Double flow segmented settling tank

A double-flow segmented settling tank comprising a succession of inclined plates defining at least one parallel flow stream, flowing in a first flow direction, and at least one counter-flow stream flowing in a second flow direction opposite to said first flow direction, said parallel flow and counter-flow streams being connected in series between an inlet and an outlet of the settling tank so as to form means to allow particles contained in an input fluid flowing continuously into the inlet to deposit a sediment under gravity onto one of said plates, the particles settling parallel to fluid flow in said parallel flow stream and counter to fluid flow in said counter flow stream, the settling tank also comprising a collecting volume to receive said sediment continuously after it has slid under gravity to an edge of said one plate and has escaped from it, wherein said inlet is connected to said counter-flow stream, and said parallel flow stream is connected to said outlet, so that said sediment is deposited on said one plate and is received in said collecting volume from each of said two streams.