Since the belt filter press is the main stream of sludge dewatering in the sewage treatment plant, the strength of the centrifuge is mainly based on the comparison with the belt filter press. The filter press has the following advantages:

1 The horizontal screw centrifuge uses the principle of centrifugal sedimentation to make the solid and liquid separate, because there is a strainer, it will not cause blockage, and the belt filter press uses The filter belt separates the solid and liquid. In order to avoid the clogging of the filter belt, high pressure water is required to be continuously washed.

2The centrifuge is suitable for concentration and dewatering of various sludges, and the belt filter press is also suitable for various types of sludge. However, it is necessary to apply a large amount of activated sludge and dehydration;

3 When the concentration of the feed changes during the dehydration process, the slip and the torque of the drum and the screw will be automatically adjusted. Therefore, there is no need for special personnel to operate, and when the filter concentration changes during the dehydration process, the belt speed, the tension of the belt, the dosing amount and the flushing water pressure need to be adjusted, and the operation requirements are required. High;

4 In the centrifuge, the fine sludge can also be separated from the water, so the dosage of the flocculant is less. Generally, the dosage of the mixed sludge is 1.2kg/ t[dry mud], the sludge recovery rate is above 95%, and the moisture content of the mud cake after dewatering is about 65%-75%, and the filter belt cannot be woven too densely because of the filter belt, in order to avoid the fine sludge slippage. More flocculant should be added to make the sludge constitute a larger floc. Generally, the dosing amount of the mixed sludge is more than 3kg/L [dry mud], and the sludge recovery rate is about 90%. The moisture content of the cake is about 80%;

The dewatering power per cubic meter of sludge in a 5 decanter centrifuge is 1.2kw/m3, and the noise during operation is 76-80db, which is continuously operated 24 hours a day. There is no need to wash water during operation; the belt filter press consumes 0.8kw/m3 per cubic meter of sludge dewatering, and the noise is 70-75db during operation. The filter cloth needs to be relaxed and maintained. Generally, only two shifts are arranged every day. The filter cloth should be continuously washed with high-pressure water during the operation;

6 horizontal screw centrifuge takes up little space, simple installation and commissioning, and only the supporting equipment Medicine and feeding conveyor, the whole machine is fully sealed and the workshop environment is good; while the belt filter press has a large area, and the supporting equipment needs to flush the pump, air compressor, and dirt in addition to the dosing and feeding conveyor. Mud dispatcher, etc., the whole machine is poorly sealed, high-pressure cleaning water mist and odor pollute the environment, if the management is not good, it will form mud overflow;

7 horizontal screw centrifuge wearing parts are bearings and The maintenance period of the sealing member and the discharge screw is generally above 3a; while the wearing parts of the belt filter press are replaced by bearings and seals, the filter belt also needs to be replaced, which is expensive.