Process for treating tanned leather wastes and apparatus therefor

Tanned leather wastes are crushed in a crusher 4, put into a pressurized heating tank 1 containing an alkaline solution having a pH of 10 to 14 to be solubilized by blowing steam to a temperature of at least 70 DEG C; the obtained slurry is fed to a neutralization and cooling tank 5 and made neutral...

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Bibliographische Detailangaben
Hauptverfasser:	MIZUSE, MORIO, NAKAYASU, TSUYOSHI, MIZUSE, TOMITSUGU, YONEDA, HIROYUKI
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR BEER BIOCHEMISTRY CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING,IMPREGNATING, FINISHING CHEMISTRY COMPOSITIONS FOR TANNING DISPOSAL OF SOLID WASTE ENZYMOLOGY FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE HIDES LEATHER METALLURGY MICROBIOLOGY MUTATION OR GENETIC ENGINEERING PELTS PERFORMING OPERATIONS RECLAMATION OF CONTAMINED SOIL SOIL SKINS SPIRITS TRANSPORTING VINEGAR WINE
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Beschreibung
Zusammenfassung:	Tanned leather wastes are crushed in a crusher 4, put into a pressurized heating tank 1 containing an alkaline solution having a pH of 10 to 14 to be solubilized by blowing steam to a temperature of at least 70 DEG C; the obtained slurry is fed to a neutralization and cooling tank 5 and made neutral or weakly alkaline therein, and then fed into a methane fermentation tank 2 and subjected to methane fermentation by anaerobic bacteria treatment at a temperature of about 50 to 60 DEG C; and the gas generated is stored in a gas holder 3 and then supplied to a gas engine for driving air compressor, a boiler or a co-generation system. Chrome hydroxide that has been precipitated in the methane fermentation tank 2 is recovered via a sludge reservoir 6, while the residue liquid is treated in an aeration tank 7.