| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain high-quality compost within a period similar to the conventional process even by using sawdust, wood chips, etc., having high lignin content and low decomposition speed as the raw material by mixing xylanase to the raw material in a compost production process. SOLUTION: Animal excrete and food waste constituting compost raw materials are mixed with sawdust, wood chips, etc., as a water-content controlling agent to control the water content of the raw materials. The obtained raw material is mixed with xylanase and the mixture is maintained at 20-60 deg.C for >=1 day and subjected to conventional, compost-production process to produce compost. Preferably the xylanase has a lignin decomposition promoting action, an optimum temperature of 50-100 deg.C and a thermal stability to leave about >=90% of activity after the treatment at 50 deg.C for 30min and about >=50% of activity after the treatment at 60 deg.C for 30min. The process is suitably applicable to a compost raw material containing >=5wt.% of lignin and >=10wt.% of sawdust or wood chips. The raw material may be mixed with agriculture, forestry and fishery wastes such as rice straw and wheat straw, industrial waste such as corrugated board and newspaper and returned compost.</p> |
