| 摘要 |
<P>PROBLEM TO BE SOLVED: To maintain the quality of water in a reaction tank for UASB processing to keep the water in a condition where the reactivity of microorganisms is enhanced. <P>SOLUTION: A waste water processor 1 includes a reaction tank 10 which supplies to-be-processed water from a bottom 100 to cause a microbial mass to come in contact with the to-be-processed water and then discharges it from the upper part of the reaction tank 10 as processed water, and a pH adjusting tank 18 which adjusts the pH of part of processed water flowing out of the reaction tank 10. The pH adjusting tank 18 is connected to the side face of the reaction tank 10 via a return pipe 181b or return pipe 181c. Part of processed water discharged out of the reaction tank 10 is adjusted in pH so that the pH of the processed water stays within a pH range in which the reactivity of the microbial mass is enhanced. The processed water with an adjusted pH is injected into a bed 19 in the reaction tank 10, which bed 19 is a place separated from the processed water supply portion 100 in the direction of distribution of processed water. <P>COPYRIGHT: (C)2013,JPO&INPIT |
