We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Filter Press?

By Paul Scott
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A filter press is a device that uses a combination of permeable membrane filter elements and pressure to remove fluids from slurries. This process typically entails filling a multi-chambered press with slurry and reducing the internal chamber volumes by applying pressure. This process forces the fluids to exit via the permeable membrane, thus leaving a semi-moist cake of solids in the press. The filter press may be used to recover desirable solids from transport suspensions or to remove undesirable solids from water filtration processes. Filter presses are commonly used in the manufacture of food stuffs and pharmaceuticals and in chemical and water treatment plants.

Many manufacturing and purification processes require solids and their fluid carriers which make up slurry suspensions to be separated. For example, food and pharmaceutical production lines have to remove valuable powder or granular end products from the water which transports them through the production process. Water treatment plants, on the other hand, have to remove undesirable contaminant solids to begin the process of rehabilitating waste water. The filter press is one of the filtering methods which can deal with the speeds and quantities of slurry involved in these processes. These filters are also some of the most efficient and cost effective systems due to the low number of moving parts and system steps involved.

Filter presses generally consist of a series of chambers formed by hollow plate baffles. The surfaces of the baffles are lined with a filtration medium, typically a filter cloth membrane. When the press is open and empty, the gaps or chambers between the plates are fairly large. To start the filtration process, all chambers are pumped full of slurry. Once this step is complete, a hydraulic or electrically powered ram presses the plates together; it then compresses the slurry filled chambers and squeezes liquid out of the slurry through the filter membranes and into the plates' interior spaces. Interconnected filtrate ducts built into each plate then drain the liquid.

When the compression cycle is complete, the press is reopened and the plates are sequentially withdrawn. The filtered solids cake drops out and is collected for later use or disposal and the cycle is started again. After a predetermined number of filter cycles, the plate filters are washed to remove accumulated sludge. The filter press is suitable for a wide range of slurry types including organic and inorganic hydrophilic slurry, inorganic hydrophobic slurry, and oil based slurries. The filter press process is simple and not labor intensive; some filter membrane conditioning is necessary to prevent excessive sludge adherence with certain types of suspensions such as hydrophilic slurries, however.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.