Abstract: A waste separating system includes: a first waste separating apparatus 4 and a second waste separating apparatus 5 each configured to separate waste S from treatment target water W1, the first waste separating apparatus 4 including a first filter 41 with a first opening size, the second waste separating apparatus 5 including a second filter 51 with a second opening size larger than the first opening size and disposed downstream of the first waste separating apparatus 4.

Abstract: An organic wastewater treatment apparatus comprises a biological treatment tank provided with a whole floor aeration section in which a first aerator is disposed so as to perform whole floor aeration, a solid-liquid separation section formed above the whole floor aeration section and provided with a membrane separation device immersed in activated sludge, and a flow path narrowing section formed between the whole floor aeration section and the solid-liquid separation section so as to vertically separate the whole floor aeration section and the solid-liquid separation section, wherein the flow path narrowing section includes a flow path narrowing device configured to narrow a cross-sectional area of the flow path from the whole floor aeration section to the solid-liquid separation section so as to combine fine air bubbles discharged from the first aeration device to each other and discharge the combined bubbles to an area below the membrane separation device.