Pressure filtration and centrifugal dewatering methods commonly used in plate and frame filter presses
Belonging category： Company Blog
Belonging category： Industry Blog
Release time：2024-06-19
Before using the plate and frame filter press, please carefully check whether the joints are firm and whether the components are in good working condition. If any abnormality is found, the maintenance personnel shall be notified in time for maintenance. If it is not used for a long time, please clean and dry the filter cloth and filter plate. The module must be disconnected from the power supply. Check the bearing and piston rod parts, keep the parts clean and have good lubrication performance to ensure the flexibility of the parts. Insulation and reliability testing of electronic control systems. If any abnormality is found, please repair or replace the electrical components in time. Before pressing, please check the filter cloth carefully to ensure that it is not folded or damaged to ensure a good filtering effect. The plate and frame filter press is a filter that combines multiple filter plates and filter frames to form a filter chamber and uses pressure as the driving force of the filter. The filter press operates intermittently.
The filter plate has stable performance, convenient operation, safety and labor saving. Metal and plastic steel filter plates are accurately cast, resistant to high temperature, high pressure and durable. In the process of using the plate and frame filter press, since the filter press itself has the same specifications, different filtering accuracy and speed required by different filtering objects can be achieved by using different filter presses. The frame filter bag allows each filter plate to be wrapped with filter cloth.
For the requirements of different filter objects, such as acid and alkali resistance, tensile strength, filtration accuracy, filtration speed, etc., the use method must be determined first. The material and model of the filter cloth can be placed on the filter cloth according to the size, shape and processing of the filter bag. Therefore, the filter cloth is the heart of the filter element and also on the filter press.
Plate and frame filter presses are commonly used in pressure filtration and centrifugal dewatering methods. Plate and frame filter press has been developed at home and abroad, compared with vacuum filter, plate and frame filter press can withstand higher sludge specific resistance, which can reduce the consumption of regulator and can use cheaper reagents. When the specific resistance of the sludge is 5 × 10~8 × 10 m/kg, it can be directly filtered without prior adjustment. The cake yield and cake moisture content of the plate and frame filter press shall be determined based on test data or similar operating experience. The moisture content of the mud cake may typically be 75% to 80%.
The filtration and dewatering of sludge is based on the pressure difference between the two sides of the filter medium. Therefore, the moisture of the sludge is forced to pass through the filter medium to form a filtrate, and the solid particles are trapped on the medium to form a filter cake, so as to achieve the purpose of sludge dewatering. Plate-and-frame filter presses are machines used for chemical dewatering, and although plate-and-frame filter presses are usually operated intermittently, with large infrastructure investment and low filtration capacity, they have large filtration driving force, high cake solids content, clear filtrate, high solids recovery, and drug conditioning. Consumption is still widely used in some small sewage treatment plants.
Key word： Pressure filtration and centrifugal dewatering methods commonly used in plate and frame filter presses