TREATING APPARATUS AND TREATING METHOD FOR OIL AND FAT-CONTAINING WASTEWATER

摘要

PROBLEM TO BE SOLVED: To provide a treating apparatus and a treating method for oil and fat-containing wastewater, by which the wastewater containing high concentration of oils and fats is treated by oil and fat-decomposing bacteria, a small quantity of excess sludge is produced and clear treated water can be obtained.

SOLUTION: The treating apparatus for oil and fat-containing wastewater is constituted of at least an oil and fat decomposing tank for decomposing the oils and fats in the wastewater by action of the oil and fat-decomposing bacteria, a biological treatment tank and a solid-liquid separation tank which are arranged in series in a direction from an upstream side to a downstream side. Further a fixed carrier is provided or a fluidizing carrier is floated in the oil and fat-decomposing tank and a return means for returning sludge in the solid-liquid separation tank to the biological treatment tank is provided.

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