EM - Escola de Minas

URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/6

Notícias

A Escola de Minas de Ouro Preto foi fundada pelo cientista Claude Henri Gorceix e inaugurada em 12 de outubro de 1876.

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Filtros

2020 - 20212

Configurações

Autor: search.filters.author.Sánchez, Antonio SantosAssunto: search.filters.subject.Struvite fertilizer

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
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    Nutrient recovery in wastewater treatment plants: comparative assessment of different technological options for the metropolitan region of Buenos Aires.
    (2021) Sánchez, Antonio Santos; Martins, Gesaína
    In the metropolitan region of Buenos Aires, the load of nutrients discharged to urban rivers and shores is producing a severe eutrophication problem in the estuary of La Plata River. That problem could be alleviated by recovering nitrogen (N) and phosphorus (P) through the production of fertilizer products in the existing activated sludge treatment plants. Four nutrient recovery options were considered: struvite precipitation in the centrate line; acidic leaching of the sludge followed by struvite precipitation of the centrate; Ion Exchange in the centrate line; and a combination of struvite precipitation in the centrate line plus an Ion Exchange unit to further polish the secondary effluent. Those options were compared with basis on their economic sustainability and their capacity to reduce the load of N and P discharged to the coastal waters and rivers. The economic assessment indicated that producing fertilizer products in the existing facilities, using the four considered options, would be unprofitable. In the best case, which is struvite precipitation in the centrate line, the potential revenues would only cover 38.5 % of the operational expenses. Environmental benefits could justify that cost, as in some urban rivers the load of P could be reduced by 42.5 % by struvite precipitation. Regarding the load of nutrients that is discharged to the estuary, the impact of the considered nutrient recovery options ranges from a decrease in 0.5 % N and 3.7 % P (struvite precipitation) to a decrease in 8.2 % N and 4.4 % P (combination of struvite precipitation + Ion Exchange).
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    Technical and economic feasibility of phosphorus recovery from wastewater in São Paulo’s Metropolitan Region.
    (2020) Sánchez, Antonio Santos
    Phosphorus can be recovered from wastewater in the form of marketable fertilizers. That can be profitable for municipal facilities, alleviate the eutrophication of urban rivers, and ease further polishing the effluent to produce reclaimed water. In this work, it is assessed the viability of recovering phosphorous in the treatment plants of a large metropolitan region. It is proposed the production of struvite granules from sludge liquors by adding magnesium in a reactor (fluidified bed or stirred). Previously, an anaerobic tank would stimulate the action of microorganisms to release phosphorus from the sludge before its digestion. Applying such process in the five largest treatment facilities of the Metropolitan Region of São Paulo would recover 5.3 tons/day of phosphorous and yield 38.0 tons/day of struvite granules. A preliminary viability assessment was conducted, considering operational expenses and potential revenues. Results indicate the economic viability of this nutrient recovery scheme in this particular region.