Filter presses are a versatile piece of equipment used across various industries, but they are particularly important in sludge dewatering applications. When selecting a filter press for this purpose, several factors come into play, and the significance of each can vary based on the specific application.
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Key considerations include the frame size and the number of plates, which directly impact the filtration area and cake capacity. In general, a larger frame size allows for a higher flow rate, while a greater number of plates means the filter press can hold more solids before requiring cleaning. Since filter presses operate in batches, each batch corresponds to a specific volume of dewatered "cake," often referred to as "cake capacity" or "cake volume." The number of batches a filter press can process daily depends on factors such as the capacity of the sludge feeding pump and the operational hours dedicated to sludge dewatering.
Flexibility in the system allows for adjustments. For example, opting for a smaller filter press can be viable if you're willing to invest in a higher-capacity sludge feeding pump and dedicate more operator time to the process. However, it's important to note that time is needed to open, clean, and re-clamp the press between batches, which limits the number of cycles that can be completed in a day.
When customers request a filter press for sludge dewatering based on a specific flow rate, it's essential to emphasize that, unlike process filtration, sludge dewatering is more concerned with the quantity and characteristics of the solids in the slurry. The nature of these solids, along with the treatment process, will determine the dryness of the dewatered cake. For example, achieving 65-70% dryness is achievable for metal hydroxides in metal finishing wastewater and ceramic industry wastewater, while biological wastes typically reach only 35-40% dryness.
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To estimate the daily volume of dewatered cake to expect from your system, divide the expected amount of dry solids generated by your application by the anticipated dryness percentage. Since filter presses work in batches, dividing this value by the number of batches you plan to run each day will give you the required filter press size for your application.
If you're looking to minimize the size of the filter press and reduce the initial investment, consider using a volumetric positive-displacement sludge feeding pump. This approach increases the number of batches that can be processed daily, allowing for a smaller filter press. However, it's important to weigh the additional costs of the pump and labor against the benefits before making a decision.
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