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.

磷可以以可出售的肥料形式从废水中回收。这对于市政设施而言可能是有利可图的，它可以减轻城市河流的富营养化，并简化进一步抛光废水以生产再生水的过程。在这项工作中，评估了在大都市地区的处理厂中回收磷的可行性。提出了通过在反应器（流化床或搅拌）中添加镁来由污泥液生产鸟粪石颗粒的方法。以前，厌氧池会刺激微生物的作用，在消化之前从污泥中释放磷。在圣保罗大都市区的五个最大的处理设施中采用这种工艺，将回收5.3吨/天的磷，每天可生产38.0吨的鸟粪石颗粒。进行了初步的可行性评估，同时考虑了运营费用和潜在收入。结果表明该养分回收计划在特定地区的经济可行性。