Combination method for improving sludge dewatering effect of membrane filter press

Abstract

The invention discloses a combination method for improving the sludge dewatering effect of a membrane filter press. The method comprises the following steps: a, laying a grid mat on the outer side surface of the flow guiding groove of each filter plate of the membrane filter press, wherein the mesh aperture of every grid mat is smaller than a spacing between two adjacent flow guiding projections on the outer side surface of every filter plate; and b, performing ventilation blowing on a filter cake in the filter press by adopting a blower after the squeezing in the membrane diaphragm filter press is finished, wherein the ventilation blowing is performed in a diagonal staggered blowing manner to make ventilating openings and water discharging openings at different sides work in a paired manner. The grid mats arranged in the invention prevent a filter cloth from being embedded in a filter frame and forming a concave-convex surface due to long-time compression, so the flatness of the surface of the filter cloth is ensured, and the smoothness of a water discharging channel in the filter frame is also ensured, thereby water squeezed from sludge is rapidly discharged, and the sludge-waterseparation speed is fast; and the operating step of ventilation blowing using the blower is added in the invention, so capillary water which cannot be easily removed only through pressure increase iscarried away, thereby the water content of the sludge is further reduced, and the dewatering effect is improved.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a combined method for improving the sludge dewatering effect of a diaphragm filter press. Background technique [0002] Sludge dewatering is an important link to achieve the goals of sludge stabilization, reduction, and harmless treatment. According to the requirements of national standards and standards, the moisture content of sludge for mixed landfill treatment is required to be less than 60%; and the moisture content of sludge for soil improvement, landscaping, agricultural and building materials and other resource utilization is even lower. Therefore, minimizing the moisture content of sludge is one of the important indicators for testing the effect of sludge treatment, and it is also the basis for sludge resource utilization. [0003] Sludge dewatering methods include natural drying dehydration, thermal drying dehydration and mechanical dehydration, among which th...

AI Technical Summary

Problems solved by technology

Most of the water removed by the plate and frame during the pressing process belongs to void water, and the capillary water that accounts for a large proportion is difficult to remove during the pressing process, or only a small part can be removed when the pressure is increased to a large level. In order to further reduce sludge It is necessary to remove the capillary water in the sludge, but at present, it is difficult to remove it simply by increasing the pressure of the filter press, or even if it is removed, it will require a high cost

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