| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for treating a digested waste liquid, which is constituted so as to solve the following problems: an unreacted flocculant and a floating substance in a chemicals-injected dehydrated filtrate are re-flocculated in the diffusion column of an ammonia stripping device by the heat of steam when the chemicals-injected dehydrated filtrate, which is obtained by adding the flocculant to a digested waste liquid to dehydrate the waste liquid, is treated by the ammonia stripping device in the treatment method for the digested waste liquid after methane fermentation and continuous operation becomes difficult by a rise in internal pressure as the result of blocking due to a sediment and prevents the re-flocculation of the unreacted flocculant and the floating substance. <P>SOLUTION: In the method for treating the digested waste liquid, the chemicals-injected dehydrated filtrate is charged in the ammonia stripping device after heat-treated to reduce the unreacted flocculant and the floating substance. In the heat treatment, the high-temperature digested waste liquid after methane fermentation is used as a heat source and the heat exchange with the chemicals-injected dehydrated filtrate can be used. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
