Belt filter press is a type of sludge dewatering equipment with high processing capacity, high dewatering efficiency, and long service life. As a supporting equipment for sewage treatment, it can filter and dehydrate suspended solids and sediment after air flotation treatment, and press them into mud cakes to achieve the purpose of preventing secondary pollution. The machine can also be used for process treatment such as slurry concentration and black liquor extraction。
Working principle
The dehydration process of the belt filter press can be divided into four important stages: pre-treatment, gravity dehydration, wedge zone pre pressure dehydration, and press dehydration. During the pre-treatment stage, the flocculated material is gradually added to the filter belt, causing free water outside the flocs to separate from the flocs under gravity, gradually reducing the water content of the sludge flocs and reducing their fluidity. Therefore, the dehydration efficiency of the gravity dehydration section depends on the properties of the filtering medium (filter belt), the properties of the sludge, and the degree of flocculation of the sludge. The gravity dewatering section removes a significant portion of water from the sludge. During the wedge shaped pre pressure dehydration stage, after the sludge is subjected to gravity dehydration, its fluidity significantly decreases, but it is still difficult to meet the requirements for sludge fluidity in the pressing dehydration section. Therefore, a wedge shaped pre pressure dehydration section is added between the pressing dehydration section and the gravity dehydration section of the sludge. The sludge is slightly squeezed and dehydrated in this section, removing free water on its surface, and the fluidity is almost completely lost, This ensures that the sludge will not be squeezed out in the press dehydration section under normal circumstances, creating conditions for smooth press dehydration.
Application scope
Belt filter press is suitable for sludge dewatering treatment in industries such as urban domestic sewage, textile printing and dyeing, electroplating, papermaking, leather, brewing, food processing, coal washing, petrochemical, chemical, metallurgical, pharmaceutical, ceramic, etc. It is also suitable for solid separation or liquid leaching processes in industrial production.
Post time: Nov-01-2023