Abstract
The alkaline technology has been applied to phosphate (P i ) recovery from sewage sludge ash (SSA) at wastewater treatment plants (WWTP). P i is extracted from mono-incinerated sewage sludge with NaOH and recovered from the leachate using chemical precipitation with Ca(OH)2. Approximately 30-40% of P i could be recovered from SSA as calcium P i while minimizing the leaching of toxic heavy metals at high pH. The recovered P product can be recycled as a fertilizing material for agriculture.
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Sonoda, K. ichi. (2018). Alkaline leaching of phosphate from sewage sludge ash. In Phosphorus Recovery and Recycling (pp. 143–148). Springer Singapore. https://doi.org/10.1007/978-981-10-8031-9_8
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