Comprehensive Evaluation of Poly-Phosphate Release from Sewage Sludge with Thermal Treatment

Abstract:

Phosphorus is a necessary nutrient element to all lives in the world. Distribution and phosphate rock reserves in the world disclose shortage crisis of phosphorus. Thus phosphorus recovery has been a research hot spot in the world. Mr.Ohtake’ group [1] recommended a new method to recover phosphorus from sewage sludge during heating process. It seems that nearly 90% of the poly-phosphate (poly-P) and 87% of total phosphate (T-P) can be released from cultivated sludge by heating at 70 °C for 1 hour. Meanwhile, released poly-P can precipitate with Ca in neutral condition without any pH adjustment. Sewage sludge was used in this research to identify its performance during thermal treatment. With the increase of temperature and heating time, release of poly-P and T-P increased obviously. However, poly-P would be hydrolyzed when temperature was higher than 80 °C. With addition of EDTA, release of poly-P increased nearly 100%. Migration of metal cations during thermal treatment can provide indirect evidence which kinds of metal cations would make impediment on poly-P release. A novel phenomenon was observed poly-P mixed with ortho-phosphate can precipitate with NH₄⁺ and Mg²⁺ as struvite at pH 8.5.

• Periodical: Applied Mechanics and Materials (Volume 768)
• Pages: 476-483
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.768.476
• Online since: June 2015
• Authors: Ming Yang Zhang, Jian Wei Du, Takahiro Kuba, Yong Wen*
• Keywords: Metal Ions, Release, Sewage Sludge, Struvite, Thermal Treatment

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