Model KD 30 - Drum Thickener
From Sludge Treatment
The drum thickener Model KD 30 is a thoroughly tested machine designed to ensure low service and maintenance costs. Drum thickener model KD 30 is used for thickening of effluent sludge. A concentration from 0.8% dry solids to approximately 6% dry solids is normally achieved when dewatering municipal biological excess sludge. The drum thickener is especially suited for further treatment of sludge in e.g. sludge digesters or similar as it is possible to place an eccentric worm pump directly under the sludge discharge.
The drum thickener is designed as a closed unit in which one or two drums are placed. The drum is equipped with polyester filter cloth or similar. The drum is equipped with internal twisted guide/bump plates.
A flushing bar is placed over the drum and flushing is performed continuously during operation and during final cleaning. The flushing bar can be easily dismounted and is equipped with a number of click-on nozzles facilitating cleaning.
The drum thickener has inspection doors – one on each side and one at the sludge outlet. The latter is equipped with a window for easy inspection of the dewatering process.
The entire machine is made of stainless steel, which has been dip-pickled after manufacturing, thus ensuring optimum resistance against corrosion.
Method of operation
Dewatering is performed by adding a polymer to the sludge which is then carried to the bottom of the rotating drum (gear end). The drained water is then gravitated through the filter cloth and the up-concentrated sludge is carried to the sludge discharge.
The direction of rotation can be changed according to the requirements. During normal operation the sludge is screwed towards the sludge inlet end of the drum. In this way the interior drum bumps ensure a long retention time.
During cleaning of the filter cloth the sludge is screwed outwards to the sludge discharge.
When cleaning the filter cloth all impurities are led to the sludge discharge. Flushing water is carried towards the drum bottom in order not to influence the dewatering process.
The drum thickener is equipped with motor valve, pressure control and level electrode in discharge hopper.
The control unit, which is enclosed in a separate steel cabinet, contains logic module, frequency regulation of gear motor, contactors, protective motor switches, etc.
The control unit is designed to control the internal functions, working time, cleaning time, etc. of drum thickener as well as the necessary signals for external equipment such as sludge pump, polymer unit, etc.
The control unit can be placed according to convenience as the drum thickener is equipped with a junction box.
The drum thickener can be supplied in other materials and designs according to customer requirements.