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Phosphorus Recovery from Charcoal of Sewage Sludge by Incineration Treatment



Author(s)

Masaaki Takahashi¹, Yukimasa Takemoto¹, Eiji Yuuki² and Koichi Seno²

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DOI:10.17265/2161-6213/2018.3-4.003

1. Yokkaichi University, Research Laboratory on Environmental Technology, Kayo-cho 1200, Yokkaichi, Mie 512- 8512, Japan
2. Mie Chuo Kaihatsu Co., Ltd, Hachiya4713, Yono, Iga, Mie 518-1152, Japan

The phosphorus recovery from charcoal of sewage sludge by an incineration method was investigated. The charcoal of sewage sludge was mixed with alkali metal hydroxide and incinerated at 750 °C in aerobic conditions. The phosphorus was successfully recovered as an alkali metal phosphate from the incinerated ash through water extraction. The recovery rate of the phosphorus reached about 75% to 80%. The appropriate condition of the phosphorus recovery and composition of the recovered phosphorus were investigated.

Sewage sludge, sodium hydroxide, potassium hydroxide, phosphorus recovery.