| 摘要 |
PURPOSE:To suppress the increase in liquid temp. by discharging part of the sludge in an anaerobic digestion tank to the outside of the system according to the degree of increase in the liquid temp. while monitoring the liquid temp. in a biological treatment process including nitrification and denitrification. CONSTITUTION:Part 16 of the sludge in the anaerobic digestion treatment tank 13 for org. sewage is discharged to the outside of the system according to the degree of increase of the liquid temp. while the liquid temp. in the biological treatment state is monitored in a treatment method for the org. sewage in which the anaerobic digestion process in the tank 13 and the biological treatment process including the nitrification and denitrification in the digestion tank 1 and denitrification tanks 3, 6 are operated by being cyclically combined. The control of the increase in the liquid temp. is thus made possible.
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