Lackeby ConThick is a centre-driven thickener designed for installation in a sludge or fibre thickener.

Benefits OF ConThick

• Competitive investment cost
• Good references and operating experiences
• Reliable
• Low operating costs


ConThick is Lackebys Centre driven thickener which reduces the water content in the sludge. Normal levels after the thickening is 2-3 times reduction in the volume or corresponding increase in the TS content in the sludge. Normal TS content after thickening is approximately 6-8% for primary sludge and 2-3% for biological sludge.


The basic principle of ConThick thickener is that the vertical scraper arms compresses the sludge. The water is squeezed from the sludge and moves upwards.

The scraper moves the sludge to the centre of the thickener from where it is removed for further treatment.

The separated water passes an outlet channel installed in the periphery of the tank and is transported from there to the entrance of the plant for further treatment.

ConThick can be operated continuously or intermittently and the overload protection as well as the drive is installed in a hold-circuit to stop the motor when overloaded. A signal can be installed to provide a signal to the electrical cabinets or control unit.


ConThick is designed with a gear box transmission, a vertical pipe shaft and supporting brackets for the thickening arms and the scraper blades. The shape and design of the shaft, the brackets and the scraper blades are designed to provide as high solids as possible.

The drive is equipped with a bearing designed for the total load. The drive is also equipped with a fast-acting overload protection with a limit switch which cuts off in case of over load.

In most cases, the shaft is provided with a supporting bearing in the bottom of the tank. The selected bridge can be constructed of steel or concrete. A damping cylinder is located at the inlet in the centre of the tank in order to equalize the flow and an outlet channel is installed in the periphery of the tank so that the final effluent is evenly distributed.