Title:
METHOD OF RECOVERING URINE-DERIVED NUTRIENT SALTS FROM USED DIAPERS AND THE LIKE
Document Type and Number:
WIPO Patent Application WO/2018/100847
Kind Code:
A1
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.
Inventors:
KONISHI TAKAYOSHI (JP)
YAMAKI KOICHI (JP)
ITO RYUSEI (JP)
FUNAMIZU NAOYUKI (JP)
TSUBOUCHI KIZUKU (JP)
YAMAKI KOICHI (JP)
ITO RYUSEI (JP)
FUNAMIZU NAOYUKI (JP)
TSUBOUCHI KIZUKU (JP)
Application Number:
PCT/JP2017/033596
Publication Date:
June 07, 2018
Filing Date:
September 15, 2017
Export Citation:
Assignee:
UNICHARM CORP (JP)
International Classes:
B29B17/00; B09B3/00; B09B5/00; C01B25/32
Foreign References:
| JP2015182246A | 2015-10-22 | |||
| JP2015182246A | 2015-10-22 |
Other References:
See also references of EP 3549739A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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