Central Driven Sludge Thickener is apt for placement in reinforced cement concrete or mild steel tanks. The Sludge Thickener is provided with arrangement for efficient compaction of sludge. The Sludge Thickener is a central driven unit and the drive torque arms are connected to a slewed push rod onto a load cell which provides constant torque load output. Central Driven Sludge Thickener can be provided with suitable cone scrapper to suit specific requirement.