Membrane pump flow: According to the volume of the board and frame filter chamber, the moisture content of the dewatered sludge, the concentration of the sludge into the front of the plate frame, the amount of sludge required to complete the dehydration operation of the plate frame is converted. Then, determine a reasonable feed-in time, for example 2-3 hours. Calculate the flow. Diaphragm pump material: such as ordinary biological sludge, the choice of ordinary polypropylene material, more economical. Other special sludge, according to the specific sludge composition, the choice of diaphragm material. Need to pay attention to the design of the matter: 1, the intake pipe to install pressure-relief valves and small ball valve, easy to check and adjust the diaphragm pump flow and pressure; 2, began to dehydration, the air pressure should be controlled at 2-3bar , When the effluent flow significantly reduced, and then increase the air pressure, will get better dehydration effect; 3, the quality of sludge quenching effect, plays a decisive role; The disadvantages of diaphragm pumps: 1, the pressure can not be increased , Is limited by the air pressure, 7bar to the upper limit; 2, noise and pipeline vibration, especially in the air volume; 3, relative to the screw pump, diaphragm life is short, easy to damage; 4, Usually not too large, most applications in small systems; Advantages of diaphragm pumps: 1, low investment, screw pumps need to be able to adjust the flow device, frequency or pressure regulator valve, but also the need for supporting the pressure sensor; 2, reliable work , Simple, can automatically balance the flow as the filter resistance increases; 3, small footprint, easy to install. 4, low cost, economical and practical