Method for sanitizing waste
AssigneeRenescience A/S
InventorsHanne Risbjerg SØRENSEN, Steen Gustav STAHLHUT
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Abstract
The present invention relates to a method for sanitizing waste, where waste having specific bacterial counts are subjected to an enzyme composition at a pH between 30 and 6.0 and at a temperature of between 40° C. and 60° C., the liquid is separated and the waste is subjected to the enzyme composition for a period of 10 to 30 hours to obtain at least partial reduction in bacterial count.
Claims15
Method for sanitizing waste, the method comprising:
- a) Subjecting waste comprising biodegradable material and non-biodegradable material and having a total bacterial count of at least 2.5×108 CFU/gram waste, a bacterial count of E. coli of at least 1.5×106 CFU/gram waste or a bacterial count of Enterobacteriaceae of at least 1.5×108 CFU/gram waste, to enzymatic and/or microbial treatment in a bioreactor at a pH between 3.0 and 6.0 and at a temperature of between 40° C. and 60° C. for a period of 10 to 30 hours to obtain at least partial reduction in bacterial count.
Method according to any of the preceding claims, wherein the waste has a dry-matter content in in the range of 50-70% wt.
Method according to any of the preceding claims, wherein the waste under step a) is subjected to water to reduce the dry matter content of the waste.
Method according to any of the preceding claims, wherein the waste is subjected to enzymatic and/or microbial treatment in a bioreactor for a period of about 20-25 hours, preferably about 18 hours.
Method according to any of the preceding claims, wherein the pH in step a) is below 6.0, preferably below 5.0, more preferably below 4.5, even more preferably below 4.4 and most preferably below 4.2.
Method according to any of the preceding claims, wherein the temperature in step a) is 55° C. or below, the temperature is 50° C. or below or the temperature is 45° C. or below.
Method according to any of the preceding claims, wherein the waste is subjected to enzymatic and/or microbial treatment in a bioreactor in step a) for 24 hours and the pH is 4-6 and the temperature is in the range of 40-60° C.
Dependencies are inferred from the claim text.