Phosphorus Recovery from Sewage Sludge Ash: A Case Study in Gifu, Japan
The full-scale plant for recovering P from sewage sludge ash (SSA) started operation at a wastewater treatment plant in Gifu City, Japan, in April 2010. P is released from SSA using the alkaline (NaOH) leaching technology and recovered as calcium hydroxyapatite (HAP). The full-scale plant recovers approximately 30–40% Pi from SSA and supplies about 300 t/year of by-product Pi fertilizer, named Gifu-no-daichiⓇ, mainly to local farmers. The Pi fertilizer, Gifu-no-daichiⓇ, is sold through the JA-Zen-Noh (National Federation of Agricultural Cooperative Associations) in Gifu City with a favorable reputation from farmers. Gifu City has been increasing the volume of the fertilizer sales year by year and considers it is critical to make the P recovery process more efficient and stable.
KeywordsSewage sludge ash Calcium phosphate Phosphate fertilizer
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