Sludge has been a difficult problem in the field of environmental protection. Its water distribution pattern mainly includes interstitial water, capillary water, adsorbed water and bound water, and the binding strength gradually increases. As the gelatinous particles in sludge have strong affinity to water, the sludge has high water content and it is difficult to leave the sludge with water by physical methods.
Therefore, sludge dewatering machine becomes a suitable choice to solve this problem. Sludge dewatering process can be divided into three categories according to the principle: vacuum filtration dewatering, filter press dewatering and centrifugal dewatering, and the main equipment includes belt filter press, plate and frame filter press, centrifugal dewatering machine and stacked screw dewatering machine.
What is the difference between a stacked screw machine and a plate and frame, belt and centrifugal dewatering machine?
Due to the simultaneous completion of sludge thickening and filter press dewatering, the stacked-screw dewatering machine is more efficient than the traditional filter cloth filtration and centrifugal filtration methods, and it has a small footprint, low noise, less rinsing water and excellent workshop environment.
Plate and frame filter press has the advantages of strong adaptability of sludge concentration, high solid rate of sludge and low amount of flocculant. However, it also has problems such as large floor space, intermittent operation and low efficiency.
Belt filter press into its desliming effect is not affected by the mud load, but there are problems such as filter cloth clogging, filter belt skewing and so on.
Centrifugal dewatering machine can realize continuous dewatering treatment, high solid phase rate of sludge, large sludge production, but high power consumption and noise. In general, stacked-screw dewatering machine is a kind of energy-saving, water-saving and high-efficiency sludge dewatering equipment, which is especially suitable for oil-containing sludge after pressurized treatment in food processing plants.
Under the same sludge treatment capacity, the stacked screw dewatering machine is 85% more energy efficient than the centrifugal dewatering machine, occupies only half the area of the centrifugal dewatering machine, and saves 95% of water for surface cleaning.
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