| 摘要 |
PROBLEM TO BE SOLVED: To provide a sludge treatment system where concentrated sludge obtained by concentrating digestive sludge using a concentrator is returned to a digestion tank to increase the treatment efficiency of sludge, the mass of suspensions in the waste water to be exhausted is reduced, and further, the using amount of a chemicals is reduced to reduce a driving cost.SOLUTION: Provided is a sludge treatment system comprising: a digestion tank of subjecting sludge to digestion treatment; a flocculant addition means of adding a flocculant to a part of digestive sludge exhausted from the digestion tank; a concentration machine of concentrating a part of the digestive sludge added with the flocculant so as to be separated into concentrated sludge and a concentrated separation liquid; a return line of returning the concentrated sludge into the digestion tank; a mixing means of mixing the balance of the digestive sludge exhausted from the digestion tank with at least a part of the concentrated separation liquid; and a dehydrator of dehydrating the mixture obtained by the mixing means so as to be separated into dehydrated sludge and a dehydrated separation liquid.SELECTED DRAWING: Figure 1 |
