The role of the filter press in wastewater treatment

   In the entire process of sewage treatment, solid-liquid separation and sludge treatment are the key links to ensure that sewage is discharged up to standard and avoid secondary pollution. The filter press, with its highly efficient solid-liquid separation capacity, has become an indispensable device in the sewage treatment system. Its working principle is based on pressure drive, which enables the liquid in the sewage to pass through the filter medium and be discharged, while solid particles are retained, achieving sludge-water separation. This feature makes it play a core role in multiple links of sewage treatment.

I.Application Links of Filter Presses in Sewage Treatment

(1)the depth of the concentrated sludge dewatering wastewater after biological treatment and chemical treatment, can produce a large number of high moisture content of sludge. In the early stage of sludge treatment, the moisture content of the sludge is initially reduced through methods such as gravity concentration and air flotation concentration, but further deep dewatering is still required. At this point, the filter press comes into play, as it can significantly reduce the moisture content of sludge from over 90% to 60% - 80%. Take urban sewage treatment plants as an example. After the daily excess sludge is treated by a filter press, its volume can be reduced by 70% to 80%, which greatly lowers the subsequent sludge transportation and disposal costs. 

(2)industrial wastewater pretreatment in chemical, electroplating, printing and dyeing and other industries, the production process emissions of wastewater often contains a lot of suspended solids, colloid and heavy metal ions and other pollutants. As a pretreatment device, the filter press can quickly separate solid impurities from wastewater, reducing the load on subsequent biochemical treatment and advanced treatment. For instance, in electroplating wastewater, the filter press can effectively intercept the precipitation of heavy metal hydroxides, significantly reducing the suspended solids content in the wastewater and creating favorable conditions for subsequent advanced treatments such as ion exchange and reverse osmosis. 

(3)the water reuse link the guarantee of water reuse is the important way to realize recycling of water resources, and the filter press play a key role in the protection of water back to the water quality in. In the process of reclaimed water reuse treatment, the water that has undergone biological treatment and membrane treatment may still contain a small amount of tiny particles and colloidal substances. The filter press removes these impurities through fine filtration, ensuring that the turbidity, suspended solids and other indicators of the reclaimed water meet the reuse standards, thereby achieving the safe recycling and utilization of water resources.

II.Technological Innovation and Development Trends of Filter Presses in Wastewater Treatment

With the continuous improvement of sewage treatment requirements, the technology of filter presses is also constantly innovating. Intelligence has become an important development direction. By introducing sensors and automatic control systems, the filter press can monitor parameters such as filtration pressure, flow rate, and filter cake thickness in real time, and automatically adjust the operating parameters according to the nature of the sewage and treatment requirements to achieve precise control. Meanwhile, environmental protection and energy-saving technologies have also been widely applied in filter presses. For instance, new high-molecular filter cloths are adopted to enhance filtration efficiency and reduce energy consumption. Optimize the pressing process to reduce wastewater discharge during the sludge treatment process. In the future, filter presses will develop towards higher efficiency, lower energy consumption and greater intelligence, providing better solutions for the sewage treatment industry.