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1. (WO2018100847) METHOD OF RECOVERING URINE-DERIVED NUTRIENT SALTS FROM USED DIAPERS AND THE LIKE

Pub. No.:    WO/2018/100847    International Application No.:    PCT/JP2017/033596
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Sat Sep 16 01:59:59 CEST 2017
IPC: B29B 17/00
B09B 3/00
B09B 5/00
C01B 25/32
Applicants: UNICHARM CORPORATION
ユニ・チャーム株式会社
Inventors: KONISHI, Takayoshi
小西 孝義
YAMAKI, Koichi
八巻 孝一
ITO, Ryusei
伊藤 竜生
FUNAMIZU, Naoyuki
船水 尚行
TSUBOUCHI, Kizuku
坪内 築
Title: METHOD OF RECOVERING URINE-DERIVED NUTRIENT SALTS FROM USED DIAPERS AND THE LIKE
Abstract:
Provided is a method of recovering urine-derived nutrient salts from used diapers, incontinence pads, and the like. The method according to the present application is for recovering urine-derived nutrient salts from a used absorbent article containing urine, the method comprising: a deactivation step for immersing the used absorbent article in an aqueous solution containing a calcium compound to deactivate a superabsorbent polymer; a separation step for using a sieve to separate a solid-liquid mixture yielded by the deactivation step into a first fraction containing the constituent materials of the absorbent article, and a second fraction containing an aqueous solution containing the calcium compound and nutrient salts, and nutrient-salt-containing sediment that has passed through the sieve; a sedimentation step for producing nutrient-salt-containing sediment using a HAP method; and a concentration step for adjusting the pH of the aqueous solution in contact with the nutrient-salt-containing sediment to within a range of 5.6–7.0, dissolving at least some of a calcium compound other than hydroxyapatite in the sediment, and increasing the hydroxyapatite content of the sediment.