DOMESTIC WASTE WATER TREATING SYSTEM AND ITS OPERATING METHOD

PROBLEM TO BE SOLVED: To carry out quickly accurately biological treatment by a method wherein in that which is equipped with a grind part grinding garbage, a solid-liquid separation part separating the ground garbage into solid and liquid, and a biological treating part in which the treated waste water is biologically degradation treated, precision in solid-liquid separation with the solid-liquid separation part is specified. SOLUTION: A disposer 1 is set in each home. Disposer waste-water is introduced to a slid-liquid separator 4 via a trap 2. Thereafter, solid components recovered from the disposer waste water are successively transferred to a solid component treating device 5, and a disposer waste water treating device 7. The solid-liquid separator 4 is a device in which SS component and BOD component in the disposer 1 are efficiently removed, and separating precision in solid-liquid separation is made to be 1.0mm or over and up to including 3.35mm by being compared with characteristics of particle size distribution of disposer waste water and BOD distribution. For the solid component treating device 5, biological treatment and physical treatment are used. The waste water treating device is a biological treating bath, and its inside is composed of a filter bed 14 and an air diffusion pipe feeding air.