productivity. Natural fertilizers such as manure and guano have been used since the Neolithic period to enrich soils. Since World War II, industrial-scale production of chemical fertilizers has provided powerful supplements to nutrient-deficient soils to increase agricultural yields. The principal mineral fertilizers are nitrogen (N), phosphorus (P), and potassium (K). The sole source of phosphorus for fertilizers is phosphorite ore, also known as “phosphate rock”. The phosphate content in phosphorite is in the form of an apatite mineral. Phosphorite deposits are geopolitically concentrated in a few locations, such as Morocco, Western Sahara, China, Russia, and the United States of America. Similar to oil, the phosphate rock consumption rate is orders of magnitude more rapid than the geological time required for its production, making it is a finite and non-renewable resource. This thesis examines the potential for upgrading the mineral form of phosphate in biosolids produced by the Ottawa municipal wastewater treatment plant (Robert O. Pickard Environmental Centre: ROPEC). The overall goal of this project is to transform two ROPEC waste streams into a profitable nutrient commodity. The first waste stream is biosolids, and the second is carbon dioxide produced by anaerobic digestion at ROPEC. Anaerobic biosolids contain iron and aluminum phosphate, with low phosphorus nutrient value. Dissolving iron phosphate within a mixture of 10 % biosolids by adding sodium sulfides nonahydrate increased the inorganic ortho-phosphate concentration from near 0 to 45 mM. A calcium-bicarbonate solution was prepared by mixing 100 % CO2 in a slurry of limestone fines and potable water; the CO2 increased the dissolved calcium from 0.5 mM to approximately 5 mM. The calcium-carbonate-rich solution was mixed with the phosphate-rich biosolids slurry in a 75:25 volumetric ratio at ambient temperature. An apatite-like mineral precipitated from this mixture. Preliminary results obtained through semi-continuous processes, at lab-scale, showed an increase in the phosphorus nutrient value of the biosolids. The Mehlich-3 leach test for soils showed a 1,500 % increase in phosphate nutrient value from the original biosolids. My research demonstrates the potential for upcycling phosphate in municipal wastewater treatment plant anaerobic biosolids to a higher phosphorus nutrient value
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| Subject
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Potassium
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Reagents
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Sodium
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Sulfuric acid
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