Title:
RE-TREATMENT OF USED DIATOMACEOUS EARTH AS FILTER MEANS
Document Type and Number:
Japanese Patent JPS6365950
Kind Code:
A
Abstract:
Spent kieselguhr used as a filter medium, preferably in breweries, is regenerated by adding 2 to 8% sodium hydroxide solution at a reaction temperature of about 60 to 90 DEG C and subjecting it to gentle stirring for a reaction time from 30 to 120 minutes. The concentration of the sodium hydroxide solution is then 4 to 5% and the reaction temperature 80 to 90 DEG C. The spent kieselguhr is discharged into a heatable vessel. After the end of the reaction time, the sodium hydroxide solution is removed and the kieselguhr is washed clear by means of a vacuum filter or pressurised belt filter in a plurality of extraction stages. For complete removal of the alkali, sulphuric acid or hydrochloric acid in a concentration of up to 0.1% is added to the washing water in the last extraction stage.
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Inventors:
GERUTO ZOOMERU
Application Number:
JP16993087A
Publication Date:
March 24, 1988
Filing Date:
July 09, 1987
Export Citation:
Assignee:
HENNINGAA BUROI AG
International Classes:
B01D41/02; B01J20/14; B01J20/34; (IPC1-7): B01D41/02; B01J20/34
Attorney, Agent or Firm:
Nobuyuki Fukuda
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