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Use of calcium-based materials for phosphorus removal from greenhouse wastewater

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dc.contributor.advisor Zheng, Youbin
dc.contributor.advisor Dixon, Mike Dunets, Siobhan 2014-09-10T19:14:35Z 2014-09-10T19:14:35Z 2014-09 2014-09-08 2014-09-10
dc.description.abstract Phosphorus (P) contamination in wastewater is a major topic of discussion in the North American greenhouse industry. This study evaluated chemical treatment methods including precipitation of P as calcium phosphate and P-sorbing material filters for removing high, variable P concentrations, and provided treatment recommendations specific to greenhouse wastewater treatment. Precipitation via lime addition achieved 99% P removal at a lime : P ratio of 1.5 and a pH of 8.6-9.0. Efficiency of separation of the precipitate was improved via flocculation using guar gum or cationic starch. Material columns incorporating steel slag or concrete waste removed >99% over repeated applications, and demonstrated high phosphate retention. Both methods also removed some micronutrient contaminants, and recovered P and other nutrients in forms that could be re-used as a nutrient source for plants. Overall, this research demonstrated that these treatment methods are worthy of further research on application to a full-sized system. en_US
dc.description.sponsorship NSERC (Canada Graduate Scholarship- Master's Program); Ontario Student Assistance Program (Ontario Graduate Scholarship); University of Guelph en_US
dc.language.iso en en_US
dc.subject phosphorus en_US
dc.subject wastewater treatment en_US
dc.subject greenhouse wastewater en_US
dc.subject calcium phosphate en_US
dc.subject horticulture en_US
dc.subject precipitation en_US
dc.subject phosphate en_US
dc.title Use of calcium-based materials for phosphorus removal from greenhouse wastewater en_US
dc.type Thesis en_US Environmental Sciences en_US Master of Science en_US School of Environmental Sciences en_US
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