With the growth of urban population, the continuous improvement of municipal service facilities, the innovation of sewage treatment technology and the deepening of treatment, the amount of sludge produced in the sewage treatment process will also increase greatly, and sludge dehydration and reduction are inevitable. OK, as a commonly used external treatment equipment, plate and frame
Filter Press has broad development prospects.
The selection of
Filter Cloth for plate and frame filter press is very important. It needs to comprehensively consider many factors such as filtrate, mud cake moisture content, usage cost, etc. After summarizing the characteristics of urban sewage treatment sludge and the characteristics of the treatment process, we selected Two commonly used filter cloths were tested
Research results show that polyester monofilament twill filter cloth can obtain a lower moisture content, but its filtrate is turbid and the recovery rate of sludge dewatering is low, while polypropylene multifilament long fiber twill filter cloth has a higher moisture content, but its filtrate is turbid and the recovery rate of sludge dewatering is low. The liquid recovery rate is good. Each sewage treatment plant can choose the appropriate filter cloth according to its own situation to achieve the purpose of reducing the water mixing rate and improving usage efficiency.
The operation process of the filter press in sludge water treatment mainly includes five steps: feed filtration, secondary pressing, air blowing, cake unloading, and filter cloth washing.
When the "Material Crossing the Shore" step is started, the piston rod of the liquid cylinder and the pressing plate move the Filter Plate towards the thrust plate and press it tightly, forming a series of sealed filter chambers between the filter plates. The PAM distribution system is running, and in front of the feed pump Note
medicine, the feed pump starts, and the mud is sent into each flow chamber through the center hole of the thrust plate. With the pressure of the feed pump, the mud passes through the back of the filter cloth and enters the drainage ditch and drainage hole drainage system on the filter plate, and the solid matter is trapped A mud cake gradually forms in the filter cavity.
The "feeding and filtering" step ends, the injection of medicine is stopped, and the "secondary pressing" step is entered. The filter plate diaphragm expands and squeezes to dehydrate the mud cake for the second time. The "secondary pressing" is completed and the "air blowing" step is entered. Leli air is introduced into the filter cavity through the drainage channel in the upper right corner of the filter plate and discharged through the drainage hole at the bottom of the plate, taking away some free water on the surface of the filter cake. The "secondary blowing" step ends and enters the "sludge unloading" step. The piston rod of the hydraulic cylinder drives the pressing plate to move back to release the filter plate. The manipulator pulls the filter plate piece by piece to unload the cake. After the cake unloading is completed, flushing is started depending on the situation. filter cloth program or enter the second filter press operation cycle.
Contact Now
