THICKENER, SLURRY TREATMENT SYSTEM, WASTEWATER TREATMENT SYSTEM, AND THICKENER CONTROL METHOD

To provide a thickener which can be stably operated even when slurry such as muddy water is to be treated.SOLUTION: A thickener comprises: a settling tank in which dispersion elements in slurry are settled, and a supernatant portion and a concentration portion are formed; an extraction line for extracting at least some part of the concentration portion from the settling tank; a measurement part which is disposed on the extraction line, and measures the concentration of the suspended substance of the concentration portion flowing in the extraction line; a returning line which is connected to the extraction line, and returns the concentration portion flowing in the extraction line to the settling tank; a discharge line which is connected to the extraction line, and discharges the concentration portion flowing in the extraction line to the outside; and a switch part which is connected to the extraction line, the returning line, and the discharge line, and switches passages of the concentration part between the returning line and the discharge line.SELECTED DRAWING: Figure 1 【課題】濁水等のスラリーを対象とした場合であっても安定して運転が可能なシックナーを提供すること。【解決手段】 本開示の一側面は、スラリー中の分散体を沈降させ上澄み部と濃縮部とを形成する沈殿槽と、上記濃縮部の少なくとも一部を上記沈殿槽から抜き出す抜出ラインと、上記抜出ライン上に設けられ、上記抜出ライン内を流れる上記濃縮部の懸濁物質濃度を測定する測定部と、上記抜出ラインに接続され、上記抜出ライン内を流れる上記濃縮部を上記沈殿槽に戻す返送ラインと、上記抜出ラインに接続され、上記抜出ライン内を流れる上記濃縮部を外部に排出する排出ラインと、上記抜出ライン、上記返送ライン及び上記排出ラインに接続され、上記濃縮部の流路を上記返送ライン及び上記排出ラインの間で切り替える切り替え部と、を備える、シックナーを提供する。【選択図】図１