Why Choose Membrane Filter Press for Dewatering in Starch Production

In the starch production process—from raw material crushing to the final product—the washing and dewatering stage serves not only as a critical juncture determining product quality but also as a key factor in controlling production costs. Faced with the industry's stringent requirements regarding starch purity, whiteness, and energy conservation, the membrane filter press has emerged as an indispensable asset in the starch refining process, thanks to its exceptional solid-liquid separation capabilities.

Advantages of Membrane Filter Presses in Starch Production Applications

1. Outstanding Washing Efficiency

The membrane filter press utilizes a closed filter chamber structure that facilitates multi-stage counter-current washing. This design ensures that the wash water flows thoroughly through the filter cake layer, effectively displacing impurities and achieving superior washing results. This is particularly beneficial for starches with high purity requirements and tightly bound impurities—such as potato starch and tapioca starch—where the membrane filter press effectively removes soluble proteins, ash, and other contaminants to guarantee the high quality of the final product.

2. Superior Dewatering Performance

In the starch dewatering phase, every 1% reduction in moisture content translates to a significant reduction in subsequent drying costs. Through a high-pressure secondary pressing stage (typically 1.2–1.5 MPa), the membrane filter press effectively squeezes out the moisture trapped between starch granules. This significantly lowers the moisture content of the filter cake, achieving a more thorough dewatering effect than traditional mechanical dewatering methods. Consequently, this not only enhances the dryness of the starch but also conserves substantial energy during the subsequent drying process, thereby lowering overall production costs.

3. High Adaptability

The membrane filter press exhibits a high tolerance for fluctuations in feed concentration and is capable of processing starch slurries with varying particle sizes and viscosities. For instance, it can efficiently handle fine-particle or high-viscosity slurries—such as the fine starch slurry remaining after corn germ separation or tapioca starch slurry—offering exceptional adaptability for the production of various types of starch.

4. Clear Filtrate

The use of high-quality filtration media ensures the clarity of the filtrate (process water). The resulting transparent and clear filtrate facilitates subsequent recycling or safe discharge. This not only enhances the environmental sustainability of the production process but also ensures compliance with environmental regulations.

5. High Degree of Automation

Through an automated PLC control system, the membrane filter press can automatically execute processes such as compaction, feeding, washing, squeezing, cake discharge, and filter cloth cleaning. This automated operation not only boosts production efficiency and reduces labor costs but also enhances the overall stability of the entire production line.

Key Factors for Optimizing the Performance of Membrane Filter Presses

1. Filter Cloth Selection

Given that starch particles are fine and vary in viscosity, the selection of the filter cloth is of paramount importance. It is essential to choose a filter cloth that features good air permeability, resistance to high temperatures and corrosion, easy cake release, and resistance to clogging—such as a monofilament filter cloth—to ensure effective filtration and the long-term stable operation of the machine. Furthermore, different types of starch and distinct stages of the production process may require specific models of filter cloth to ensure optimal filtration results.

2. Pressure Control

Feeding pressure and squeezing pressure are central to the efficient operation of a membrane filter press. Particularly when processing viscous cassava starch slurry or when production requirements demand a lower moisture content, applying sufficient pressure can effectively boost processing efficiency and ensure that the dryness of the filter cake reaches the desired state.

3. Maintenance and Upkeep

To ensure the long-term, stable operation of the membrane filter press, regular inspection and maintenance of the machine are crucial. Routine checks should be conducted to detect any damage to the filter cloth; additionally, the feed inlet should be cleaned, the hydraulic system kept clean, and moving parts lubricated on a regular basis. Such practices extend the service life of the machine, enhance production efficiency, and minimize the occurrence of machine malfunctions.

The membrane filter press plays an indispensable role in the starch production process. It not only improves the purity and whiteness of the starch but also effectively reduces energy consumption during dewatering and drying, thereby boosting the overall efficiency of the production line. With the continuous advancement of technology, the application of membrane filter presses in the field of starch refining is poised to become even more widespread and efficient.