Filter presses are widely used in various industries such as chemical processing, mining, and wastewater treatment for solid-liquid liquid-solid separation. The filtration process in these presses is dependent on several factors including filter medium properties, and most importantly, pressure applied to the filter cake.

Studies have shown that the overall filtration rate in filter presses can significantly be influenced by the operating pressure within the filter chamber. Pressure is applied on the filter cake to facilitate the effective separation of liquids from solids. As a result, the filtration rate improves. This is because higher pressures result in enhanced liquid passage, which in turn allows for the efficient passage of fluid through the filter medium.

One particular study analyzed the effect of pressure on filtration rates in ceramic filters used for the separation of inorganic solid-liquid mixtures. According to the findings, pressure increases were associated with higher rates. Whereas lower pressures resulted in lower rates. This confirms that pressure plays a vital role in determining the effectiveness of filter presses.

In general, the relationship between pressure and filtration rate can be described as follows: as the pressure rises within the filter chamber, so does the filtration rate in harmony with it. This is attributed to several factors including enhanced liquid flow through the filter. Conversely, decreasing pressure beyond a critical point is associated with lower rates due to reduced cake permeability.

However, research also indicates that there exists a critical pressure value beyond which the rate of increase in liquid passage starts to decrease. This suggests that extremely high pressures could potentially cause structural damage to the filter medium or the underlying filter plate, thus leading to decreased filtration rate. Therefore, careful optimization of operating pressure is crucial for achieving optimal filtration rates without compromising the performance of the filter press.

Ultimately, a combination of high pressure and effective filter medium design is necessary to obtain the maximum filtration rates in filter press plate and frame presses. This can be achieved by understanding the complex relationship between pressure and filtration rate, as well as optimizing operational conditions to obtain optimal performance from these key components.