WASTEWATER TREATMENT METHOD AND WASTEWATER TREATMENT SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a wastewater treatment system without enlarging the size of an anaerobic treatment tank so as to cause the reduction in performance of a filtration mechanism does not occur while eliminating the necessity of particular aerobically treating.

SOLUTION: The wastewater treatment system 1 includes: a solid-liquid separator 2 for separating the liquid portion and the solid portion from organic wastewater; a first anaerobic treatment tank 4 for carrying out anaerobic treatment of the liquid portion separated by the solid-liquid separator 2 to obtain processed water that has passed through a filter mechanism 3 from sludge; a second anaerobic treatment tank 5 for carrying out anaerobic treatment of the solid portion separated by the solid-liquid separator 2; and a sludge supply mechanism 6 for supplying the sludge in the second anaerobic treatment tank 5 to the first anaerobic treatment tank 4.

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