Centrifugal solid-liquid separation device and water treatment device using same

When a plurality of cyclones is used as a separation device for a water treatment device, the number of lower liquid containers is the same as the number of cyclones, thus resulting in high costs. Provided is a centrifugal solid-liquid separation device that is characterized by comprising: a plurality of cyclones that each comprise a liquid inlet, a liquid outlet, and a lower liquid port; and a lower liquid container that is connected with each of the lower liquid ports of the plurality of cyclones via a pipe, that is arranged below the plurality of cyclones, and that comprises a drain hole on the bottom side thereof. The centrifugal solid-liquid separation device is further characterized by the lower liquid container comprising a space formation section that is more toward the upper side than the lower opening end of the pipe. 在作为水处理装置的分离装置而使用多个旋液分离器的情况下，存在与旋液分离器的数量相同的下液容器，成本高。提供种离心式固液分离装置以及使用该离心式固液分离装置的水处理装置，该离心式固液分离装置的特征在于，具有：多个旋液分离器，各旋液分离器具有液体入口、液体出口以及下液口；以及下液容器，其经由配管而与所述多个旋液分离器的各下液口连通，配置于所述多个旋液分离器的下方，在底侧