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Working principle of belt filter press

The belt filter press is a continuous solid liquid separation equipment, sludge is flocculating, low vacuum (gravity) dehydration, low pressure dehydration and high pressure dehydration, the mud cake is running to the discharge roller with the filter.Specific as follows: the sludge in the mixing agitator mixes with flocculation solution, into the slow rotating liner filter cloth roller predewatering, sludge by the rotating spiral guide plate effect through drum, in the process of flocculation release most of the water has been through the filter cloth to filtrate collection tank, at the same time, the filter cloth wash spray, in order to facilitate drainage and to ensure that the filter cloth is not blocked.At the end of the cylinder, the pre-dehydrated sludge slides down a chute and falls to the filter belt, which moves along the filter belt and enters the lower filter zone.Thus the sludge enters the dehydrated part of the strip mill.
1. Filtration and dehydration phase
The sludge is carried into the dehydration part of the strip mill.As the filter belt movement, the sludge into the upper and lower wedge area between two layers of filter belt, under the effect of two layers of filter with up and down slowly, make the sludge of small and medium-sized area of free water has also been gradually squeezed out.The sludge can successfully enter the squeezing zone.
2. Squeeze the dehydration stage
The squeeze dehydration area is composed of several rollers that are gradually decreasing in diameter.The roller is arranged to facilitate the smooth outflow of water.The sludge is repeatedly subjected to increasing pressure and shear in the squeeze dehydration area, so that the free water, interstitial water and pore water in the sludge can be squeezed out as far as possible.
The filtrate produced by the pre-dehydration drum is collected into the filtrate collection tank, which can be circulated to the flushing nozzle to flush the filter cloth.

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