| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a membrane separation methane fermentation process which can prevent precipitation of calcium carbonate in a methane fermentation tank and can prevent clogging with calcium scales. <P>SOLUTION: When a high concentration organic waste water 11 is subjected to methane fermentation treatment in the methane fermentation tank 12, a concentration regulating liquid is supplied to the methane fermentation tank 12 to regulate calcium ion concentration and pH in the system to suppress precipitation of calcium carbonate. On the other hand, membrane separation of sludge digested in the methane fermentation tank 12 is carried out and membrane-passing liquid is taken out as methane fermentation treatment liquid. <P>COPYRIGHT: (C)2004,JPO |
