| 摘要 |
PROBLEM TO BE SOLVED: To provide a sludge treatment method which enables the easy execution of pH adjustment using a component contained in sludge to dispense with a pH controller or to reduce its consumption, facilitates the adjustment to target pH, and is capable of more enhancing a malodor preventing effect than when the pH controller is used. SOLUTION: In the sludge treatment method for mixing primary sedimentation sludge 10 produced in a wastewater disposal plant or its concentrated sludge with excess sludge 9 or its concentrated sludge to subject them to dehydration treatment, the drawn primary sedimentation sludge from a first sedimentation basin is adjusted to an average SS concentration of 2 wt.% or above to be subjected to acid-putrefaction to be adjusted to a pH of 5.3 or below by a produced organic acid and a nitrite is added to the pH adjusted sludge to be mixed with excess sludge or its concentrated sludge or the nitrite is added to the mixed sludge. Then, the nitrite added sludge is subjected to dehydration treatment to prevent the occurrence of a malodor. COPYRIGHT: (C)2007,JPO&INPIT
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